Re: unable to select submenu item
On Nov 18, 2009, at 3:45 PM, SRD wrote:
- (IBAction) readMenuSelection:(id) sender
{
NSMenu *projectMenu = [sender menu];
NSLog(@projectMenu = %@, projectMenu);
NSMenuItem *menuItem = [sender selectedItem];
NSLog(@menuItem %@, menuItem);
NSLog(@hasSubMenu %d, [menuItem hasSubmenu]);
NSMenu *subMenu = [menuItem submenu];
NSLog(@submenu %@, subMenu);
// output below when selecting an item within the submenu.
2009-11-18 16:29:46.614 test[4968:a0f] projectMenu = NSMenu: 0x100369be0
Title: ProjectMenu
Supermenu: 0x0 (None), autoenable: NO
Items: (
NSMenuItem: 0x100369a80 ,
NSMenuItem: 0x100369d30 Create, submenu: 0x100369c20 (Create),
NSMenuItem: 0x100318200 Load,
NSMenuItem: 0x1003603c0 ,
NSMenuItem: 0x10036a570 Save,
NSMenuItem: 0x10036ab70 Save As ...
)
2009-11-18 16:29:46.615 test[4968:a0f] menuItem NSMenuItem: 0x100318200 Load
Here your code indicates that the Load menu item was selected, and according
to everything you show, Load does *not* have a submenu, so everything is
working as expected, unless you aren't selecting Load, in which case your
problem isn't the same as you describe.
2009-11-18 16:29:46.616 test[4968:a0f] hasSubMenu 0
2009-11-18 16:29:46.617 test[4968:a0f] submenu (null)
My Menu is structured as follows:
NSPopUpButton
|- Create (NSMenu) - TestItem (NSMenuItem)
|- Load (NSMenuItem)
|- Save (NSMenuItem)
`- Save As (NSMenuItem)
Keary Suska
Esoteritech, Inc.
Demystifying technology for your home or business
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Re: NSUndoManager and runModalForWindow: (again)
On Nov 16, 2009, at 10:34 AM, Kevin wrote: I searched the archives on this issue and found several posts with the same question with zero responses. Is NSUndoManager simply not supported in a modal window? Can one of the Apple engineers confirm this? Here's a recap of the problem I'm running into: I have a simple Core Data app which displays a list of entities in the main window. To create or add new entities, I use a second modal window with a separate managed object context (a scratchpad) so changes can be undone/redone without interfering with the main managed object context. The editing window is launched using runModalForWindow:. If I make a series of discrete changes in this modal window, doing a single undo results in undoing ALL my changes. Setting the run loop modes of NSUndoManager (obtained from the second managed object context) to contain NSModalPanelRunLoopMode doesn't appear to make any difference. If I don't launch the window using runModalForWindow: and simply use makeKeyAndOrderFront:, everything works as expected. Are you sure that you know which NSUndoManager is being called? When not using a modal session it is possible that the API simply does the right thing, or appears to under certain circumstances. There may be a combination of issues involved. My advice would be to make sure that when your modal session is active that the undo actions will always use the temporary MOC's undo manager. Best, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSTableView Always Undesirably Selects First Row when It Loses Key Focus
On Oct 23, 2009, at 5:46 PM, Grant Erickson wrote: On 10/23/09 4:38 PM, Kyle Sluder wrote: On Fri, Oct 23, 2009 at 4:31 PM, Grant Erickson erick...@umn.edu wrote: Unlike the Network table, in my case there is no mandate that an item (i.e. row) always be selected. However, if there are no rows selected, when I hit the tab key to change the key focus from my table to the preferences search field, the table automatically, yet undesirably, selects the first row. Have you bound the table view to an array controller with avoids empty selection set? No, there are no associated controller objects or bindings for the table. Does your table allow empty selections? HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Bindings, am I doing right by MVC?
On Oct 23, 2009, at 11:52 AM, Paul Bruneau wrote: But I wonder about my edit fields. They are bound like: Bind to: File's owner (a NSWindowController subclass) Controller Key: blank Model Key Path: door.backset (door is an ivar of the window controller--it's the door that the window controller is for. backset is just an ivar of the door object) Does that look ok, or am I skipping another controller that should be in there? Skipping controllers is probably one of my most serious bad habits that I'm trying to break. Using an intermediate controller may be a stylistic issue, but your approach above is not wrong. If the bound fields are editable, I recommend using an intermediate NSObjectController because you will get some useful behavior for free, such as -commitEditing and the like. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Bindings Driving Me CRAZY. :'(
On Oct 12, 2009, at 11:52 AM, Gustavo Pizano wrote: Ok this is what I have: 1. InvoiceGenViewController.m - Controller for the InvoiceGenView.xib 2. UserListViewController.m - Controller for the UserListView.xib 3. InvoiceEditionViewController.m - Controller for the InvoiceEditionView.xib InvoiceGenView.xib, has a slipt view and InvoiceGenViewController has 2 IBOutlets NSView one for the each view of the split view and also has an instance of UserListViewController and InvoiceEditionViewController, so when loading the nib, I create those controllers with their respective nib files. So far so good. The UserListView has an IBOutlet NSArrayController with a connection in IB to a NSArrayController instance called Users Array. In IB for the UserListView.xib, I bind the NSManagedObjectContext to the Files's Owners managedObjectContext, which Im getting form the ApplicationDelegate. And I placed a NSTableView with the column binding to Users Array ; controller key :: arrangedObject ; Model Key Path: completeName. So when the whole window with all this views loads I can see in the ;left side a list of Users, displaying the concatenated name. Anyway, its working till this point. The problem is that when I select an item form the NSTableView(which is in the UserListView), I want to display its details in the other view which is controlled by InvoiceEditionViewController and it's in another .xib. NO SUCCESS! :( I have tried passing the instance of the NSArrayController from UserListViewController to InvoiceEditionViewController (IBOutlet also) and connecting it to an Instance of NSArrayController in the InvoiceEditionViewController.xib (called Ref Users List). Then setting the fields bindings to: Bind : Ref Users List Controller key : selection Model Key Path: firstName etc for the rest of fields. This doesn't appear sensible, and you may have a number of problems. First, make sure that InvoiceEditionViewController is being instantiated properly. Second, simply have a reference to UserListViewController in InvoiceEditionViewController, which can be an outlet if InvoiceEditionViewController can be sensibly instantiated via xib, or set by other means. I recommend then to have an NSObjectController in InvoiceEditionViewController.xib whose content is bound to UserListViewController.NSArrayController.selection (using correct ivar/property names, of course). HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Bindings Driving Me CRAZY. :'(
On Oct 12, 2009, at 1:33 PM, Gustavo Pizano wrote:
Keary Hello:
This doesn't appear sensible, and you may have a number of
problems. First, make sure that InvoiceEditionViewController is
being instantiated
this is what Im doing: in the awakeFromNib
if(_userListController == nil){
_userListController = [[UserListViewController alloc]
initWithNibName:@UserListView bundle:nil];
}
if(_invoiceController == nil){
_invoiceController = [[InvoiceEditionViewController alloc]
initWithNibName:@InvoiceEditionView bundle:nil];
}
[_myUserListView addSubview:[_userListController view]];
[_myContentView addSubview:[_invoiceController view]];
[_invoiceController setUserController:_userListController];
You mentioned having an outlet from the UserListViewController to the
InvoiceEditionViewController--this can only be accomplished in the
InvoiceEditionViewController is in the UserListViewController's nib,
in which case you are instantiating two different
InvoiceEditionViewControllers and hence experiencing problems.
If the InvoiceEditionViewController is *not* in the
UserListViewController nib, the above should work fine, except still
consider the NSObjectController but with the correct key path.
properly. Second, simply have a reference to UserListViewController
in InvoiceEditionViewController, which can be an outlet if
ok done I have now there this : IBOutlet UserListViewController *
userController;
This is only useful if the InvoiceEditionViewController is
instantiated in the UserListViewController nib, If it is, then chances
are that the InvoiceEditionViewController is not being instantiated
correctly unless you have overridden -init or -initWithCoder:,
depending on the super class.
InvoiceEditionViewController can be sensibly instantiated via xib,
or set by other means. I recommend then to have an
NSObjectController in InvoiceEditionViewController.xib whose
content is bound to
UserListViewController.NSArrayController.selection (using correct
ivar/property names, of course).
Ok I tried but when wan tto bind the labels to show the details I
bind it to the NSObjectControlled I just configured, and the
controller key goes to selection, which its not good, so whe I run I
see its NO Selection. label.
No, selection is the correct controller key for data access. It is
confusing for an object controller as there will only be one selection
(or none), but that is how it works.
I did instead was to place an NSArrayController (users) in IB and
bind the contents to
userController._userListArrayController.arrangedObjects.
then the labels I bind the values to users, and the controller key
to selection and the path to the attributes of the entity.
And it works 50%, I can see the values., but when I select another
user, the values dosn't change, it's seems its getting only the 1st
value of the array.
Of course. You are creating a whole different array controller that
has its own selection semantics. Bindings are automatic but not magic.
Scrap the array controller approach. It won't work. Do an
NSObjectController instead.
Google binding across nibs (you may need to try a few variations on
the preposition for best results) and you will find numerous
discussion and techniques.
Keary Suska
Esoteritech, Inc.
Demystifying technology for your home or business
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Re: Help needed with orientation to bindings
On Sep 21, 2009, at 6:20 AM, Graham Cox wrote: So, I have objects that can be selected. None, one or many objects might be in the selection. The current selection is available as an array property in the base controller (NSWindowController subclass) of this particular UI. Each selected object has a dictionary of associated data. It is this data I wish to edit via a table view with columns for keys and values. This seems like a perfect fit for NSDictionaryController. Where I'm having trouble is understanding how to deal with multiple selections (that is, multiple dictionaries presented by the main selection, not multiple selections in the table view - in fact the table view selection is largely unused). If there is a single selection, all well and good - looks like NSDictionaryController is a good fit out of the box. But for multiple selections, I'm less clear. I do need to be able to present in the UI effectively a merger of all the selected dictionaries, with all keys shown across the selection. Where multiple objects have the same key, this is one table row, either showing multiple values in the value column for that row, or the value if it's the same for all objects. Editing the value sets the values against that key for all objects, including adding that key/value to dictionaries for selected objects that currently lack it. I'm sort of thinking that I need two controllers, a bit like the Attacker/Weapon example in the documentation - but I can't be sure because not enough stuff is clear in my head, and besides, all the actual selection code is handled externally - I just have a -selection property returning the objects. Bindings don't handle aggregate/coalesce. You will need to do that yourself in the main or a mediating model. Observe the controller's selection (or table view notifications) to update on the fly. If I can progress on the first part, the next problem is representing the data type of the key/value pair. A given key will be associated with a definite data type - string, integer, real or boolean value. Ideally I'd like to add the appropriate cell type to the table row for the 'type' column. My current classically implemented UI doesn't do this at all, so this would be a new feature. It's very similar to the tables displayed by the plist editor application. Looking at NSDictionaryController it seems as if the only thing I can do for added values is set a string using - setInitialValue:, so I'm not sure how to handle the different data types. Also not a bindings-supported behavior. Implement table view delegate methods to provide cells on the fly. You can apply formatters or transformers to force default values (if you can't do that at the model level). HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: sortedArrayUsingFunction
On Aug 24, 2009, at 4:46 PM, Boyd Collier wrote: The Discussion section in the current documentation for the NSArray method sortedArrayUsingFunction: context: reads The new array contains references to the receiver’s elements, not copies of them. Nothing is said about incrementing the retain count of the objects in the array, which seems reasonable. However, some time ago, I copied and pasted what was in Apple's earlier documentation into my code, and it read The new array contains references to the receiver's elements, not copies of them. The retain count is incremented for each element in the receiving array. Was the second statement, i.e. that the retain count of each element is incremented, an error or has the method itself been changed, or am I misunderstanding something (always a strong possibility)? The element objects will be retained by the new array (in addition to being retained by the original array). This isn't explicit because it is a function of NSArray by definition. Refer to the NSArray API doc for this explicitly. For the sake of accuracy, you should replace every occurrence (including in your own brain) of the statement The retain count is incremented with A -retain message is sent to. It is possible, and not uncommon, that the retain count of an object may never increase or decrease, as is the case for singletons. Such an increase or decrease should be irrelevant to you in most cases. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: [NSObject setValue:forUndefinedKey:] no longer requires explicit KVC notifications?
On Aug 7, 2009, at 12:50 PM, Gabriele de Simone wrote: It used to be that if you overrode -[NSObject setValue:forUndefinedKey:] your own subclass was responsible for calling -[NSObject will/didChangeValueForKey: so that bindings and observers would work as expected. That was fine, since it allowed one to provide different implementations depending on the key, and to generate (or not) KVC notifications. It seems that a recent update to Mac OS X (perhaps 10.5.8?) has changed this behavior. It seems that as long as you override setValue:forUndefinedKey:, KVC-compliant notifications are automatically generated for the given key. Can anyone confirm this? This is an interesting change to the Cocoa framework that probably interferes with any class that overrides [NSObject setValue:forUndefinedKey:]. Calling will/didChange should never have been necessary, and in fact, the setter sequence should be automatically wrapped with the calls, as long as automatic notification is on. AFAIK, this has always been the case and hasn't changed recently. There may be more side effects than before, but I don't recall. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Confused about NSPrintInfo margins
On Jul 9, 2009, at 7:48 PM, Graham Cox wrote: Thanks Joel, certainly setting the margins directly does work. What I'm left wondering is what they are actually for - they are never set by he Page Setup panel and never change with changes to paper size, printer, etc. The docs aren't specific, and it is probably worth filing bugs against the docs. It takes some investigating, testing, and looking at sample code to get the whole picture. Page setup only sets five or so settings, listed in the constants section of NSPrintInfo. I would never have thought that paper size or printer would effect margins, and I am glad that they don't as it would lead to highly undesirable behavior. Printer maybe because different printers have different minimum margins, but unfortunately Apple doesn't give us that for free. Paper size should only be used for its namesake--i.e. to specify the dimensions of the physical page and nothing else. In fact, nothing else is effected AFAIK, and as you may be seeing. My conclusion is that these fields are merely a convenience for specifying arbitrary user margins, and if you want to use them you have to a) add UI to set them and b) make use of them in your code somewhere. By default they do nothing, are ignored and have no effect whatsoever on printing unless your code decides not to ignore them. Unfortunately this is all guesswork as the docs do not discuss it anywhere I can find. At the very least I will file a bug asking for better documentation on this. Yes, but a) only though. Perhaps you mean something else by b) but I can attest that in fact when you change the margins of an NSPrintInfo that any print job using that object will indeed use the specified margins. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: MVC....brief question
On Jul 7, 2009, at 6:31 AM, Michael de Haan wrote:
+ (NSSet *)keyPathsForValuesAffectingBmi /* bmi is model Ivar */
{
return [ NSSet setWithObjects:@weight, @height, nil];
}
My question. I included the above method in the model, as this is
the only place available. I just wonder if this is correct?
The only appropriate location for the method is the object that has
all of the referenced properties.
(in a sense it enables the getter bmi. )
Not in any sense, really. It simply tells all observers of bmi that
bmi has changed every time weight or height changes.
Keary Suska
Esoteritech, Inc.
Demystifying technology for your home or business
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Re: Problem with NSDecimalNumber truncating zeros
On Jul 6, 2009, at 2:35 PM, Eric Hermanson wrote: NSDecimalNumber *number = [NSDecimalNumber decimalNumberWithMantissa:2200LL exponent:-2 isNegative:NO]; This results in a decimal number that is represented both internally, and as a string, as 22 instead of the desired 22.00 Because of the functionality I am trying to achieve, I need to know the difference between 22 and 22.00, but I can't figure out how to get NSDecimalNumber to retain the trailing zeros. Does anyone have advice? You shouldn't make statements about the internal workings of API classes that you really don't understand. Specifically the statements about internal representation and truncating are false. That being said, if you want to compare the string representations of two numbers, then ensure that they are formatted similarly. Hence, use an NSNumberFormatter, preferably the same for both numbers. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: User interface validation doesn't work, right?
On Jul 2, 2009, at 11:52 AM, Bill Cheeseman wrote: On Jul 2, 2009, at 12:24 PM, Keary Suska wrote: Because the two protocols in question are formal protocols, the @interface declaration must specify conformance. If it doesn't, then no assumption of conformance should be made. Pure and simple. Also, protocol conformance is not inheritable in Objective-C. 1. Taking that last point first, the Objective-C 2.0 Programming Language document says this: A class is said to conform to a formal protocol if it adopts the protocol or inherits from another class that adopts it. I believe, without checking, that this was true in 1.0, also. I take that to mean that protocol conformance is in fact inherited. That makes sense, because a protocol is simply a promise that certain methods are implemented, and implemented methods are inherited by subclasses. Yeah, I misspoke there. You are absolutely correct. 2. The key question for me is your first point. The way I work around the lack of automatic validation for buttons is this: In my window controller, I implement - validateUserInterfaceItem: and declare that my controller conforms to the NSUserInterfaceValidations protocol. That's exactly what NSDocument does, as I understand it. Since user interface items are not automatically validated, I force validation by implementing NSWindow's -windowDidUpdate: delegate method so that it loops through all subviews of the window calling my controller's - validateUserInterfaceItem: protocol method. (I could use something other than -windowDidUpdate: to trigger the protocol method if efficiency becomes an issue, but at this point doing it every time the window updates works just fine. I am aware that Apple is struggling with efficiency concerns in automatic validation of toolbar items.) Why not use bindings or KVO? They will likely be much more efficient, easier to implement, and provide more control. Now here's my question for you: In my controller's implementation of -validateUserInterfaceItem:, I can either limit the items that I enable/disable by checking whether their class is NSButton (which I know responds to -action and -setEnabled:, and I can confirm that programmatically). Or, instead, I can limit the items by checking whether they conform to the NSValidatedUserInterfaceItem protocol. If I do the latter, I have to declare a subclass of NSButton and declare that it conforms to the protocol because NSButton does not itself declare conformance, and of course I have to set the type of my buttons to my subclass type in Interface Builder. Either technique works (I know because I've already done it), but testing for compliance with the NSValidatedUserInterfaceItem protocol somehow seems purer to me. The whole approach seems problematic to me. I would say that you should use the API when you can, and work around it only when you can't (I am full of ambiguous maxims these days!) I.e., allow menus (includes popups) and toolbars and any other object that conforms to NSValidatedUserInterfaceItem proper (proper in the Objective-C view, as opposed to your view--this has been hashed out enough I won't elaborate) to use their automatic validation, and use a home grown solution for everything else. The latter solution also preferably working with the API rather than around it (e.g. KVO), because you can. Where would you come out on this question? From your comments, I assume you would say I should not subclass NSButton and declare it as conforming. Then I would have to simply check whether the class of an item is the NSButton class. You might also insist that I should not name my validation method -validateUserInterfaceItem:, but something else such as -updateWindow, because I risk confusing people about what my controller really does. In that case, I'm back where most Cocoa applications were before Cocoa bindings were invented, declaring a custom -updateWindow method and calling it from -windowDidUpdate or whatever. Yes, because as others point out, we don't actually know how (more importantly, when) validation is called, so we don't know how to duplicate it. I doubt that declaring conformance is sufficient. I would prefer to do things the NSUserInterfaceValidations way, so that I'm ready when Apple gets around to making user interface item validation automatic, which I really think it ought to do (with an on/off switch). (Apple will probably say I should move on to Cocoa Bindings and get over it.) I would agree with Apple, or as a concession, say use KVO. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your
Re: User interface validation doesn't work, right?
On Jul 2, 2009, at 1:48 AM, Bill Cheeseman wrote: I'm not assuming that it works with all user controls. The document I quoted from says it does, explicitly and in detail, without qualification. All I asked in my original post is whether I'm correct in concluding that in fact buttons don't work that way. I understand that you've all confirmed that I'm correct in my conclusion. Thanks. You have to confess that the docs don't say, all user interface items conform to the NSValidatedUserInterfaceItem protocol and therefore support validation. That is the only true *detailed* and *explicit* statement that would indicate such. Anything else is an inference, although a reasonable and understandable inference, considering the docs in isolation. Your argument seems to make the case that the problem is precisely how the docs are *not* explicit, and therefore allow or encourage an incorrect inference. I agree, conditionally. It doesn't help to refer me to the NSUserInterfaceValidations and NSValidatedUserInterface protocol documents, because that's where I started. They are ambiguous, and they're very short on explanation. In fact, I turned to the User Interface Validation document precisely because I was seeking clarification of the protocol documents. Telling me to go back and look at the protocol documents doesn't help. Well, looking at the methods that both protocols does shed light on their purpose, as was explained by Andy Lee. In trying to pin down whether buttons also do so, I looked at the NSButton Class Reference document and found that it expressly conforms to the NSUserInterfaceValidations protocol. I don't understand why you say it doesn't. I defer to Andy's explanation. I did find it confusing when I read the NSMenuItem and NSToolbarItem Class Reference documents, which say that they conform to the other protocol, the NSValidatedUserInterface protocol. But this tends to suggest that NSButton will work, too, since NSControl, from which NSButton inherits, also conforms to the NSValidatedUserInterface protocol. It doesn't say so, but Apple's documentation has a long history of neglecting to mention all the protocols that a class conforms to. I was able to confirm from the NSControl Class Reference document, and you can too, that NSControl does implement the -action and -tag methods required by the NSValidatedUserInterface protocol. So, again, I don't understand why you say it doesn't. It's not a matter of docs, although it would be preferable that the docs *do* indicate every protocol. Because the two protocols in question are formal protocols, the @interface declaration must specify conformance. If it doesn't, then no assumption of conformance should be made. Pure and simple. Also, protocol conformance is not inheritable in Objective-C. Therefore, neither NSControl, nor NSButton, conform to the NSValidatedUserInterface protocol. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSObjectController, content outlet and content object question
On Jul 1, 2009, at 8:03 AM, Michael de Haan wrote: I have previously used the content outlet to establish a connection between NSObjectController and its object. Is contentObject an alternative way to do the same thing and the best reply by mmalc: If you set the contentObject of an object controller, then -- just as anywhere else in Cocoa -- you're setting one of its properties (typically an instance variable) and it's then the recipient's responsibility to look after it. If you bind the contentObject, they you're telling it to keep it synchronised with whatever is at the end of the keypath you provided from the source object. So, when I emulated the currency converter, with bindings, I was surprised when they connected the NSObjectController to the model using the content outlet of NSObjectController, as per the above discussion. ( What I **expected** (clearly incorrectly) was that, in order for the project to work, one would have to bind the view to the controller, then bind the controller to the model). So, I was puzzled when **both** approaches worked ie binding the view to the controller, and **either** binding the controller to the model ( with keypath self) OR setting the controller's content to the view. (Cntrl-dragging from the controller to the model). It might well be possible that I am thinking about the bindings incorrectly...and in fact all one needs in this case is to bind the view( textfield and slider) to the controller with the correct keypath, and that the relationship of a controller to it's content is the issue I am not completely understanding. Binding only involves two endpoints (objects). That there are additional inter-object connections involved in a design is a design issue and not inherent to bindings in any way. So it is irrelevant to the view-controller bindings how the controller gets its content, and there are multiple ways this can be done. It appears that you are assuming that bindings involves three objects ion an MVC pattern. MVC is a design pattern, bindings are only one way to connect objects, such as M-C or V-C, but are not themselves an implementation of MVC. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Basic KVO question
On Jun 29, 2009, at 6:09 PM, Tim Schmidt wrote: first of all, thanks for reading this. I have a basic KVO question. In one of my NIBs I have an NSArrayController and a NSSegmentedControl with add/remove segments for the array of said controller. Now I want to enable the remove-segment according to the controllers canRemove message. I've set the NIB's viewcontroller as an observer of the arraycontroller's canobserve property as follows: [statesController addObserver:self forKeyPath:@canRemove options:NSKeyValueObservingOptionNew context:PED_CAN_REMOVE_STATE_CONTEXT]; and receive the obligatory change notifications alright, but the change dictionary always contains an NSNull instance for the NSKeyValueChangeNewKey instead of the NSNumber bool subclass I would expect. Am I doing something wrong here? This is probably due to a known bug that will not likely ever be fixed. In your particular case, it doesn't matter, as the value will have been changed before you receive the observer message. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: User interface validation doesn't work, right?
On Jul 1, 2009, at 3:24 PM, Bill Cheeseman wrote: For years, the Implementing Validation section of Apple's User Interface Validation document has said the following: Before it is displayed, a user interface item checks to see if its target implements validateUserInterfaceItem:. If it does, then the enabled status of the item is determined by the return value of the method. You can therefore conditionally enable or disable an item by implementing validateUserInterfaceItem: in the target object. This has never been true. Right? No, I would say it is usually true, but not always. My custom window controller implements the action method for a button, so it is the button's target, and it also implements - validateUserInterfaceItem:, all according to the User Interface Validation document. But my -validateUserInterfaceItem: method is never called. Implementing the action method isn't sufficient, BTW. The object must also be the current target (i.e. first responder for nil-targeted actions, or designated target). Also note that not all user interface items do this--they must conform to the NSValidatedUserInterfaceItem (or NSUserInterfaceValidations) protocol, which IIRC NSButton does not. In fact, I think only menu items and toolbar items do. If I want it to be called automatically, by analogy to - validateMenuItem:, I have to override NSWindow's -update method, by analogy to -[NSMenu update]. In my override of -update, I have to do for myself what the document claims already happens -- or I have to observe NSWindow's -NSWindowDidUpdateNotification. Right? Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: User interface validation doesn't work, right?
On Jul 1, 2009, at 5:27 PM, Bill Cheeseman wrote: My controller is the target, which according to Apple's documentation, and according to my understanding for many years, means simply that it implements the button's action method. My controller does in fact implement the action method. In addition, my controller is in the responder chain, which is demonstrated by the fact that the action method, which is connected to the First Responder proxy in Interface Builder, executes correctly when I click the button. Also, I declare the controller to conform to the NSUserInterfaceValidations protocol, which it does because it implements the -validateUserInterfaceItem: method. NSButton does conform to the NSValidatedUserInterfaceItem protocol, as its header file confirms, and it does implement the -action: and -target: methods required by that protocol. So I think you are claiming this works because the documentation says so. I'm saying the documentation is wrong because it doesn't work. I would love to see a project proving me wrong. Can you show me one? No, I am saying that it works as advertised for objects that it works for. NSButton is not one of them, and never has been. You seem to assume that all user interface items should, but they don't, and never have, and the documentation has never said that they did. The documentation is explicit: The protocols NSUserInterfaceValidations and NSValidatedUserInterfaceItem provide a standard way to validate user interface items—that is, to set their state as appropriate for the current application context Validation is not a function of user interface items, it is a function of the protocol(s) listed. Neither NSButton, nor any of its parents conforms to the protocol, so none of them support validation of this kind. Look at NSMenuItem, and you will see that it does, and that your validation method will always be called. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: resizing table view programmatically
On Jun 25, 2009, at 9:47 AM, Daniel Child wrote: I would like to resize a table view programmatically. I will be resizing based on the number of rows (which I know in advance), given a fixed row height which I set myself. I tried resizing the window's contentView and that did not work. I know that a window, a scroll view, and a clip view are all involved, and sizing all of these manually seems like the wrong approach. What is the easiest way to get the window and table to resize based on a calculated number of rows and fixed row height? Is there a simple approach that avoids resizing each individual view? Just resize the window, as long as the scrollview resize flags are set to resize with the window. That should be all there is to it. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSArrayController's add: swaps entire content array when array is accessed via keypath
On Jun 25, 2009, at 8:31 AM, Rick Hoge wrote: All worked fine, except that, when the new dictionaries are added by clicking the add: button, the mutable array managed by the controller is replaced with a new array (rather than inserting the new dictionary in the original array). The new array has the correct content, apparently having copied all the pre-existing dictionaries from the old array. This would be ok, except that I observe changes to topLevelDictionary.subArray (see below) and need to perform special processing on new items inserted in the subArray. This only works if -observeValueForKeyPath:ofObject:change:context: is called with a change type of NSKeyValueChangeInsertion, and I can access the inserted items using [change valueForKey:NSKeyValueChangeNewKey] I confirmed that if subArray is promoted to an instance variable, then add: will perform an insertion rather than creating a new array (in fact I've used this a lot in the past). It seems that having the array be part of a mutable compound object results in creation of a new, copied array instead of an insertion. There are a number of ways I can work around this, but I don't really understand why this difference in behavior (array accessed as instance variable vs. keypath inside compound object) is happening. Is this a bug? or does it make sense in some way? This all would have been really simple if it worked as expected... I believe your presumption here is incorrect. In both cases, the array should be replaced on every change. Only if you implement indexed accessors should this be different. Are you instead talking about KVO notifications? You could get different kinds of notifications depending on certain implementations. In your example I would expect KVO notifications to be the same. Do you implement standard setkey accessors in your instance variable test? Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSViewController awakeFromNib and NSTableView numberOfRowsInTableView
On Jun 25, 2009, at 7:33 PM, Peter Zegelin wrote:
I have come across what seems to be a weird situation and can't
really think of a good solution. I'm relatively new to Cocoa so its
probably just a simple misunderstanding.
I have a subclass of NSViewController that also acts as the delegate
for the NSTableView that it controls. This tableview is loaded into
my main window. I want to be able to hide some columns in the
tableview and as a result, the number of rows in the tableview will
vary according to numColumns. ie:
-(int)numberOfRowsInTableView:(NSTableView *)tableView{
return myDataSize/numColumns;
}
Now, I haven't got around to actually varying the number of columns
in the table yet, but I do have a property 'numColumns' that I set
to a reasonable value in awakeFromNib:
- (void)awakeFromNib{
numColumns = 8;
}
Unfortunately my numberOfRowsInTableView is being called 'before'
awakeFromNib, so initially numColumns = 0 and I get an error
(myDataSize/numColumns will be infinite).
I always thought awakeFromNib would get called first. But in this
case not so. So can anyone suggest why, and a workaround?
There is no such guarantee for -awakeFromNib. You either need to set
the value earlier, or call -reloadData on the table.
Best,
Keary Suska
Esoteritech, Inc.
Demystifying technology for your home or business
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Re: UndoManager for NSApplication
On Jun 16, 2009, at 7:45 AM, Reza Farhad wrote: I would like to have the facility of undoing deleting of a window. The best way that I thought I could do this is was to use the UndoManager belonging of my NSApplication. However when I try to get the undoManager for the application by calling: [ NSApp undoManager ] I get a nil pointer. Also I could not see any straight forward way of setting an undoManager for a NSResponder. Any suggestions how I can resolve this issue. AFAIK, of the NSResponders only NSWindow creates its own NSUndoManager. Now, any responder on a window will automatically search up the responder chain for an undo manager, so it should automatically get the window's. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Bindings and nested preferences
On Jun 16, 2009, at 11:25 AM, Andy Klepack wrote:
I'm curious about what patterns exist for binding to nested sets of
preferences such as a dictionary value at the top level of the user
defaults. I've seen a couple of questions similar to this, but no
one appears to have received the definitive answer.
My scenario is that I have an application with several distinct
modules and I would like each module's preferences to be stored in a
separate dictionary.
Say the user defaults look like so:
{
module = {
moduleValue = xyz
}
}
The module has a nib with a text field that should be bound to the
moduleValue. I'd like to have it bind to
sharedUserDefaultsController.values.module.moduleValue. As far as I
can tell this is not valid. The bindings system thinks that
'module.moduleValue' is the key in the user defaults to bind to.
This is almost certainly not the case. What makes you think it is?
My second approach was to create an NSObjectController for which the
content was bound to sharedUserDefaultsController.values.module. I
then bound the text field to objectController.moduleValue. In this
case there were problems when the module dictionary did not already
exist (the object controller's content was null), plus whenever the
value moduleValue was set it didn't trigger any user defaults
behavior since it was a modification of nested content and thus
didn't trigger change notification for defaults themselves.
The most obvious solution is to create a custom object
(ModuleController) for the nib, create a moduleValue property with
custom accessors, implement those accessors to interact with the
user defaults, and then bind the text field to those properties. At
the same time, that seems pretty code intensive for something I
suspect is a fairly common design.
The issue is usually not about nested structures, but about the fact
the plist backing of user defaults does not use mutable objects.
Therefore, all of your dictionaries are immutable NSDictionary's.
Unfortunately the NSUserDefualtsController isn't smart enough to deal
with nested structures, so you have to provide your own intermediary.
So, this last approach is really (AFAIK) the common pattern for
dealing with nested structures on user defaults.
Keary Suska
Esoteritech, Inc.
Demystifying technology for your home or business
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Re: NSOutlineView and tags...
On Jun 7, 2009, at 9:54 AM, Scott Andrew wrote: This may sound like a newbie questions but never had this issue before.. I am trying to add a tag ID to an NSOutlineView thats in one view controller. In another view controller is a table view. I listen to NSOutlineViewSelectionDidChange notifications and fill the table based on the selection. This listens to all outline views (even the open file panel). So i put a tag id on my NSOutlineView and wanted to check for that particular tag. But it always comes up 0. I have a work around for this by listening for selection changes in the tree controller and firing off a notification based on what was actually selected. I am now just curious about the NSOutlineView and the tag field. I couldn't find anything that said you couldn't tag a outline or table view control. First off, how are you setting the tag, and what value are you setting? How are you checking the tag (show code)? I haven't heard or experienced any issues with NSOutlineView and tags, but if you have a reducible/reproducible case, you can file a bug. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Searching in NSArray
On Jun 5, 2009, at 9:36 AM, Pierce Freeman wrote: Hi Everyone: I am most likely overlooking this function, but I just can't seem to find it in the documentation. I am looking for some way to search an NSArray listing for one string that is part of multiple objects in the array. This search then returns the number of objects that contained that string in it. I imagine this would be built into NSArray, so if anyone could steer me in the right direction, it would be greatly appreciated! There isn't a method for this specific operation. The right direction is likely -filteredArrayUsingPredicate:. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: KVO and master-detail NSTableViews
On Jun 4, 2009, at 4:24 AM, Stefan Reitshamer wrote: I'm getting flaky behavior from my KVO code and I'm wondering what I'm doing wrong. I can't find any similar examples. I have a pop-up button and 2 NSTableViews. The pop-up button selection controls the content of the left NSTableView. The left NSTableView's selection controls the content of the right NSTableView. The pop-up button and NSTableViews are bound to separate NSArrayControllers. Each NSArrayController is bound to a separate NSMutableArray property in my app controller. My app controller observes selectionIndex in the pop-up button's NSArrayController and selectedObjects in the left NSArrayController. On startup, the pop-up button is populated, which causes a call to observeValueForKeyPath:ofObject:change:context:. This sets the left NSMutableArray, which in turn causes another (nested) call to observeValueForKeyPath:ofObject:change:context:, which sets the right NSMutableArray. There seems to be a race condition -- sometimes the left table view is populated, sometimes the right, sometimes none. Each time I edit the nib, the behavior changes. If your code depends on the order that objects in the nib are initialized, this may be the reason for unexpected behavior. Some changes to a nib might effect this loading order, which should be considered non-deterministic anyway. Is this a bogus way to implement the dependent NSTableViews? What's the right way? If it is not necessary to route all the controller's content through the app controller, you may have better luck hooking the controllers together. Refer to this: http://developer.apple.com/documentation/Cocoa/Reference/CocoaBindingsRef/BindingsText/NSArrayController.html#//apple_ref/doc/uid/NSArrayController-DontLinkElementID_24 in particular the contentObject binding. RightTVController contentObject -- LeftTVController.selection.array_key_path LeftTVController contentObject --- PopUpController.selection.array_key_path Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSMutableURLRequest weirdness!
On Jun 4, 2009, at 2:11 PM, Ammar Ibrahim wrote:
Hello, I'm about to bang my head against the wall. Here's the
situation, I'm
trying to send many requests using the same request object, I have a
method
which I call frequently, which has the following piece of code:
This is not all the relevant code, and is insufficient to help. All I
can say is, are you re-using the same NSURLConnection, just changing
the request? If so, that wouldn't work. NSURLConnection copies the
request on initialization.
NSMutableURLRequest *newReq = [[NSMutableURLRequest alloc] init];
[newReq setHTTPMethod:@GET];
[newReq setURL:[NSURL URLWithString:[@/media
stringByAppendingPathComponent:[currentTrack
objectForKey:@Persistent ID]]
relativeToURL:[self serverBaseUrl]]];
NSURLConnection *connection = [NSURLConnection
connectionWithRequest:newReq
delegate:self];
if (connection == nil) {
//connection couldn't be created!
NSLog(@Connection couldn't be created: %@, [newReq URL]);
[self startSyncAfterTimeInterval];
}
The first request works, after that it seems to not even send the
request,
although the server is still responsive! I get the following error:
*Connection failed with error: Error Domain=NSURLErrorDomain
Code=-1001
UserInfo=0x1397a40 timed out*
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Re: Image (or view ?) not scaling with window
On Jun 3, 2009, at 7:45 AM, vinai wrote: I've run into a case where an image I am creating does not scale with its parent window. Some background - I am trying to create and application to process data stored within a file - much like any image data with a header. However, I am not opening anything with a standard image format. I have a selector panel than selected the kind of data I am reading, and lets me select the file. Based on the header information in that file, I create a window, view, image, image representation with the appropriate parameters, and I can already create the window and draw the contents of my file to it. It does this initial drawing properly. The problem is, when I grab the edge of the window to resize it, the image that's drawn to it does not reisze with the parent window. It maintains its original size, and stays centered in the window view. My initialization code for the GUI elements of that window is below. Is there a flag I am missing somewhere in this, or do I need to handle view and image resize updates in another routine ? What happens when you set image scaling for the NSImageView? Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Detecting when fetch: finishes
On Jun 3, 2009, at 5:12 PM, Ulai Beekam wrote: I have an NSArrayController that, at the request of the user, can be given a new fetch predicate. To do that I use the setFetchPredicate: method. How can I detect when this predicate has been applied and the appropriate fetching is done? I have not come across any delegate method for it. I suspect that this is made tricky because of the following quote from the docs under the fetch: method of NSObjectController (which by the way is a superclass of NSArrayController): Beginning with Mac OS X v10.4 the result of this method is deferred until the next iteration of the runloop so that the error presentation mechanism can provide feedback as a sheet. So the problem is that it finishes somewhere in the next runloop iteration, making it harder to do some custom things after it finishes. There isn't any way that I know that is more work than it is worth. Better to do the fetch yourself. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Detecting when fetch: finishes
On Jun 3, 2009, at 6:19 PM, Ulai Beekam wrote: What do you mean do the fetch myself? Do you mean I should not use an NSArrayController? That would sound overkill as NSArrayController plus its fetch predicate gives me a lot of functionality for free, e.g. updating dynamically when underlying objects are added/removed. Can you elaborate? No, you can use the array controller, just have an object that provides the controllers content instead of having the array controller fetch it itself. Bind the NSArrayController's contentArray to the array managed by the object, and turn off prepares content. You will still get all the free functionality as long as you always add/ delete through the array controller or through KVO-compliant means. If you need to watch for insertions/deletions that are performed outside of the array controller and it is not practical to route them through the object managing the content, you can have it simply observe theObjectsDidChange notification. See the docs for how to access the changed objects. I think that is all that the controllers do anyway. I suppose you could call -performSelector:afterDelay: for your followup function, playing with delay values until you find one that seems to reliably occur after the fetch. I don't know whether this approach is deterministic, or how you would handle an error situation. Seems altogether better to me to just handle fetching yourself. I wonder if you can make an NSArrayController subclass, override - fetchWithRequest:merge:error: to just call super, and after the call (which should be synchronous), call your special post-processing method. Just a stab in the dark, but might work. From: cocoa-...@esoteritech.com To: cocoa-dev@lists.apple.com Date: Wed, 3 Jun 2009 17:31:32 -0600 Subject: Re: Detecting when fetch: finishes On Jun 3, 2009, at 5:12 PM, Ulai Beekam wrote: I have an NSArrayController that, at the request of the user, can be given a new fetch predicate. To do that I use the setFetchPredicate: method. How can I detect when this predicate has been applied and the appropriate fetching is done? I have not come across any delegate method for it. I suspect that this is made tricky because of the following quote from the docs under the fetch: method of NSObjectController (which by the way is a superclass of NSArrayController): Beginning with Mac OS X v10.4 the result of this method is deferred until the next iteration of the runloop so that the error presentation mechanism can provide feedback as a sheet. So the problem is that it finishes somewhere in the next runloop iteration, making it harder to do some custom things after it finishes. There isn't any way that I know that is more work than it is worth. Better to do the fetch yourself. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSXMLParser - howto resolve entities defined in DTD
On May 31, 2009, at 4:31 PM, Dominik Pich wrote: Hi, I use NSXMLParser to parse large XML files-- going good BUT :) I cant get the parser to resolve the external entities from the DTD. I googled and read documentation and older mails... and I did set parser.shouldResolveExternalEntities = YES Well, the docs state: 1) An NSXMLParser notifies its delegate about the items (elements, attributes, CDATA blocks, comments, and so on) that it encounters as it processes an XML document. It does not itself do anything with those parsed items except report them. and 2) in setShouldResolveExternalEntities, Indicates whether the receiver reports declarations of external entities using the delegate method parser:foundExternalEntityDeclarationWithName:publicID:systemID:. I should be clear, then, that NSXMLParser does *not* resolve external entities in any way, only reports them, and explains what you see. I do get: - (NSData *)parser:(AQXMLParser *)parser resolveExternalEntityName: (NSString *)name systemID:(NSString *)systemID but I have no idea what to return... the entities are defined in the DTD... As the docs say, An NSData object that contains the resolution of the given external entity if I could get the folowing for the entries in the DTD, I would just build a table myself - (void)parser:(AQXMLParser *)parser foundInternalEntityDeclarationWithName:(NSString *)name value: (NSString *)value; Still, shouldnt NSXMLParser do entity substitution for me? somehow... :) The companion document to NSXMLParser, Event-Driven XML Programming Guide for Cocoa, tells you what you need to do to resolve external entities. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSXMLParser - howto resolve entities defined in DTD
On Jun 1, 2009, at 1:43 PM, Dominik Pich wrote: :) thanks but . it doesnt work for me. I read all that about NSParser just calling you back. I implemented all the delegates BUT I dont seem to be getting an appropriate callback for the Entities in the DTD, although I did set 'shouldResolveExternalEntities = YES' I get that messages asking me to PROVIDE a substitution for an entity But I never get the messages FOR the declaration of the entities, so I dont know WHAT to return as data. I hope I explained my issue? For example: In the xml I have nameOfPerson; goes to nameOfCiname; :) I never get to know about the declares (which are in the DTD. which should be loaded. no?) No. That's the point. NSXMLParser does nothing outside of parsing the particular XML. It does not load DTDs, it does not validate, it does not resolve any links. It is the responsibility of the delegate to handle such things as DTD-related functions. You can use the NSXMLDTD class for this. All external entities must be declared in the core XML. If they aren't, your XML is not well-formed. When the parser finds and external entity declaration, the delegate is sent - parser:foundExternalEntityDeclarationWithName:publicID:systemID: . This just gives you a heads-up that the XML document expects to need to resolve that entity. When it finds the entity, you should be sent - parser:resolveExternalEntityName:systemID: (if you set the option), where you return the declaration as it appears in the DTD (as NSData). I believe that NSXMLDocument may provide the functionality that you want, so you might want to look down that route. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSXMLParser - howto resolve entities defined in DTD
On Jun 1, 2009, at 4:03 PM, Keary Suska wrote: All external entities must be declared in the core XML. If they aren't, your XML is not well-formed. Correction, this would not be the case for declarations in a DTD, which are part of the external subset, so the first delegate message should not be sent. But the problem still stands that the parser won't load/parse the DTD, and the delegate will have to handle it. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSToolbar: notification of change?
On Jun 1, 2009, at 4:53 PM, David Reitter wrote: Having subclassed NSToolbar, I am now trying to get a notification of changes done by the user using the customization palette. This works fine for the removal of items (toolbarDidRemoveItem:), but I can't see a way to get notified of added/moved items after the fact. The only notification I can get is toolbarWillAddItem:, but that's obviously before the addition, which is not very helpful. I have tried implementing insertItemWithItemIdentifier: and also setConfigurationFromDictionary:, but it seems that the palette doesn't go through these. Short of regularly monitoring the tool bar for possible changes, I don't know what to do... There is no built-in way to do what you want that I know of. There may be third-party subclasses or substitutes, but none that I recall. You can know when the customization palette is invoked, so all you need to check for is when it is closed and then check for changes. You could take a snapshot at -runCustomizationPalette:, then set a timer that checks -customizationPaletteIsRunning until it returns NO, at which time you check for changes. You are still polling, but at least it is relatively lightweight. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Cocoa Bindings and Dependent Keys question
On May 30, 2009, at 2:18 PM, Kelvin Chung wrote:
I seem to have a very simple question, but the answer is eluding me
for some odd reason, but here goes:
Suppose I have two NSArrayControllers, ac1 and ac2. Suppose now
that I have a third controller ac3, whose content array is dependent
on both ac1.selection and ac2.selection (or some keypath therein).
Since I can't bind ac3 to both ac1 and ac2 at the same time, I have
a class which has a dependent key. In particular, suppose I have
the following:
@interface Foo {
IBOutlet NSArrayController* ac1;
IBOutlet NSArrayController* ac2;
}
/* ... */
@end
@implementation Foo
- (id) ac1Selection { return [[ac1 selection] valueForKey:@bar]; }
- (id) ac2Selection { return [[ac2 selection] valueForKey:@baz]; }
+ (NSSet*) keyPathsForValuesAffectingAc3ContentArray {
return [NSSet setWithObjects:@ac1Selection, @ac2Selection, nil];
}
The +keyPathsForValuesAffectingKey is, at least in theory, correct,
but it won't work. You will never receive KVO notifications when the
selection changes. Instead, why not just observe selectedObjects of
each array controller, and in -
observeValueForKeyPath:ofObject:change:context: send willchange/
didchange for the ac3ContentArray key?
- (NSArray*) ac3ContentArray {
/* Do stuff using -ac1Selection and -ac2Selection */
}
@end
Keary Suska
Esoteritech, Inc.
Demystifying technology for your home or business
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Re: Core data, bindings and multiple view NIB
On May 27, 2009, at 10:07 PM, Tomaž Kragelj wrote: Thanks Keary, this works, however it requires that the same binding is repeated in each nib where the same list should be handled (some views may only need to show it while others can also modify it). I was thinking of creating a master set of controllers in the main nib, then bind the slave controllers in particular view nib file to the values from the corresponding master controller. Is that possible, or is it not how bindings should be used? It is possible, and is within the domain of issues that bindings help solve, but I don't see how it would change having multiple repeated bindings. In fact, it adds a useless layer onto the problem. On 27.5.2009, at 22:43, Keary Suska wrote: On May 27, 2009, at 12:30 AM, Tomaž Kragelj wrote: GroupItemsController: - managed object context - Application.delegate.managedObjectContext - ??? The question marks are what I'm missing - if I don't bind to anything, then the array controller will simply show all items for all groups, however I want to bind this to the GroupItemsController from the MainMenu.nib (it is accessible through the Application.delegate, but I don't know how to bind it in order to show only the items selected by the group in GroupsView.nib... Have you tried Application.delegate.GroupController.selection.items (the last key os whatever relationship you need to use)? Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Core data, bindings and multiple view NIB
On May 27, 2009, at 12:30 AM, Tomaž Kragelj wrote: GroupItemsController: - managed object context - Application.delegate.managedObjectContext - ??? The question marks are what I'm missing - if I don't bind to anything, then the array controller will simply show all items for all groups, however I want to bind this to the GroupItemsController from the MainMenu.nib (it is accessible through the Application.delegate, but I don't know how to bind it in order to show only the items selected by the group in GroupsView.nib... Have you tried Application.delegate.GroupController.selection.items (the last key os whatever relationship you need to use)? Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Core data, bindings and multiple view NIBs
On May 26, 2009, at 5:21 AM, Tomaž Kragelj wrote: I'm (again) banging my head with a single window, multiple views app using core data. Each of my view is implemented within it's own NIB and handled by a NSViewController subclass. The views share the same data from the same MOC. Using the following core data model I cannot bind the data as I want: Group --- Item My intention is to show the list of items that belong to selected group. To do that, I add two NSArrayControllers to MainMenu.nib and setup their bindings, then expose the controllers through IBOutlet to my app delegate. This works as expected. Then I use a separate NIB with the view which handles the list of all groups. It also contains it's own NSArrayController instance (dragged from the palette) which is bound to the master controller from the app delegate. This works, it even supports binding the selection. However I'm not able to do the same for the items view (again in it's own NIB, handled by it's own NSViewController subclass) - the closest solution I came to was that ALL items for ALL groups were shown, however adding new ones (saving actually) failed since their group relation was not set... I'm sure I'm missing something, can someone point me to a proper direction? How are you binding the item array controller? It has to be bound to the group list array controller or to a property of the app delegate that depends on its selection. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSURLConnection set to cache
On May 17, 2009, at 9:07 PM, Eric E. Dolecki wrote: I just want to be sure of something - if I set the images to cache, when I load the same url again, the image is coming from memory - because I put in a progress bar and the images loaded already I thought would have an instantly populated progress bar, but they still load with progress (albeit quicker). If you are using the default cache policy, there is no guarantee whether the resource is in memory, on disk, or will be reloaded from its remote source (although you could make a reasonable assumption on the latter). Also, the cache is always validated in these cases, so there will always be some latency. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Special requirements for the window param of NSAlert beginSheetModalForWindow?
On May 13, 2009, at 9:07 PM, Michael Ash wrote: 3) Use performSelector:withObject:afterDelay: with a 0 delay to run the code to show the new sheet after the old sheet has truly gone away. This will result in one sheet being followed by another sheet as you desire. I have had success with successive sheet display by calling -orderOut: or -close: on the sheet before displaying the next. This is also documented as the proper way to display successive sheets. On May 13, 2009, at 10:27 PM, Sean McBride wrote: Your advice is good, to be sure, but you are incorrect about the above. In fact, the 'do you want to replace?' question is displayed in a sheet that appears on top of the save panel sheet. Yes, but the docs are clear that stacked or nested sheets are not supported, and violate HIG. It also doesn't work well if you try to force it. Best, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: [Newbie] Binding an NSArrayController with/without NSObjectController
On May 14, 2009, at 5:51 AM, malte.phil...@mac.com wrote: Now here is what has me utterly confused and my actual question: In his tutorial Scott is setting up an NSObjectController (named ControllerAlias there) and binds that to the MyController instance with the explanation: quoteThis little green box is your bridge between the code in MyController.m and the bindings system./quote The two NSArrayControllers afterwards are bound to that 'ControllerAlias' NSObjectController. Aaron in his book has me creating an NSArrayController and bind that directly to the instance with the array to be controlled. Essentially skipping the NSObjectController entirely. When I just thought it was my bridge to the bindings system? I would really like to understand the difference in approach between these two methods and also if there are any implications by using or skipping an NSObjectController in between. Would anyone find the time and inclination to explain this to me, please? Well, these two examples do not solve the same problem, so compare/ contrast would not be useful. You need to understand the Model-View- Controller (MVC) pattern as it is used in Cocoa. You will find this the docs (just search for cocoa patterns and I bet you'll find it easily). NSController and its subclasses (which include NSObjectController and NSArrayController) were designed to be the C in this pattern specifically for bindings. Have you read Cocoa Bindings Programming Topics? Additional info I would add: the important difference between the two examples is that Scott's uses a tiered approach (common for master- detail interfaces, for instance, in their simplest form), where one controller provides the content for another controller, while Aaron's is the more straightforward single-controller approach (although iterate, these aren't approaches to the same problem, but approaches to different problems). Note also the purpose of NSObjectController vs NSArrayController. As the name implies, the former is for binding to a single object, while the latter is for binding to an array of objects. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Hide/Show Password
On May 14, 2009, at 9:40 AM, Patrick Neave wrote: I would like to add a little button next to my apps password field to hide/show the password. I have searched this list but although it has bee mentioned I can find no example of doing this. NSSecureTextField seems to be the way to go but I am not having any luck. A tabless/borderless NSTabView? Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: [Newbie] Binding an NSArrayController with/without NSObjectController
On May 14, 2009, at 11:07 AM, malte.phil...@mac.com wrote: To possibly refine my initial question a bit better though: In Scott's example I can *remove* the NSObjectController and bind the NSArrayController (he's binding to that NSObjectController) *directly* to the MyController instance in IB. And from my testing: it's still working exactly the same. So I'm still not sure why the NSObjectController is placed in between there. What is its purpose? Allow me the little sketch to illustrate my point: Scott's tutorial) ControllerInstance --- NSObjectController --- NSArrayController --- NSArrayController Alternative) ControllerInstance --- NSArrayController --- NSArrayController What's that NSObjectController in Scott's example for and what is it doing that will not happen in the Alternative binding approach? I haven't reviewed both examples in detail, but the most likely answer is no difference at all. You should be able to--adjusting the bindings appropriately in each case--remove the NSObjectController from the first example and insert one into the second example, without any change in behavior. I have seen a number of examples from Apple that use NSObjectControllers in this way, so it may a situation of convention, but also refer to Quincy's response. I would add that an otherwise useless NSObjectController is particularly useful in cases where the File's Owner maintains the model data. Binding to File's Owner may create retain cycles, so in these cases I have the owner offload the data-binding to an object controller. I also find them useful in Interface Builder as the app will maintain a list of keys and auto-suggest keys when specifying bindings. I wouldn't recommend using the class for just this purpose, but NSObjectController does have its uses. Best. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSTextView delegate methods in NSTextView subclass.
On May 6, 2009, at 3:35 AM, Тимофей Даньшин wrote: I have subclassed NSTextView and I am using that subclass as a field editor for an NSTextField. On certain events in the field editor, i need to take certain actions again in the field editor, and as of now i have to use delegate methods in the TextField's delegate to call methods in the TextView, even though the messages that call those delegate methods, originate in the TextView. Is there a way to receive the notifications on those events (triggering the delegate methods) in the NSTextView subclass? The one I am particularly interested in is -controlTextDidChange; Any delegate method that takes an NSNotification as its sole argument is just a notification. Check the documentation for the notification name and simply observe for the notification. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSXMLParser frees itself on error?
On May 1, 2009, at 12:59 AM, Mike Manzano wrote:
I have an NSXMLParser doing parsing the contents of a URL. It is
allocated like this:
_showsParser = [[NSXMLParser alloc] initWithContentsOfURL:url];
Given a good URL to a parsable XML document, its
parserDidEndDocument: method calls this method:
- (void) cleanupShowParsing {
[_buildingShows removeAllObjects];
[_showsParser abortParsing];
[_showsParser release];
_showsParser = nil;
_currentlyBuildingShows = NO;
}
Note that the parser is aborted and released in here. This seems to
work just fine, multiple times, with no problems. However, if I give
it a URL to non-XML data (should be a 404 page somewhere), it calls
parser:parseErrorOccurred: as expected. This method also calls -
cleanupShowParsing. However, when it is called from here, the
program eventually terminates with:
2009-04-30 23:53:52.573 Revision3[49280:20b] PARSE ERROR: Error
Domain=NSXMLParserErrorDomain Code=5 Operation could not be
completed. (NSXMLParserErrorDomain error 5.)
objc[49280]: FREED(id): message shouldContinueAfterFatalError sent
to freed object=0xf305a0
I have verified that 0xf305a0 is indeed _showsParser. Further, I've
verified that if I don't release _showsParser in -
cleanupShowParsing, no error occurs given a non-XML file.
My question is it the case that NSXMLParser frees itself if it
encounters an error, but does NOT free itself on a successful parse
of a document?
No Cocoa object (or Objective-C object, for that matter) instance will
release itself to the point of deallocation (except in certain
circumstances of a failed -init). To do so would violate memory
management and object ownership. Something to keep in mind.
If I may propose a rule: never deallocate an object from one of its
delegate method calls unless it is documented as specifically
allowable. You don't know whether the object is complete and won't
call any of its own methods right after the delegate call. So, don't
call -cleanupShowParsing in -parser:parseErrorOccurred:, call it only
from parserDidEndDocument:.
HTH,
Keary Suska
Esoteritech, Inc.
Demystifying technology for your home or business
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Re: Crashing resetting or releasing an NSManagedObjectContext
On May 4, 2009, at 11:59 AM, Alexander Spohr wrote: You are still having the same error. Although the advice is sound, the premise is false. All your objects in the relationships are fetched. Therefore they are owned by the NSManagedObjectContext. You kill the NSManagedObjectContext by releasing it. After that point you are not allowed to touch any of its fetched objects. But you hand them out inside the NSDictionary. The code provided doesn't, in fact, touch the MO after releasing the MOC. Pleas reconsider my first tip and let the calling method create the NSManagedObjectContext. Use that to fetch all your objects, process them and _then_ kill your NSManagedObjectContext. An NSManagedObject can not live without its NSManagedObjectContext. The NSManagedObjectContext ist the bucket that holds it. You can not take it out and throw the bucket away. Will not work. A good practice, and something the OP is actually doing. As long as each property is being copied as the OP indicated, the dictionary *only* contains copies of managed object properties, which are therefore owned by the caller and *not* by the MO or MOC. So, releasing the context should not make any difference, as it is released after the MO is processed (by coping its properties) as you recommend. Am 01.05.2009 um 10:24 schrieb Daniel Kennett: NSManagedObjectContext *context = [[NSManagedObjectContext alloc] init]; Pet *pet = [KNClarusQuickDocumentParser petAtURL:url inContext:context]; NSMutableDictionary *dict = [[NSMutableDictionary alloc] init]; [dict setValue:[[[pet valueForKey:@name] copy] autorelease] forKey:@name]; [dict setValue:[[[pet valueForKey:@birthday] copy] autorelease] forKey:@birthday]; // More copying of strings and dates [..] [dict setValue:[[[pet valueForKey:@pertinentActions] copy] autorelease] forKey:@pertinentActions]; // --- Here [context release]; ^ this release kills all fetched objects. Very true. return [dict autorelease]; ^ this dict contains dead objects. Probably false, unless there is missing code that violates the rule. In any case, this issue is likely irrelevant based on when the crash occurs and for what object(s). Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Crashing resetting or releasing an NSManagedObjectContext
it all up.
I use this code for my Quicklook plugin, and in parts of my app
for previewing documents in a more advanced manner than
Quicklook provides.
This is how I set up my ManagedObjectContext:
+(Pet *)petAtURL:(NSURL *)url {
NSManagedObjectModel *managedObjectModel =
[KNClarusQuickDocumentParser managedObjectModel];
NSPersistentStoreCoordinator *coordinator =
[[[NSPersistentStoreCoordinator alloc]
initWithManagedObjectModel:managedObjectModel] autorelease];
[coordinator addPersistentStoreWithType:NSSQLiteStoreType
configuration:nil
URL:url
options:nil
error:error];
NSManagedObjectContext *moc = [[NSManagedObjectContext alloc]
init];
// ^ Not Autoreleasing here. It's the responsibility of the
caller to release the MOC. Autoreleasing causes crashes.
[moc setPersistentStoreCoordinator:coordinator];
[[moc undoManager] disableUndoRegistration];
NSError *fetchError = nil;
NSArray *fetchResults;
NSFetchRequest *fetchRequest = [[[NSFetchRequest alloc] init]
autorelease];
NSEntityDescription *entity = [NSEntityDescription
entityForName:@Pet
inManagedObjectContext:moc];
[fetchRequest setEntity:entity];
fetchResults = [moc executeFetchRequest:fetchRequest
error:fetchError];
if ((fetchResults != nil) ([fetchResults count] == 1)
(fetchError == nil))
{
NSManagedObject *pet = [[fetchResults objectAtIndex:0] retain];
return [pet autorelease];
}
return nil;
}
And this is how I get the data out and release it:
Pet *pet = [KNClarusQuickDocumentParser petAtURL:url];
// Copy out some data.
NSManagedObjectContext *context = [pet managedObjectContext];
if (context) {
[context reset]; // This call results in EXC_BAD_ACCESS
[context setPersistentStoreCoordinator:nil];
[context release];
}
return [dict autorelease];
End code
Different combinations of trying to do this right result in
crashes at different points. Leaving out [context reset] and
just releasing it obviously gives EXC_BAD_ACCESS again.
Autoreleasing the MOC in +petAtURL: causes crashes when the
autorelease pool pops. The only way I can get it to not crash is
to -init the MOC and never release or autorelease it, but that's
causing memory leaks!
Is there a good example anywhere of how to set up and tear down
a Core Data document correctly?
Keary Suska
Esoteritech, Inc.
Demystifying technology for your home or business
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Re: Crashing resetting or releasing an NSManagedObjectContext
in any reply you send. ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/atze%40freeport.de This email sent to a...@freeport.de ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/cocoa-dev%40esoteritech.com This email sent to cocoa-...@esoteritech.com Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Crashing resetting or releasing an NSManagedObjectContext
On Apr 29, 2009, at 2:59 AM, Daniel Kennett wrote: Different combinations of trying to do this right result in crashes at different points. Leaving out [context reset] and just releasing it obviously gives EXC_BAD_ACCESS again. Autoreleasing the MOC in +petAtURL: causes crashes when the autorelease pool pops. The only way I can get it to not crash is to -init the MOC and never release or autorelease it, but that's causing memory leaks! The most common cause if this error is an over-release. Turn on zombies and see who (if any) is being over-released. The culprit could be in your copy data code, that you don't provide. There doesn't seem to be anything obviously wrong (other than explained below), that I can see. Is there a good example anywhere of how to set up and tear down a Core Data document correctly? I can say that the design you present is flawed according to OOP rules, specifically how you release the managed object context. An object should never release an object it doesn't own or has retained. I understand why you are doing this--I am just saying it is a flawed approach. I don't know what the KNClarusQuickDocumentParser class does in its entirety, but it may call for a singleton pattern or at least a shared object pattern (not a proper pattern name AFAIK, just mentioning the technique, for instance, [NSNotificationCenter defaultCenter]). Tear down, in your case, should be as simple as releasing the MOC. The other calls (-reset etc) are unnecessary. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Group Identity Programming
On Apr 29, 2009, at 7:36 AM, Jessica Billings wrote: The third thing I tried is getting the gid using: gid_t curGroupID = getgid(); OR int curGroupID = getgid(); CBGroupIdentity *groupIdentity = [CBGroupIdentity groupIdentityWithPosixGID:curGroupID authority:[CBIdentityAuthority defaultIdentityAuthority]]; When I try to show the gid using NSLog, it hangs the program. When I show the groupIdentity object, it returns (null). The above is better. What does the debugger show for curGroupID? There is no reason to hang on NSLog if for curGroupID, as it is really juts an unsigned int. What is the NSLog code you are using? Thank you for your help! The reason NSLog was hanging is that I was using the wrong formatting token. When I use: NSLog(@current group id: %i, curGroupID); I get current group id: 1612776775, which I'm assuming is right. However, I am still getting Current group info: (null) when I do: That is certainly an odd GID, but I suppose it could be. Leopard changed everything again, so who knows. Anyway, remember that there is no correspondence between the Unix user/group management and the Mac OS X system user management. It is possible that the Unix-based means of acquiring UIDs and GIDs doesn't work with the Mac's way of doing things. Check your values against what you expect them to be. To get the UID and GID for a user, right-click on the user in the system accounts pane (system prefs), choosing advanced options. I would also check the getuid() call and see if it returns the expected UID. This will tell you whether the C calls know about Mac user handling. CBGroupIdentity *groupIdentity = [CBGroupIdentity groupIdentityWithPosixGID:curGroupID authority:[CBIdentityAuthority defaultIdentityAuthority]]; NSLog(@Current group info: %@, groupIdenditity); Unfortunately, I don't know if solving this problem will solve my ultimate problem (although I'm sure it will help!). My ultimate problem is that I have a number of group identities chosen by the identity picker. I need to look at their member lists and see if the logged-in user is in any of those lists. What I can't figure out is how to get access to the member lists of the groups that I get using the identity picker. I think this has to do with the fact that the identity picker returns CBIdentity objects, but how would one make a CBGroupIdentity object using the information from the CBIdentity object for a particular group identity? The only way I can see to make a CBGroupIdentity object is using the above code, but as the documentation If the getgid/getuid functions don't work, I don't know what to tell you. You could try digging into the new user management system (man dscl), or NSTask to the id utility (man id). HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Group Identity Programming
On Apr 28, 2009, at 8:58 AM, Jessica Billings wrote: I am trying to write a program that, among other things, generates a list of user and group identities using the identity picker and then checks to see if the logged-on user matches any user identity or is a member of any group. I can do the first task, but I am having trouble with the group identity part. My main issue, I believe, is that I cannot get to the group-specific attributes (gid and members). I have tried the function identityWithName:authority: two different ways: CBGroupIdentity *groupID = [CBGroupIdentity identityWithName:[tmpArray objectAtIndex:i] authority:[CBIdentityAuthority defaultIdentityAuthority]]; CBGroupIdentity *groupID = [CBIdentity identityWithName:[tmpArray objectAtIndex:i] authority:[CBIdentityAuthority defaultIdentityAuthority]]; Why do think this would work at all? It is not consistent with the documentation. -identityWithName:authority: returns a CBIdentity object, not a CBGroupIdentity object. So of course it will not respond to CBGroupIdentity instance methods. The tmpArray objectAtIndex:i is an NSString representation of the group's name, but I have also tried it with the UUID. This gives me the warning initilization from distinct Objective-C type. When I try to call members or posixGID on either of these, the program hangs. This should have been the first clue that you're doing something wrong. Also, I have tried to just circumvent creating a group identity and get to the heart of the matter by doing the following, using a test group I generated myself on the local machine (the other groups were made by someone else and are not local groups): NSString *user = NSUserName(); CBIdentity *localIdentity = [CBIdentity identityWithName:user authority:[CBIdentityAuthority defaultIdentityAuthority]]; [localIdentity isMemberOfGroup:[CBGroupIdentity identityWithName:@test_group authority:[CBIdentityAuthority localIdentityAuthority]]]; Except that you aren't circumventing anything, you are juts doing the same wrong thing: [CBGroupIdentity identityWithName:@test_groupauthority:[CBIdentityAuthority localIdentityAuthority]]. You cannot get a group identity this way. The third thing I tried is getting the gid using: gid_t curGroupID = getgid(); OR int curGroupID = getgid(); CBGroupIdentity *groupIdentity = [CBGroupIdentity groupIdentityWithPosixGID:curGroupID authority:[CBIdentityAuthority defaultIdentityAuthority]]; When I try to show the gid using NSLog, it hangs the program. When I show the groupIdentity object, it returns (null). The above is better. What does the debugger show for curGroupID? There is no reason to hang on NSLog if for curGroupID, as it is really juts an unsigned int. What is the NSLog code you are using? Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSArrayController: Objects with empty strings
On Apr 28, 2009, at 8:59 AM, MyApps wrote:
First off, a suggestion: please don't delimit code sections like you
do. In fact, you don't need any delimiters other than whitespace (as
you can see with the edited text below). And you can see, it is just
as readable, and, IMHO, it is actually *more* readable.
Anyway, on the the question...
If I do this:
NSMutableDictionary *theDicRow = [NSMutableDictionary
dictionaryWithObjectsAndKeys:
@Text A, @colA,
@, @colB,
nil ];
The result is:
[2355:10b] (
{
colA = Text A;
}
)
But I wanna have the empty string back. So it seems, that the empty
string is converted to nill and the controller is killing them out.
How can I change this reaction with empty strings? I need this @
Strings.
I am not surprised to see this behavior, for various reasons. The
short answer is no, you can't have an empty string for a key in
conjunction with an NSArrayController. What would be the key path for
an empty string?
Keary Suska
Esoteritech, Inc.
Demystifying technology for your home or business
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Re: NSArrayController: Objects with empty strings
On Apr 28, 2009, at 1:39 PM, Alexander Spohr wrote: Am 28.04.2009 um 21:22 schrieb Keary Suska: NSMutableDictionary *theDicRow = [NSMutableDictionary dictionaryWithObjectsAndKeys: @Text A, @colA, @, @colB, nil ]; I am not surprised to see this behavior, for various reasons. The short answer is no, you can't have an empty string for a key in conjunction with an NSArrayController. What would be the key path for an empty string? As a note: the code sets the value to the empty string. The key is colB. It pays to pay attention. Sorry for that. Anyway, I am still not entirely surprised, as the GUI doesn't distinguish between empty and nil values. At least as far as an NSTextField/Cell is concerned. I would be curious whether there is a binding to the value, and if unbound, the behavior remains. I have had to deal with this situation particularly as it related to RDBMS's, which *do* distinguish between NULL and and empty, and it's an important distinction. In cases where you know you will need to handle an empty value and you want to make sure it will *never* be nil, you can use a transformer. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSTextField notification if selection changed
On Apr 27, 2009, at 11:48 AM, David Alter wrote: How can I get notification if the Selection changed in a NSTextField. This works with a NSTextView by setting up the delegate - (void)textViewDidChangeSelection:(NSNotification *)aNotification A NSTextField uses a NSTextView for its editing. And the NSTextField is the delegate to the NSTextView. If I need to get the selection changed should I be subclassing NSTextField and placing the textViewDidChangeSelection delegate method in there. Or is there a simpler solution to this. Once you get a reference to the field editor, you can observe its NSTextViewDidChangeSelectionNotification. Best, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: problems with live resize of NSTextView
On Apr 24, 2009, at 3:06 PM, Stuart Malin wrote: I have an NSTextView in a custom view, it is set to resize with the containing view only in the horizontal dimension. When I resize the window, the text view does resize, and it does re-layout its content to fit, both on expanding and shrinking. However, the text view not only changes its frame size height, but repositions itself (changing the y value of its frame's origin). Why does it do this? You need to read the Cocoa Drawing Guide and View Programming Guide for Cocoa. The answer is explicit: the 0,0 coordinate of the Cocoa drawing system is the bottom left. More important to me: where is the best place for me to detect this change because I want to change the parent view's height to accommodate any increase in height in the text view. One possible approach is to observe NSViewFrameDidChangeNotification coming from the view. See the NSView documentation for how to use it. Best, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: undoMenuTitleForUndoActionName
On Apr 25, 2009, at 10:49 AM, norio ota wrote: I need to localize the undo menu title. I made the subclass of NSUndoManager and overrode two methods: undoMenuTitleForUndoActionName and redoMenuTitleForUndoActionName. Bun they don't get called. Would you tell me who calls the functions and , if possible, how I should do to localize the titles instead of general ones? The issue, in your particular case, is probably more of an issue of how to get various parts of Cocoa to use your NSUndoManager subclass. Is there a reason that -setActionName: won't work? I imagine it could be rather awkward grammar in some languages, but it would be a lot easier. Otherwise, IIRC, all controls will use the Window's undo manager, so if you have the window delegate implement - windowWillReturnUndoManager:, you can force the use of your subclass. Best, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: problems with live resize of NSTextView
On Apr 25, 2009, at 12:05 PM, Stuart Malin wrote: On Apr 25, 2009, at 5:08 AM, Keary Suska wrote: On Apr 24, 2009, at 3:06 PM, Stuart Malin wrote: I have an NSTextView in a custom view, it is set to resize with the containing view only in the horizontal dimension. When I resize the window, the text view does resize, and it does re- layout its content to fit, both on expanding and shrinking. However, the text view not only changes its frame size height, but repositions itself (changing the y value of its frame's origin). Why does it do this? You need to read the Cocoa Drawing Guide and View Programming Guide for Cocoa. The answer is explicit: the 0,0 coordinate of the Cocoa drawing system is the bottom left. Ah, I wasn't clear, because of course the origin would move down as the text expands downward. What I am seeing though is that the origin moves down more than the increase in height, so the text view isn't just expanding, but expanding and moving downward (that is, even its top moves down). Is the NSTextView anchored to both the top and bottom edges? If not, you may get this behavior. More important to me: where is the best place for me to detect this change because I want to change the parent view's height to accommodate any increase in height in the text view. One possible approach is to observe NSViewFrameDidChangeNotification coming from the view. See the NSView documentation for how to use it. Thanks for reminding me of this. I need to see whether the notification occurs before a redraw cycle. If so, I can propagate relevant resizes up the chain of parent views. It would probably be better to put the textview in a scrollview (or make the textview's parent an NSScrollView subclass). You wouldn't, for instance, want the window to grow larger than the screen size. Best, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Bindings making NSNumberFormatter strange
On Apr 22, 2009, at 6:24 PM, Ulai Beekam wrote: So I really must make a custom field editor to accomplish on-the-fly validation (i.e. disallowing on-the-fly invalid characters)? It is not your only choice, but it is probably the best choice. Another poster suggested using isPartialStrignValid of the formatter, but I have tried this in the past and run into undo issues, particularly when using it to filter input. The problem is that undo registration happens before the validation call, and somehow the undo typing feature remembers the string, so when you change the string in the validator method, and then undo, you can get add results and out- of-bounds exceptions. Since then I haven't looked into why this happens and how to get around it, if at all possible. I suppose I could do a custom field editor and override keyDown:, checking for characters in [NSCharacterSet decimalDigitCharacterSet], etc. In fact, having made some custom field editors in the past I know I would be able to do this. However, I consider this to be a somewhat lame hack :( I therefore want to make sure with you guys that there is no easier solution to this, e.g. to somehow use the number formatter as a basis for automatic on-the-fly validation. I think that is exactly what you want to do, and doesn't sound like a lame hack to me. But someone else may have better advice. There is a solution that seems to me a bit of a hack, but works in a pinch: implement the -controlTextDidChange: delegate method, and in that method check for invalid characters, and if found, beep, clean them out, then set the fields value to the cleaned string. The whole thing just seems strange to me. Because when the text field is not bound, on-the-fly validation seems to work just fine! But this great feature goes away as soon as the text field is bound. That is, as soon as the text field is bound, the validation stops being on-the-fly and goes elsewhere instead. Is there no way having the validation ALSO as an on-the-fly thing? H. I am not sure what you are describing here. Did you check continuously updates value in the binding? Best, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Bindings making NSNumberFormatter strange
On Apr 23, 2009, at 2:25 PM, Lee Ann Rucker wrote: It is not your only choice, but it is probably the best choice. Another poster suggested using isPartialStrignValid of the formatter, but I have tried this in the past and run into undo issues, particularly when using it to filter input. The problem is that undo registration happens before the validation call, and somehow the undo typing feature remembers the string, so when you change the string in the validator method, and then undo, you can get add results and out- of-bounds exceptions. Since then I haven't looked into why this happens and how to get around it, if at all possible. There's no workaround. I tried writing my own Undo handler, but as you've discovered the changes happen before there's a chance to handle them. Formatters work, and bindings work, but the combination doesn't. The only solution I've found is to use a formatter without bindings, since having the formatter is more important than having bindings, useful as they may be. Just to be clear, are you saying that you can do field filtering with a formatter, with appropriate undo support, without bindings, or are you making a general remark about difficulties when using bindings with formatters? Thx, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Bindings making NSNumberFormatter strange
On Apr 22, 2009, at 3:57 PM, Ulai Beekam wrote: To elaborate, when not using bindings, the default behavior of text fields with a number formatter is that when a user tries to enter abc in it, the text field refuses to lose focus and makes a beeping sounds. However, when the text field's value binding has been set, a sheet is shown, which I think is a bad user experience. That's because no one is handling the error. Bindings gives you some automatic error support. Otherwise you have to handle the error yourself. This is well documented. If you don't like the experience, then change it. In fact it would be even better to just disallow entering of invalid characters in the first place. But such a method would have to work even if the text field's value binding is set. I agree with you that having some sort of built-in support for entry filters would be great (I would add length limiters as well). I think we had this back in the Mac toolbox days, if I am remembering properly. Anyway, there are two different issue to consider. One is validation, and the other is custom editor behavior. They are really two different problems, although there is overlap. My problem is that when I type some invalid stuff in the text field, such as some letters abc, I don't get a beep (which is the normal behaviour and the one I want), but I get some sheet popping up saying Formatting Error. I don't want this sheet. I want the beep like usual. How can I get rid of this sheet behaviour that the bindings is causing? And why is it even causing it? Because that's how formatters work. Getting rid of the sheet is nontrivial if you allow the formatter or bindings to do validation. Also, your formatter (or your model object, using key-value validation) can provide a more sensible error message if you choose. Second question: How can I make my text field just disallow entering of invalid characters in the first place (and producing beep when it is tried)? I want, as you probably guessed, a method that is compatible with bindings. You can use the formatter to check data on the fly, but you have to control the undo manager or you will get exceptions on undo. You can also have a custom field editor, for finer grained control. Both of these have decent documentation. I would be surprised if no-one has a framework that offers some of this behavior. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Select Object in NSDictionaryController
On Apr 19, 2009, at 1:29 AM, Gerriet M. Denkmann wrote: I have a table with two columns, labeled Key and Value bound to myDictionaryController.key and myDictionaryController.value. Now I want to select a row programmatically (e.g. [ myDictionaryController selectRowWIthKey: @someKey ]; ). But such a method I cannot find. There is no such facility, unfortunately. It would be nice. Why not file an enhancement request? And trying to use the inherited selectObjects: does not work (nothing happens, not even an error message). Well, -selectObjects: can't be used to change a controller's selection, so no wonder you aren't getting anywhere. So: how can I select a row in my table? Normally, -setSelectedObjects:, -setSelectionIndex:, or - setSelectionIndexes:. If they don't work, and you want help with that, then be specific about what precisely you tried (i.e. show code!). It also helps to mention what you expect to happen, and what is actually happening differently than your expectation. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Select Object in NSDictionaryController
On Apr 20, 2009, at 11:12 AM, Gerriet M. Denkmann wrote:
NSArray *defs = ...some array... (which is bound to content of
definitionsArrayController)
NSUInteger defIndex = 0;
for( NSDictionary *aDef in defs )
{
for( NSString *defKey in aDef )
{
NSString *value = [ aDef objectForKey: defKey ];
BOOL ok = ... some test with value
if ( !ok ) // select the bad thing
{
[ definitionsArrayController setSelectionIndex: defIndex ]; //
this works fine
// now the table shows aDef and the first row in the table is
selected
[ myDictionaryController setSelectedObjects: [ NSArray
arrayWithObject:
This doesn't work because the selected object(s) need to be the actual
objects managed by the controller.
This code works (but seems incredibly complicated and inefficient):
NSArray *arrangedObjects = [ dictController arrangedObjects ];
id theThing = nil;
for( id something in arrangedObjects )
{
NSString *key = [ something key ];
if ( [ key isEqualToString: defKey ] )
{
theThing = something;
break;
};
};
if ( theThing == nil ) // error
{
NSLog(@%s Error not found,__FUNCTION__);
}
else
{
[ dictController setSelectedObjects: [ NSArray arrayWithObject:
theThing ] ];
};
This, or something similar, is probably your best bet. Also, chances
are any other apparently shorter solution would really just do the
same thing.
Best,
Keary Suska
Esoteritech, Inc.
Demystifying technology for your home or business
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Re: Core Data Fetches + Transient Properties + NSPredicateEditor = Sadness
On Apr 16, 2009, at 9:01 PM, Jerry Krinock wrote: The fact that Core Data cannot fetch using a predicate based on transient properties [1] seems to greatly limit the utility of the NSPredicateEditor view, and makes me very sad. For example, say that my objects are student test results with a 'score' attribute and two dozen other properties. I could give the user an NSPredicateEditor and let them have oodles of fun constructing complex predicates. But what if I need the user to be able to set a predicate with a left-side-expression of letter grade and a right-side-expression popup menu showing 'A' - 'F'. If I could fetch based on a transient 'letterGrade' attribute, I could implement some custom accessors which would calculate 'letterGrade' from 'score' as needed, the predicate emitted from the NSPredicateEditor would just work, and life would be sweet. But since I can't use transient properties in my predicate, providing a popup like that in NSPredicateEditor seems to mean that I'm going to have to somehow deconstruct the compound predicate which Apple put so many man-years of engineering into, have Core Data do sub-fetches, then do my own filtering and put the results back together. I fear that writing bug-free code to handle the general compound predicate would be very time-consuming, and also it would be MVC hell with my NSPredicateEditor subclass (view) code wanting to have model logic such as if score 93, letterGrade = 'A'. I am not really up to speed on NSPredicateEditor, but could you use - ruleEditor:predicatePartsForCriterion:withDisplayValue:inRow: to convert the display case of grade = A-F to a predicate that is actually grade = = score range? I imagine you would need to construct a compound predicate with subpredicates (sub-rows). Either that or use the BETWEEN operator. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: C: treated as a path component
On Apr 14, 2009, at 5:57 PM, Dragan Milić wrote: Hell all, Let's suppose I've got NSString @C:omponent , which represents the name of a file. Is there a way to instruct NSString class not to treat a leading single letter followed by a column as a path separator? Namely, I need this one treated as only one path component @C:omponent, but NSString sees two, @C: and omponent. So, if I ask for the last path component, I get @omponent instead of the whole string @C:omponent. I don't believe so, as I believe colon-separators are are deeply ingrained into the file system. You will probably need to parse the path names yourself. Look at one of the regex libraries for easy parsing. Carbon is not dead, it just smells funny. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Programatically creating NSMenu?
On Apr 8, 2009, at 7:13 AM, Daqi Pei wrote: I've been trying to create a Cocoa GUI application without IB. Everything works fine except for the NSMenu. After digging over the internet I found a solution from ' http://lapcatsoftware.com/blog/2007/06', by using some undocumented methods and member variables. I succeeded in creating the application, and what I found interesting is, it seems that if I run the application from Terminal, no menu would be shown (the Windows still work fine). The only way to have the menus working properly is to create an Application.app directory structure, and run from Finder. Apps with static Nibs work fine both running from Terminal and Finder. Again I'm doing this only to understand how the system works. Did I miss something or it's just the way the framework was designed? http://lapcatsoftware.com/blog/2007/05/16/working-without-a-nib-part-1/ Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Programatically creating NSMenu?
On Apr 8, 2009, at 8:53 AM, DairyKnight wrote: Sorry but I don't really see the connection between that page and my question? Sorry, probably answers the wrong question. Anyway, what is the difference between an apps with an Application.app directory structure and apps with static Nibs? If in both cases you have an application bundle, you are halfway to your answer. NSApplicationMain() requires a bundle. It can find its resources even when directly launched via terminal. I expect that using NSApplicationMain() without an app bundle is undefined, and hence the behavior you are seeing. On Wed, Apr 8, 2009 at 9:44 PM, Keary Suska cocoa- d...@esoteritech.com wrote: On Apr 8, 2009, at 7:13 AM, Daqi Pei wrote: I've been trying to create a Cocoa GUI application without IB. Everything works fine except for the NSMenu. After digging over the internet I found a solution from ' http://lapcatsoftware.com/blog/2007/06', by using some undocumented methods and member variables. I succeeded in creating the application, and what I found interesting is, it seems that if I run the application from Terminal, no menu would be shown (the Windows still work fine). The only way to have the menus working properly is to create an Application.app directory structure, and run from Finder. Apps with static Nibs work fine both running from Terminal and Finder. Again I'm doing this only to understand how the system works. Did I miss something or it's just the way the framework was designed? http://lapcatsoftware.com/blog/2007/05/16/working-without-a-nib- part-1/ Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: SQLite and Unicode
On Apr 6, 2009, at 2:31 PM, Тимофей Даньшин wrote: When I insert non-latin strings into my SQLite3 database, they turn into some weird sets of characters (as I select those strings later in Terminal), and the fields, which contain those strings, become unusable by my application. I googled for it for quite a bit, but everywhere it says that SQLite 3 supports utf8, so there is no advice on what should be done in such situations. What can I do about it? Are you properly encoding your C strings with -cStringUsingEncoding:? If so, when you query the column (and properly translate the C string to NSString using -stringWithCString:encoding:), are the characters still mangled? HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Auto Resize Views Issues
On Apr 7, 2009, at 8:22 AM, I. Savant wrote: On Tue, Apr 7, 2009 at 9:56 AM, Rama Krishna vrk.li...@gmail.com wrote: I get the animation all right. However all the sub view sizing and layout is disturbed. Some views appear above other views and so on. What is the proper way to animate a view from zero size to the desired size? I believe this is a known issue with the autoresizing mechanism. Specifically, autosizing behavior does not work correctly when a view has been sized to 0,0. I don't believe there is a workaround for animating the size of your view directly. I would add to this that I found that if views overlapped when their container view was shrunk (to any size that would cause views to overlap, not just to 0), when the container view grows the subviews would get placed in apparently undefined ways. This may be an overlapping views issue. Best, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: SQLite and Unicode
On Apr 7, 2009, at 10:39 AM, Тимофей Даньшин wrote: On Apr 7, 2009, at 8:14 PM, Keary Suska wrote: Are you properly encoding your C strings with -cStringUsingEncoding:? Yes, I think so. At present, I am using the -UTF8String method, but I also tried the - cStringUsingEncoding: to no avail. Here is the line that binds the string to the prepared statement: sqlite3_bind_text(sentence_insert_statement, 1, [string UTF8String], -1, SQLITE_TRANSIENT); and I translate it back into NSString by [string stringWithUTF8String], although I also tried the -stringWithCString: encoding: method. The characters _are_ mangled. And the funny thing is that i am able to add non-latin strings to it by reading sql files from SQLite in Terminal... How do you define string (i.e. how is its value set)? There can be an issue with UTF8 constant strings. Have you called - canBeConvertedToEncoding: to make sure string is utf-8 compatible? Best, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: SQLite and Unicode
On Apr 7, 2009, at 12:54 PM, Тимофей Даньшин wrote: I am deeply and sincerely ashamed of myself. The point is that i get that input string by splitting the string in my textView ([[myTextView textStorage] string]) into sentences. During that procedure i check every char if it is a sentence terminator (?! or linebreak). And i do that by using the - characterAtIndex: method. And the thing is that that method returns wrong characters if it deals with unicode ones. Thanks Keary Suska for pointing that out to me. I will now have to find another unicode-safe way to split the string into sentences. Thanks again for all your help. And if you could give me a hint on how to safely get unicode chars at a given position of a string, I'd be even more grateful :) Apple's String Programming Guide for Cocoa will give you info on how to handle unicode strings. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Bindings and MenuItems
On Apr 1, 2009, at 3:34 AM, Ben Lachman wrote: I have a menu item that is bound to a target. The menu is resides in has Auto Enables Items checked which means that it should call - validateMenuItem on a items target if it is available. However validate is never called on the target. If I remove the binding and set the target to one of the objects manually in IB the validation method is called as expected. Has anyone else run into this and if so, is there a work around? IIRC, I had a situation where I discovered that both target action have to be bound (i.e. key-value binding) or target-action fails entirely. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Bindings and MenuItems
On Apr 1, 2009, at 12:31 PM, Ben Lachman wrote: I mean a Cocoa bindings kind of binding. e.g. the target binding of the menu item is bound in IB. The action field of the binding is set to print:. I'm not talking about the traditional way of connecting a button/menu item to another object through the basic control drag from source to target and select the action method and I'm not talking about setting it in code. I know how to do both of those and they work, what I'm going for is a dynamic target. I think I wasn't recalling correctly--my issue had to do with an NSButton, and binding didn't work for me. There is no reason to suspect that the binding wouldn't work as advertised. Anyway, I suppose you have verified that the correct object is being set when the binding is established (and/or when the bound property changes)? Best, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Delayed Undo Problem
On Mar 30, 2009, at 5:55 AM, Richard Somers wrote: I have a basic core data document based application (Hillegass 3rd Edition, Chapter 11, CarLot). With a single primary window every thing works. Then a second window is added with a generic master detail interface using the core data entity from the Interface Builder pallet. When making a change to the model in the second window, undo/redo in the main menu is not available until the primary window is clicked and brought to the front. I need the undo/redo menu to work regardless of which window is frontmost. Any thoughts as to how this can be done? This FAQ might help: http://developer.apple.com/documentation/Cocoa/Conceptual/CoreData/Articles/cdFAQ.html#/ /apple_ref/doc/uid/TP40001802-244036 Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Porting BASIC text mangling app to Objective-C
On Mar 25, 2009, at 12:06 AM, Ricardo Balderas wrote: I'm starting with a Cocoa Document Based project, but am having trouble with Opening and Saving of documents. The stump comments in MyDocument.m are beyond me still, and I've tried the Building a Text Editor in 15 minutes example, but the opening and saving documents part is a bit outdated and gets confusing. Could you help me with a simple and well explained sample code of how to Open and Save files? Also, how can I make the app save .txt or .rtf files? I managed to make it output . files and read them back, but trying to add other file types (taken from the TextEdit source code) led to problems reopening a saved file. A document-based approach is probably not useful for your example. If you really want to get into file management in Cocoa, refer to the NSFile* classes. At this early stage, I wouldn't bother yet and just look at NSString's -initWithContentsOfFile:encoding:error: and - writeToFile:atomically:encoding:error: and the NSScanner class. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Overriding -dealloc on any object
On Mar 25, 2009, at 7:29 AM, Ryan Joseph wrote: The question is, will it be safe to override methods like initWithObjects: that are owned by Cocoa and created through convenience functions? Will those objects be sent -dealloc also? Second, given the Objective-C runtime should I replace the implementation using class_replaceMethod or do I need to add a new method using class_addMethod? I did observe that -dealloc does indeed have an implementation so I'm not sure class_addMethod will even have any affect, but I'm not sure replace the implementation is safe either. Any help is appreciated. Thanks! I am not entirely certain I am following you but to work with Cocoa (in a non-GC environment) you will need to follow (and expect all Cocoa objects to follow) the Memory Management Guidelines. This document will tell you most, if not all, you need to know about memory management in Cocoa. If you need to essentially override -dealloc that will be inherited by all objects, well, that's tricky, and requires some knowledge and use if Obj-C runtime functions. Beyond me. But then, do you really need that? I don't know what is involved in creating these bridges, but it seems saner to me to maintain your own set of manager objects that then control native Cocoa objects. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Implementing a many-to-many (reflexive) relationship using bindings and an NSTableView
On Mar 25, 2009, at 2:44 PM, Jon C. Munson II wrote: Do you mean here that you will pop up a window that contains an NSTableView that will be used to select rows of Entity B? Correct language is critical. I think most Cocoa developers would assume that popup means NSpopupButton. [Jon C. Munson II] Yes, an NSPopupButton is what I meant to imply here. How would you do that? A popup button may only represent a single value. If you need to represent multiple values, you will need something like mmalc's the checkboxes example or a table view. You should be able to use bindings for everything you describe except for setting relationships between existing objects. That will have to be done in code, AFAIK, but isn't difficult. [Jon C. Munson II] OK. Benjamin Stiglitz responded suggesting I take a look at the ToManyCheckbox example on mmalc's page, so I'll do that and see if that clarifies things. Also, I noticed in the iClass example that code is used to support the relationship and so on. Is that the recommended template implementation to support this type of relation? You might be able to use an array controller whose content is the to- many relationship, calling addObject: with the managed object to add to the relationship, but otherwise the controller wouldn't interact with the UI. At that rate, it is probably better to set the relationship in code. Generally, inserting new objects into a to-many relationship using an array controller is a common method. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSLevelIndicator Bindings Crash
On Mar 23, 2009, at 2:04 PM, Walker Argendeli wrote: Yes, you're right, Item is an NSArrayController representing the entity Item. Sorry about that. ItemsList is an Entity and Array Controller representing an outline view of folders. Each folder can have multiple Items in it. Depending on which folder is selected in the ItemsList outline view, the right Items will appear in the Table view whose columns are bound to properties of the Item array controller. Depending on which item is selected in the Item tableview, the level indicator, which is bound to (the array controller) Item.selection.priority The Item.selection.priority keypath indicates that you are referencing the key Item of the array controller (as you describe). How is that key defined? For some reason though, I get the odd behavior that follows: In the Item table view, if I have one item selected, then select a different one, that new Item will have the levelindicator defaulted back to 1, though it had been set to a different value previously. Are you saying that the level indicator always shows 1, no matter what the bound value is, or that it changes back to the original value after you change it? Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSSegmentedControl send action only from the selected segment
On Mar 24, 2009, at 3:54 AM, Michele Barboni wrote: On Mar 19, 2009, at 10:11 AM, Michele Barboni wrote: Hi, I've a NSSegmentedControl, 7 segments (labeled with weekdays), which has selectedIndex bound through a value transformer (NO reverse transformation) to NSDates. Now, one of my awakeFromNib do this: [sedutaDays setTarget:self]; [sedutaDays setAction:@selector(setWeekDay:)]; [sedutaDays setContinuous:YES]; setWeekDay: essentially change the day of the NSDate which NSSegmentedControl is bound to, by accessing the NSArrayController, selectedObjects:, objectAtIndex:0, and so on.. The problem is that my setWeekDay: action is sent only if I click the selected segment (set by binding), clicking on any of other 6 segments results in an attempt to reverse transform the value, which obviously fail with [NSCFNumber timeIntervalSinceReferenceDate]: unrecognized selector sent to instance 0x1019a40 since my value transformer doesn't reverse.. Any idea why it seems that only selected segments has setAction: ? Passed two last days trying to understand why my NSSegmentedControl has this behavior but nothing came out.. I'm very disappointed.. It is not the behavior of the NSSegmentedControl, but bindings that you are not understanding. The binding is not trying to reverse transform , or you would get a different error message--assuming that your transformer is properly implemented, that is. Refer to: http://developer.apple.com/documentation/Cocoa/Conceptual/CocoaBindings/Concepts/MessageFlow.html#/ /apple_ref/doc/uid/TP40002149-186285 If your transformer does not support reverse transformations, then your setter method must assume that it is receiving a transformed value--in this case, an NSNumber. Does it make this assumption? Note that the segment control would have sent your action method if you didn't get the exception first. Selecting the currently selected segment works because you are not changing the bound value, which is precipitating the exception. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Key path for values in Shared User Defaults?
On Mar 23, 2009, at 1:54 PM, Matthias Arndt wrote:
Please help me: What is the key path of a value stored in the shared
user defaults?
I'm using a sub-classed NSViewController to enhance the print panel
with an accessory view:
NSBundle *appBundle = [NSBundle bundleForClass:[self class]];
NSViewController *accessoryViewController = [[PrintOptions alloc]
initWithNibName:@PrintOptions bundle:appBundle];
[[printOperation printPanel]
addAccessoryController:accessoryViewController];
The view PrintOptions includes three checkboxes, all bind to the
Shared User Defaults Controller. The printed view uses these values
to modify its output. Everything works fine except the preview in
the print panel: It isn't updated when I check / uncheck any of the
boxes, although the view controller conforms to the
NSPrintPanelAccessorizing protocol and should use KVO to be
notified for changes.
I think my keyPathsForValuesAffectingPreview implementation is
wrong as I don't know how to reference a shared user default:
- (NSSet *)keyPathsForValuesAffectingPreview
{
return [NSSet setWithObjects: @PrintFastMode, @PrintJumps,
@PrintGrid, nil];
}
The documentation I found only mentioned an example with document
margins, but what is the key path for properties bind to the user
defaults? Sorry, I'm totally lost ...
OTOH, you could have an outlet to the defaults controller, say, named
defaultsController and use @defaultsController.values.DEFALTSKEY
to keyPathsForValuesAffectingPreview. I think that is supposed to
work...
HTH,
Keary Suska
Esoteritech, Inc.
Demystifying technology for your home or business
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Re: How to draw text with expanded inter-character spacing
On Mar 23, 2009, at 7:20 AM, Fabry, Geza wrote: I would like to draw some text into my custom view wider than usual but not by stretching the glyphs using a transformation but by increasing the spacing between the glyphs (like in Font Character Spacing Spacing Expanded/Condensed in MS Word). Is there an attribute for an NSAttributedString like kATSUAfterWithStreamShiftTag was in ATSUI or any other way to do that? I think what you want is to change the font tracking, but I don't think there is a way to do that easily (no public setting for it). You could try fiddling with font kerning, but that might have an inconsistent look. There is a font manager property called font trait, but I think that requires an actual font variant for condensed, expanded, etc. I don't know if it can be faked. You could fake it by inserting space characters of determined sizes, or scrap the text view do your own thing (which is likely what Word is doing). HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSLevelIndicator Bindings Crash
On Mar 23, 2009, at 1:13 PM, Walker Argendeli wrote: When i do this, however, every time I switch back to another item, the level defaults back to 1. Also, I checked that chapter in Hillegass's book, and it had an example where it used Car.selection.condition, so it seems that selection is the right controller key. The bindings in general are just really funky. I added a stepper and textbox in addition to the level indicator, and bound them to Item.selection.priority, and they too default back to 1 (the default value) every time I go to another item. The Item array controller's Content Set is bound to ItemsList.selection.Item That's the only binding, other than the managed object context. I really can't figure out what's causing this problem, which is annoying because I'm trying to focus on fixing this before I continue development. Your descriptions make no sense. When referencing binding key paths, make them relative to the controller, and not to the model. I assume that when you say Item.arrangedObjects.priority you really mean NSARRAYCONTOLLER.arrangedObjects.priority. This is a critical distinction, as the two paths are nowhere near the same. Ok, so you have an entity Item, and you have an NSArrayController with Content Set bound to ItemsList.selection.Item. What is ItemsList, and why does it exist? What controller is providing content to the table view? Generally the proper approach is: 1. array controller with bound MOC that either performs its own fetch or is populated programmatically; 2. tableview bound (technically, columns are bound) to that array controller; 3. detail items (level indicator and stepper) bound to arraycontroller.selection.property (where arraycontroller is the controller specified in #1). That should be all there is to it. On Mar 22, 2009, at 10:05 AM, Richard Somers wrote: On Mar 21, 2009, at 3:41PM, Walker Argendeli wrote: I'm using Core Data, and I have an entity; we'll call it Item. It has an attribute called priority. In the xib, I have an NSLevelIndicator and NSStepper. I have a NSTableView full of Items. Depending on which item is selected in the table view, I want the level indicator and stepper to display the right values, and for me to be able to set them to a certain value for each item. There are 2 problems: If I bind the value of either one to Item.arrangedObjects.priority, the app throws an exception, whereas if I bind to Item.selection.priority, the controls don't set each item's priority individually. What should I bind to? Secondly, an NSLevelIndicator wants a float for its value, whereas an NSStepper wants a double for its value. Which should I set it to in the core data model? Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Is it a Value or an Object ?
On Mar 21, 2009, at 7:57 AM, Jerry Krinock wrote: On 2009 Mar 21, at 06:46, Luca C. wrote: Essentially they are the same, but the word value fits nicely with KVC. Yes, but setObject is usually used for dictionaries, although there is the variant -setValue:forKey: which handles nil objects, unlike -setObject:forKey: which raises an exception. Is there a method to the madness? -setValue:forKey: is not a variant of -setObject:forKey:. - setObject:forKey: is the method for setting the object for a specific key in an NSMutabelDictionary. -setValue:forKey: is a method declared by the NSKeyValueCoding informal protocol implemented in NSObject that sets a property value for any NSObject subclass. There is not likely anything more special in the naming use than that. In fact, the docs for NSMutableDictionary's setValue:forKey: say: This method adds value and key to the receiver using setObject:forKey:, unless value is nil in which case the method instead attempts to remove key using removeObjectForKey:. Best, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Bindings: which object+property is being edited?
On Mar 17, 2009, at 2:18 PM, Jim Correia wrote: Given an NSObjectController subclass, or an NSManagedObjectContext (with chained controllers), is it possible to determine the set of objects + properties currently being edited? The NSEditorRegistration protocol is untyped: - (void)objectDidBeginEditing:(id)editor; - (void)objectDidEndEditing:(id)editor; and the editor is often an instance of a private class. IIRC you can determine which view is being edited (i.e. what view an editor is associated with), but I don't believe Cocoa has any concept of properties being edited. If you can get the view, you can inspect its bindings, but that seems a rather roundabout way to do something that might have a smarter approach. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: How to create an NSDecimal?
On Mar 14, 2009, at 6:32 PM, Michael Ash wrote: On Sat, Mar 14, 2009 at 6:55 PM, Keary Suska cocoa-...@esoteritech.com wrote: On Mar 14, 2009, at 2:35 PM, Ashley Clark wrote: I don't see NSDecimalFromString() in any of the docs or header files, only NSDecimalString() to create strings. Where is that defined? It's part of Foundation, defined in NSDecimal.h. It's not in any of the copies of NSDecimal.h on *my* system (10.5.6) Hmm, I can't find it either. Anyway, this was a function in NSDecimal.h that was part of NextStep that is still part of GnuStep, but must have been removed by Apple at some point. Sorry, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSProgressIndicator's setUsesThreadedAnimation only works sometimes?
On Mar 13, 2009, at 4:20 PM, Sean McBride wrote: Hi all, I'm trying to make a cheap, modal, indeterminate progress dialog, but I'm having trouble animating the progress bar. (Yes, I know this is only slightly better than the spinning wheel of death. Yes, I know I should thread my long running code. Yes, I know I should not block the main thread. One day...) The docs for NSProgressIndicator's setUsesThreadedAnimation say This value is only a hint and may be ignored. Indeed, sometimes it animates and sometimes it does not. I can't find any pattern. Is there a way to reliably make an NSProgressIndicator animate while the main thread is blocked? I have had success using -beginModalSessionForWindow: and an NSTimer that calls a method that checks for an end condition and calls - runModalSession:. I have mostly used this in cases where I needed asynchronous behavior but I need to block the UI. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: How to create an NSDecimal?
On Mar 14, 2009, at 2:35 PM, Ashley Clark wrote: I don't see NSDecimalFromString() in any of the docs or header files, only NSDecimalString() to create strings. Where is that defined? It's part of Foundation, defined in NSDecimal.h. On Mar 14, 2009, at 2:08 PM, Luca Pazzerello wrote: You can also create NSDecimals using NSDecimalFromString(). --Luca C. 2009/3/14 Ashley Clark acl...@ghoti.org You can get an NSDecimal structure from any NSNumber or NSDecimalNumber object by sending it the -decimalValue message. As far as I know that's the only way to create one. Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Binding to selection of NSArrayController manually
On Mar 13, 2009, at 9:42 AM, Ivy Feraco wrote: Hello everybody Bindings problem: I have an NSArrayController subclass and an NSPopUpButton subclass. I am trying to bind the NSPopUpButton's selected object to the selection of my array controller. I have to do this manually for reasons I won't get into here. But when I do this (self is myPopUpButton) [self bind:@selectedObject toObject:ArrayController withKeyPath:@selection options:nil]; I get the error that my array controller is not KVC for the key path selection. selection is definitely a controller key option in Interface Builder, is it possible that this doesn't work programmatically? Has anyone else run into this problem??? I want to bind to the selected object, not the index... so it seems my only option here is selectedObjects, which I will have to pass an array of one object to. Even if you didn't get the error, this approach wouldn't work. The selectedObject must be an exact object from the content collection. - selection returns a proxy object. You might try barking up using selectedValue instead. But then, you might still have the binding error, or it might go away since you are binding through selection. Anyway, have you verified that the ArrayController variable is what you expect it to be at the point that bind: is called? HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSObjectController selection - now you see it, now you don't
On Mar 7, 2009, at 11:05 PM, Luke Evans wrote:
Well, what actually happens is that -selectedObjects almost always
returns an empty array. Sending -setContent: does not appear to
result in this content being available as the selectedObject in the
way described (or there's other magic to get this to happen?).
snip
- (void)awakeFromNib {
[objController setContent:@This is a nice string];
NSArray *selectedObjects = [objController selectedObjects];
id selectedObject = (selectedObjects [selectedObjects count])?
[selectedObjects objectAtIndex:0] : nil;
NSLog(@The selectedObjects were: %@,\n the selectedObject was:
%@, selectedObjects, selectedObject);
[objController setContent:@Another string];
selectedObjects = [objController selectedObjects];
selectedObject = (selectedObjects [selectedObjects count])?
[selectedObjects objectAtIndex:0] : nil;
NSLog(@The selectedObjects were: %@,\n the selectedObject was:
%@, selectedObjects, selectedObject);
}
What happens when this is run is that the first time -setContent: is
used, the -selectedObjects method returns the object (the string).
The second time however, has -selectedObjects return NO object (i.e.
the empty array).
IIRC, NSObjectController, as a super class has some behavior that
doesn't make sense to an NSObjectControlelr proper. Because of this it
is possible that the selection change has been deferred to the run
loop. You can manually run the run loop to see if this is the case.
It seems to me that there is no need for you to use -selectedObjects
when there will always be a 1:1 relationship between the controller
content and the selected object.
HTH,
Keary Suska
Esoteritech, Inc.
Demystifying technology for your home or business
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Re: NSObjectController selection - now you see it, now you don't
On Mar 8, 2009, at 2:20 PM, Luke Evans wrote: IIRC, NSObjectController, as a super class has some behavior that doesn't make sense to an NSObjectControlelr proper. Because of this it is possible that the selection change has been deferred to the run loop. You can manually run the run loop to see if this is the case. It seems to me that there is no need for you to use - selectedObjects when there will always be a 1:1 relationship between the controller content and the selected object. Yes, naturally if I change my selection code to just look at the content then indeed everything works fine. However, see below... I'm not sure about the run loop thing. Although I haven't tried this in my test app yet, the behaviour in the main app seems to suggest that changing the content object never updates the selectedObjects array, except perhaps for the very first time. After setting the content, but before you check selectedObjects, run: [[NSRunLoop currentRunLoop] runUntilDate:[NSDate date]]; If that works, then you have the runloop issue. Otherwise, it is probably a bug and I would file a radar. Just know that there may be caveats to forcing the runloop like this, so caveat programmor. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Can an object observe itself?
On Mar 7, 2009, at 1:31 PM, Stuart Malin wrote: I have a model class with multiple properties. I need to know in a variety of places when certain of these change. Presently, the model objects can be changed by an inspector that has bindings to the model instances, which are managed as a collection by an NSArrayController. So... I tried adding code to the model object to observe itself (on a key that is a dependent key set up with +setKeys:triggerChangeNitificationsForDependentKeys). I was then going to have that observer issue a notification. However, the model's -observeValueForKeyPath:ofObject:change:context: method isn't getting called when I make changes. Thinking the problem was with the dependent key, I changed to observe a specific key. That doesn't work either. So I am wondering if an object can observe itself. I add the observer in the model object's -init method, after invoking -init on the superclass: The main issue is that you have to remove observation before deallocating. Otherwise an exception will be raised (Leopard) or you will crash (Tiger and earlier). HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSString leak or RedHerring again?
On Mar 5, 2009, at 12:26 PM, James Cicenia wrote:
OK That worked but now that I got you:
Why is it complaining about the indicated array below:
while (sqlite3_step(statement) == SQLITE_ROW) {
//find subtype as key in the dict first
if(![aDict objectForKey: [NSString stringWithUTF8String:(char
*)sqlite3_column_text(statement, 2)]]){
NSMutableArray *tmparray = [[NSMutableArray alloc]init];
== = Says it leaks?
[aDict setValue:tmparray forKey: [NSString stringWithUTF8String:
(char *)sqlite3_column_text(statement, 2)]];
[tmparray release];
}
May be a false positive, unless there is other code that may cause it
to leak. But, the following:
subtypeArray = [aDict objectForKey: [NSString stringWithUTF8String:
(char *)sqlite3_column_text(statement, 2)]];
[subtypeArray addObject: [NSString stringWithUTF8String:(char
*)sqlite3_column_text(statement, 0)]];
[aDict setValue:subtypeArray forKey: [NSString stringWithUTF8String:
(char *)sqlite3_column_text(statement, 2)]];
}
If subtypeArray is mutable, as it appears to be, the last statement is
useless and potentially dangerous.
Best,
Keary Suska
Esoteritech, Inc.
Demystifying technology for your home or business
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Bindings: Why Doesn't Key Value validation Update The UI?
I can't imagine why I haven't come across this before but it appears that when a key-value validation method alters the passed object and returns YES, the view is not updated with the coerced value. I need behavior, for instance, where an NSTextField is supposed to display a numerical value that if the field is cleared that it is re- set to 0. Sounds simple, but I can't get it to work. Calling a KVC setter in validateKey (which could be bad) doesn't cause the update. Neither doing the same in the setter (also sounds like a bad idea anyway). It seems like I have two options: set a transformer (that is really acting like a validator) or trick bindings with a change-value-for-key notice triggered using performSelector:afterDelay:. Anyone have any better ideas? TIA, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSTableView Popup Column issue
On Feb 6, 2009, at 8:47 AM, Jon C. Munson II wrote: The issue is that the popup displays a left paren, and when the list is displayed, shows the item as an array dump (instead of the proper attribute's value). I also cannot select that value and have it stick to the underlying datasource (which is an intermediary table in a SQLite store, provided by Core Data). This generally means that you are binding a single value representation to an array (multiple). I know the popup is getting the proper values from its supporting NSArraryController as I removed the binding for the Selected Object and the popup works as expected (minus the saving of the selected object) - the attribute's value is displayed correctly in the list. The problem occurs when I set the selected object binding. The Selected Object binding is configured thus: Bind to: tblPattern_Yarn Controller Key: arrangedObjects Model Key path: relYarn And here you do it. Selected Object needs to be bound to something that returns a single value. arrangedObjects returns an array. Perhaps you want selection? HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: becomeFirstResponder override issue
On Feb 2, 2009, at 8:44 AM, Chris Anderson wrote:
Thanks. And yes the controller has content. In my example below it
returns 0 when inside becomeFirstResponder and returns 0 when I
activate detectPicker in the same application instance.
I was more interested in whether myArrayController is nil when -
becomeFirstResponder is called. The NSLog below won't tell you that,
so I wasn't sure if you specifically checked for nil.
On 2-Feb-09, at 7:40 AM, Keary Suska wrote:
On Feb 1, 2009, at 10:32 PM, Chris Anderson wrote:
I've created a subclass of NSDatePicker to catch when a date
picker has focus. I have overridden the becomeFirstResponder
method and indeed it detects when it has focus. The code inside
the method does work except for any IBOutlets that I may have
connected. They don't respond to any requests.
I have verified that the IBOutlets are connected by adding a
separate IBAction in the subclass and a simple button to invoke
the action. Inside the IBAction I can call the same IBOutlets
successfully.
I am baffled as to why when the IBOutlets are inside
becomeFirstResponder they don't seem connected. Example below...
-(BOOL)becomeFirstResponder // myArrayController will not respond
{ NSLog(@DetectDatePicker:firstResponder: %i,
[[myArrayController arrangedObjects] count]);
return YES;
}
-(IBAction)detectPicker:(id)sender // myArrayController
successfully responds
{ NSLog(@DetectDatePicker:performClick: %i,[[myArrayController
arrangedObjects] count]);
}
Have you checked whether myArrayController is nil, just whether it
has content? Those would likely be two separate issues...
Keary Suska
Esoteritech, Inc.
Demystifying technology for your home or business
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Re: Disabling sorting in a programatically generated table
On Jan 30, 2009, at 10:39 AM, Ken Tozier wrote: On Jan 30, 2009, at 10:52 AM, Keary Suska wrote: When you call -bind: do you pass NSCreatesSortDescriptorBindingOption NO? I'm not calling bind, because the array controller and array are created inside the same function, so it just seemed bass ackward to write an accessor for something I can just set directly with [controller setContent: tableData]. I looked at the NSArrayController docs again and didn't see any method that approximates NSCreatesSortDescriptorBindingOption other than [controller setSortDescriptors: nil]; [controller setAutomaticallyRearrangesObjects: NO]; You don't have a binding between the table view and the array controller? Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Disabling sorting in a programatically generated table
On Jan 30, 2009, at 1:59 AM, Ken Tozier wrote: Hi I need to completely disable sorting in a programatically generated table, but have found that no matter what I try, clicking on the column header sorts the table. I've set the following sort descriptors to nil // On the table [table setSortDescriptors: nil]; // On the column [column setSortDescriptorPrototype: nil]; // And on the array controller for each column [controller setSortDescriptors: nil]; [controller setAutomaticallyRearrangesObjects: NO]; How do you shut down all sorting on a table? When you call -bind: do you pass NSCreatesSortDescriptorBindingOption NO? HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: NSFileHandle or a better way?
On Jan 30, 2009, at 7:44 AM, Jaime Magiera wrote: I've been using NSFIleHandle for a project that inserts data into a file and synchs it back to disk. Everything went smoothly until the app started getting used for larger files ( 200 megs). First, I ran into the NSFileHandle - NSData 256 megs conundrum. That was solved by, as others suggested on this list in other threads, iterating with readDataOfLength or availableData instead of a single readDataToEndOfFile. That worked well. I've got pools set up to keep the memory down. The problem now is that the reads are still really slow. For example, with a read length of 50 megs, I can only get in 3 reads per second. My apps ends up taking almost a minute to perform all of its functions on a file of 500 megs. Perhaps my overall approach was wrong to start out. What I've been doing is opening a file handle, copying the data after the insertion point to an NSData, truncating the file handle at the insertion point, adding the new data, then adding back the trimmed data. This works fairly well if the insert point is towards the end of the file. However, there are instances where I need to insert a few hundred kb into a the file at a location only a few hundred kb into the file. xxx ^ x The time hit comes from copying the trim data to the NSData. Is there a better way to do this with NSFileHandle? Is there a better way to do this than NSFileHandle? I suspect your bottleneck is the filesystem. To know for sure you could try the raw C calls and see if it speeds up. In any case, instead of doing a grow/shrink on the file, write to a temp file instead then swap them. This way you could also do optimized batch- writes. This alone could speed the process up immensely. Notwithstanding, how do you recover if your app crashes after you truncate the file? HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: sqlite iphone question....
On Jan 23, 2009, at 10:30 AM, James Cicenia wrote:
- (void)initializeDatabase {
NSMutableArray *items = [[NSMutableArray alloc] init];
self.produceItems = items;
[items release];
// The database is stored in the application bundle.
NSArray *paths =
NSSearchPathForDirectoriesInDomains(NSDocumentDirectory,
NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *path = [documentsDirectory
stringByAppendingPathComponent:@whatsfresh.sqlite];
// Open the database. The database was prepared outside the
application.
if (sqlite3_open([path UTF8String], database) == SQLITE_OK) {
NSLog(@Open Database);
// Get the primary key for all produce.
const char *sql = SELECT id FROM Item;
sqlite3_stmt *statement;
// Preparing a statement compiles the SQL query into a byte-
code program in the SQLite library.
// The third parameter is either the length of the SQL string
or -1 to read up to the first null terminator.
if (sqlite3_prepare_v2(database, sql, -1, statement, NULL)
== SQLITE_OK) {
NEVER GETS PAST THIS IF. I have queried the database and the data is
in there?!
Working with files in the app bundle like this may be a non-no. At
least, it is for Mac OS X, and the emulator might have this issue. To
know for sure, put the database file into the sandbox and see if it
behaves better there.
HTH,
Keary Suska
Esoteritech, Inc.
Demystifying technology for your home or business
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Re: Encryption: Simplest method to encrypt a SQLite DB file...? {iPhone}
On Jan 23, 2009, at 9:41 AM, fc...@dialup4less.com wrote: Environment: iPhone I'm particularly concerned with 'data viewing'. Think of the data as answers to a quiz. I worry that some hacker could copy distribute the data (rules) on the internet, and in essence, cheat the game. Being that ... iPhone is far more restrictive towards tampering..., Is it still possible to grab the SQLite DB file from the bundle to view its (uncoded) data? If not, then there's no need to encrypt the SQLite DB file within the App Bundle. Also consider the iPhone backup with iTunes onto the Mac. Not sure how difficult those archives are to crack, or whether any attempt has even been made to prevent it. Best, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
Re: Search Fields, Array Controllers and Multiple NIBs
On Jan 19, 2009, at 9:58 PM, Brad Gibbs wrote: I have a Core Data app with a container view controller and multiple subviews, each with a view controller and a separate NIB. Subview switching is done via a segmented control. The subviews each display the same data, but in different ways -- one is a table view, another is an image view and the third is a cover flow view. The container view displays the segmented control that does the switching and a search field that is used to filter what is shown in the subviews. My aim is to have the search field filter the three views equally, such that if the user performs a search, all three subviews will show the filtered results of that search. So, the user the perform the search and each of the three views will display the filtered results of the same search. I've tried a number of approaches. To me, it seems the most logical approach is to have the container view pass its MOC and NSArrayController instance to each of the subviews as it creates them. I still need to create an NSArrayController instance in each view's NIB file in IB to bind the objects in each of the views, but I can create an outlet in each view controller and set it to the NSArrayController instance passed in from the main view when the subview is instantiated. But, this doesn't seem to work. I can NSLog each array controller to see that each view has the same instance of the NSArrayController, but searching in the main view doesn't seem to filter any of the subviews properly. If I understand this correctly, you have an NSArrayController instantiated in the nib, and one created programmatically. If they aren't connected in some way, there is no way for the filtered NSArrayController to communicate its changed contents to the nib-based controller, so the display never changes. One better solution, I think, is to not use bindings at all for the search field. Instead, connect it to the main controller (target/ action is probably best), who on execution sets a filter predicate that is a property bound from the NSArrayController in the nib. Or, if you already have outlets to the NSArrayController, you can just call - setFilterPredicate:. HTH, Keary Suska Esoteritech, Inc. Demystifying technology for your home or business ___ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
