Re: NSDrawer

[Phil Marell]

Hi,

One potential problem I see with drawers is - if the window was in full screen 
mode, nothing appears to happen unless they know to get out of full screen 
(which isn’t a good experience).

Instead, I would say that Mac apps nowadays tend to have the ability to toggle 
showing a sidebar-like inspector within the existing window, rather than a 
drawer extending out of the window. Because the contents of the existing window 
is modified, this solves the full screen problem. Apps like Xcode, and in the 
current iWork suite do this.

When doing this though, there is one case I can think of that you would need to 
handle - if the window is at its minimum size, the window would have no choice 
but to expand itself. I think this is something NSSplitViewController can help 
with though.

Hope that helps,
- Phil

> On 15 Jul 2018, at 05:00, cocoa-dev-requ...@lists.apple.com wrote:
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> Today's Topics:
> 
>   1. Re: NSDrawer (Uli Kusterer)
>   2. Re: NSDrawer (Casey McDermott)
> 
> 
>> On 3. Jul 2018, at 04:08, Casey McDermott  =
> wrote:
>> =20
>> NSDrawer is deprecated, but it's also perfect for our application.
>> We still haven't found a good substitute.
>> =20
>> Our app has an outline view that loads various types of business =
> records
>> into a tab view.  Some of them have optional extra info.  When it's =
> small a panel is fine,
>> but some records have large tables: about the same size as the main =
> record. =20
>> A drawer is perfect for viewing them side-by-side with the main info. =20=
> 
>> In a panel it obscure the main record, and users need to see both.
>> =20
>> Is there a work-around for an attached window that pops out on the =
> side,
>> and acts like a drawer? =20
>> =20
>> Any idea when deprecation turns into total non-support?
>> =20
>> Thanks,
>> =20
>> Casey McDermott
>> www.TurtleSoft.com
>> ___
>> =20
>> Cocoa-dev mailing list (Cocoa-dev@lists.apple.com)
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> https://lists.apple.com/mailman/options/cocoa-dev/witness.of.teachtext%40g=
> mx.net
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>> This email sent to witness.of.teacht...@gmx.net
> 
> Cheers,
> -- Uli Kusterer
> "The Witnesses of TeachText are everywhere..."
> http://www.zathras.de
> 
> 
> 
> 
> 
> 
> NSPanel is still modal, but longer lasting.  We use it a lot, and it
> looks better than the modal dialogs in the current app.
> 
> NSDrawer is a non-modal extension to the main window, designed to stick
> around for a while.
> 
> In our case, we have business data entry forms, and then sometimes people
> add an optional table of details.  Sometimes they'll spend hours on the table 
> (e.g. for 
> a construction estimate with hundreds of line items).  
> 
> They still need to see/edit the main form at the same time, so NSPanel won't 
> work,
> and NSDrawer is just right.  If it's ever removed entirely, we'll pretty much 
> have
> to duplicate it in code.
> 
> The current app switches between multiple layouts with and without the table, 
> but the new look is cleaner, and better suited for a single window with 
> outline & tabs.
> 
> Thanks,
> 
> Casey McDermott
> http://www.turtlesoft.com 
> 
> 
> On Fri, 7/13/18, Uli Kusterer  wrote:
> 
> Subject: Re: NSDrawer
> To: "Casey McDermott" 
> Cc: cocoa-dev@lists.apple.com
> Date: Friday, July 13, 2018, 9:13 PM
> 
> Just for completeness' sake:
> You're aware of NSPopover?
> 
> 
> 
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Re: Very basic need, very difficult to achieve.

[Phil Stokes]

> On 4 May 2016, at 09:18, Graham Cox  wrote:
> 
> I could not download 10.9 as the button was greyed out with “downloaded” on 
> it.


Yeah, about that. 

Whenever you download from the App Store, save a copy of the installer BEFORE 
you run it. 

Copy it off onto some removable media device. If you ever want to re-download 
the same installer, make sure that removable device is disconnected. App Store 
searches for the installer (starting in /Applications but going through every 
mounted device) to see if the installer is already present. If it is, you get 
the greyed-out button.


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Customising the IKImageBrowserView bezel mode disclosure button

[Phil Barrett]

So I'm using an IKImageBrowserView with IKGroupBezelStyle, and it's working
well.

My problem is that I want to move and/or customise the appearance of the
small rectangular black button which opens and closes the group. It's drawn
over the top of the first image - I want to move it so it doesn't obscure
the image.

Notably, IKImageBrowserGroupTitleKey, despite being documented as This
string is used for the disclosure style only is used as the label on this
button.

All advice welcome.

Thanks

Phil
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Core Audio Help

[Phil Hystad]

I have been reading the Core Audio documentation at the Apple Developer site 
and I am not sure I know any more today then when I started.  Are there any 
Core Audio programmers on this list or is there a better spot.

Basically, I am planning to experiment with various DSP filters on an input 
audio signal.  So, take in the audio analog signal which then goes through ADC 
via the hardware then I want the stream of numbers.  Of course, there are a lot 
of details on the way.

What I need is help in pointing me in the right direction.  That is, what are 
the important parts of Core Audio where I need to focus my attention.

Thanks,
phil

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Re: Core Audio Help

[Phil Hystad]

Yes, I know of that promised book.  It seems to have been in the works for a 
long time.  I just checked Amazon and it says April 2012.  Well, I think I have 
seen such a release date before but it was probably a year or two ago.

On Dec 23, 2011, at 9:25 AM, Ravi Singh wrote:

 I have been eagerly waiting for Chris Adamson(sp) book or Core Audio, and my 
 Amazon order I think is around 2 years old now. I would look for his site and 
 talks at iDev360 and VTM because he is the best resource I found for 
 interesting stuff.
 On Dec 23, 2011, at 11:14 AM, Phil Hystad wrote:
 
 I have been reading the Core Audio documentation at the Apple Developer site 
 and I am not sure I know any more today then when I started.  Are there any 
 Core Audio programmers on this list or is there a better spot.
 
 Basically, I am planning to experiment with various DSP filters on an input 
 audio signal.  So, take in the audio analog signal which then goes through 
 ADC via the hardware then I want the stream of numbers.  Of course, there 
 are a lot of details on the way.
 
 What I need is help in pointing me in the right direction.  That is, what 
 are the important parts of Core Audio where I need to focus my attention.
 
 Thanks,
 phil
 
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Re: Core Audio Help

[Phil Hystad]

You know -- I looked for Core Audio before in the Apple lists but did not see 
it.  I only saw that other list that begins with c.  But, I did find it this 
time -- more careful reading on my part -- and joined up and posted my message.


On Dec 23, 2011, at 9:39 AM, Steve Bird wrote:

 
 On Dec 23, 2011, at 12:14 PM, Phil Hystad wrote:
 
 I have been reading the Core Audio documentation at the Apple Developer site 
 and I am not sure I know any more today then when I started.  Are there any 
 Core Audio programmers on this list or is there a better spot.
 
 I know there is a Core Audio list.
 
 I was going to suggest searching at Lists.apple.com.
 
 But that web page is hosed.  It tells me:
 An error occured!
 Inverted word index not found. Probably you forgot to run 'indexer -Eblob'.
 
 I didn't know I was supposed to run an indexer on the Eblob.
 
 Click on the LISTS link and you get page not found
 
 ANYWAY, there is a CoreAudio list, but if we tell you where to subscribe, 
 we'll have to kill you.
 
 
 
 Steve Bird
 Culverson Software - Elegant software that is a pleasure to use.
 www.Culverson.com (toll free) 1-877-676-8175
 
 

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Re: Core Audio Help

[Phil Hystad]

Thanks.

On Dec 23, 2011, at 10:02 AM, Antonio Nunes wrote:

 On 23 Dec 2011, at 18:44, Phil Hystad wrote:
 
 Yes, I know of that promised book.  It seems to have been in the works for 
 a long time.  I just checked Amazon and it says April 2012.  Well, I think I 
 have seen such a release date before but it was probably a year or two ago.
 
 Go to Safari books online. You should be able to get access to the book now 
 through the Rough Cuts option.
 
 http://my.safaribooksonline.com/9780321636973
 
 -António
 
 
 Energy is like a muscle,
 it grows stronger through being used.
 
 
 

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Re: Core Audio Help

[Phil Hystad]

So, what web U/I are you talking about that has been down for a month?

I was able to go to lists.apple.com earlier today and join the core audio api 
list.  Got my confirmation e-mail and everything.  Plus, even received a couple 
of messages posted to core audio from others.

phil

On Dec 23, 2011, at 8:14 PM, Jens Alfke wrote:

 
 On Dec 23, 2011, at 9:14 AM, Phil Hystad wrote:
 
 I have been reading the Core Audio documentation at the Apple Developer site 
 and I am not sure I know any more today then when I started.  Are there any 
 Core Audio programmers on this list or is there a better spot.
 
 coreaudio...@lists.apple.com … but I think you need the web UI to subscribe 
 to it, and apparently that’s still down (for like, a month now? What’s up 
 with that?)
 
 Anyway, I feel your pain. CoreAudio is possibly the gnarliest Mac API in 
 existence*. It’s a toss-up between it and the Security APIs — CoreAudio makes 
 you deal with threading, but Security has even worse docs and less sample 
 code. :-P
 
 Have you looked at AVFoundation? I believe it’s available on 10.7 now. It 
 appears to be the high-level OOP audio API I would have turned tricks for in 
 2007.
 
 —Jens
 
 * Among deceased APIs, of course, QuickTime is the worst. OMG THE HORROR

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iPad store ?

[Phil Hystad]

This may be off-topic but I am not sure of the right forum.

Is there any way to deploy an iPad app other then the AppStore?  I don't mean 
for development testing or other temporary purposes.

Situation is the development of an application for a particular customer who 
would use the app for specific in-house purposes.  The app would not be 
generally available, at least that is the intent.

Thanks for any comments or directions to a more suitable list.

Phil

Sent from my iPad
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Re: iPad store ?

[Phil Hystad]

Thanks.  I will look at that.

PEH's iPhone

On Sep 12, 2011, at 10:17 AM, Hunter Hillegas li...@lastonepicked.com wrote:

 There's an Enterprise program meant for internal deployments.
 
 http://developer.apple.com/programs/ios/enterprise/
 
 On Sep 12, 2011, at 10:04 AM, Phil Hystad wrote:
 
 Is there any way to deploy an iPad app other then the AppStore?  I don't 
 mean for development testing or other temporary purposes.
 
 Situation is the development of an application for a particular customer who 
 would use the app for specific in-house purposes.  The app would not be 
 generally available, at least that is the intent.
 
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Initial project shell and handling of window pointer

[Phil Hystad]

I am not sure if this is a question for Cocoa-dev or for Xcode.

I just started playing around with iOS 4 and Xcode 4.  Learning the ropes of 
the new Xcode I see a difference in how the project templates are used to 
create a simple Cocoa window app in iOS versus Mac OS X.

With iOS, the app delegate handler code .h file does not declare the window 
pointer variable which I see is prefixed with an underscore as in _window.

With Mac OS X, the app delegate handler .ht file does indeed create an instance 
variable for window and it does not have the prepended underscore.

Can someone describe why this was done (differently) if there is a purpose to 
this?  Where is the _window instance variable created?

Thanks,
phil___

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Re: sending a message from an initializer method

[Phil Hystad]

You can do the following, in your implementation file create a local procedure 
and then call it from your init
method.  I did not bother copying your arguments but you define them in the 
regular way.

-(void)myCalculation
{
 // do the calculation
}

- (id) init
{
if ( self = [super init] ) {
  // do your init
  var3 = [self myCalculation];
}
return self;
}


On Jan 12, 2011, at 3:41 AM, Luc Van Bogaert wrote:

 Hi,
 
 I have a question about how to design a initializer mehod. 
 
 I have defined a class with three instance variables. Two of them are arrays 
 and their value can be initialized straightforward in the initializer method, 
 but the value of the third instance variable is the result of a complex 
 algorithm, based on the contents of the two arrays.
 
 I would like to implement that algorithm in a seperate method, instead of 
 writing it directly in the initializer. Is that OK, and could I then message 
 self in the initializer like: 
 
 - (id) init
 {
   self = [super init];
   if (self) {
   var1 = ...;
   var2 = ...;
   var3 = [self computerVar3With:var1:var2];
   }
   return self;
 }
 
 Or is it better to write the algorithm directly as part of the initializer?
 Thanks,
 
 -- 
 Luc Van Bogaert
 luc.van.boga...@me.com
 
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Initializing a view controller...

[Phil Hystad]

Is there a proper way to initialize a view controller.  So far, I have been 
doing this in the application delegate by calling calling an initialize method 
( i.e. [viewController initialize]) in 
application:didFinishLaunchingWithOptions: method (prior to the view being 
added to the window and the window made visible).

However, I am not sure if this is the Cocoa canonical way of doing things.  By 
the way, this example comes from UIKit but the same question would apply to any 
OS X Cocoa application too.

phil
phys...@mac.com

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Re: Initializing a view controller...

[Phil Hystad]

Andreas:

Thanks for the information.  Now, I should kick myself for picking the name 
initialize but then maybe I should complain about Apple picking all the best 
names for methods.

I think I have used the -viewDidLoad method before.

phil


On Jan 10, 2011, at 9:58 AM, Andreas Grosam wrote:

 
 On Jan 10, 2011, at 4:17 PM, Phil Hystad wrote:
 
 Is there a proper way to initialize a view controller.  So far, I have been 
 doing this in the application delegate by calling calling an initialize 
 method ( i.e. [viewController initialize]) in 
 application:didFinishLaunchingWithOptions: method (prior to the view being 
 added to the window and the window made visible).
 
 
 *** Important ***
 +(void)initialize is a class method which the runtime sends to the class 
 exactly once just before any of this class' method is invoked, and any of its 
 super class if +initialized has not yet been invoked.
 You rarely need to override +initialize -- and you never call it yourself!
 
 
 
 But yes, there is a proper way to do initialization of a view controller 
 object :)  There are lots of examples of how you should do this within the 
 iOS or Mac OS X documentation.
 
 Basically, when you load your view from a nib you will override these methods 
 in order to initialize a view controller:
 
 -viewDidLoad
   This method is called regardless of whether the views were stored in a 
 nib file or created 
   programmatically. You usually override it to do additional setup after 
 the view has been 
   loaded from a nib.
   If you override -viewDidLoad you may want to override -viewDidUnload 
 accordingly, which is the  counterpart of -viewDidLoad.
 
 
 -awakeFormNib 
   To do additional setup after the view has been loaded from a nib. You 
 often can do all your setup
   in viewDidLoad, but sometimes this seems a better place. At the time 
 the method is invoked,
   outlet and action connections are already established.
 
 
 In the cases where you want to create the controller's view yourself 
 programmatically, you have to use
 -loadView. If you do so, you need to create the view hierarchy and assign the 
 root view to the view property of the controller.
 
 
 You must not call any of these methods yourself! The framework will do this 
 for you when it is appropriate.
 
 
 An example might be useful:
 
 The following code assumes you have a nib where you load the view:
 
 @interface MyViewController : UIViewController {
  IBOutlet UIView* mySpecialSubView;
  NSArray* myArray;
 }
 
 @property (retain) UIView* mySpecialSubView;
 @property (retain) NSArray* myArray;
 
 @end
 
 @implementation
 @synthesize mySpecialSubView;
 @synthesize myArray;
 
 - (void) viewDidLoad
 {
[super viewDidLoad];  // always invoke super!
 
// In debug mode, you might check here whether you have established the 
 links for your outlets in IB:
NSAssert(mySpecialSubView, @IBOutlet 'mySpecialSubView' is nil); // 
 forgot to setup the link in IB?
 
// configure my view unless this is already done in IB:
self.view.backgroundColor = [UIColor blackColor];
 
// do other setup, for instance setting up a navigation bar, navigation 
 item
...
 
// if your view controller needs to initialize other ivars, you might 
 initialize them here, 
// or do lazy initialization (see below)
...
 
// Note, that viewDidLoad will be called *everytime* the view gets 
 reloaded from
// the resource!
// Sometimes, you explicitly DON'T want to perform certain initialization 
 steps again 
// after the view will be reloaded. In this case, use a flag as an ivar 
 which determines 
// whether you have done these initialization steps:
if (!isInitialized) {
   [self setupOnce];
isInitialized = YES;  // this is an ivar
} 
 }
 
 
 You have to override -viewDidUnload in certain cases, e.g.:
 
 - (void) viewDidUnload {
self.mySpecialSubView = nil;// Outlets shall be set to nil!
 
// optionally, you might want to release myArray - just in order to safe 
 memory. But
// this depends on your needs, and often you explicitly don't want the 
 array to be
// recreated after a reload of the view. 
self.myArray = nil; // optionally
 }
 
 
 
 // lazy initialization - this overrides the getter method which was otherwise 
 defined
 // by the @synthesize directive:
 - (NSArray*) myArray {
if (myArray == nil) {
myArray = [NSArray alloc] init... ];
}
return myArray;
 }
 
 
 // don't forget to release ivars if required:
 -(void) dealloc {
[mySpecialSubView release], mySpecialSubView = nil;
[myArray release], myArray = nil;
[super dealloc];  // always invoke super (at the last statement)
 }
 
 
 
 One thing you should care of:
 -viewDidLoad and -awakeFormNib, as well as -loadView may be called more than 
 once for the lifetime of the view controller. So, be carefully not to 
 initialize ivars in such a way that you get a memory

Re: Initializing a view controller...

[Phil Hystad]

Fritz...

Thanks for the pointers to the documentation.  I was going to get to reading it 
if I struck out here.  I am really not lazy, just old.

phil

On Jan 10, 2011, at 8:42 AM, Fritz Anderson wrote:

 On 10 Jan 2011, at 9:17 AM, Phil Hystad wrote:
 
 Is there a proper way to initialize a view controller.  So far, I have been 
 doing this in the application delegate by calling calling an initialize 
 method ( i.e. [viewController initialize]) in 
 application:didFinishLaunchingWithOptions: method (prior to the view being 
 added to the window and the window made visible).
 
 I first wrote a brief essay on what to do, where, depending on whether you 
 instantiate programmatically or in a NIB. But why not refer you to a better 
 explanation than I can piece together in five minutes?
 
 View Controller Programming Guide for iOS.
 http://developer.apple.com/library/ios/#featuredarticles/ViewControllerPGforiPhoneOS/Introduction/Introduction.html
 
 Particularly: Understanding the View Management Cycle
 http://developer.apple.com/library/ios/#featuredarticles/ViewControllerPGforiPhoneOS/BasicViewControllers/BasicViewControllers.html%23//apple_ref/doc/uid/TP40007457-CH101-SW19
 
   — F
 

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Missing Cocoa/Cocoa.h ??

[Phil Hystad]

I just started playing around with Xcode and Cocoa again and doing a few little 
iPad apps.  When I add a class to the project, (simple NSObject based class) 
the .h file includes the import for Cocoa/Cocoa.h.  But, the build and 
compile fails because it says this header file is not found.

This happens even if I do absolutely nothing to the class files other then use 
the regular File create class option.  This can be repeated easily by merely 
creating an iPad view application shell.  If you do an immediate build it 
works.  If you were to create a new class as I described (and not modify the 
generated .h,.m files) the build fails with the Cocoa.h file not being found.

Obviously something is askew in what I am doing.

phil
phys...@mac.com

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Re: Missing Cocoa/Cocoa.h ??

[Phil Hystad]

I just did it again.  I create a new project, iOS View Application for iPad.  
Do an immediate build and it works and runs fine (with blank view of course).  
The, I add a class, which I called MyModel just for the heck of it.  It is 
based on NSObject and it imports Cocoa.h as generated by the template.  Now, 
when I build, it gets an error because Cocoa.h is not found.

There must be some problem with my template.  I am up to date on Xcode and the 
SDKs and I think I refreshed the iOS SDKs just the other day.  So, either I 
have something screwed up in my templates (which I have never mucked with) or 
there is a bug in the template as it came from Apple.

phil
phys...@mac.com


On Jan 3, 2011, at 8:11 PM, Roland King wrote:

 ipad? That's iOS and those templated files should include 
 Foundation/Foundation.h not Cocoa/Cocoa.h, did you pick the wrong file 
 type from the template. 
 
 On 04-Jan-2011, at 1:47 AM, Phil Hystad wrote:
 
 I just started playing around with Xcode and Cocoa again and doing a few 
 little iPad apps.  When I add a class to the project, (simple NSObject based 
 class) the .h file includes the import for Cocoa/Cocoa.h.  But, the build 
 and compile fails because it says this header file is not found.
 
 This happens even if I do absolutely nothing to the class files other then 
 use the regular File create class option.  This can be repeated easily by 
 merely creating an iPad view application shell.  If you do an immediate 
 build it works.  If you were to create a new class as I described (and not 
 modify the generated .h,.m files) the build fails with the Cocoa.h file not 
 being found.
 
 Obviously something is askew in what I am doing.
 
 phil
 phys...@mac.com
 
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Re: Missing Cocoa/Cocoa.h ??

[Phil Hystad]

Roland,

Yes, I just discovered that I was creating the object template from the Mac OS 
X section even though I created the project from iOS.  Now, I have no idea how 
that template section got referenced but it seems to be that the template 
selection should be automatically switched to iOS if you create the project 
from iOS.  I will have to watch that in the future.

phil

On Jan 3, 2011, at 8:23 PM, Roland King wrote:

 Which template are you using to add the object ... 
 
 There's two sets, the ones at the top of the list are for iOS, the ones at 
 the bottom are for OS X, you want to add an object from the top set. 
 
 On 04-Jan-2011, at 12:20 PM, Phil Hystad wrote:
 
 I just did it again.  I create a new project, iOS View Application for iPad. 
  Do an immediate build and it works and runs fine (with blank view of 
 course).  The, I add a class, which I called MyModel just for the heck of 
 it.  It is based on NSObject and it imports Cocoa.h as generated by the 
 template.  Now, when I build, it gets an error because Cocoa.h is not found.
 
 There must be some problem with my template.  I am up to date on Xcode and 
 the SDKs and I think I refreshed the iOS SDKs just the other day.  So, 
 either I have something screwed up in my templates (which I have never 
 mucked with) or there is a bug in the template as it came from Apple.
 
 phil
 phys...@mac.com
 
 
 On Jan 3, 2011, at 8:11 PM, Roland King wrote:
 
 ipad? That's iOS and those templated files should include 
 Foundation/Foundation.h not Cocoa/Cocoa.h, did you pick the wrong file 
 type from the template. 
 
 On 04-Jan-2011, at 1:47 AM, Phil Hystad wrote:
 
 I just started playing around with Xcode and Cocoa again and doing a few 
 little iPad apps.  When I add a class to the project, (simple NSObject 
 based class) the .h file includes the import for Cocoa/Cocoa.h.  But, 
 the build and compile fails because it says this header file is not found.
 
 This happens even if I do absolutely nothing to the class files other then 
 use the regular File create class option.  This can be repeated easily by 
 merely creating an iPad view application shell.  If you do an immediate 
 build it works.  If you were to create a new class as I described (and not 
 modify the generated .h,.m files) the build fails with the Cocoa.h file 
 not being found.
 
 Obviously something is askew in what I am doing.
 
 phil
 phys...@mac.com
 
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Threading and Event Queue Question

[Phil Hystad]

I am not an experienced programmer in Cocoa -- I have only dabbled.  But, I 
have a question with regard to how event queue (terminology may not be correct) 
is done differently then a windows platform.

As an example, I noticed that each separate Tab of a Chrome browser instance is 
itself a separate process.  Yet, each separate tab of Safari seems to be folded 
into the single Safari process.  I have also noted that tabs in Safari are 
totally independent of each other such that I can be playing music from Pandora 
on one tab and watching a Netflix movie in another tab of the same Safari 
instance.

From my knowledge of the MS Windows platform (WPF for example), this cannot be 
done.  That is, a process has a single event queue from which events are 
dispatched (control events like mouse, timer, and so on).  Yet, on Apple Cocoa 
it seems that you can have multiple event queues within a single process.

Is this true or am I barking up a wrong tree?

Thanks for your comments

phil

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Re: Threading and Event Queue Question

[Phil Hystad]

You asked Why does this matter?  What are you trying to accomplish?

The matter part is that I am just curious and I am not trying to accomplish or 
do anything.  The question came up when I noticed the different behavior of 
tabbed windows on browser differences and I asked a question of a guy at work 
whose answer led me to think that maybe Windows and Cocoa managed their run 
loops differently.  That is why I asked the question.

thanks for the comments.


On Aug 3, 2010, at 1:59 PM, Nick Zitzmann wrote:

 
 On Aug 3, 2010, at 2:40 PM, Phil Hystad wrote:
 
 I am not an experienced programmer in Cocoa -- I have only dabbled.  But, I 
 have a question with regard to how event queue (terminology may not be 
 correct) is done differently then a windows platform.
 
 I think you meant run loop here.
 
 As an example, I noticed that each separate Tab of a Chrome browser instance 
 is itself a separate process.  Yet, each separate tab of Safari seems to be 
 folded into the single Safari process.  I have also noted that tabs in 
 Safari are totally independent of each other such that I can be playing 
 music from Pandora on one tab and watching a Netflix movie in another tab of 
 the same Safari instance.
 
 And they're all using the same run loop, with the following exceptions:
 
 1. CoreAudio will take audio queues from any thread, but only plays them in a 
 background thread.
 2. If Safari is running as a 64-bit app, then it runs 32-bit NSAPI plugins in 
 a background task. That's how it continues to support 32-bit plugins such as 
 Flash and Silverlight within a 64-bit task.
 
 From my knowledge of the MS Windows platform (WPF for example), this cannot 
 be done.  That is, a process has a single event queue from which events are 
 dispatched (control events like mouse, timer, and so on).  Yet, on Apple 
 Cocoa it seems that you can have multiple event queues within a single 
 process.
 
 Yes and no. There can be multiple run loops, but there can be only one run 
 loop per thread. Although background threads can have run loops, IIRC they 
 can't listen for GUI events, so they can only really used for timers, etc. 
 But in practice, run loops in threads other than the main thread are quite 
 rare.
 
 Is this true or am I barking up a wrong tree?
 
 Why does this matter? What are you trying to accomplish?
 
 Nick Zitzmann
 http://www.chronosnet.com/
 

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Re: Memory management on returning nil in init

[Phil Hystad]

Does this mean we don't get to find out what the ok variable is all about?  If 
the ok variable has meaning then the code would be much better written as 
something like:

-(id) initWithBool:(BOOL)ok
{
if ( !ok ) return nil;
...rest of code...
}



On Jun 21, 2010, at 7:55 AM, Eiko Bleicher wrote:

 Thank you all, this gives me confidence in my code.
 
 I was just hesistant because I didn't call alloc in the initializer - but 
 that's probably one of the reasons why you always use alloc/init together 
 when calling. :-)
 
 Thanks to everyone who responded.
 Eiko
 
 
 Am 21.06.2010 um 16:51 schrieb Markus Hanauska:
 
 
 On Monday, 2010-06-21, at 16:43, Eiko Bleicher wrote:
 
 -(id) initWithBool:(BOOL)ok
 {
 if (self = [super init])
 {
if (!ok) {
   return nil; // Point of interest
}
 }
 return self;
 }
 
 Does this code leak?
 
 According to my understanding of Cocoa, it does leak. You should call [self 
 release], as otherwise the just created object (the object has already been 
 created by [CLASS alloc] when init is being called) is never released 
 otherwise. Further no other object that [super init] might create is 
 released. My inits usually look like this:
 
 - (id)initWithBool:(BOOL)ok
 {
 self = [super init];
 if (self) {
   if (!ok) {
 [self release];
 self = nil;
}
 }
 return self;
 }
 
 -- 
 Markus Hanauska
 
 
 
 
 
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Re: Memory management on returning nil in init

[Phil Hystad]

I do not understand your argument -- apparently the ok variable is input to 
this initWithBool method and this method DOES NOT alter the ok variable in any 
way.  Therefore, when you test the ok variable, you are testing a condition 
that is totally independent of anything that initWithBool might do.  But, you 
seem to be using it as a condition test that might be confused with the result 
of the [super init] message.  Thus, either this is a bug in your code in how 
the ok variable is being used or you are doing something else that defies 
understanding from the code fragment we have before us -- thus, my original 
question.  My question was not about how Obj-c works with memory management and 
when to properly do a release, that was another subject that was correctly 
answered by several others.


On Jun 21, 2010, at 9:08 AM, Eiko Bleicher wrote:

 That would leak. Shouldn't this instance be released? Alloc already did its 
 job if we get into init. On the other hand, we shouldn't call release, 
 because super wasn't initialized. So as of my (maybe limited) understanding 
 by now, doing the code after [super init] is the way to go.
 
 
 Am 21.06.2010 um 18:00 schrieb Phil Hystad:
 
 Does this mean we don't get to find out what the ok variable is all about?  
 If the ok variable has meaning then the code would be much better written as 
 something like:
 
 -(id) initWithBool:(BOOL)ok
 {
   if ( !ok ) return nil;
   ...rest of code...
 }
 
 
 
 On Jun 21, 2010, at 7:55 AM, Eiko Bleicher wrote:
 
 Thank you all, this gives me confidence in my code.
 
 I was just hesistant because I didn't call alloc in the initializer - but 
 that's probably one of the reasons why you always use alloc/init together 
 when calling. :-)
 
 Thanks to everyone who responded.
 Eiko
 
 
 Am 21.06.2010 um 16:51 schrieb Markus Hanauska:
 
 
 On Monday, 2010-06-21, at 16:43, Eiko Bleicher wrote:
 
 -(id) initWithBool:(BOOL)ok
 {
 if (self = [super init])
 {
  if (!ok) {
 return nil; // Point of interest
  }
 }
 return self;
 }
 
 Does this code leak?
 
 According to my understanding of Cocoa, it does leak. You should call 
 [self release], as otherwise the just created object (the object has 
 already been created by [CLASS alloc] when init is being called) is never 
 released otherwise. Further no other object that [super init] might create 
 is released. My inits usually look like this:
 
 - (id)initWithBool:(BOOL)ok
 {
 self = [super init];
 if (self) {
 if (!ok) {
   [self release];
   self = nil;
  }
 }
 return self;
 }
 
 -- 
 Markus Hanauska
 
 
 
 
 
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Re: iPhone/iPad: Desktop wallpaper can't be set.

[Phil Hystad]

I hope this feature is not supported.  The last thing I want is some 
application changing my desktop background which is my choice, not one of the 
application.  Yes, I know this can be done with some kind of dialog for 
approval but then that really stresses the logic of why you would want to do 
this -- OS X already provides a way for me to set my background, I don't need 
to buy or use an app to do that.

I vote no -- don't do it.

phil

On May 19, 2010, at 9:08 AM, David Duncan wrote:

 On May 19, 2010, at 7:55 AM, sebi wrote:
 
 A customer wants an app that changes the desktop background image. I told 
 him that is not possible (and probably won't be in the near future) because 
 that would mean to play outside the sandbox. Is this correct?
 
 
 Correct, this is not possible in the current API. I would recommend filing a 
 bug report asking for this capability.
 --
 David Duncan
 Apple DTS Animation and Printing
 
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NSString and Regular Expressions

[Phil Hystad]

I was sort of suspecting that regular expression matches would be supported by 
NSString yet I find no message interface for supporting regular expressions.  
So, is the only capability for handling regular expressions in Objective-C the 
Posix Regex library?

phil
phys...@mac.com

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File system file renaming question...

[Phil Hystad]

This question is not specifically about Cocoa programming but I hope that some 
Mac OS X experts out there can give me an answer.

I sent an attached photo to my daughter so that she could print it out using 
Costco print services.  I sent it at high resolution, the photo image was 1.6 
MB.  It seems that Mac mail changed the resolution to a more web friendly size 
of about 64 K with much reduced resolution.  So, I thought that a way to get 
around this was to change the file type (extension) of the image file to 
something other then .jpg such as .dat (and, I tried .zz, .q, and null).  
However, the file was still recognized and interpreted as a jpeg file and 
treated in the same manner by mail (and, also by the finder that displayed the 
image).

So, it looks like Mac OS X is interpreting the file based on contents and not 
based on file extension.  This seems to be a very wrong thing to do in my 
opinion.  Does anyone know of a way to turn this off or is this considered a 
feature for some ease-of-use aspect of OS 
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[iPhone] Why so many calls?

[Phil Curry]

I did this just for grins to see what I came up with. Boy was I  
surprised!


Here's a listing of the calls made loading a table with 2 sections  
where the first section has 1 row and the second has 2 rows. Each  
section has a header title and a footer title.


NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: initWithStyle:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: viewDidLoad
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: viewWillAppear:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: numberOfSectionsInTableView:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: viewDidAppear:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: numberOfSectionsInTableView:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:titleForHeaderInSection:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:titleForHeaderInSection:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:titleForFooterInSection:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:titleForFooterInSection:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:numberOfRowsInSection:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:titleForHeaderInSection:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:titleForHeaderInSection:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:titleForFooterInSection:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:titleForFooterInSection:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:numberOfRowsInSection:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:titleForHeaderInSection:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:cellForRowAtIndexPath:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:cellForRowAtIndexPath:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:cellForRowAtIndexPath:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:titleForHeaderInSection:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:titleForFooterInSection:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:titleForHeaderInSection:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:titleForFooterInSection:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:titleForHeaderInSection:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:titleForFooterInSection:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:titleForHeaderInSection:
NavBasedTestBed37232:20b  Object: RootViewController: 0x3d1d3a0  
Received: tableView:titleForFooterInSection:


To summarize, there are:
9 tableView:titleForHeaderInSection:
8 tableView:titleForFooterInSection:
2 numberOfSectionsInTableView:
2 tableView:numberOfRowsInSection: -// I hope we all agree
3 tableView:cellForRowAtIndexPath: --// these make sense

But can anyone explain all the other duplicate calls?

Waiting with baited breath.
-Phil
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Re: [iPhone] Why so many calls?

[Phil Curry]

But can anyone explain all the other duplicate calls?


Why does it matter?  If you have eight or nine sections it makes
perfect sense.  Or you could have one section and it needs to draw
multiple times, and whoever designed the API didn't want to go through
the expense of a KVO observation, instead asking the delegate for the
header/footer each time it needed it.

But none of that matters.

Kyle-

But, as I thought I explained in the original post, the table only has  
2 sections, 1 with 2 rows and 1 with 1 row.

The table is only being loaded once. So why does it take:

9 tableView:titleForHeaderInSection: calls for 2 sections
8 tableView:titleForFooterInSection: calls for 2 sections
2 numberOfSectionsInTableView: calls for a single load

In a table of this size, you're right - Why does it matter.
But what if my real table has 99 sections? Why should I get bogged  
down with 800-900 calls for section header titles and section footer  
titles.
Seems like an incredible waste of effort. Just curious if anyone knows  
why this happens. If you don't know why, just say so.


I happen to live in a world of disturbing images. What can I say?
-Phil
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Re: what is this currency symbol?

[Phil Dokas]

On Jul 21, 2009, at 11:53 AM, Andy Lee wrote:


¤


…is the all-purpose currency sign in unicode. Its use is to denote  
that the attached number is a currency value when the appropriate  
symbol for the locale isn't available.


--
Phil Dokas -//- p...@jetless.org

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Interface Builder Questions...

[Phil Hystad]

I am new to Interface Builder and I am still trying to figure out some  
subtle details of how things work.  And, my frustration level is  
growing because although I have access to a very rich set of  
documentation, a number of questions I have pondered are not  
answered.  Some of these may be rather silly but remember I am very  
new to Cocoa and Interface Builder.


(1)  The default Cocoa Application created by Xcode creates a simple  
application with a single window and a default menu (among other  
things I presume).  This window has a content view which I am assuming  
is an instance of NSView but I actually can't find out if that is  
true.  Therefore, are there any inspectors that tell me the actual  
class used for a particular view.  The class identity part of the  
Inspector for the content view suggests has a drop down that allows me  
to choose various classes but there must be a specific class that is  
used already.  How do I find this?


(2)  I am trying to understand how the window sizing features of the  
view inspector relate to the window itself.  As best as I can tell,  
none of the actual window sizing features for the content view are  
usable as they do not really seem to do anything.  Is this true?  Is  
it possibly the case that the content view, being bound to the window  
frame, is sized automatically based on the window size?



(3)  Again, on the window sizing inspector, if I resize the window  
using the resize thingy in the lower right hand corner, I can see the  
updated pixel size in the inspector, but only after I stop resizing.   
If I want to resize to a particular dimension, say 300 x 225 (or,  
whatever), it is a try this, check, try that check, and so on.  Is  
there a way to enable the size values of height and width to resize  
dynamically as I change the window size?  I have looked all over the  
documentation and tried a lot of things but nothing seems to make the  
behavior different.


(4)  And, finally, on the window sizing inspector, in the part called  
autosizing when I click on the content view (remember, it is empty,  
just as created by Xcode), there is an animated image that expands and  
contracts  in size and I have absolutely no idea why it is animated or  
what it means.  Any help?


Thanks,
InterfaceBuilder newbie phil

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Re: Interface Builder Questions...

[Phil Hystad]

(3)  Again, on the window sizing inspector, if I resize the window  
using the
resize thingy in the lower right hand corner, I can see the  
updated pixel
size in the inspector, but only after I stop resizing.  If I want  
to resize
to a particular dimension, say 300 x 225 (or, whatever), it is a  
try this,
check, try that check, and so on.  Is there a way to enable the  
size values
of height and width to resize dynamically as I change the window  
size?  I
have looked all over the documentation and tried a lot of things  
but nothing

seems to make the behavior different.


Don't think so.  File a radar: http://bugreport.apple.com  You can
also enter the values directly in the text fields.



Good suggestion. Note though, that if you already know the dimension  
you want to use, it's probably easier to set it using the numeric  
input fields in the inspector directly. Also note that if you hold  
down the Command key while resizing in IB it will resize smoothly,  
and not snap to guides. This often makes pixel resizing / alignment  
a lot easier.





So, are you telling me that everyone else can see dynamic changes to  
these height and width pixel values but I can't?  I would submit that  
it is a little early to submit a bug report -- certainly there must be  
something I am not doing right.  Yes, I know that I can enter them in  
manually but I am more interested in trying to figure out if anything  
is broken with my IB or not.  Maybe I am seeing normal behavior.  But,  
if this is normal, it sure seems to be very awkward which does not  
seem like IB or Xcode.


phil

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Opinion on managed memory and garbage collection

[Phil Hystad]

Being relatively new to Cocoa and Objective-C, what is the consensus  
on using the new version 2.0 managed memory features (garbage  
collection).


If you were writing a new Cocoa application from scratch, would  
garbage collection be the preferred method over the reference counting  
(retain/release) method.  Having spent years in Java I would prefer a  
GC'd approach but I have also seen the great improvement of GC in Java  
over the years.  Therefore, I am also curious on how the new Objective- 
C design for GC compares.


The applications I have in mind are mostly graphic (Quartz 2D)  
oriented and likely also some OpenGL work.


Thanks for your opinions and comments.

phil
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Creating table rows from XML

[Phil Dokas]

Hello all, I'm writing my first iPhone application and I've run into a  
problem I can't seem to get a grasp on.


In short I want to parse an XML file and display a UITableView with  
data from a set of XML elements. I've got all the code written for  
this but whenever I try to access my array of data inside of - 
tableView:cellForRowAtIndexPath: I crash without an error message in  
console.




Here are the two relevant classes:

@interface PDPagesViewController : UITableViewController {
  NSData* received_data;
  NSMutableArray* pages;
}
- (void)beginParsing;
@end

@interface PDPage : NSObject {
  NSNumber* page_id;
  NSString* title;
}
@property(nonatomic,retain) NSNumber* page_id;
@property(nonatomic,copy) NSString* title;
-(id)init;
-(id)initWithID:(int)in_id andTitle:(NSString*)in_title;
@end



I init my PDPagesViewController as follows:

- (id)init {
  if (self = [super init]) {
pages = [[NSMutableArray alloc] init];
[self beginParsing];
  }
  return self;
}

I construct my NSURLRequest and setup my parser inside of  
beginParsing. Here is the delegate method which then builds my array:


- (void)parser:(NSXMLParser *)parser
didStartElement:(NSString *)elementName
  namespaceURI:(NSString *)namespaceURI
 qualifiedName:(NSString *)qName
attributes:(NSDictionary *)attributeDict
{
  // Handle page elements
  if ([elementName isEqualToString:@page]) {
NSString *titleAttr = [attributeDict objectForKey:@title];
NSString *idAttr = [attributeDict objectForKey:@id];
if (titleAttr  idAttr) {
  PDPage* newPage = [[PDPage alloc] initWithID:[idAttr intValue]  
andTitle:titleAttr];

  [pages addObject:newPage];
  [newPage release];
}
return;
  }
}

Insofar as I can tell, everything is ok so far. The problem occurs in  
this table delegate method (again, part of PDPagesViewController),  
with crashing lines and received output listed in comments:


- (UITableViewCell *)tableView:(UITableView *)tableView  
cellForRowAtIndexPath:(NSIndexPath *)indexPath

{
  static NSString *CellIdentifier = @Cell;

  UITableViewCell *cell = [tableView  
dequeueReusableCellWithIdentifier:CellIdentifier];

  if (cell == nil) {
cell = [[[UITableViewCell alloc] initWithFrame:CGRectZero  
reuseIdentifier:CellIdentifier] autorelease];

  }

  // Set up the cell...
  NSLog(@Setting up table cell %d, [indexPath row]);  // Setting  
up table cell: 8
  NSLog(@retain count: %d, [pages retainCount]);  // retain count:  
1

  NSLog(@array count: %d, [pages count]);  // array count: 16
  NSLog(@page retain count: %d, [(PDPage*)[pages objectAtIndex: 
[indexPath row]] retainCount]);  // page retain count: 1
  NSLog(@title: %@, [(PDPage*)[pages objectAtIndex:[indexPath row]]  
title]);  // This line causes a crash
  NSLog(@pages array right now: %@, pages);  // This line causes a  
crash
  cell.text = [[pages objectAtIndex:[indexPath row]] title];  // This  
line causes a crash

  return cell;
}


It seems to me that whenever I try to interact with my NSMutableArray  
as such in this method it crashes, but when I use only its NSObject  
methods it's fine. And yet, it and its contents have the right retain  
count. I feel like I must be missing something basic, so any insight  
would be much appreciated. Thank you!


--
Phil Dokas -//- p...@jetless.org

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Re: SSH Tunnel

[Phil]

On Sat, Feb 21, 2009 at 7:23 PM, Seth Willits sli...@araelium.com wrote:
 Does anyone have any experience with this? Am I barking up the wrong tree
 trying to use the command line app to do it? Perhaps I should be using a
 yet-to-be-discovered library instead.


There are a number of SSH libraries that may meet your needs, for example:
http://0xbadc0de.be/wiki/libssh:libssh
http://www.libssh2.org/

Phil
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Re: best way to do precise timing on iphone?

[Phil]

On Fri, Feb 6, 2009 at 1:06 AM, Memo Akten m...@memo.tv wrote:
 Hi ALl, i'm aware that on desktop using mach_absolute_time() is the way to
 go for precise timing of code
 (http://developer.apple.com/qa/qa2004/qa1398.html) but I was wondering what
 is the alternative for iphone? not sure if this is the right place to post,
 but Id gladly repost if someone could point me to the right place. I'm
 guessing NSDate isn't going to be that accurate for this kind of stuff...

You can use mach_absolute_time() on the iPhone.

Future questions about iPhone development should be directed to the
developer forums though:
https://devforums.apple.com/

Phil
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Re: NSWindow With Only Close Button?

[Phil]

On Mon, Jan 12, 2009 at 1:18 PM, Chunk 1978 chunk1...@gmail.com wrote:
 i noticed the window of the OS Install Assistant of Parallels 4.0 only
 has a close button in the top left corner of the window.  i didn't
 know this was possible.  how is this accomplished?


With the exception of Panels, this is discouraged by the Apple HIG
(Title Bar Buttons subsection):
http://developer.apple.com/documentation/UserExperience/Conceptual/AppleHIGuidelines/XHIGWindows/chapter_18_section_4.html

Phil
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NSLog ??

[Phil Hystad]

Why can't I find any reference page for NSLog?  I believe I have  
searched all over all documentation that I have and the closest match  
is NSLogicalTest.   I even tried a search using Spotlight on my entire  
system.  I was able to find a usage of NSLog in a program but no  
documentation hits.


Help needed for snowed in beginning Cocoa programmer.

-phil-
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The Ages Old __MyCompanyName__ Question

[Phil Hystad]

OK, I am fairly new to Xcode and Cocoa programming and I want to  
change the __MyCompanyName__ template macro definition.


So, I google this question, find answers, and try it out.  It did not  
work.  So, is there something different in today's Xcode that means  
the procedure for changing __MyCompanyName__ is different.  I think  
the most recent entry I found (with a date) was 2005 or so.


The procedure I tried was to set ORGANIZATIONNAME in the  
PBXCustomTemplateMacroDefinitions key of the Xcode plist.  First, I  
could not find it by looking at the plist.  So, I tried the defaults  
command from the shell and this seemed to work but no change in  
behavior on Xcode in spite of cycling Xcode and trying a number of  
other things.


So, How do you change __MyCompanyName__?

Thanks,
phil
phys...@mac.com

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Re: How to get a list of all known file types?

[Phil]

On Fri, Nov 7, 2008 at 2:12 PM, Chris Idou [EMAIL PROTECTED] wrote:

 I've got an app which is matching on file types, so I want the user to be 
 able to say show me all the... say... MS-Word documents, or JPeg images or 
 whatever. So I need to present the user with all the possible types their 
 system knows about, so they can select what files they are interested in.


IIRC, this question has come up before and there doesn't appear to be
a way to get a list of all known UTIs from Launch Services.

The 10.4 version of Finder appeared to have some private way of
getting this list, however, the list was mostly useless for browsing
through due to the inordinate number of UTIs that applications/bundles
had declared.

Phil
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Re: Porting from Windows to Mac

[Phil]

On Sat, Nov 1, 2008 at 11:35 PM, Rakesh Singhal
[EMAIL PROTECTED] wrote:
 Do I need to change the existing code (Windows code) very much. I have not
 used Qt before this. Does Qt support the MFC?


If your code is written for MFC, then any code that depends on it will
require re-writing---regardless of the approach you choose.

Qt is one of many UI frameworks that allow cross-platform development
(personally, I prefer GTK+). However, if your code is already written
against the MFC framework, then you will need to re-write your UI
code. Coding against a framework like Qt makes maintence of the code
easier, but doesn't help you much if you already have a large existing
codebase written for another framework.

Phil
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Re: Storing Instances of a structure in a file

[Phil]

On Sun, Sep 21, 2008 at 9:13 PM, Adil Saleem [EMAIL PROTECTED] wrote:
 Hi,

 I want to store instances of a structure in a file so that my application can 
 retreive them and read them.(Basically they are different configuration 
 presets for the application) I also want each instance that is stored to be 
 unique. I know this becomes a typical database problem but i don't want to 
 use database.

 Is there any Cocoa API that can help me with this problem ? I know it can be 
 done in plain C language, but that would be lengthy and error-prone. If there 
 is anything in Cocoa that can help me, it would be great.


If you're talking about plain-C structs then you can wrap them up in
NSValue or NSData instances, which you can then write out with an
NSCoder (or if you have lots of them, put them into an NSArray and do
the same).

Phil
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Re: Storing Instances of a structure in a file

[Phil]

On Sun, Sep 21, 2008 at 11:09 PM, Adil Saleem [EMAIL PROTECTED] wrote:
 And what if the fields in structures are instances of Cocoa classes (like
 NSNumber etc) ?


Do you have to use structs, or can you wrap them up in an Objective-C
class that implements NSCoding?

Phil
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Re: Storing Instances of a structure in a file

[Phil]

On Sun, Sep 21, 2008 at 11:21 PM, Adil Saleem [EMAIL PROTECTED] wrote:
 I will have to use structs.


Then you will have to write your own code to handle any fields that
are pointers to values/objects that exist elsewhere.

Phil
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Re: structs in Mutable containers

[Phil]

On Tue, Sep 16, 2008 at 9:18 PM, Christian Giordano
[EMAIL PROTECTED] wrote:
 Hi guys, I'm finding myself trying to add to mutable containers like
 NSMutableDictionary or NSMutableArray instead of NSObjects subclasses,
 just structs. For instance in a NSMutableDictionary the key was an
 integer defined with #define. In this case I sort it with:

 ... forKey:[[NSNumber alloc] initWithInt:BAND_RED]];

 Not a really elegant solution but I can understand that those
 containers require pointers.


You should really be using NSValue's for this. Take a read of:
http://developer.apple.com/documentation/Cocoa/Conceptual/NumbersandValues/Articles/Values.html

 Now I need to create a NSMutableArray of CGPoint, how can I make it
 became a pointer?

 ... addObject:CGPointMake(x,y)];


See NSValue's +valueWithPoint:

Phil
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Re: structs in Mutable containers

[Phil]

On Tue, Sep 16, 2008 at 10:46 PM, Christian Giordano
[EMAIL PROTECTED] wrote:
 I just realized valueWithPoint is not available on the iPhone SDK


It's just a convenience method for something like:
[NSValue valueWithBytes:somePoint objCType:@encode(NSPoint)]

You can implement this yourself in a category of NSValue.

Phil
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Re: structs in Mutable containers

[Phil]

On Wed, Sep 17, 2008 at 12:41 AM, Phil [EMAIL PROTECTED] wrote:
 [NSValue valueWithBytes:somePoint objCType:@encode(NSPoint)]


Should be:
NSPoint somePoint = NSMakePoint(x,y);
[NSValue valueWithBytes:somePoint objCType:@encode(NSPoint)];

Phil
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Re: Best 'native' formats for NSImage and NSSound?

[Phil]

On Tue, Sep 2, 2008 at 5:18 AM, Matt [EMAIL PROTECTED] wrote:
 In running Shark on my app recently I noticed that by far, my app spent most
 of its time in: CGSConvertBGR888toRGBA.


This has come up on the quartz-dev mailing list:
http://lists.apple.com/archives/quartz-dev/2006/Jul/msg00055.html

Where there was a suggestion that you can get much better performance
through OpenGL with some Apple extensions:
http://lists.apple.com/archives/quartz-dev/2006/Jul/msg00060.html

Phil
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Re: How to create a GUID?

[Phil]

On Tue, Sep 9, 2008 at 12:13 AM, Chris Suter [EMAIL PROTECTED] wrote:
 On Leopard (and possibly earlier–I haven't checked), it appears that the
 string returned is actually a UUID created with the CFUUID functions
 concatenated with the process ID and the result of mach_absolute_time() so
 the result isn't a proper UUID. I'm not sure where the host name is coming
 from; it's possible that the CFUUID functions incorporate it somehow.


The documentation doesn't specify any particular format for the string
returned, only the information used to seed it---I wouldn't recommend
depending on this method always returning a UUID incase this changes
(even though it probably won't).

Phil
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Re: How did I miss this?

[Phil]

On Mon, Sep 8, 2008 at 1:25 PM, John Murphy [EMAIL PROTECTED] wrote:
 I just released the the view on NSViewController objects can be accessed with 
 dot syntax, i.e., self.view instead of [self view].
 Has this always been the case? I don't see any listing of Properties in 
 documentation.
 I'm hitting myself for not discovering it sooner.


This is accidental, from the way the compiler translates self.view
into [self view]. Properties are just syntactic sugar.

The documentation on the dot syntax explains this:
http://developer.apple.com/documentation/Cocoa/Conceptual/ObjectiveC/Articles/chapter_2_section_3.html#//apple_ref/doc/uid/TP30001163-CH11-SW17

The sub-section on Incorrect Use, also explains that you shouldn't
use this syntax if it's not on a declared property (and
NSViewController doesn't have any).

Phil
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Re: How did I miss this?

[Phil]

On Mon, Sep 8, 2008 at 3:23 PM, mmalc crawford [EMAIL PROTECTED] wrote:

 On Sep 7, 2008, at 7:01 PM, Phil wrote:

 The sub-section on Incorrect Use, also explains that you shouldn't
 use this syntax if it's not on a declared property (and
 NSViewController doesn't have any).

 I'm not sure where you got this from?
 It is certainly not incorrect to use the dot syntax if there is not a
 declared property.

 The introduction states:
 Objective-C provides a dot (.) operator that offers a compact and
 convenient syntax you can use as an alternative to square bracket notation
 ([]s) to invoke accessor methods.


Hmm, I seem to have interpreted the patterns under incorrect use as
being a bit broader than they actually are.

Phil
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Re: string convertion: converting getter name to setter

[Phil]

On Fri, Sep 5, 2008 at 12:40 PM, steph thirion [EMAIL PROTECTED] wrote:

 from the selector of a given getter function, I need to get the selector of
 the equivalent setter function. For instance, from color I should get
 setColor.


I assume you want to do more with the selector than just invoke
it---otherwise you can just use KVC and save yourself some grief.
There are a few cases you may encounter here:
 1. There is no setter.
 2. There is a setter and the class is KVC compliant for the key.
 3. There is a setter and the class isn't KVC compliant for the key,
but there is a setter defined as part of a property definition.
 4. (3) but without the property definition.

 char* getterName = sel_getName(getterSelector);


Instead of using C strings, you can use NSStrings and
NSSelectorFromString() and NSStringFromSelector()---making string
manipulation much easier. However, for case (3), you'll need to do
some parsing of the property attribute list from
property_getAttributes().

 What would be the less costly way, performance wise, to convert the C string
 color to setColor?

 I have no experience in working with strings in objc, and was hoping someone
 would point me in the right direction before I start.

If you're working in Cocoa (and I assume you are, since this is a
cocoa-dev list), this is a good starting point:
http://developer.apple.com/documentation/Cocoa/Conceptual/Strings/

Phil
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Re: string convertion: converting getter name to setter

[Phil]

On Fri, Sep 5, 2008 at 1:27 PM, Andrew Merenbach
[EMAIL PROTECTED] wrote:
 SEL getterSel = @selector(balloonColor);
 NSString *getterName = NSStringFromSelector(getterSel);
 NSString *setterName = [@set stringByAppendingString:getterName];
 SEL setterSel = NSSelectorFromString(setterName);



Selector's are case-sensitive, so you'll have to do...

setterName = [@set stringByAppendingString:[getterName capitalizedString]];

Phil
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Re: string convertion: converting getter name to setter

[Phil]

On Fri, Sep 5, 2008 at 1:53 PM, Steve Weller [EMAIL PROTECTED] wrote:

 From memory I think that does not work: capitalizedString also decapitalizes
 all but the first character, so capitalizedString will become
 setCapitalizedstring instead of setCapitalizedString.


Gah, you're right! I guess the only way to do it then is with an
NSMutableString:

NSMutableString *getterName = [NSStringFromSelector(...) mutableCopy]
[getterName replaceCharactersInRange:NSMakeRange(0, 1)
withString:[[getterName substringToIndex:1] uppercaseString]];

Maybe it is easier with C strings:

const char *getterName = sel_getName(...)
char *getterName_m = strdup(getterName);
getterName_m[0] = toupper(getterName_m[0]);
// and clean up...

Phil
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Re: Accessing SDL Frameworks Bundled with Leopard...

[Phil]

On Fri, Sep 5, 2008 at 4:04 PM, John Joyce
[EMAIL PROTECTED] wrote:
 Does anybody know any official or proper way to link to the SDL framework
 that is bundled in the root library in Leopard?
 /Library/Frameworks/SDL.framework
 is surprisingly, there!


Not on my system. /Library/Frameworks is typically for frameworks
shared by installed applications on the system, the frameworks that
come bundles with the system are in /System/Library/Frameworks.

Something else has probably installed SDL.framework. I would suggest
getting your own copy of the SDL framework to use.

Phil
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Re: string convertion: converting getter name to setter

[Phil]

On Fri, Sep 5, 2008 at 2:51 PM, steph thirion [EMAIL PROTECTED] wrote:
 I was trying to go with performSelector, but just a while ago I was stunned
 to find out there's no way to pass along an argument that is a basic type.
 Same with NSInvocation, AFAIK you can only pass objects. And I'd rather
 avoid having NSNumber instances instead of simply int variables just because
 of that. Using an instance where I simply need an int or a float seems a
 waste of memory and performance, correct me if I'm wrong.


You can use +instanceMethodForSelector: to get a function that you can
use to call the method with primitive arguments---see the overview
section of the NSObject class reference.

 Then there's KVC. Which I haven't been able to pull out because of some int
 / id problems in arithmetics that I couldn't understand yet. But the concept
 of KVC seems like it could be costly, at least more than pointing directly
 to the right door, like performSelector or NSInvocation does.

However, finding the correct door is probably just as costly (or
potentially more than) KVC. I'd suggest avoiding developing your own
solution unless you know there's a problem with using what's provided
by the framework.

If you can tell us a bit more about what you're trying to accomplish,
we might be able to suggest some better approaches.

Phil
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Re: Message stack limitations

[Phil]

On Wed, Sep 3, 2008 at 9:23 PM, RGA [EMAIL PROTECTED] wrote:
 Putting aside for now whether this is the right way to implement, my
 question is how are messages processed?  What is the maximum stack depth for
 number of recursive messages?  How is this affected by the introduction of
 64bit frameworks?  Is there a way to see the current stack depth
 auto-magically?  What happens in the event of the message handling stack
 becoming full and is there a way to deal with this event?


Some of these questions are answered in QA1419:
http://developer.apple.com/qa/qa2005/qa1419.html

Although you may think of the stack in terms of stack-frames, what
really matters to the operating system is the memory footprint of the
stack (since each frame isn't a constant size---it varies depending on
the memory requirements of the called method). You can examine the
current stack (in terms of frames---more specifically, return
addresses) using backtrace(3):
http://developer.apple.com/documentation/Darwin/Reference/ManPages/man3/backtrace.3.html

Generally though, if you're hitting the stack size limit, you're doing
something wrong.

Phil
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Re: accessing netinfo db from cocoa?

[Phil]

On Sun, Aug 31, 2008 at 8:57 PM, Kieren Eaton [EMAIL PROTECTED] wrote:
 I am trying to find a way to access the netinfo DB from cocoa.  Specifically
 the sharing (AFP, SMB, etc).
 know that server has the command line util 'sharing' for just this purpose.
 unfortunately this command is not available in the Client version of os x :(


You'll probably be able to get the information you want out of the
DirectoryService framework:
http://developer.apple.com/documentation/Networking/Conceptual/Open_Directory/

Phil
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Re: Busy doing nothing

[Phil]

On Fri, Aug 29, 2008 at 9:42 PM, Gerriet M. Denkmann
[EMAIL PROTECTED] wrote:
 If I add these magic lines it will use 0.2% of my Cpu just doing nothing:

NSMetadataQuery *query = [ [ NSMetadataQuery alloc] init];
[ query startQuery ];
[ query stopQuery ];
NSArray *results = [ query results ];   //
  _NSMetadataQueryResultArray
[ query release ];

 From now on until quit I get every 100 msec  one Context Switch and two Mach
 System Calls - as observed via Activity Monitor.


It's noted in the documentation that using -results is not
recommended due to performance and memory issues. My guess is that
Spotlight might be keeping something alive for it; you might want to
post this on the Spotlight-dev list, that's where the people who know
about Spotlight behind-the-scenes tend to hang out.

Phil
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Quitting all active applications

[Phil Faber]

Is there a simple way to quit all running applications?

Basically I want to achieve the same result as the first stage of  
hitting 'shut down' (closing all applications) without actually  
shutting down the system.


Thanks.
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Re: Quitting all active applications

[Phil]

On Thu, Aug 28, 2008 at 10:36 PM, Phil Faber [EMAIL PROTECTED] wrote:
 Is there a simple way to quit all running applications?

 Basically I want to achieve the same result as the first stage of hitting
 'shut down' (closing all applications) without actually shutting down the
 system.


What do you mean by all running applications? There are GUI
applications, background daemons owned by the user, applications of
other users, system processes, etc.

Also, what do you mean by quit? Do you want to force quit them, or
tell them to gracefully quit? (During the shutdown process,
applications have the opportunity to cancel the event). And depending
on the type of application, the preferred way of getting them to quit
changes.

What are you trying to achieve here?

I would suggest reading Apple's documentation of the shutdown process at:
http://developer.apple.com/DOCUMENTATION/MacOSX/Conceptual/BPSystemStartup/Articles/BootProcess.html

Phil
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Re: Creating Interface

[Phil]

On Fri, Aug 29, 2008 at 12:32 AM, Jean-Daniel Dupas
[EMAIL PROTECTED] wrote:
 When you use the idprotocol syntaxt, the compiler assume your object only
 implements the method declared in your protocol.
 If you want to use some other function, you have to use an object type that
 declare thoses functions, for example in your case, NSObject.


However, NSObject is both a class and a protocol. Although most
classes inherit from NSObject, this is not always the case (for
example, using DO, where objects inherit from the NSProxy root class).

It's preferrable if your protocol incorporates the NSObject protocol
as well, which enforces all implementors to also conform to the
NSObject protocol (and you take an idMyProtocol)---because you don't
actually care if you have an NSObject subclass, just that whatever
you've got behaves like an NSObject.

Phil
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Re: Quitting all active applications

[Phil Faber]

Yes I agree it could be most annoying in the majority of cases to quit  
other people's apps!


All I'm trying to achieve is a tiny app that only quits open apps and  
then quits itself; the purpose being when I want to release as much  
memory and disc space as possible before I run another memory /  
processor intensive app.  I could just quit each one individually but  
I guess I'm lazy!


I'm not suggesting anything more sinister!

Thanks to you  everyone for the advice.

Phil




On 28 Aug 2008, at 12:12, Rob Keniger wrote:


On 28/08/2008, at 8:36 PM, Phil Faber wrote:


Is there a simple way to quit all running applications?

Basically I want to achieve the same result as the first stage of  
hitting 'shut down' (closing all applications) without actually  
shutting down the system.



You could get the launched applications by using [[NSWorkspace  
sharedWorkspace] launchedApplications] and then send each of them a  
Quit Apple Event.


But why would you want to do this? It is possibly one of the most  
annoying things you could do to someone's machine and you would want  
to have a very, very good reason for it.


--
Rob Keniger


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Re: File Extensions Problem

[Phil]

On Thu, Aug 28, 2008 at 10:59 AM, R.L. Grigg
[EMAIL PROTECTED] wrote:
 Hmm, I guess the wrinkle in this particular case is if the contract doesnt
 specify something that the programmer assumes to be safe to do (like
 enumerating backwards), how can you know how to implement your end? I guess
 there are times when the underlying implementation details can/must
 influence your highlevel design?


If the contract doesn't specify something, then the only thing that's
safe to assume is that it's not supported.

I'd argue that implementation details shouldn't influence higher-level
design if the contract is well-specified. Although, it's probably
unavoidable that it happens---but, you want to make sure that your
design doesn't *depend* on an implementation detail that's not
specified in the contract.

Phil
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Re: how to release CFData

[Phil]

On Wed, Aug 27, 2008 at 4:26 PM, lajos kamocsay [EMAIL PROTECTED] wrote:
 I have found several ways to create CFData, but how do I release
 a CFDataRef?


CFRelease(). More information about Core Foundation's memory
management functions is available in the following guide:
http://developer.apple.com/documentation/CoreFoundation/Conceptual/CFMemoryMgmt/

Phil
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Re: 64-bit = Objc 2.0????

[Phil]

On Tue, Aug 26, 2008 at 1:18 AM, Stéphane Sudre [EMAIL PROTECTED] wrote:
 Probably a stupid question but I don't see anything in the objc headers or
 in some old slides corroborating this.

 When you build a project for a 64-bit architecture (such as x86_64), does
 this imply the Objective-C version for this architecture is going to be 2.0?


When you compile for 10.5, Objective-C 2.0 is implied. When compiling
for 64-bit, several other things are implied, but it's all Objective-C
2.0:
http://developer.apple.com/releasenotes/Cocoa/RN-ObjectiveC/
http://developer.apple.com/documentation/Cocoa/Conceptual/ObjectiveC/Articles/chapter_5_section_7.html

Phil
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Re: CFBoolean

[Phil]

On Mon, Aug 25, 2008 at 1:33 PM, Chris Idou [EMAIL PROTECTED] wrote:
 How do I create a property in the user defaults of type boolean?

 Internally it seems to use a NSCFBoolean which is an undocumented type. If I 
 make the assumption it is the same as a CFBoolean, and overlooking the 
 oddness of having to fall back to Carbon for such a fundamental thing, the 
 documentation of CFBoolean doesn't seem to provide a documented method for 
 creating one.


There's a table of Cocoa/CoreFoundation types and their XML property
list representations at:
http://developer.apple.com/documentation/Cocoa/Conceptual/PropertyLists/Articles/XMLPListsConcept.html

I'm curious as to why you need a boolean, rather than just what
-setBool:forKey: gives you?

Phil
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Re: Implementing isEqual: and hash

[Phil]

On Sat, Aug 23, 2008 at 11:41 PM, Graham Cox [EMAIL PROTECTED] wrote:
 I have a class for which equality can be defined as having the same internal
 string value (which happens to be a UUID-turned-string). I can easily
 implement isEqual: based on that but the docs say I also need to implement
 -hash. Any pointers on what is a good way to do that? Could I just safely
 defer to the -hash returned by the string in question?


If you're deferring both -isEqual: and -hash to an NSString, you'll be
fine. Hash doesn't need to be anything complicated (although a good
distribution is nice), just as long as two objects that return YES for
-isEqual: return the same value for -hash (the inverse doesn't have to
be true).

Phil
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Re: File Extensions Problem

[Phil]

On Fri, Aug 22, 2008 at 7:28 PM, Graham Cox [EMAIL PROTECTED] wrote:
 Or just use reverseObjectEnumerator. Removing the current iteration item
 from the array while iterating backwards is OK.


Even going backwards, it's still not ok...

From the -reverseObjectEnumerator 'special considerations' section of
the documentation:
When you use this method with mutable subclasses of NSArray, you must
not modify the array during enumeration.

And from NSEnumerator:
Some enumerators may currently allow enumeration of a collection that
is modified, but this behavior is not guaranteed to be supported in
the future.

Phil
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Re: File Extensions Problem

[Phil]

On Fri, Aug 22, 2008 at 6:29 PM, Adil Saleem [EMAIL PROTECTED] wrote:
 Currently what i am doing is that i am getting the file names in an 
 NSMutableArray using NSFileManager function directoryContentsAtPath

 I get the list, but the problem is that it get all the files. I want only 
 those files that have a certain extension (for example mp4, mp3). How can i 
 do that.


I'd recommend using -enumeratorAtPath: and adding each path that meets
your criteria to a new array.

Also, consider if you want to check for a particular file extension,
or a particular file type: do you just want files ending in .mp3, or
any valid MP3 file? If you want the latter, then you should
investigate checking the file extensions for conformance against the
particular UTIs you're interested in. The documentation for UTIs isn't
great, but take a look at the UTType.h and UTCoreTypes.h header files.

Phil
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Re: File Extensions Problem

[Phil]

On Fri, Aug 22, 2008 at 10:23 PM, Graham Cox [EMAIL PROTECTED] wrote:
 You shouldn't go modifying the array in general, for sure. But the special
 case of modification by deleting the last item in the array is safe, and
 always will be. In fact deleting any item with a higher index than current
 is safe, and always will be. Why? Because an ordinary for loop that counts
 down is free to do this and the existence of such loops in shipped code
 means that NSMutableArray can never be changed in such a way as to break
 code like that. (It's also hard to see how it could be, even theoretically).


Although an NSEnumerator is analogous to a for loop using an index
variable, that doesn't make the contract on them the same.
NSMutableArray can't be changed to break the traditional for loop that
modifies the array, but the NSEnumerator returned by NSMutableArray
can be.

You're making an assumption about the implementation of how the
enumerator moves through the list; and although I think this is a sane
assumption (any other way of enumerating through the list would be
strange), you're still breaking the contract of NSEnumerator. There is
no documented exception about the objects that have already been
enumerated over, so it shouldn't be assumed that there is one.

Phil
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Re: Design Question: Pro Cons of KVC/KVO

[Phil]

On Fri, Aug 22, 2008 at 3:59 PM, Kyle Sluder
[EMAIL PROTECTED] wrote:
 @implementation ToolBar
 {
-(id) init
{
[[[NSNotificationCenter] defaultCenter] addObserver:self
 selector:@selector(splitViewResized:) object:mySplitView];
}

-(void)dealloc
{
[[NSNotificationCenter] defaultCenter] removeObserver:self];
[super dealloc];
}
@end

I've generally only used notifications for events that can't be
handled with KVO---ie. those that aren't associated with a property
change; and I've noticed that this is generally the trend in Cocoa
frameworks as well. Why use NSNotifications when there's already
perfectly good notification mechanism?

That said, notifications also give you a lot more flexibility about
when observers will be called, and coalescence of multiple
notifications.

Phil
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Re: Question about directory for Application Caches

[Phil]

On Sat, Aug 16, 2008 at 3:33 AM, Jason Coco [EMAIL PROTECTED] wrote:
 1) ~/Library/Caches is world writable too... so as long as you're logged in,
 even if you have
your filevault armed, you're still gonna be somewhat vulnerable to cache
 attacks.
 2) The new temporary directory (returned the same by
 confstr(_CS_DARWIN_USER_TEMP_DIR,...)
and NSTemporaryDirectory(...) is also outside the sphere of filevault
 /and/ your files there
are not necessarily erased on log-out. I think it's cleaned up with the
 computer boots (although it
may be deleted on shutdown, but I don't think so)... so if any sensitive
 information were written to
the temp dir and the application relied on it being cleaned by the OS,
 that could be an issue too if
your physical drive were compromised...


Also consider the case that the user has a network home directory. If
your caches are going to be very large and frequently accessed (off
the disk), then there may be some performance penalties.

Phil
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Re: I don't understand why this is leaking...

[Phil]

On Tue, Aug 12, 2008 at 10:25 PM, Gerriet M. Denkmann
[EMAIL PROTECTED] wrote:
 Yes, I have.

 1. Simple Test:
 In IB create new window, add NSTextField with content $null (without the
 quotes) save in 10.2 or later format. Close. Open again. Look at your
 string.

[...]
 Maybe this will work on Leopard. On Tiger it does not. (No crash, nor error
 message either).


I tested this in Leopard, 2.x NIBs have this problem, but 3.X NIBs and
XIBs do not. It looks like it was a bug that's fixed in Leopard, but
preserved in some cases for backwards compatability.

Although, I wouldn't consider this bug much of a reason for not using
keyed archiving. Even though NS(Un)Archiver aren't deprecated, they
have been replaced.

Phil
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Re: Archiving NSColor as NSData

[Phil]

On Wed, Aug 13, 2008 at 9:26 AM, Rein Hillmann [EMAIL PROTECTED] wrote:
 colorAsData: 040b7374 7265616d 74797065 6481e803 84014084 8484074e 53436f6c
 6f720084 84084e53 4f626a65 63740085 84016301 8404 0101 000186

 I suspect it's archiving other ivars in the color object. If so, is this
 much data in a single color object not a little extreme?


I'm just guessing here, but it may also be archiving the NSColorSpace
associated with the NSColor, which contains information about the
colour profile so that it can accurately reproduce your NSColor on any
output device. It might be able to take short cuts with certain
colours or built-in colour spaces---again, just a guess.

Phil
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Re: How to get array of characters from NSString

[Phil Faber]

I'm a newbie myself but this might help you:

As far as I know,

[ob characterAtIndex:num]

(replacing num with the character you are after)

..will extract the single character at index num.

For example:

NSLog(@%c,[ob characterAtIndex:i]);

Outputs to the console that character in question.

Phil



On 8 Aug 2008, at 05:27, SridharRao M wrote:

Hi,I want to retrieve characters from NSString Can any one guide me  
how to

do it.
Ex:
NSString *ob=@TEST Object;

Now how to retrieve the Test Object  value into my Char Array.

Regards,
Sri.


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[Newbie] Extracting a specific character number from a string

[Phil Faber]

I'm trying to learn more about string manipulation and want to be able  
to extract a single character from a string.  I think I need to use  
subStringWithRange (exacting from and to the same character location)  
but I'm not sure and I'm also unsure how to code it.


Basically I'm after the equivalent of the old-fashioned BASIC command  
MID$ [ i.e. MID$(This is the sentence to check,4,1) to get character  
4. ]


The following code works fine except for the..

NSLog(@Character %i of %@ is %@,i,pass1,[pass1 substringWithRange: 
1,2]);


...line simply because I don't know how to code that line.  I think  
it's something to do with how to set the range that I'm getting wrong.


Can anyone please advise what than line is supposed to be to pull out  
the correct character?


Thanks.

Phil


{
NSMutableString *pass1;
int i;

pass1=@This is the sentence to check;

NSLog(@length of %@ is %i,pass1,[pass1 length]);

for (i=1;i=[pass1 length];i++)
{
// This displays characters UP to character 'i'
		NSLog(@Characters up to %i of %@ are %@,i,pass1,[pass1  
substringToIndex:i]);


// This is SUPPOSED to display character number 'i' ONLY
		NSLog(@Character %i of %@ is %@,i,pass1,[pass1  
substringWithRange:i,i]);

}



}
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Re: My own listbox

[Phil]

On Sat, Aug 2, 2008 at 8:40 PM, Vitaly Ovchinnikov
[EMAIL PROTECTED] wrote:
 The problem is that my control will work like listbox, but don't
 exactly. Actually I need to draw every row myself. And these rows will
 have some padding and many graphics stuff inside. And they will have
 adjustable height... And so on.
 I don't think that it is possible to do this with standard controls. Am I 
 wrong?


You can get an NSTableView (NSTableColumn) or NSOutlineView to use a
custom NSCell subclass for each of the rows in your list box. An
NSOutlineView is probably easiest to use for this because it only
exposes a single column.

Apple has some sample code that may help you with this:
http://developer.apple.com/samplecode/Clock_Control/
http://developer.apple.com/samplecode/SourceView/

Phil
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Re: Thread safety with background fetching

[Phil]

On Fri, Aug 1, 2008 at 4:59 AM, Ben [EMAIL PROTECTED] wrote:
 and then -[XMLFetcherParser doYourThing] repeatedly sends newly created
 objects to receiveItem: using the performSelectorOnMainThread method. Once
 the spawned thread has done this, it never uses the sent object again.


 My question is how should I protect this code from thread related problems?
 Do I just place @synchronized(){} blocks around the code in receiveItem: and
 it's counterpart in the spawned thread? Or is that just plain wrong? Or
 (likely) am I barking up totally the wrong tree?


Since it doesn't look like you're sharing any ivars or objects between
the threads, I don't think you'll need any @synchronized blocks or
locking. The only thing I can see you'll want to watch out for is the
memory management of the objects that you pass to -receiveItem:.

Phil
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Re: Authenticate Password.

[Phil]

On Tue, Jul 29, 2008 at 7:31 PM, Macarov Anatoli
[EMAIL PROTECTED] wrote:
 My program requests user's password for further work. Tha's why I'd like to 
 check password, if the user has entered it correctly. And for this I use 
 Authorization Service.


What further work? If you're wanting to peform priveleged operations,
you should let Authorization Services handle prompting the user for
their password and validating it.

Phil
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Re: Detecting platform architecture within Cocoa app?

[Phil]

On Wed, Jul 30, 2008 at 7:56 AM, Jack Skellington [EMAIL PROTECTED] wrote:
 Is there a way to determine if an App is running on Intel or PPC
 from within the App?


Gestalt() is still good for this, using the gestaltSysArchitecture selector.
http://developer.apple.com/documentation/Carbon/Reference/Gestalt_Manager/

Phil
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How to locate coding examples for specified commands [Newbie]

[Phil Faber]

Can anyone direct me to an on-line resource that includes examples of  
how to use specific Cocoa commands?  (Are things like - (NSString  
*)capitalizedString called 'commands' or should I call them something  
else?)  It's often so much easier to understand how it works by seeing  
an example.


I would like, for example, to see that


- (NSString *)capitalizedString


..is available for use and that an example of its use might be:

[textField1 setStringValue:[[textField2 stringValue]  
capitalizedString]];



or
NSString *string = @tHe uniVERSity of TEXAS;  NSString *capstring  
= [string capitalizedString];


(The above example I found at http://www.macdevcenter.com/pub/a/mac/2001/07/13/cocoa.html?page=lastx-order=datex-maxdepth=0 
 after a brief trawl)



I realise I can Google 'capitalizedString' and start going through the  
917 results to see which links contain examples and then try to  
extract the example that are Cocoa but this seems a very slow and  
cumbersome way of finding the answer - especially if I have to do it  
for every single command I'm trying to study.


For example, these from Google are (presumably!) not Cocoa:
set contents of text field inputField of window myWindow to call  
method capitalizedString of (contents of text field inputField  
of window myWindow

myString.capitalizedString()
pbString := pbString capitalizedString.

etc.
If someone can recommend a searchable resource, the first thing I'll  
be looking up is stringWithContentsOfFile:encoding:error: (I would  
have used this as an example above but can't find an example of its  
usage!)

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Re: unsigning NSNumber

[Phil]

On Wed, Jul 23, 2008 at 12:20 AM, Steven Hamilton [EMAIL PROTECTED] wrote:
 Can anyone tell me the most efficient way to unsign a floatvalue in an
 NSNumber?

 Like change a -1.47 to 1.47 ?


fabsf(3)
http://developer.apple.com/documentation/Darwin/Reference/ManPages/man3/fabs.3.html

Phil
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Re: XML serialization and deserialization

[Phil]

On Fri, Jul 25, 2008 at 6:06 PM, Oleg Krupnov [EMAIL PROTECTED] wrote:
 I have read it now and I believe the guide suggests that i archive my
 object tree in a binary byte stream, not an XML. There are no
 implementations of NSCoder that would output XML, are there?


NSKeyedArchiver can, see it's -setOutputFormat: method.

Phil
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Re: Is checking -count worth it?

[Phil]

On Thu, Jul 24, 2008 at 4:15 PM, Steve Cronin [EMAIL PROTECTED] wrote:
 I have a mutable array, M.  I want to remove an object, O, from M; O might
 not be in M.
 M which is being constantly diminished could become empty.

 Is this code worth it?
 if ([M count]0) [M removeObject:O];

 OR should I just do
 [M remove O];


I'm not quite sure what you gain in the first case? If the array is
already empty, then what extra processing do you imagine will be in
-removeObject: that you will save by checking -count first.

You may be making assumptions about how the mutable array works
internally (I'm assuming you mean an NSMutableArray), which is a bad
thing to do for any class and in the case of Apple's collection
classes, the internals can change on you:
http://ridiculousfish.com/blog/archives/2005/12/23/array/

I think that your first piece of code is far less readable than the
second, because I don't find it obvious why you're checking -count
first?

And as mentioned, measuring performance is the only way to get a true
answer as to which method is better.

Phil
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Re: Obtaining the number of characters in a string

[Phil Faber]

Thanks to all who helped me with this challenge of obtaining the  
number of characters in a string.


On 20 Jul 2008, at 13:12, Tim Isted wrote:

Try using

	[text2 setStringValue:[NSString stringWithFormat:@%i, [[Field1  
stringValue] length]]];


Using setIntValue on a text field won't set the text field's  
stringValue to be a string from that int.


That worked perfectly - thanks Tim.



On 20 Jul 2008, at 13:16, Ron Fleckner wrote:


Still struggling with documentation!


That might be because the documentation makes the reasonable  
assumption that you already know how to use C and Objective-C.


You're not recognising the difference between the data types 'int'  
and 'pointer to object'.  The text field expects a pointer to an  
NSString.  Telling it to setIntValue:someInt is just you hoping  
it'll work.


What you need to do is [text2 setStringValue:[NSString  
stringWithFormat:@%d, [text1 length]]];


You should read the documentation, paying attention to method return  
types and etcetera.  Also, bone up on basic C.  It will help a lot.


I'm trying!  Honest!  I've studied 'Learn C for Cocoa' at http://cocoadevcentral.com/articles/81.php 
, and a C programming book, as well as looking up stuff on the Web but  
it's a very slow process.  The fact that I'm dyslexic doesn't help  
(although that's not a good excuse) as I need to go over things again  
and again to 'get' them ... although once I've 'got it', it tends to  
stay put!  Getting there.  Slowly.




On 20 Jul 2008, at 14:41, Andy Lee wrote:

On Jul 20, 2008, at 8:12 AM, Tim Isted wrote:

Try using

	[text2 setStringValue:[NSString stringWithFormat:@%i,  
[[textField1 stringValue] length]]];


Using setIntValue on a text field won't set the text field's  
stringValue to be a string from that int.


I believe this is incorrect.  Try simply

[text2 setIntValue:[[text1 stringValue] length]];

The original mistake was using [text1 length], which asks the text  
*field* for its length (no such method) instead of asking the text  
field's *string*.


Interesting.  Although Tim's original suggest did work (so it wasn't  
'wrong' as such...) your simpler version also works and seems much  
neater as it simply asks for the length of the string value of text1.


Thanks everyone!

Phil
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Re: NOT or NONE in NSPredicate

[Phil]

On Fri, Jul 18, 2008 at 2:52 PM, Chad Harrison [EMAIL PROTECTED] wrote:
 I have a fairly complex NSPredicate which works correctly, but I am trying
 to compound it with with a subpredicate that contains a logical NOT. I have
 tried using many combinations of the predicate syntax, but I can't seem to
 get it working. What I am trying to do it exclude files from being picked up
 based on an NSArray of names


From the content of your predicate, it looks like you're running a
Spotlight query (NSMetadataQuery), as such, the spotlight-dev list
might be a better place for this.

The Spotlight query syntax the the NSPredicate syntax aren't quite the
same, and the behind-the-scenes conversion leaves a bit to be desired.
I remember running into a situation similar to what you're trying a
while ago, and eventually giving up and construcing my own Spotlight
query strings and using MDQuery to run them.

http://developer.apple.com/documentation/Cocoa/Conceptual/Predicates/Articles/pSpotlightComparison.html

Do you get the error if you change your predicates to:
kMDItemFSName != %@

Some else to keep in mind is that there is (or, was the last time I
checked---10.4) an upper-limit to the length of Spotlight queries. If
this list of files is going to get BIG, then you may want to
re-consider your approach, or do the filtering after you have the
results.

Phil
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Re: how to measure an attributedString or string with attributes

[Phil]

On Thu, Jul 17, 2008 at 12:18 AM, norio [EMAIL PROTECTED] wrote:
 I think QuickTime API had an api for measuring the width and the height of
 an attributed string.
 If width was passed as an argument, the height was returned. And if height,
 returned its width.

 Is there any ways to get such information?


For an NSString with attributes dictionary, AppKit has a category with
some methods that sound like what you want:
http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/Classes/NSString_AppKitAdditions/

For an NSAttributedString there are a couple of methods in its AppKit
category too:
http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/Classes/NSAttributedString_AppKitAdditions/

(Namely, -size and -boundingRectWithSize:options:)

Phil
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Newbie: How to understand Xcode's documentation

[Phil Faber]

Hi all.

As a relative newbie I'm eager to learn but my biggest stumbling block  
is understanding that the XCode's HelpDocumentation actually means;  
can someone guide me?


For example, if I want to put a substring of a larger string (eg.  
ertyu from qwertyuiop) into a second field, I search the  
documentation and come across a thing under NSString called  
getCharacters:range.  I assume this will do the job as it seems to get  
characters from a string as specified by a range;  I then look at the  
usage information which reads:


- (void)getCharacters:(unichar *)buffer range:(NSRange)aRange

My challenge is that I don't know what this means or how to convert  
this into actual code.  So I have to keep guessing which surely can't  
be the preferred way to learn!



So I try:

[newField setStringValue:[NSString getCharacters:buffer range:2,3]];

..and am told:

error: 'buffer' undeclared
warning: 'NSString' may not respond to '+getCharacters:range:'


..so I try:

[newField setStringValue:[NSString getCharacters:2,3]];

..and am told:

warning: 'NSString' may not respond to '+getCharacters:'


.. so I try:

[newField setStringValue:[NSString getCharacters:buffer range:2-3]];

..and am told:

error: 'buffer' undeclared
warning: 'NSString' may not respond to '+getCharacters:range:'


..and so on.

I'm a newbie; I'm still learning how to do simply stuff like add two  
numbers together, display 'hello world' and so on!  What I could  
really do with is the documentation giving examples.


Can anyone explain how I can 'decode' the usage information shown in  
the documentation into real code?  Not just for this example, but in  
general.


If I can't understand this, I fear I'll spend most of my time asking  
others how to achieve the most basic of tasks.


Thanks.

Phil
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Re: [NSDate +dateWithNaturalLanguageString] question

[Phil]

On Jul 13, 2008, at 12:05 PM, Keith Duncan wrote:

The problem is that NSCalendarDate uses the gregorian calendar  
exclusively


I must be out of the loop on the population of developers and/or users  
complaining about this.  If the issue is the reliance on the Gregorian  
calendar, where's the push for this coming from?  Perhaps Apple sees  
the Genealogy/Ancient History/Religion as the next killer app  
category?  Sarcasm aside, I'd really like to understand what *common*  
modern uses there are for non-Gregorian calendars that make what  
appears to be an ongoing push away from easy so worthwhile.


Thanks,
Phil
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Re: [NSDate +dateWithNaturalLanguageString] question

[Phil]

On Jul 13, 2008, at 2:50 PM, Jens Alfke wrote:



On 13 Jul '08, at 10:52 AM, Phil wrote:

I'd really like to understand what *common* modern uses there are  
for non-Gregorian calendars


Are you serious? A large fraction of the world's population uses  
other calendars. From the Wikipedia entry Calendar:




Apparently ignorant, but quite serious.

While the Gregorian calendar is widely used in Israel's business  
and day-to-day affairs, the Hebrew calendar, used by Jews worldwide  
for religious and cultural affairs, also influences civil matters  
in Israel (such as national holidays) and can be used there for  
business dealings (such as for the dating of checks).
The Persian calendar is used in Iran and Afghanistan. The Islamic  
calendar is used by most non-Persian Muslims worldwide. The  
Chinese,Hebrew, Hindu, and Julian calendars are widely used for  
religious and/or social purposes. The Ethiopian calendar or  
Ethiopic calendar is the principal calendar used in Ethiopia and  
Eritrea. In Thailand, where the Thai solar calendar is used, the  
months and days have adopted the western standard, although the  
years are still based on the traditional Buddhist calendar.
Even where there is a commonly used calendar such as the Gregorian  
calendar, alternate calendars may also be used, such as a fiscal  
calendar or the astronomical year numbering system[1].


Add that up and it's probably over 75% of the world's population  
using other calendars, at least for non-business purposes.




So I'm just be trapped in my own perspective/needs on this (i.e. when  
I read the 'business and day-to-day affairs' comment on the Hebrew  
calendar I think 'that's well over 90% of the use cases I can think of  
using the Gregorian calendar.')  OK, I'll quit complaining and quietly  
(re)implement what I need for my purposes.


Hardcoding the Gregorian calendar is a serious internationalization  
problem, just like hardcoding the Roman alphabet or left-to-right  
text layout or octagonal red stop-sign icons.


—Jens



I appreciate you taking the time to explain that this really is an  
issue for some folks as I didn't appreciate it as being as important  
as it apparently is.


Thanks,
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Re: Debugging strategy - exceptions

[Phil]

On Wed, Jul 9, 2008 at 10:13 PM, Ruotger Skupin [EMAIL PROTECTED] wrote:
 *** -[NSCFDictionary initWithObjects:forKeys:count:]: attempt to insert nil
 value at objects[0] (key: NSFont)

 So an exception got thrown for a pretty obvious reason, but where? Could be
 anywhere, even in WebKit (which we use). Is there any chance to get near the
 culprit without a stack trace (which I don't have)?


You really need to get more information. If the user can reproduce
this problem, then could you give them a version of your application
with some additional code to print out a stack trace/state information
that they can send to you?

Depending on what's going on, there's a few different ways you can go
about this. Take a read of:
http://developer.apple.com/documentation/Cocoa/Conceptual/Exceptions/

In particular, Uncaught Excpetions and Controlling a Program's
Response to Exceptions.

Phil
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Re: controlling system muting ?

[Phil]

On Tue, Jul 8, 2008 at 3:25 PM, Jason Bobier [EMAIL PROTECTED] wrote:
 Has anyone figured out how to control a machine's volume level (specifically
 muting) from code? I know that you can do it from Applescript, but running
 an applescript from code seems to be a rather clunky approach.

 This is for emergency notification, so I have to be able to crank the volume
 on the system and then restore it afterwards.


Take a read of QA1016:
http://developer.apple.com/qa/qa2006/qa1016.html

Also, TN2102, if you haven't already:
http://developer.apple.com/technotes/tn2002/tn2102.html

However, I would urge you not to mess around with the user's volume
control, even you think it is an emergency---the user may feel very
differently. Your application should play an alert sound, and trust
that the user's system output volume and alert volume are correct for
what they want to hear (although, I have no idea what your application
does; but in the general case, messing around with user settings when
they don't expect it isn't good).

-Phil
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Re: how to monitor the system status?

[Phil]

On Mar 5, 2008, at 5:13 PM, Scott.D.R wrote:


Hi everyone.
As the titled mentioned, How to monitor the system status?
Mac OS X provided a very powerful application Activity Monitor,  
which can let you inspect the system status such as CPU usage, disk  
usage, network usage and so on. But how to retrieve these  
information using APIs?




There are various API's depending on what you want to monitor.  You  
might want to take a look at a project like MenuMeters (http://www.ragingmenace.com/software/menumeters/ 
) which provides a fairly comprehensive overview of system status and  
provides source code so you can see how it was done.  I'm sure there's  
also some Apple example code that demonstrates aspects of this but I  
can't recall anything that does it all in one project like MenuMeters.


Phil
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Changing IKPictureTaker flash effect?

[Phil]

Just wondering if anyone knows of a way to either disable the 'flash'  
effect, or better yet change the color it flashes to, when the  
takeAPicture is called?


Thanks,
Phil
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