Design question: View with hell lot of drawing

[rajesh]

Hi All,

I need to display huge number of elements  in NSView (1000-2000).
These elements are generally made of high resolution image files with  
some fancy drawing around them. These elements may vary from size 300  
X 270 to 4280 X 3500.


First I made use of NSView's for elements, I abandoned the idea  
because I was supposed to connect some elements with lines, obviously  
line drawing was going behind the elements .
Secondly I tried with CALayer's and I have a problem of GPU constraint  
for the resolutions I mentioned.(I tried optimizing, by only  
displaying required layer in the View's visible part ,that too didn't  
help much)


Is there any other way of approach, or should I be making use of one  
of the ways I mentioned ?



Any help is greatly appreciated

Thanks
Rajesh

previous message to the list: subLayers - GPU - optimizing

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Re: Design question: View with hell lot of drawing

[Graham Cox]

On 10/03/2009, at 7:39 PM, rajesh wrote:

Is there any other way of approach, or should I be making use of one  
of the ways I mentioned ?



Of course - just define a custom object that contains or manages each  
piece of content and draw them in one view. This is the classic  
approach and is probably the most scalable technique of all, since it  
incurs no overhead other than what you add.


The simplest approach is just to hold all the objects in a list and  
when the view is updated, traverse the list and determine which  
objects need to be drawn. The view itself has methods to keep this to  
a minimum -needsToDrawRect: and -getRectsBeingDrawn:count: For large  
numbers of objects (1000, but YMMV) traversing the list testing for  
needs to be drawn itself becomes significant, in which case you'll  
need to consider alternative architectures such as binary search  
partitioning or R*-trees.


My own DrawKit project includes classes for dealing with this problem. http://apptree.net/drawkit.htm 
 (though right now the implementation in the current download is a  
bit buggy - I have a new version going out soon that fixes these  
issues).


--Graham






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Re: [ANN] InspectorKit (framework/IB-plugin)

[Mike Abdullah]

Hi Steven, this looks very interesting thanks. Could I ask you to  
describe how it differs from OmniInspector, other than having an IB  
Plugin?


Mike.

On 10 Mar 2009, at 05:05, Steven Degutis wrote:


Hi all!

I've just released a piece of open-source software (BSD license) as
both a framework and an Interface Builder plugin, called InspectorKit.
It's intended to give you the ability to create an inspector at design
time, which mimics the aesthetics and functionality of many found in
Leopard. You can read more detail about it at the following link,
including finding the source, a binary download, and a video demo of
the plugin in action:

http://www.degutis.org/dev/open-source/2009/03/09/introducing-inspectorkit/

Thanks, I hope you find good use from it. If you end up using it in
your project, I'd love to hear about it!

-Steven Degutis
Lead Monkey Assassin
www.ThoughtfulTree.com
www.TeachMeCocoa.com
www.Degutis.org
(also hire.Degutis.org)
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Re: persisting user credentials -- how?

[Mike Abdullah]

There's also NSURLCredentialStorage which is more specialised than the  
keychain services, but for a web service may be ideal.


On 9 Mar 2009, at 21:32, Stefan Wolfrum wrote:


Hi,

I have a little app that needs a username  password to log into  
some web service.
These user credentials should be stored permanently so that the user  
doesn't have to enter them after each start of the application again.


What's the most common way to do this? In a .plist file? But how  
does one encrypt the password? What does Apple suggest?


I googled and searched developer docs -- to no avail.

A pointer to a webpage, tutorial, document, code snippet would be  
cool!


Thanks a lot,
Stefan.

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Problem in save and open on Core Data Document Based application

[haresh vavdiya]

Hello,

  I am learning mac development from Aaron Hillegas 3rd Edition.
i have created two Example CarLot and Departments  based on Core -Data
document based application.

  When i created CarLot example that time it can save and open
data without writing single line. Then i created Departments example so it
should also save and open.

  But second example save successfully but when open, it gives
error. But in dock panel, CarLot apps is launched. i can open this apps from
dock. But i wanted to save and open Departments example.

I can't understand that i saved apps from Deparetment and it
launch CarLot example in dock. Is there in problemwhat is the
problem..i m trying from long time.

 And the message is The document “DeptTest” could not be
opened. The model configuration used to open the store is incompatible with
the one that was used to create the store.

   Please anyone help to figure out this problem.

Thanks,
Haresh.
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Re: Problem in save and open on Core Data Document Based application

[Volker in Lists]

Hi,

the message says that the data model in the file you try to open is  
different than the one you have in your app. As far as I can follow  
you, both apps use the same file type and the former is always trying  
to open the others file. Of ocurse, then it complains about the  
different model. Have you tried opening Departments file via  
Departments - File - Open ? That should work. If not, you have made  
changes to your model after saving the document.


On a side note: CoreData should not be learned by the beginner. First,  
try to understand the basics, than move slowly, very slowly up to  
CoreData, otherwise you'll be lost soon. If you're not content with  
the content you find via Apple's developer resources on Core Data,  
there is a very good book written by Markus Zarra - available as  
preliminary version from Pragmatic Programmers.


Cheers,
Volker


Am 10.03.2009 um 11:39 schrieb haresh vavdiya:


Hello,

 I am learning mac development from Aaron Hillegas 3rd  
Edition.
i have created two Example CarLot and Departments  based on Core  
-Data

document based application.

 When i created CarLot example that time it can save and  
open
data without writing single line. Then i created Departments example  
so it

should also save and open.

 But second example save successfully but when open, it  
gives
error. But in dock panel, CarLot apps is launched. i can open this  
apps from

dock. But i wanted to save and open Departments example.

   I can't understand that i saved apps from Deparetment and  
it

launch CarLot example in dock. Is there in problemwhat is the
problem..i m trying from long time.

And the message is The document “DeptTest” could not be
opened. The model configuration used to open the store is  
incompatible with

the one that was used to create the store.

  Please anyone help to figure out this problem.

Thanks,
Haresh.
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Understanding how to display a context menu

[Jacob Rhoden]

Hey guys,

I'm trying to understand the Apple docs for adding a context menu to
an NSOutlineView:

http://developer.apple.com/documentation/Cocoa/Conceptual/MenuList/Articles/DisplayContextMenu.html#//apple_ref/doc/uid/TP40004968

I am a bit stuck at how do you make it truly context sensitive, ie  I'm 
trying to

make a menu that has Add new person and Remove name, where
name is the content of the row selected?

I am guessing I need to talk back to the controller object which has the 
data?

Perhaps somehow calling back to the data source object to ask it to build
the menu (but I am not sure how to do that or if I should do that).

This allows me to at least show the row number in the menu:

@implementation NSContextOutlineView
- (NSMenu *)defaultMenu {
   if([self selectedRow]  0) return nil;
   NSMenu *theMenu = [[[NSMenu alloc] initWithTitle:@Website context 
menu] autorelease];
   [theMenu insertItemWithTitle:@Add new person 
action:@selector(addSite:) keyEquivalent:@ atIndex:0];
   NSString* deleteItem = [NSString stringWithFormat: @Remove '%i', 
[self selectedRow]];
   [theMenu insertItemWithTitle: deleteItem 
action:@selector(removeSite:) keyEquivalent:@ atIndex:1];

   return theMenu;
}
- (NSMenu *)menuForEvent:(NSEvent *)theEvent {
   return [self defaultMenu];   
}

@end

Any help much appreciated!

Thanks,
Jacob

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Re: [ANN] InspectorKit (framework/IB-plugin)

[Steven Degutis]

Sure. Basically, InspectorKit is designed to be a little more simple
in usage and aesthetics. For example, it does not provide a
specialized titlebar, and every pane is collapsible. It also uses Core
Animation to animate its panels, and is thus only Leopard+ compatible.
And as you mentioned, this framework comes with an IB plugin, making
it much easier to design your inspector panels inside IB and test out
in the Cocoa Simulator.

- Steven

On Tue, Mar 10, 2009 at 5:18 AM, Mike Abdullah
cocoa...@mikeabdullah.net wrote:
 Hi Steven, this looks very interesting thanks. Could I ask you to describe
 how it differs from OmniInspector, other than having an IB Plugin?

 Mike.

 On 10 Mar 2009, at 05:05, Steven Degutis wrote:

 Hi all!

 I've just released a piece of open-source software (BSD license) as
 both a framework and an Interface Builder plugin, called InspectorKit.
 It's intended to give you the ability to create an inspector at design
 time, which mimics the aesthetics and functionality of many found in
 Leopard. You can read more detail about it at the following link,
 including finding the source, a binary download, and a video demo of
 the plugin in action:


 http://www.degutis.org/dev/open-source/2009/03/09/introducing-inspectorkit/

 Thanks, I hope you find good use from it. If you end up using it in
 your project, I'd love to hear about it!

 -Steven Degutis
 Lead Monkey Assassin
 www.ThoughtfulTree.com
 www.TeachMeCocoa.com
 www.Degutis.org
 (also hire.Degutis.org)
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-- 
~Steven Degutis
President, Thoughtful Tree Software, Inc.
http://www.ThoughtfulTree.com/
http://www.TeachMeCocoa.com/
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launching IPhone App Via terminal in IPhone Simulator

[Anshul jain]

Hi,
   I was writing an automation tool from which i need to build  
and launch IPhone App.I am able to build it. but when i try to launch  
the application it crashes.  Can any body help me.



Regards,
Anshul jain






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Re: User In-Activity hook? And a request

[Scott Ribe]

For anybody who cares, the following predates CGSecondsSinceLastInputEvent,
and uses only public APIs. It's probably just personal preference as to
which is less vile ;-)

- (float) getSystemIdleSeconds
{
static mach_port_t masterPort = 0;
static io_iterator_t iter;
static io_registry_entry_t curio;

if( masterPort == 0 )
{
if( IOMasterPort( MACH_PORT_NULL, masterPort ) == KERN_SUCCESS 
IOServiceGetMatchingServices( masterPort, IOServiceMatching(
IOHIDSystem ), iter ) == KERN_SUCCESS )
{
curio = IOIteratorNext( iter );
IOObjectRelease( iter );
}
}

CFTypeRef obj = 0;
if( curio )
obj = IORegistryEntryCreateCFProperty( curio, CFSTR( HIDIdleTime
), kCFAllocatorDefault, 0 );

float val = 0;
if( obj ) 
{
uint64_t nano = 0;
CFTypeID type = CFGetTypeID( obj );

if( type == CFDataGetTypeID() )
CFDataGetBytes( (CFDataRef) obj, CFRangeMake( 0, sizeof( nano
)), (UInt8*) nano );
else if( type == CFNumberGetTypeID() )
CFNumberGetValue( (CFNumberRef) obj, kCFNumberSInt64Type, nano
);

CFRelease( obj );

val = nano / 10.0;
}

return val;
}


-- 
Scott Ribe
scott_r...@killerbytes.com
http://www.killerbytes.com/
(303) 722-0567 voice


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KVO Bindings: Proxy object change notifications

[Dave Keck]

Hey list,

I'm having some issues with KVO and updating UI elements via bindings;
I'd greatly appreciate some clarification on the KVO-compliant way to
do what I'm attempting:

I have a preferences controller object (let's call it PrefCtrl) that's
modeled after NSUserDefaultsController (for various reasons, though,
it's a custom implementation.) As does NSUDC, it has a 'values'
property, which mediates access to the preferences. The bindings in
the UI use this 'values' proxy object to access the preferences. The
role of the proxy object is simple: it forwards KVC methods
(-valueForUndefinedKey: and setValue:forUndefinedKey:) to PrefCtrl,
which either supplies or sets the appropriate value.

Preferences can change at anytime and potentially from other
processes. (I've got the correct locking mechanisms in place, and
such.) When the preferences change from 'under the feet' of the app in
question, I expect the UI elements of the app to update accordingly
(via bindings). In order to announce that the UI elements need
updating, I wrap the preferences-updating code with
willChange/didChangeValueForKey:

- (void)preferencesOnDiskDidChangeNotification: (NSNotification *)notification
{
// This code is part of PrefCtrl
[self willChangeValueForKey: @values];
... read the prefs from disk, and update our in-memory prefs
dictionary to reflect the new prefs ...
[self didChangeValueForKey: @values];
}

Now consider when I have UI elements bound to the PrefCtrl - for
example, a button's enabled property is bound to PrefCtrl's
values.someFeature (when a value exists for the 'values.someFeature'
key path, the button's enabled, otherwise disabled.) This all works
fine - when preferences change, the enabled state of the button
reflects the current value of 'values.someFeature'. The problem arises
when I have 3+ elements in the binding key path. For example, if the
button's enabled property is bound to PrefCtrl's
values.someFeature.isEnabled. In this case, when the value of
'values.someFeature.isEnabled' changes (let's assume due to another
process re-writing the preferences) is when hell breaks loose and I
get this delightful message:

Cannot remove an observer NSKeyValueObservance 0x137d50 for the key
path someFeature.isEnabled from PrefCtrl_Proxy 0x135bd0, most
likely because the value for the key someFeature has changed without
an appropriate KVO notification being sent. Check the KVO-compliance
of the PrefCtrl_Proxy class.

(Note that PrefCtrl_Proxy is the class name of my 'values' proxy.)

My question: Of course, this error is correct - the value for the
'someFeature' key DID change. But why wasn't sending
willChange/didChangeValueForKey: @values enough to notify the KVO
system that values.someFeature was also going to change? It seems
implied that when announcing that the root segment of the key path
('values') is changing, all children keys will also be changing. But
based on this console output, I suppose not. When the preferences
change, do I really need to send willChange/didChange for every key
that's present in 'values'? (Which makes everything work, by the way,
but definitely isn't as easy as simple announcing that PrefCtrl's
'values' will change. I should also mention that I've found
keyPathsForValuesAffectingValueForKey:, but it's just as clumsy as
sending willChange/didChange for every key in 'values'.)

What's even more confusing is that everything works fine when I
exclude the 'isEnabled' suffix of the key path. That is, sending
willChange/didChangeValueForKey: @values is sufficient when the
button's enabled property is bound to values.someFeature; my UI
updates accordingly and I don't receive any output in the console.

I've created an example project that exhibits my problem, it's
available here: http://www.docdave.com/kvo_project.zip

I've been reading through the KVO documentation but I can't seem to
find anything relevant to this issue (I'm not sure what I would even
call this problem). Perhaps I'm blind - if you would be so kind to
point me in the right direction :)

Thanks a lot for any help!

David
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Control in NSWindow top-right

[Mozketo]

Hi All,

Could anyone point me towards documentation/blog on how to add a  
control to the top-right of a Window, or tell me if it's even  
possible? I'd like to add an NSButton up there, perhaps a Register  
now button for example.


To further clarify what I'm talking about here a link 
http://skitch.com/mozketo/b8tfw/controlonwindow

Many thanks, Ben.
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Getting Distant Object In C++

[rajesh swarnkar]

Hi All,

  I have two application in which I want to implement IPC using cocoa
distributed object . Then I have established NSConnection between two
process and I am able to get proxy for the object in the remote process
in the client application . Using this proxy I want to get access to various
other object that exist in the remote process . These object are instance of
both c++ class as well as objective c class.

  In the client process I have a base class pointer which I want to
point to the implementing class in the remote process. At the same time in
the client process I have objective c protocol in which I want to
recieve implementing objective c class's object that implements our
protocol.

  While the objective C version works peerfectly , the c++ version does
not.

Can you please guide me to a possible way by which I get the c++
implementation working . Please see my code below.


Thanks

//
//  remote application
//

  /TestRemote
.h*/

class CRemoteBase;

@protocol RemoteProtocol
 - (CRemoteBase*) GetRemoteObject;
@end

@interface CRemote : NSObject RemoteProtocol
{
}
- (void) RegistreRemote;
@end

class CRemoteBase
{
   public:
 virtual void ShowMessage() = 0;
};

class CRemoteDerived : public CRemoteBase
{
  public:
CRemoteDerived ();
~CRemoteDerived();
void ShowMessage();
};

  /
TestRemote.cpp*/
@implementing CRemote

- init
{
return self;
}

- (void) RegisterRemote
{
[[NSConnection defaultConnection] setRootObject : self];
[[NSConnection defaultConnection] registerName :@TestRemote];
}

- (void) dealloc
{
   [super dealloc];
}

- (CRemoteBase*) GetRemoteObject
{
  return new CRemoteDerived();
}

@end //end

CRemoteDerived :: CRemoteDerived () {}

CRemoteDerived :: ~CRemoteDerived () {}

void CRemoteDerived :: ShowMessage()
{
   printf(This is remote object testing);
}


//
//  reciever application
//

  /TestReciever.h*/

@interface CTestReciever : NSObject
{
  id remoteProxy;
}
- (CRemoteBase*) GetDistantObject : (NSString*) registerName;
@end

 /TestReciever.cpp*/

@implementing CTestReciever

- init
{
 if (self = [super init])
{
  CRemoteBase ptrRemote = NULL;
  ptrRemote = (CRemoteBase*)[self GetDistantObject : @TestRemote];
  ptrRemote-ShowMessage();
  delete(ptrRemote);
}
return self;
}

- (void) dealloc
{
[super dealloc];
}

- (CRemoteBase*) GetDistantObject : (NSString*) registerName
{
remoteProxy = [[NSConnection rootProxyFor ConnectionWithRegisteredName
:registerName host : nil]retain];
[remoteProxy setProtocolForProxy : @protocol(RemoteProtocol)];
if(remoteProxy  [remoteProxy conformsToProtocol :
@protocol(RemoteProtocol)])
{
return [remoteProxy GetRemoteObject ];
}
else
return NULL;
}

@end
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Remote Invocation

[rajesh swarnkar]

Hi All,
   I have two application in cocoa . My aim is to communicate with a
protocol between both the application using IPC mechanism (through
NSConnection) but I am unable to achieve my goal.

I want to use id  MyProtocol  protocol as inout parameter for two way
communication.
   Please see my code below and guide me what I am missing.

//***Vendor
Process**
//   Root.h

@protocol MyProtocol

- (long) getNumber ;

@end


@protocol RootProtocol

- (HRESULT) getData : (id  MyProtocol ) pMyProtocol;

@end


@interface CRoot : NSObject  RootProtocol

{}

@end


@protocol RemoteObjProtocol

- (id) GetDistObject;

@end

@interface CRootService : NSObject  RemoteObjProtocol 

{}

@end


@interface OutClass : NSObject  MyProtocol 

{}

@end


//   Root.m


@implementation OutClass

- (id) init {return self;}


- (void) dealloc {[super dealloc];}


- (long) getNumber {return 10;}


@end


@implementation CRoot

- (id) init{return self;}


- (void) dealloc{[super dealloc];}


- (HRESULT) getData : (id  MyProtocol ) pMyProtocol

{

pMyProtocol = [[[CRootService alloc] init] autorelease];

return S_OK;

}

@end


@implementation CRootService


- (id) init

{

[[NSConnection defaultConnection] setRootObject: self];

[[NSConnection defaultConnection] registerName: @RootService];

return self;

}


- (void) dealloc{[super dealloc];}


- (id) GetDistObject

{

return [[[CRoot alloc] init] autorelease];

}


@end
//Reciever Process**

///  Test.h

@interface CTest : NSObject {}

+ (id) ReturnDistObj : (NSString*)registeredName;

@end


// Test.m


id remoteProxy;


@implementation CTest

- (id) init{return self;}


- (void) dealloc{[super dealloc];}


+ (id) ReturnDistObj : (NSString*)registeredName

{

remoteProxy = [[NSConnection rootProxyForConnectionWithRegisteredName:
registeredName host: nil] retain];

 [remoteProxy setProtocolForProxy:@protocol(RemoteObjProtocol)];

 if (remoteProxy  [remoteProxy conformsToProtocol: @protocol(
RemoteObjProtocol)])

{

return [remoteProxy  GetDistObject] ;

}

else

return NULL;

}


@end

int main()
{

id  RootProtocol  pRootProtocol = [CTest ReturnDistObj:
@Rootservice];

id  MyProtocol  pMyProtocol = nil;

[pRootProtocol getData: pMyProtocol ];

return 1;
}
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State of performing tasks with elevated privileges

[Sidney San Martín]

I'm fairly new to Cocoa (new to real desktop programing in general, to
be honest) and am building an app that's going to want occasional
system-level privileges (10.4+). Actually, here's what it needs:

1. To be able to set its preferences system-wide
2. To add itself as a login item for all users
3. To uninstall itself entirely (manually and requiring admin
authorization, or silently self-destructing)
4. To do any of the above without making assumptions about the
logged-in user (admin, regular, network).

After poking around a lot in the documentation and on list archives,
it looked like my best bet would be to create a helper tool to do
anything privileged. Things started to get complicated.

It looks now like I have four options:

I can make a helper tool that I call with
AuthorizationExecuteWithPrivileges. I already have this working, but
it's vulnerable to attack (if the helper binary is replaced) and
apparently has poorly-documented caveats (needing to reap the process
when it's done executing, for one, which is something else I've never
done).

I can make a helper tool that's package-installed as suid root. I
shouldn't have to worry too much about it other than checking with the
parent before doing anything dangerous. Anyone with rights to modify
it already has control over the system. However, this kind of tool
will only run from a permissions-enabled drive and can't be
drag-copied or drag-installed. Not elegant.

The third option looks to be MoreSecurity. Takes care of its own
copying and permissions. But it's very, very old code and I haven't
even gotten the example to compile yet on my Leopard machine.
Something about the many hundreds of lines of C used to solve the
problem makes me uneasy (one of the reasons I'm writing this).

The final option would be BetterAuthorizationSample. It's new.
Wonderful. But it installs a launchd plist, and looking around at my
own systems I see no evidence that any of the applications I use on an
everyday basis work this way. I only find them for apps that really
are running as daemons, and not in the format BAS uses. Also, this
text is in the readme: if your application needs elevated privileges
for a one-off task (like installing or uninstalling), you should
consider using AuthorizationExecuteWithPrivileges directly. What I'm
doing won't be one-off, but it won't be common either. I also hear the
occasional warning that launchd has serious issues in Tiger. How true
is this?


I'm coming to cocoa-dev looking for some guidance on the real-world,
current way of doing this. What have I missed? What's obsolete, what's
advised against, and what are you all using in production?

Any guidance would be deeply appreciated.
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Re: Design question: View with hell lot of drawing

[Steve Christensen]

On Mar 10, 2009, at 1:39 AM, rajesh wrote:


I need to display huge number of elements  in NSView (1000-2000).
These elements are generally made of high resolution image files  
with some fancy drawing around them. These elements may vary from  
size 300 X 270 to 4280 X 3500.


First I made use of NSView's for elements, I abandoned the idea  
because I was supposed to connect some elements with lines,  
obviously line drawing was going behind the elements .
Secondly I tried with CALayer's and I have a problem of GPU  
constraint for the resolutions I mentioned.(I tried optimizing, by  
only displaying required layer in the View's visible part ,that too  
didn't help much)


Is there any other way of approach, or should I be making use of  
one of the ways I mentioned ?


In addition to Graham's comments in a previous reply, I'd also  
suggest that, depending on what your view does, to generate a smaller  
thumbnail to represent the full-sized image. This both reduces your  
memory footprint as well as improving drawing speed. If the thumbnail  
size is dependent upon the view size, you could either invalidate  
your thumbnail cache when the view size changes or choose a maximum  
thumbnail size that you just scale appropriately.


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Garbage collected and non-garbage collected

[Robert Mullen]

I have an app built using garbage collection. I am begin asked to  
introduce a framework that is non garbage collected but the compiler  
will not allow this. I have set GC supported on the framework and  
recompiled which works but the framework causes cryptic errors once  
compiled in this manner. I am not really experienced in this manner  
and have read the docs which make me believe that the code should be  
fine but it is not. Am I misreading the docs? Is there a way to get GC  
and non GC code to live together happily? 
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Re: Getting Distant Object In C++

[Michael Ash]

On Tue, Mar 10, 2009 at 7:44 AM, rajesh swarnkar
amicableraj...@gmail.com wrote:
      While the objective C version works peerfectly , the c++ version does
 not.

 Can you please guide me to a possible way by which I get the c++
 implementation working . Please see my code below.

No, we really can't guide you. Doesn't work is a meaningless thing
to say. Of course it doesn't work, if it worked you wouldn't be here.

Explain more about how it fails, then perhaps somebody will be able to assist.

Mike
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Re: Garbage collected and non-garbage collected

[Sean McBride]

On 3/10/09 10:23 AM, Robert Mullen said:

I have an app built using garbage collection. I am begin asked to
introduce a framework that is non garbage collected but the compiler
will not allow this. I have set GC supported on the framework and
recompiled which works but the framework causes cryptic errors once
compiled in this manner. I am not really experienced in this manner
and have read the docs which make me believe that the code should be
fine but it is not. Am I misreading the docs? Is there a way to get GC
and non GC code to live together happily?

You'll have to do a code review and testing of the framework's code to
make sure it supports both GC and RR.

--

Sean McBride, B. Eng s...@rogue-research.com
Rogue Researchwww.rogue-research.com
Mac Software Developer  Montréal, Québec, Canada


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Re: Getting Distant Object In C++

[Kyle Sluder]

A word of advice when posting code like this: use pastebin.
http://pastebin.com  It makes the code a lot easier to read.

As it stands, your .cpp file is weird... it should be .mm to invoke
the Objective-C++ compiler, and @implementing isn't an ObjC keyword.

--Kyle Sluder
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Re: Garbage collected and non-garbage collected

[Michael Ash]

On Tue, Mar 10, 2009 at 1:23 PM, Robert Mullen robe...@autowc.com wrote:
 I have an app built using garbage collection. I am begin asked to introduce
 a framework that is non garbage collected but the compiler will not allow
 this. I have set GC supported on the framework and recompiled which works
 but the framework causes cryptic errors once compiled in this manner. I am
 not really experienced in this manner and have read the docs which make me
 believe that the code should be fine but it is not. Am I misreading the
 docs? Is there a way to get GC and non GC code to live together
 happily?

GC is all-or-nothing. In any given process, either it is garbage
collected or it is not. If it uses GC, all code which loads into the
process must be GC-capable. If it does not use GC, all code must be
retain/release capable.

The way Cocoa's GC works, you can't just flip the switch on some old
code and have it work. If you want to use this framework, you'll have
to go through and actually fix it up to be properly GC capable.

Apple's Garbage Collection Programming Guide has a small section on
old-style patterns which don't translate across to a GC environment
which may be helpful to you:

http://developer.apple.com/documentation/Cocoa/Conceptual/GarbageCollection/Articles/gcInapplicablePatterns.html#//apple_ref/doc/uid/TP40006762

Mike
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Re: Control in NSWindow top-right

[Kyle Sluder]

Use -[NSWindow standardWindowButton:] to get a pointer to one of the
buttons in the titlebar; doesn't matter which one, but you may want to
use NSWindowToolbarButton if you're putting it in the upper-right.
Then use -[NSView superview] to get at the view that encloses the
titlebar, and add your view as a subview.

--Kyle Sluder
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Re: State of performing tasks with elevated privileges

[Nick Zitzmann]

On Mar 10, 2009, at 10:39 AM, Sidney San Martín wrote:


I can make a helper tool that I call with
AuthorizationExecuteWithPrivileges. I already have this working, but
it's vulnerable to attack (if the helper binary is replaced)


Yes, but the chances of that happening are very, very low unless the  
same user who installed the application also installed some malware  
that intentionally targeted your app. If that's a concern to you, then  
you could check a checksum or some other signature before invoking AEWP 
(). But keep in mind that (1) malware of any kind on Mac OS X is very  
rare to nonexistent, and (2) you cannot stop a very determined  
attacker; you can make it more difficult to discourage the less  
determined, but not impossible.



and
apparently has poorly-documented caveats (needing to reap the process
when it's done executing, for one, which is something else I've never
done).



Well, you don't _need_ to reap the zombies if you don't want to. It'll  
just look strange in Activity Monitor, and will waste a little RAM  
until the parent task exits.


Nick Zitzmann
http://www.chronosnet.com/



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Re: Getting Distant Object In C++

[Andrew Farmer]

On 10 Mar 09, at 04:44, rajesh swarnkar wrote:
 I have two application in which I want to implement IPC using  
cocoa

distributed object . Then I have established NSConnection between two
process and I am able to get proxy for the object in the remote  
process
in the client application . Using this proxy I want to get access to  
various
other object that exist in the remote process . These object are  
instance of

both c++ class as well as objective c class.

[...]

Well, yes, of course it doesn't work. Distributed Objects only works  
for ObjC; it won't work on C++ objects, no matter how much typecasting  
you do. ObjC++ doesn't work that way.

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Re: Garbage collected and non-garbage collected

[I. Savant]

On Tue, Mar 10, 2009 at 1:32 PM, Sean McBride s...@rogue-research.com wrote:

 You'll have to do a code review and testing of the framework's code to
 make sure it supports both GC and RR.

  Unfortunately this is true. Not just for frameworks, but any
plug-ins those frameworks might load.

  A new, small internal project started awhile back seemed like the
perfect opportunity to try out GC in a production app. This app used
QTKit, but users needed the Flip4Mac plug-in to work with WMA files.
At the time (I have no idea about now), any time QuickTime tried to
load the Flip4Mac plug-in, it would die horribly. I reverted to good
old-fashioned memory management for two reasons:

1 - I couldn't wait for the plug-in to be updated to support this
(assuming it ever would be).
2 - I could see no way of nicely handling the situation even if the
plug-in was updated, since some users would inevitably be using an
older version ... because they may have forgotten (or not even known)
the plug-in was installed, or what it even was by name.

  I have to admit, it was a *totally* unexpected problem that I was
lucky to have noticed (because I had the plug-in installed for
personal use) before investing much time and having to retro-fit
everything with memory management.

  If you're looking for more details (the specific failure, behavior,
whether it could have been caught and handled properly), I have none.
It was right around Leopard's release and was a quick-and-dirty
project, so I didn't bother studying the problem beyond, Oh, that
won't work. Back to the tried-and-true. Sorry.

--
I.S.
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NSSlider changed notification

[David Alter]

Hi All,
I'm sure this is something basic that I'm just missing. For some reason I
can not find how to get a notification when my slider changes value. I want
to be able to subscribe to receive a notification if the slider value
changes. Is there a delegate method for this? What is the best way to get
this?

I guess one option would be to use KVO, but I suspect there is
a simpler solution.

thanks for the help
-dave
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Re: Garbage collected and non-garbage collected

[Bill Bumgarner]

On Mar 10, 2009, at 10:46 AM, I. Savant wrote:

 Unfortunately this is true. Not just for frameworks, but any
plug-ins those frameworks might load.

 A new, small internal project started awhile back seemed like the
perfect opportunity to try out GC in a production app. This app used
QTKit, but users needed the Flip4Mac plug-in to work with WMA files.
At the time (I have no idea about now), any time QuickTime tried to
load the Flip4Mac plug-in, it would die horribly. I reverted to good
old-fashioned memory management for two reasons:


Generally, a GC incompatibility shouldn't die a horrible death.  If a  
plug-in load is attempted and the plug-in's GC configuration  
mismatches the application, dyld will refuse to load it.   The one  
'hole' is a pure-C plug-in that makes calls that trigger GCisms in  
contexts where they shouldn't be;  this is relatively rare, but QT  
plug-ins is a known source of such issues.


The code needs to be compiled with GC enabled so that the correct  
write barrier and layout information is emitted.  And, of course, it  
needs to be tested.


If you run across plug-ins that cause issues, you can do two things to  
help address the issue:


(1) file a bug at http://bugreport.apple.com/ to make ADC/DTS aware of  
the incompatibility


(2) give some feedback to the folks that make the plug-in that  
indicates that you need GC support


b.bum
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Re: NSSlider changed notification

[Kyle Sluder]

NSSlider fires its action when the value changes.  If its continuous
property is YES, this happens while the user drags the widget.
Otherwise it only sends its action when the mouse is released.

--Kyle Sluder
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Re: NSSlider changed notification

[Randall Meadows]

On Mar 10, 2009, at 12:03 PM, David Alter wrote:


Hi All,
I'm sure this is something basic that I'm just missing. For some  
reason I
can not find how to get a notification when my slider changes value.  
I want

to be able to subscribe to receive a notification if the slider value
changes. Is there a delegate method for this? What is the best way  
to get

this?


Is the slider set to be continuous (either check the box in IB or  
call -setContinuous:YES on it)?  If so, then it's action method will  
be called every time the value changes.  If not, then the action  
method will be called when the user has finished dragging the slider.

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Re: Garbage collected and non-garbage collected

[Robert Mullen]

Going non-GC is not an option for our main project so my only hope  
with said framework is to correct it myself. I have been able to do a  
little debugging but I dead end with a BAD_ACCESS which I guess is to  
be expected with this sort of thing. I will have to see if I can  
narrow the problem but I may be out of my depth as a fairly new OC/ 
Cocoa guy.


Thanks for the tips all.

On Mar 10, 2009, at 10:46 AM, I. Savant wrote:

On Tue, Mar 10, 2009 at 1:32 PM, Sean McBride s...@rogue- 
research.com wrote:


You'll have to do a code review and testing of the framework's code  
to

make sure it supports both GC and RR.


 Unfortunately this is true. Not just for frameworks, but any
plug-ins those frameworks might load.

 A new, small internal project started awhile back seemed like the
perfect opportunity to try out GC in a production app. This app used
QTKit, but users needed the Flip4Mac plug-in to work with WMA files.
At the time (I have no idea about now), any time QuickTime tried to
load the Flip4Mac plug-in, it would die horribly. I reverted to good
old-fashioned memory management for two reasons:

1 - I couldn't wait for the plug-in to be updated to support this
(assuming it ever would be).
2 - I could see no way of nicely handling the situation even if the
plug-in was updated, since some users would inevitably be using an
older version ... because they may have forgotten (or not even known)
the plug-in was installed, or what it even was by name.

 I have to admit, it was a *totally* unexpected problem that I was
lucky to have noticed (because I had the plug-in installed for
personal use) before investing much time and having to retro-fit
everything with memory management.

 If you're looking for more details (the specific failure, behavior,
whether it could have been caught and handled properly), I have none.
It was right around Leopard's release and was a quick-and-dirty
project, so I didn't bother studying the problem beyond, Oh, that
won't work. Back to the tried-and-true. Sorry.

--
I.S.



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NSMutableDictionary drives me mad.

[Тимофей Даньшин]

Hello.
I am writing a method for searching for the longest common substring.  
The idea is to store the pieces of that LCS in an NSMutableDictionary  
with TMIntWrappers as keys and NSMutableStrings as values.
Now, TMIntWrapper is the class i created for wrapping ints into  
objects. It stores an int, gives access to it via the .value property,  
adopts the NSCopying protocol and implements the -(BOOL) isEqual: (id)  
object method.
The logic is, if the dictionary already has a value for a given key,  
the new value should be appended to the current value, if the  
dictionary doesn't have any value for that key yet, a new  
NSMutableString is created and stored in that dictionary.


But I just cannot understand why, within one and the same cycle, some  
values get appended, and some are stored with seemingly different  
TMIntWrapper keys with the same value (even though the isEqual method  
returns YES if the int values of two int wrappers are equal).


Here is the method in question:

- (void) addToAddedCharAtPosition:(int)charPosition withKey: 
(TMIntWrapper *)key {
	NSLog  
(@___ 
);

NSLog (@The key is: %@, key);
	NSLog (@ The object for the key is: %@, [addedToDbString  
objectForKey:key]);

if ([addedToDbString objectForKey:key] == nil) {
		NSMutableString *ms = [[NSMutableString alloc]initWithString:[inText  
substringWithRange:NSMakeRange(charPosition-1, 1)]];

NSLog(@  The ms string is: %@, ms);
[addedToDbString setObject:[ms mutableCopy] forKey:[key copy]];
		NSLog(@ We are trying to add this: %@, [inText  
substringWithRange:NSMakeRange(charPosition-1, 1)]);
		NSLog (@AND NOW: The object for the key is: %@, [addedToDbString  
objectForKey:key]);

return;
}
	NSLog (@We are trying to add this: %@,[inText  
substringWithRange:NSMakeRange(charPosition-1, 1)]);
	[[addedToDbString objectForKey:key] appendString:[inText  
substringWithRange:NSMakeRange(charPosition-1, 1)]];

}

And here is what those NSLogs generate.



2009-03-10 21:09:48.871 SQL doc[13532:10b]  
___
2009-03-10 21:09:48.872 SQL doc[13532:10b] The  
key is: 0
2009-03-10 21:09:48.872 SQL doc[13532:10b]  The object for the  
key is: (null)
2009-03-10 21:09:48.873 SQL doc[13532:10b]   The ms  
string is: x
2009-03-10 21:09:48.874 SQL doc[13532:10b]  We are trying to  
add this: x
2009-03-10 21:09:48.875 SQL doc[13532:10b] AND NOW: The object for the  
key is: (null)
2009-03-10 21:09:48.875 SQL doc[13532:10b]  
___
2009-03-10 21:09:48.877 SQL doc[13532:10b] The  
key is: 0
2009-03-10 21:09:48.877 SQL doc[13532:10b]  The object for the  
key is: (null)
2009-03-10 21:09:48.879 SQL doc[13532:10b]   The ms  
string is: e
2009-03-10 21:09:48.880 SQL doc[13532:10b]  We are trying to  
add this: e
2009-03-10 21:09:48.880 SQL doc[13532:10b] AND NOW: The object for the  
key is: e
2009-03-10 21:09:48.880 SQL doc[13532:10b]  
___


Please help me...







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Re: Garbage collected and non-garbage collected

[I. Savant]

On Tue, Mar 10, 2009 at 2:16 PM, Robert Mullen robe...@autowc.com wrote:

 Going non-GC is not an option for our main project

  If you don't mind my asking ... why? Too much work invested?

--
I.S.
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Re: NSMutableDictionary drives me mad.

[Alexander Heinz]

Have you tried using NSNumber instead of your custom integer wrapper?  
I doubt this is the problem, but see what happens if you do.


HTH,
Alex

On Mar 10, 2009, at 2:33 PM, Тимофей Даньшин wrote:


Hello.
I am writing a method for searching for the longest common  
substring. The idea is to store the pieces of that LCS in an  
NSMutableDictionary with TMIntWrappers as keys and NSMutableStrings  
as values.
Now, TMIntWrapper is the class i created for wrapping ints into  
objects. It stores an int, gives access to it via the .value  
property, adopts the NSCopying protocol and implements the -(BOOL)  
isEqual: (id) object method.
The logic is, if the dictionary already has a value for a given key,  
the new value should be appended to the current value, if the  
dictionary doesn't have any value for that key yet, a new  
NSMutableString is created and stored in that dictionary.


But I just cannot understand why, within one and the same cycle,  
some values get appended, and some are stored with seemingly  
different TMIntWrapper keys with the same value (even though the  
isEqual method returns YES if the int values of two int wrappers are  
equal).


Here is the method in question:

- (void) addToAddedCharAtPosition:(int)charPosition withKey: 
(TMIntWrapper *)key {
	NSLog  
(@___ 
);

NSLog (@The key is: %@, key);
	NSLog (@ The object for the key is: %@, [addedToDbString  
objectForKey:key]);

if ([addedToDbString objectForKey:key] == nil) {
		NSMutableString *ms = [[NSMutableString alloc]initWithString: 
[inText substringWithRange:NSMakeRange(charPosition-1, 1)]];

NSLog(@  The ms string is: %@, ms);
[addedToDbString setObject:[ms mutableCopy] forKey:[key copy]];
		NSLog(@ We are trying to add this: %@, [inText  
substringWithRange:NSMakeRange(charPosition-1, 1)]);
		NSLog (@AND NOW: The object for the key is: %@, [addedToDbString  
objectForKey:key]);

return;
}
	NSLog (@We are trying to add this: %@,[inText  
substringWithRange:NSMakeRange(charPosition-1, 1)]);
	[[addedToDbString objectForKey:key] appendString:[inText  
substringWithRange:NSMakeRange(charPosition-1, 1)]];

}

And here is what those NSLogs generate.



2009-03-10 21:09:48.871 SQL doc[13532:10b]  
___
2009-03-10 21:09:48.872 SQL doc[13532:10b]  
The key is: 0
2009-03-10 21:09:48.872 SQL doc[13532:10b]  The object for  
the key is: (null)
2009-03-10 21:09:48.873 SQL doc[13532:10b]   The ms  
string is: x
2009-03-10 21:09:48.874 SQL doc[13532:10b]  We are trying to  
add this: x
2009-03-10 21:09:48.875 SQL doc[13532:10b] AND NOW: The object for  
the key is: (null)
2009-03-10 21:09:48.875 SQL doc[13532:10b]  
___
2009-03-10 21:09:48.877 SQL doc[13532:10b]  
The key is: 0
2009-03-10 21:09:48.877 SQL doc[13532:10b]  The object for  
the key is: (null)
2009-03-10 21:09:48.879 SQL doc[13532:10b]   The ms  
string is: e
2009-03-10 21:09:48.880 SQL doc[13532:10b]  We are trying to  
add this: e
2009-03-10 21:09:48.880 SQL doc[13532:10b] AND NOW: The object for  
the key is: e
2009-03-10 21:09:48.880 SQL doc[13532:10b]  
___


Please help me...

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Re: NSMutableDictionary drives me mad.

[Eric Gorr]

I'm not sure what your problem is, but I wanted to point out that it  
appears you could use NSNumber instead of TMIntWrappers to wrap an int  
value inside of an NSObject which can be used as a key. Perhaps there  
is a bug in TMIntWrappers that is preventing it from being used as a  
key...



Is there a reason why you need TMIntWrappers and cannot use NSNumber?


On Mar 10, 2009, at 2:33 PM, Тимофей Даньшин wrote:


Hello.
I am writing a method for searching for the longest common  
substring. The idea is to store the pieces of that LCS in an  
NSMutableDictionary with TMIntWrappers as keys and NSMutableStrings  
as values.
Now, TMIntWrapper is the class i created for wrapping ints into  
objects. It stores an int, gives access to it via the .value  
property, adopts the NSCopying protocol and implements the -(BOOL)  
isEqual: (id) object method.
The logic is, if the dictionary already has a value for a given key,  
the new value should be appended to the current value, if the  
dictionary doesn't have any value for that key yet, a new  
NSMutableString is created and stored in that dictionary.


But I just cannot understand why, within one and the same cycle,  
some values get appended, and some are stored with seemingly  
different TMIntWrapper keys with the same value (even though the  
isEqual method returns YES if the int values of two int wrappers are  
equal).


Here is the method in question:

- (void) addToAddedCharAtPosition:(int)charPosition withKey: 
(TMIntWrapper *)key {
	NSLog  
(@___ 
);

NSLog (@The key is: %@, key);
	NSLog (@ The object for the key is: %@, [addedToDbString  
objectForKey:key]);

if ([addedToDbString objectForKey:key] == nil) {
		NSMutableString *ms = [[NSMutableString alloc]initWithString: 
[inText substringWithRange:NSMakeRange(charPosition-1, 1)]];

NSLog(@  The ms string is: %@, ms);
[addedToDbString setObject:[ms mutableCopy] forKey:[key copy]];
		NSLog(@ We are trying to add this: %@, [inText  
substringWithRange:NSMakeRange(charPosition-1, 1)]);
		NSLog (@AND NOW: The object for the key is: %@, [addedToDbString  
objectForKey:key]);

return;
}
	NSLog (@We are trying to add this: %@,[inText  
substringWithRange:NSMakeRange(charPosition-1, 1)]);
	[[addedToDbString objectForKey:key] appendString:[inText  
substringWithRange:NSMakeRange(charPosition-1, 1)]];

}

And here is what those NSLogs generate.



2009-03-10 21:09:48.871 SQL doc[13532:10b]  
___
2009-03-10 21:09:48.872 SQL doc[13532:10b]  
The key is: 0
2009-03-10 21:09:48.872 SQL doc[13532:10b]  The object for  
the key is: (null)
2009-03-10 21:09:48.873 SQL doc[13532:10b]   The ms  
string is: x
2009-03-10 21:09:48.874 SQL doc[13532:10b]  We are trying to  
add this: x
2009-03-10 21:09:48.875 SQL doc[13532:10b] AND NOW: The object for  
the key is: (null)
2009-03-10 21:09:48.875 SQL doc[13532:10b]  
___
2009-03-10 21:09:48.877 SQL doc[13532:10b]  
The key is: 0
2009-03-10 21:09:48.877 SQL doc[13532:10b]  The object for  
the key is: (null)
2009-03-10 21:09:48.879 SQL doc[13532:10b]   The ms  
string is: e
2009-03-10 21:09:48.880 SQL doc[13532:10b]  We are trying to  
add this: e
2009-03-10 21:09:48.880 SQL doc[13532:10b] AND NOW: The object for  
the key is: e
2009-03-10 21:09:48.880 SQL doc[13532:10b]  
___


Please help me...


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Re: Garbage collected and non-garbage collected

[Robert Mullen]

Too little resource, too little experience, too little return. The  
first two are because this is a skunk works type corporate project  
that basically has myself (an ex-.NET and general Windows coder) as  
it's resource so is constrained by me. The third is because I don't  
see sufficient gain to doing all the memory management myself. GC  
systems have become efficient enough in our modern world that I think  
manual memory management has become pretty specialized and out of  
place in 80% of desktop applications. Certainly there is the other 20%  
of high performance and real time situations but mine is basically a  
pretty face on a database. Anybody want to argue the other direction?  
I am always willing to learn.


On Mar 10, 2009, at 11:39 AM, I. Savant wrote:

On Tue, Mar 10, 2009 at 2:16 PM, Robert Mullen robe...@autowc.com  
wrote:



Going non-GC is not an option for our main project


 If you don't mind my asking ... why? Too much work invested?

--
I.S.



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Re: NSMutableDictionary drives me mad.

[Clark Cox]

On Tue, Mar 10, 2009 at 11:33 AM, Тимофей Даньшин ok5.ad...@gmail.com wrote:
 Hello.
 I am writing a method for searching for the longest common substring. The
 idea is to store the pieces of that LCS in an NSMutableDictionary with
 TMIntWrappers as keys and NSMutableStrings as values.
 Now, TMIntWrapper is the class i created for wrapping ints into objects. It
 stores an int, gives access to it via the .value property, adopts the
 NSCopying protocol and implements the -(BOOL) isEqual: (id) object method.

(Assuming that you can't use NSNumber for some reason) Have you
implemented -hash? That's an important one.

-- 
Clark S. Cox III
clarkc...@gmail.com
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Re: Garbage collected and non-garbage collected

[I. Savant]

On Tue, Mar 10, 2009 at 2:47 PM, Robert Mullen robe...@autowc.com wrote:

 GC systems have become efficient enough in our modern world that I think 
 manual memory management  has become pretty specialized and out of place in 
 80% of desktop applications.

  I won't disagree there.


 Anybody want to argue the other direction? I am always willing to learn.

  Sure: Projected time invested in GC'ifying the other framework(s)?   :-)

--
I.S.
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Re: Garbage collected and non-garbage collected

[Robert Mullen]

I also have the option of abandoning the framework and functionality  
although that is not an appealing option. I am enjoying the process of  
determining the course to rectify GC in this framework (in a perverse  
sort of way) but I am not sure how long that will last. Every time I  
run into a persistent problem it is an opportunity to learn Cocoa, X- 
Code, and Objective-C a little better and that is fun in a challenging  
way. I know from experience though that this can turn from an  
enjoyably challenging diversion into a frustratingly endless cycle of  
refactoring. Wish me luck...


On Mar 10, 2009, at 11:57 AM, I. Savant wrote:

On Tue, Mar 10, 2009 at 2:47 PM, Robert Mullen robe...@autowc.com  
wrote:


GC systems have become efficient enough in our modern world that I  
think manual memory management  has become pretty specialized and  
out of place in 80% of desktop applications.


 I won't disagree there.


Anybody want to argue the other direction? I am always willing to  
learn.


 Sure: Projected time invested in GC'ifying the other  
framework(s)?   :-)


--
I.S.



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Re: Garbage collected and non-garbage collected

[I. Savant]

On Tue, Mar 10, 2009 at 3:07 PM, Robert Mullen robe...@autowc.com wrote:
 I also have the option of abandoning the framework and functionality
 although that is not an appealing option. I am enjoying the process of
 determining the course to rectify GC in this framework (in a perverse sort
 of way) but I am not sure how long that will last. Every time I run into a
 persistent problem it is an opportunity to learn Cocoa, X-Code, and
 Objective-C a little better and that is fun in a challenging way. I know
 from experience though that this can turn from an enjoyably challenging
 diversion into a frustratingly endless cycle of refactoring. Wish me luck...

  Luck!

  Consider also, though, that learning the Retain / Release memory
management approach is just as much an opportunity to learn. For your
project, it sounds like the odds tip in favor of getting everything
GC-compliant, but as you said, time and (bad) experience may change
that view ... ;-)

--
I.S.
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Intercepting events from a control

[David Alter]

I need to know about events destine for a specific control. Is there a way
to receive these events with out subclassing the control. All I have is a
reference to the control. I need events like MouseDown, MouseUp. It would
also be very helpful if I knew when the control became the first responder
and resigned first responder.

Is there a way to do this?

thanks for the help
-dave
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Re: Intercepting events from a control

[Kyle Sluder]

On Tue, Mar 10, 2009 at 3:43 PM, David Alter alterconsult...@gmail.com wrote:
 Is there a way to do this?

Subclass the control and override -mouseDown:, -mouseUp:,
-becomeFirstResponder, and -resignFirstResponder?  Seems
straightforward to me.

--Kyle Sluder
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Re: Intercepting events from a control

[Dave DeLong]

Subclassing isn't always an option (For example, NSButton is a class  
cluster).


I've done something like this for iPhone, where I've embedded the  
control in a UIView, then set userInteractionEnabled to NO on the  
control, so that the tap events would fall through to the UIView  
underneath.  The UIView handles the events how it needs to, then  
passes the taps back to the control for proper visual behavior.


I'm not sure how that would translate to the Mac, but maybe it helps  
you.  =)


Cheers,

Dave

On Mar 10, 2009, at 1:47 PM, Kyle Sluder wrote:

On Tue, Mar 10, 2009 at 3:43 PM, David Alter alterconsult...@gmail.com 
 wrote:

Is there a way to do this?


Subclass the control and override -mouseDown:, -mouseUp:,
-becomeFirstResponder, and -resignFirstResponder?  Seems
straightforward to me.

--Kyle Sluder
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[MEET] LA CocoaHeads 3/12/09 at 7:30pm

[Rob Ross]

Greetings LA CocoaHeads.

This Thursday we have a special guest speaker, Paul Agron, coming up  
all the way from San Diego to give us a presentation on a logging  
framework he's developed. Check out his blog here:



http://www.fibrethread.com/blog/

Since he's coming from San Diego, I hope we can have a good turn out  
for him, especially from those of us who don't live so far away :)




We meet at the offices of E! Entertainment at 7:30pm.

Our meeting location is

5750 Wilshire Blvd
Los Angeles, CA 90036.

Here's a google map of the location:

http://www.google.com/maps?f=qhl=enq=5750+Wilshire+Blvd,+Los+Angeles+CA+90036ie=UTF8z=15om=1iwloc=addr

Free street parking is available after 8pm - FEED THE METER UP TO 8PM  
OR YOU MIGHT GET A TICKET!


I'd suggest trying Masselin Ave, which is one block East of Courtyard  
Place.


We meet near the lobby of the West building at 5750 Wilshire Blvd, on  
the West side of Courtyard Place. There are picknick tables in front  
of the lobby and we'll gather there starting at 7:20pm. From there we  
go inside and up to conference room 3A at around 7:45pm .


If you arrive late, please ask the building security personnel in the  
lobby to direct you to the E! Security office, and they will be able  
to contact the group in conference room 3A and send someone down to  
meet you.



Rob Ross, Lead Software Engineer
E! Networks

---
Beware of he who would deny you access to information, for in his  
heart he dreams himself your master. -- Commissioner Pravin Lal

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Re: Garbage collected and non-garbage collected

[Bill Bumgarner]

On Mar 10, 2009, at 12:21 PM, I. Savant wrote:
On Tue, Mar 10, 2009 at 3:07 PM, Robert Mullen robe...@autowc.com  
wrote:

I also have the option of abandoning the framework and functionality
although that is not an appealing option. I am enjoying the process  
of
determining the course to rectify GC in this framework (in a  
perverse sort
of way) but I am not sure how long that will last. Every time I run  
into a

persistent problem it is an opportunity to learn Cocoa, X-Code, and
Objective-C a little better and that is fun in a challenging way. I  
know
from experience though that this can turn from an enjoyably  
challenging
diversion into a frustratingly endless cycle of refactoring. Wish  
me luck...


 Luck!

 Consider also, though, that learning the Retain / Release memory
management approach is just as much an opportunity to learn. For your
project, it sounds like the odds tip in favor of getting everything
GC-compliant, but as you said, time and (bad) experience may change
that view ... ;-)


So... is the framework open source? Got a pointer? Any kind of test  
case?   Can you post more information about the crash?  What does the  
stack trace look like?   Got an address?  What does malloc_history  
say?  Can..? Got..? Have you tried..?


Let's pull this post back to a technical analysis of the OP's  
problem.  More likely than not, we can fix his framework and,  
hopefully, that'll be one less barrier to entry for everyone.


b.bum

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Re: Intercepting events from a control

[I. Savant]

On Tue, Mar 10, 2009 at 3:43 PM, David Alter alterconsult...@gmail.com wrote:
 I need to know about events destine for a specific control. Is there a way
 to receive these events with out subclassing the control. All I have is a
 reference to the control. I need events like MouseDown, MouseUp. It would
 also be very helpful if I knew when the control became the first responder
 and resigned first responder.

  How about a more detailed description of what you intend to
accomplish with a reference to the event / notifications of mouse 
responder status? Maybe there's a better way ...

--
I.S.
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[MEET] BYU CocoaHeads 12 Mar 2009

[Dave DeLong]

Hey everyone,

The BYU CocoaHeads will be having their monthly meeting this Thursday  
from 7 to 9 pm in W310 TNRB on BYU campus in Provo, UT.  Dan Reese  
from Mozy (http://www.mozy.com) will be coming to talk about Cocoa at  
Mozy, and we'll also be having a presentation on simple Bonjour  
networking.


Everyone is welcome to come (and there are no parking meters to feed!).

See you there!

Dave DeLong
President, BYU CocoaHeads
http://cocoaheads.byu.edu
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Re: Intercepting events from a control

[Paul Sanders]

 NSButton is a class cluster

Are you sure about that?  I don't see it anywhere in the docs.  Perhaps its 
an iPhone thing. 

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Re: Intercepting events from a control

[Dave DeLong]

Ah, you're right.  It is on the iPhone (from what I tell; my attempts  
to subclass it never worked), and I was assuming the Mac side was the  
same.


Anyway ending thread hijack.  =)

Dave

On Mar 10, 2009, at 2:10 PM, Paul Sanders wrote:


NSButton is a class cluster


Are you sure about that?  I don't see it anywhere in the docs.   
Perhaps its

an iPhone thing.



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Re: Garbage collected and non-garbage collected

[Robert Mullen]

The framework is open source. It is the SM2DGraphView Framework. I  
have posted on the Snowmint forum but not getting anything. I think  
that is understandable as the original author built this for his own  
purpose and released it to the world out of generosity. I have made  
some minor mods to the code base already and don't mind making others  
but not sure what the quality of the changes will be given my  
inexperience. If this were .NET I would have no hesitation as I am  
fluent and experienced. I simply don't have that confidence yet with  
Cocoa and Objective-C. In the debugging I am doing right now I have  
noticed that there is a struct with private data the framework uses  
and one element of this struct is an NSMutableDictionary of text  
attributes. This is definitely one source of problems as reading from  
this element causes bad access. I insert some logging to look at this  
element and it has so far contained com.apple.disk-imagp ,  
NSCFType: 0x186f4a0, and NSExtraMIData: 0x186f7e0 but not an  
NSMutableDictionary. Pretty clearly I am not getting the memory that  
is expected but my first glance at the code exposes no holes that are  
obvious to me. This was addressed once before on the Snowmint forum  
with that poster exhibiting the same crash symptoms but the thread  
went silent after the framework author asked specific questions about  
what is not working. Any pointers (bad pun intended) would be  
appreciated. I wouldn't mind debugging this myself with the help of a  
few more experienced coders. I do understand the basic tenets of  
memory management but am also not greatly experienced there.



On Mar 10, 2009, at 12:56 PM, Bill Bumgarner wrote:


On Mar 10, 2009, at 12:21 PM, I. Savant wrote:
On Tue, Mar 10, 2009 at 3:07 PM, Robert Mullen robe...@autowc.com  
wrote:

I also have the option of abandoning the framework and functionality
although that is not an appealing option. I am enjoying the  
process of
determining the course to rectify GC in this framework (in a  
perverse sort
of way) but I am not sure how long that will last. Every time I  
run into a

persistent problem it is an opportunity to learn Cocoa, X-Code, and
Objective-C a little better and that is fun in a challenging way.  
I know
from experience though that this can turn from an enjoyably  
challenging
diversion into a frustratingly endless cycle of refactoring. Wish  
me luck...


Luck!

Consider also, though, that learning the Retain / Release memory
management approach is just as much an opportunity to learn. For your
project, it sounds like the odds tip in favor of getting everything
GC-compliant, but as you said, time and (bad) experience may change
that view ... ;-)


So... is the framework open source? Got a pointer? Any kind of test  
case?   Can you post more information about the crash?  What does  
the stack trace look like?   Got an address?  What does  
malloc_history say?  Can..? Got..? Have you tried..?


Let's pull this post back to a technical analysis of the OP's  
problem.  More likely than not, we can fix his framework and,  
hopefully, that'll be one less barrier to entry for everyone.


b.bum




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Re: [SOLVED] Re: NSArrayController -- will change selection?

[Stuart Malin]

On Mar 7, 2009, at 3:57 PM, Kyle Sluder wrote:

On Sat, Mar 7, 2009 at 8:55 PM, Stuart Malin stu...@zhameesha.com  
wrote:
Those are the only three means I am aware of (selection, window  
close, view

change) that can potentially lead to loss of user data. Any others?


Add and remove.  You'd probably want to handle those conditions
without involving the table view at all.


Re: remove:  Why ask for a decision about pending changes if the  
selected item is about to be removed? Instead, I display a remove  
confirmation sheet. The user can cancel that, and the pending changes  
remain pending.


Also, must handle Quit of the application.

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Re: [SOLVED] Re: NSArrayController -- will change selection?

[Kyle Sluder]

On Tue, Mar 10, 2009 at 4:33 PM, Stuart Malin stu...@zhameesha.com wrote:
 Re: remove:  Why ask for a decision about pending changes if the selected
 item is about to be removed? Instead, I display a remove confirmation sheet.
 The user can cancel that, and the pending changes remain pending.

Fair enough.  I just thought of add and the pair came to mind.

 Also, must handle Quit of the application.

This is true, but might be covered by closing the window or the
document, depending on how your app is architected.

--Kyle Sluder
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setFrame: not working in custom event loop

[Mike Manzano]

Hi,

I am tracking the mouse pointer to dynamically resize a splitter as a  
separate drag handle is dragged. This is done in mouseDown: of the  
drag handle with a custom event loop. The loop looks like this:


while (keepOn)
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
theEvent = [[self window] nextEventMatchingMask:  
NSAnyEventMask] ;// NSLeftMouseUpMask | NSLeftMouseDraggedMask];


switch ([theEvent type])
{
case NSLeftMouseUp:
keepOn = NO;
break;

case NSLeftMouseDragged:
[nc postNotificationName:NSSplitViewWillResizeSubviewsNotification  
object:splitView];

firstFrame = [[[splitView subviews] 
objectAtIndex:0] frame];
firstFrame.size.width = (isLeftResizer ?
		 MAX(0,roundf(([splitViewconvertPoint:[theEvent  
locationInWindow] fromView:nil].x + offset) - firstFrame.origin.x)) :
		 MAX(0,roundf([splitViewconvertPoint:[theEvent  
locationInWindow] fromView:nil].x - [splitViewdividerThickness] -  
offset)));


firstFrame.size.width = 
MIN(MAX(firstFrame.size.width,min),max);

NSLog( @SetFrame: %@ , 
NSStringFromRect(firstFrame) ) ;
[[[splitView subviews] objectAtIndex:0] 
setFrame:firstFrame];
NSLog( @\tIs Now: %@ , NSStringFromRect([[[splitView subviews]  
objectAtIndex:0] frame]) ) ;


[splitView adjustSubviews];
[nc postNotificationName:NSSplitViewDidResizeSubviewsNotification  
object:splitView];

break;
default:
break;
}
[pool release] ;
}

	NSLog( @Finally: %@ , NSStringFromRect([[[splitView subviews]  
objectAtIndex:0] frame]) ) ;



(you might recognize this is as the Scrivener custom split view code  
available on the web)


Anyway, the visual updates to the screen seem to start lagging the  
further right I drag the handle. You can see the NSLog()s I have in  
the code; here is the output as I drag:


[...]
2009-03-10 14:37:42.428 SkootUI[8830:10b] SetFrame: {{0, 0}, {718, 604}}
2009-03-10 14:37:42.444 SkootUI[8830:10b]   Is Now: {{0, 0}, {718, 604}}
2009-03-10 14:37:42.511 SkootUI[8830:10b] SetFrame: {{0, 0}, {721, 604}}
2009-03-10 14:37:42.539 SkootUI[8830:10b]   Is Now: {{0, 0}, {721, 604}}
2009-03-10 14:37:42.596 SkootUI[8830:10b] SetFrame: {{0, 0}, {723, 604}}
2009-03-10 14:37:42.600 SkootUI[8830:10b]   Is Now: {{0, 0}, {723, 604}}
2009-03-10 14:37:44.101 SkootUI[8830:10b] Finally: {{0, 0}, {684, 604}}

As you can see, as far as the view being resized is concerned, it is  
being set to what I set it to as I drag the handle; i.e., the  
SetFrame: dimensions match the Is Now: dimensions. During this  
time, however, I can see the view sizing visually lag. When the drag  
finishes and the Finally block prints out, querying the view for its  
frame displays what I believe to be the actual lagged dimensions.


Can anyone tell me what's going on?

Thanks,

Mike
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Background Process?

[Pierce Freeman]

Hi everyone:

I am wondering how to create a background process that will only run when
the user is logged in and will run every certain minutes (a bit like Time
Machine).  I am also not sure in which way the action in the background
process would be programmed, so any information regarding this would be
great.


Thanks for any help.


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Re: Background Process?

[Benjamin Dobson]

On 10 Mar 2009, at 23:11:03, Pierce Freeman wrote:


Hi everyone:

I am wondering how to create a background process that will only run  
when
the user is logged in and will run every certain minutes (a bit like  
Time
Machine).  I am also not sure in which way the action in the  
background
process would be programmed, so any information regarding this would  
be

great.


Thanks for any help.


launchd. Take a look at Lingon http://tuppis.com/lingon/ for a quick  
practical look at what it does. And Google. Always Google.

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Why does releasing this array cause a crash?

[James Cicenia]

Hello

I am confused on this one:

In my method I have a local array:

NSMutableArray *arraySubType = [[NSMutableArray alloc]init];


Then in a loop from the database I have:

while (sqlite3_step(statement) == SQLITE_ROW) {

if(![aDict objectForKey: [NSString stringWithUTF8String:(char  
*)sqlite3_column_text(statement, 1)]]){

NSMutableArray *tmpArray = [[NSMutableArray alloc]init];
	[aDict setValue:tmpArray forKey: [NSString stringWithUTF8String:(char  
*)sqlite3_column_text(statement, 1)]];

[tmpArray release];
}
arraySubType = [aDict objectForKey: [NSString stringWithUTF8String: 
(char *)sqlite3_column_text(statement, 1)]];
[arraySubType addObject: [NSString stringWithUTF8String:(char  
*)sqlite3_column_text(statement, 0)]]
[aDict setValue:arraySubType forKey: [NSString stringWithUTF8String: 
(char *)sqlite3_column_text(statement, 1)]];


}

Shouldn't I now release arraySubType ??

If I do, later on I get a crash, if I don't I get no crash.

Thanks
James Cicenia

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Re: Why does releasing this array cause a crash?

[Randall Meadows]

On Mar 10, 2009, at 4:35 PM, James Cicenia wrote:


NSMutableArray *arraySubType = [[NSMutableArray alloc]init];


OK, this array, you *should* release, yes.


Then in a loop from the database I have:

while (sqlite3_step(statement) == SQLITE_ROW) {

if(![aDict objectForKey: [NSString stringWithUTF8String:(char  
*)sqlite3_column_text(statement, 1)]]){

NSMutableArray *tmpArray = [[NSMutableArray alloc]init];
	[aDict setValue:tmpArray forKey: [NSString stringWithUTF8String: 
(char *)sqlite3_column_text(statement, 1)]];

[tmpArray release];
}
arraySubType = [aDict objectForKey: [NSString stringWithUTF8String: 
(char *)sqlite3_column_text(statement, 1)]];


You have now just overwritten the previous value of arraySubType, thus  
leaking it.  You now have a handle to a completely different object,  
which is autoreleased.  This is why when you do release it, you crash  
later.


If you do not use arraySubType between the alloc/init above and this  
line, then you do not need to alloc/init it, just declare it only.

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Re: Garbage collected and non-garbage collected

[Bill Bumgarner]

On Mar 10, 2009, at 1:17 PM, Robert Mullen wrote:
The framework is open source. It is the SM2DGraphView Framework. I  
have posted on the Snowmint forum but not getting anything. I think  
that is understandable as the original author built this for his own  
purpose and released it to the world out of generosity. I have made  
some minor mods to the code base already and don't mind making  
others but not sure what the quality of the changes will be given my  
inexperience. If this were .NET I would have no hesitation as I am  
fluent and experienced. I simply don't have that confidence yet with  
Cocoa and Objective-C. In the debugging I am doing right now I have  
noticed that there is a struct with private data the framework  
uses and one element of this struct is an NSMutableDictionary of  
text attributes. This is definitely one source of problems as  
reading from this element causes bad access. I insert some logging  
to look at this element and it has so far contained com.apple.disk- 
imagp , NSCFType: 0x186f4a0, and NSExtraMIData: 0x186f7e0 but  
not an NSMutableDictionary. Pretty clearly I am not getting the  
memory that is expected but my first glance at the code exposes no  
holes that are obvious to me. This was addressed once before on the  
Snowmint forum with that poster exhibiting the same crash symptoms  
but the thread went silent after the framework author asked specific  
questions about what is not working. Any pointers (bad pun intended)  
would be appreciated. I wouldn't mind debugging this myself with the  
help of a few more experienced coders. I do understand the basic  
tenets of memory management but am also not greatly experienced there.


Sounds like the collector has reaped the location in the struct a wee- 
tad earlier than the code would like.


Try declaring the NSMutableDictionary * as __strong

{

__strong NSMutableDictionary *bob;

}

If that doesn't work, you can call CFRetain() / CFRelease() on the  
dictionary reference as it goes in/out of the struct [instead of - 
retain/-release].


Also -- look through the -dealloc methods in the framework.   You'll  
want to create a -finalize for any that do anything beyond -release of  
objects/[super dealloc] (Though you don't need to unregister  
notification observers).


- free()s  CFRelease()s can be copied directly to -finalize

- close() and other resource management *may* be copied, but you need  
to be careful about scarce resource management in -finalize as that  
can be problematic


Anything else?   Depends... be careful about order dependencies.  And  
you really want to avoid allocating or retaining anything in your  
finalizer.   Avoid mucking with the object graph.


All very vague, I know, but that is in the hopes that you won't have  
to dive deep.  If you do, post some details and we'll see what we can  
do.


b.bum
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Re: Why does releasing this array cause a crash?

[James Cicenia]

Ah...

Thank you. I understand now.

James

On Mar 10, 2009, at 5:41 PM, Randall Meadows wrote:


On Mar 10, 2009, at 4:35 PM, James Cicenia wrote:


NSMutableArray *arraySubType = [[NSMutableArray alloc]init];


OK, this array, you *should* release, yes.


Then in a loop from the database I have:

while (sqlite3_step(statement) == SQLITE_ROW) {

if(![aDict objectForKey: [NSString stringWithUTF8String:(char  
*)sqlite3_column_text(statement, 1)]]){

NSMutableArray *tmpArray = [[NSMutableArray alloc]init];
	[aDict setValue:tmpArray forKey: [NSString stringWithUTF8String: 
(char *)sqlite3_column_text(statement, 1)]];

[tmpArray release];
}
arraySubType = [aDict objectForKey: [NSString stringWithUTF8String: 
(char *)sqlite3_column_text(statement, 1)]];


You have now just overwritten the previous value of arraySubType,  
thus leaking it.  You now have a handle to a completely different  
object, which is autoreleased.  This is why when you do release it,  
you crash later.


If you do not use arraySubType between the alloc/init above and this  
line, then you do not need to alloc/init it, just declare it only.


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Re: Garbage collected and non-garbage collected

[Sean McBride]

On 3/10/09 3:46 PM, Bill Bumgarner said:

Also -- look through the -dealloc methods in the framework.   You'll
want to create a -finalize for any that do anything beyond -release of
objects/[super dealloc] (Though you don't need to unregister
notification observers).

- free()s  CFRelease()s can be copied directly to -finalize

Bill,

This reminds me Do you know if one can safely call IOObjectRelease()
in finalize?  The docs do not say if that function is thread-safe.
rdar://problem/6307385.  I have a real life situation where
IOObjectRelease() is called in dealloc, but in GC I'm erring on the side
of caution and leaking.

Cheers,

--

Sean McBride, B. Eng s...@rogue-research.com
Rogue Researchwww.rogue-research.com
Mac Software Developer  Montréal, Québec, Canada


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What is using up so much memory here?

[James Cicenia]

Ok -

Here is the offending code that sucks up about 2MB:

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
while(thisState = [statesEnum nextObject]){
	UIImageView *singleStateView =  [[[UIImageView  
alloc]initWithFrame:CGRectMake(2,0,  293, 184)]autorelease];
	[singleStateView setImage: [UIImage imageNamed:[[@wf-map-gray-  
stringByAppendingString:thisState 
]stringByAppendingString:@_glow.png]]];

[singleStateView setTag:100];
[fruitStateView addSubview:singleStateView];
}
[pool release];

These are little pngs of the states. They are tiny 4KB images
yet when this loop runs it winds up taking up an additional 2MB

Thanks
James Ciceni

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Re: What is using up so much memory here?

[David Duncan]

On Mar 10, 2009, at 4:26 PM, James Cicenia wrote:


Ok -

Here is the offending code that sucks up about 2MB:

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
while(thisState = [statesEnum nextObject]){
	UIImageView *singleStateView =  [[[UIImageView  
alloc]initWithFrame:CGRectMake(2,0,  293, 184)]autorelease];
	[singleStateView setImage: [UIImage imageNamed:[[@wf-map-gray-  
stringByAppendingString:thisState 
]stringByAppendingString:@_glow.png]]];

[singleStateView setTag:100];
[fruitStateView addSubview:singleStateView];
}
[pool release];

These are little pngs of the states. They are tiny 4KB images
yet when this loop runs it winds up taking up an additional 2MB



Compressed size does not matter. Your images (or at least your image  
views) are 293x184, which means that each view is going to consume  
293x184x4 (bytes per pixel) = 210.6K. I presume your looking at the  
Memory Monitor tool, as the memory used by view backing stores is not  
reflected in the memory usage as reported by the ObjectAlloc tool, but  
assuming your PNGs are the same size as the view, that 210.6K number  
is far more indicative of memory usage than the compressed size.

--
David Duncan
Apple DTS Animation and Printing

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Re: What is using up so much memory here?

[Dave Camp]

On Mar 10, 2009, at 4:26 PM, James Cicenia wrote:


Here is the offending code that sucks up about 2MB:

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
while(thisState = [statesEnum nextObject]){
	UIImageView *singleStateView =  [[[UIImageView  
alloc]initWithFrame:CGRectMake(2,0,  293, 184)]autorelease];
	[singleStateView setImage: [UIImage imageNamed:[[@wf-map-gray-  
stringByAppendingString:thisState 
]stringByAppendingString:@_glow.png]]];

[singleStateView setTag:100];
[fruitStateView addSubview:singleStateView];
}
[pool release];

These are little pngs of the states. They are tiny 4KB images
yet when this loop runs it winds up taking up an additional 2MB


Well, the PNG files are 4KB. The images are approximately 215KB when  
decompressed (293 * 184 * 4 bytes/pixel = 215,648). Probably slightly  
larger when the rows are padded out (assuming the PNG images are the  
size of the view you are creating in the code you supplied).


Dave
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Re: What is using up so much memory here?

[James Cicenia]

Interesting... I didn't know that, but then it begs the question  
what do the cool kids do?
Should I be taking a different approach here? If so, any pointers or  
doc chapter would be

great.

Thank you
James Cicenia



On Mar 10, 2009, at 6:33 PM, David Duncan wrote:


On Mar 10, 2009, at 4:26 PM, James Cicenia wrote:


Ok -

Here is the offending code that sucks up about 2MB:

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
while(thisState = [statesEnum nextObject]){
	UIImageView *singleStateView =  [[[UIImageView  
alloc]initWithFrame:CGRectMake(2,0,  293, 184)]autorelease];
	[singleStateView setImage: [UIImage imageNamed:[[@wf-map-gray-  
stringByAppendingString:thisState 
]stringByAppendingString:@_glow.png]]];

[singleStateView setTag:100];
[fruitStateView addSubview:singleStateView];
}
[pool release];

These are little pngs of the states. They are tiny 4KB images
yet when this loop runs it winds up taking up an additional 2MB



Compressed size does not matter. Your images (or at least your image  
views) are 293x184, which means that each view is going to consume  
293x184x4 (bytes per pixel) = 210.6K. I presume your looking at the  
Memory Monitor tool, as the memory used by view backing stores is  
not reflected in the memory usage as reported by the ObjectAlloc  
tool, but assuming your PNGs are the same size as the view, that  
210.6K number is far more indicative of memory usage than the  
compressed size.

--
David Duncan
Apple DTS Animation and Printing



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Re: What is using up so much memory here?

[David Duncan]

On Mar 10, 2009, at 4:41 PM, James Cicenia wrote:

Interesting... I didn't know that, but then it begs the question  
what do the cool kids do?
Should I be taking a different approach here? If so, any pointers or  
doc chapter would be

great.



All depends on what you are trying to accomplish. Typically you avoid  
loading anything you don't need and release anything when your done  
with it. And you may want to switch to imageWithContentsOfFile: until  
you can prove that the caching behavior of imageNamed: is providing  
you with a performance improvement.

--
David Duncan
Apple DTS Animation and Printing

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Re: What is using up so much memory here?

[James Cicenia]

I am just overlaying colored state images over a map of the US.

I don't need performance here, just memory efficiency. I will try  
imageWithContetsOfFile.


Thanks
James

On Mar 10, 2009, at 6:45 PM, David Duncan wrote:


On Mar 10, 2009, at 4:41 PM, James Cicenia wrote:

Interesting... I didn't know that, but then it begs the  
question what do the cool kids do?
Should I be taking a different approach here? If so, any pointers  
or doc chapter would be

great.



All depends on what you are trying to accomplish. Typically you  
avoid loading anything you don't need and release anything when your  
done with it. And you may want to switch to imageWithContentsOfFile:  
until you can prove that the caching behavior of imageNamed: is  
providing you with a performance improvement.

--
David Duncan
Apple DTS Animation and Printing



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Re: What is using up so much memory here?

[Dave Camp]

Well, since you obviously can't have all of those images on screen at  
the same time at full size, you should either just load what you need  
or resize them to a more appropriate size.


Dave

On Mar 10, 2009, at 4:41 PM, James Cicenia wrote:

Interesting... I didn't know that, but then it begs the question  
what do the cool kids do?
Should I be taking a different approach here? If so, any pointers or  
doc chapter would be

great.

Thank you
James Cicenia



On Mar 10, 2009, at 6:33 PM, David Duncan wrote:


On Mar 10, 2009, at 4:26 PM, James Cicenia wrote:


Ok -

Here is the offending code that sucks up about 2MB:

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
while(thisState = [statesEnum nextObject]){
	UIImageView *singleStateView =  [[[UIImageView  
alloc]initWithFrame:CGRectMake(2,0,  293, 184)]autorelease];
	[singleStateView setImage: [UIImage imageNamed:[[@wf-map-gray-  
stringByAppendingString:thisState 
]stringByAppendingString:@_glow.png]]];

[singleStateView setTag:100];
[fruitStateView addSubview:singleStateView];
}
[pool release];

These are little pngs of the states. They are tiny 4KB images
yet when this loop runs it winds up taking up an additional 2MB



Compressed size does not matter. Your images (or at least your  
image views) are 293x184, which means that each view is going to  
consume 293x184x4 (bytes per pixel) = 210.6K. I presume your  
looking at the Memory Monitor tool, as the memory used by view  
backing stores is not reflected in the memory usage as reported by  
the ObjectAlloc tool, but assuming your PNGs are the same size as  
the view, that 210.6K number is far more indicative of memory usage  
than the compressed size.

--
David Duncan
Apple DTS Animation and Printing



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Re: What is using up so much memory here?

[James Cicenia]

Well... easier said then done. How would one place irregular shapes of  
the state over the map itself?

Any combination of states with a color needs to appear.

I was just overlaying the same square with just one state in the  
square all lined up.


James


On Mar 10, 2009, at 6:51 PM, Dave Camp wrote:

Well, since you obviously can't have all of those images on screen  
at the same time at full size, you should either just load what you  
need or resize them to a more appropriate size.


Dave

On Mar 10, 2009, at 4:41 PM, James Cicenia wrote:

Interesting... I didn't know that, but then it begs the  
question what do the cool kids do?
Should I be taking a different approach here? If so, any pointers  
or doc chapter would be

great.

Thank you
James Cicenia



On Mar 10, 2009, at 6:33 PM, David Duncan wrote:


On Mar 10, 2009, at 4:26 PM, James Cicenia wrote:


Ok -

Here is the offending code that sucks up about 2MB:

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
while(thisState = [statesEnum nextObject]){
	UIImageView *singleStateView =  [[[UIImageView  
alloc]initWithFrame:CGRectMake(2,0,  293, 184)]autorelease];
	[singleStateView setImage: [UIImage imageNamed:[[@wf-map-gray-  
stringByAppendingString:thisState 
]stringByAppendingString:@_glow.png]]];

[singleStateView setTag:100];
[fruitStateView addSubview:singleStateView];
}
[pool release];

These are little pngs of the states. They are tiny 4KB images
yet when this loop runs it winds up taking up an additional 2MB



Compressed size does not matter. Your images (or at least your  
image views) are 293x184, which means that each view is going to  
consume 293x184x4 (bytes per pixel) = 210.6K. I presume your  
looking at the Memory Monitor tool, as the memory used by view  
backing stores is not reflected in the memory usage as reported by  
the ObjectAlloc tool, but assuming your PNGs are the same size as  
the view, that 210.6K number is far more indicative of memory  
usage than the compressed size.

--
David Duncan
Apple DTS Animation and Printing



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Re: What is using up so much memory here?

[David Duncan]

On Mar 10, 2009, at 4:50 PM, James Cicenia wrote:


I am just overlaying colored state images over a map of the US.

I don't need performance here, just memory efficiency. I will try  
imageWithContetsOfFile.



And just to be clear, imageWithContentsOfFile: vs imageNamed: won't  
save you any memory per image, it only prevents the image from being  
put into the image cache, which may help your performance in other ways.


Dave Camp's suggestions are probably a good starting point. Only load  
images you need to display, and if they don't need to be as large as  
they are, shrink them (when creating the content, not after loading  
them).

--
David Duncan
Apple DTS Animation and Printing

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Re: What is using up so much memory here?

[James Cicenia]

Ok -

I figured out what I can do. I can make a database of the x/y  
coordinates after chopping down each state and then read the database  
info to place the states.


Thanks for your hints and time.

James

On Mar 10, 2009, at 6:51 PM, Dave Camp wrote:

Well, since you obviously can't have all of those images on screen  
at the same time at full size, you should either just load what you  
need or resize them to a more appropriate size.


Dave

On Mar 10, 2009, at 4:41 PM, James Cicenia wrote:

Interesting... I didn't know that, but then it begs the  
question what do the cool kids do?
Should I be taking a different approach here? If so, any pointers  
or doc chapter would be

great.

Thank you
James Cicenia



On Mar 10, 2009, at 6:33 PM, David Duncan wrote:


On Mar 10, 2009, at 4:26 PM, James Cicenia wrote:


Ok -

Here is the offending code that sucks up about 2MB:

NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
while(thisState = [statesEnum nextObject]){
	UIImageView *singleStateView =  [[[UIImageView  
alloc]initWithFrame:CGRectMake(2,0,  293, 184)]autorelease];
	[singleStateView setImage: [UIImage imageNamed:[[@wf-map-gray-  
stringByAppendingString:thisState 
]stringByAppendingString:@_glow.png]]];

[singleStateView setTag:100];
[fruitStateView addSubview:singleStateView];
}
[pool release];

These are little pngs of the states. They are tiny 4KB images
yet when this loop runs it winds up taking up an additional 2MB



Compressed size does not matter. Your images (or at least your  
image views) are 293x184, which means that each view is going to  
consume 293x184x4 (bytes per pixel) = 210.6K. I presume your  
looking at the Memory Monitor tool, as the memory used by view  
backing stores is not reflected in the memory usage as reported by  
the ObjectAlloc tool, but assuming your PNGs are the same size as  
the view, that 210.6K number is far more indicative of memory  
usage than the compressed size.

--
David Duncan
Apple DTS Animation and Printing



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Re: What is using up so much memory here?

[Graham Cox]

On 11/03/2009, at 11:00 AM, James Cicenia wrote:

Well... easier said then done. How would one place irregular shapes  
of the state over the map itself?

Any combination of states with a color needs to appear.



Since you are in a much-more memory-constrained environment, you need  
to get smart. Naively loading everything isn't going to work, so you  
need to figure this out.


You have a map of the USA, I guess, and you can see part of it on  
screen at any one time (presumably scrolling to show different parts,  
or zooming in and out to show more or less). You can treat it as a  
bunch of tiled shapes, each having a bounding box. The bboxes will  
overlap a little in many places, but that's OK. All you need to do is  
build a data structure that associates the bboxes with the relevant  
images and graphics, then determine which bboxes intersect the visible  
screen area. For those that don't, you don't need to do anything. For  
those that do, you need to load the graphic elements, scale them as  
appropriate for your zoom (if need be - zoom is usually taken care of  
using the view's scale transform, but you may want to avoid caching a  
full-scale image if your zoom suggests you don't need it) and draw  
them. When you've done that, you can discard them again, or cache them  
for later.


That's the basic M.O. If dynamically loading these images like this is  
too slow, you can then consider a way to cache what you loaded in such  
a way that when you become memory constrained, you can examine the  
cache and discard parts of it that you can't see right now, again by  
testing which bboxes intersect the screen.


The same technique will work for zooming, because all you're doing is  
making the screen area that intersects your data smaller and bigger.  
If you cached a low-resolution graphic for a zoomed-out view, you can  
scale it while zooming is in progress to avoid an expensive re-load,  
then, if needed, reload a higher-res version at the end.


Unfortunately you'll have to figure a scheme for doing all of this out  
for yourself, there isn't anything built-in because the need to do  
this is not all that generalisable. It's not that hard though. I would  
suggest though that using an entire subview for each overlaid image is  
going to hurt badly in terms of performance, scalability and ease of  
implementation. Instead just devise your own data structure that can  
hold objects having a bounding box (which sets the spatial location)  
and a reference to the image(s) it needs. Then when you draw, ask your  
data structure to draw all the cells that intersect the drawing area.  
For those that haven't loaded their images, they should now do so,  
then draw as usual.


The overall data structure would have one object per state, but all it  
needs to maintain when not visible is the bbox. 50 rects is a far  
lower memory footprint than 50 full-sized images.


--Graham


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Re: setFrame: not working in custom event loop

[Jesper Storm Bache]

When you modify a window it registers itself as needing redrawing in  
the current run loop.

If you are performing active tracking, you may have to do so yourself.
Try calling [window flushWindowIfNeeded] on your window at the end of  
your loop (inside the loop).


What is the reason for your explicit tracking?
You should be able to simply listen for mouseDragged, mouseDown, and  
mouseUp on your split view (if this is a custom sub-class).

Jesper Storm Bache

On Mar 10, 2009, at 2:51 PM, Mike Manzano wrote:


Hi,

I am tracking the mouse pointer to dynamically resize a splitter as a
separate drag handle is dragged. This is done in mouseDown: of the
drag handle with a custom event loop. The loop looks like this:

while (keepOn)
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
theEvent = [[self window] nextEventMatchingMask:
NSAnyEventMask] ;// NSLeftMouseUpMask | NSLeftMouseDraggedMask];

switch ([theEvent type])
{
case NSLeftMouseUp:
keepOn = NO;
break;

case NSLeftMouseDragged:
[nc 
postNotificationName:NSSplitViewWillResizeSubviewsNotification
object:splitView];
firstFrame = [[[splitView subviews] 
objectAtIndex:0] frame];
firstFrame.size.width = (isLeftResizer ?

 MAX(0,roundf(([splitViewconvertPoint:[theEvent
locationInWindow] fromView:nil].x + offset) - firstFrame.origin.x)) :

 MAX(0,roundf([splitViewconvertPoint:[theEvent
locationInWindow] fromView:nil].x - [splitViewdividerThickness] -
offset)));

firstFrame.size.width = 
MIN(MAX(firstFrame.size.width,min),max);

NSLog( @SetFrame: %@ , 
NSStringFromRect(firstFrame) ) ;
[[[splitView subviews] objectAtIndex:0] 
setFrame:firstFrame];
NSLog( @\tIs Now: %@ , 
NSStringFromRect([[[splitView subviews]
objectAtIndex:0] frame]) ) ;

[splitView adjustSubviews];
[nc 
postNotificationName:NSSplitViewDidResizeSubviewsNotification
object:splitView];
break;
default:
break;
}
[pool release] ;
}

NSLog( @Finally: %@ , NSStringFromRect([[[splitView subviews]
objectAtIndex:0] frame]) ) ;


(you might recognize this is as the Scrivener custom split view code
available on the web)

Anyway, the visual updates to the screen seem to start lagging the
further right I drag the handle. You can see the NSLog()s I have in
the code; here is the output as I drag:

[...]
2009-03-10 14:37:42.428 SkootUI[8830:10b] SetFrame: {{0, 0}, {718,  
604}}
2009-03-10 14:37:42.444 SkootUI[8830:10b] 	Is Now: {{0, 0}, {718,  
604}}
2009-03-10 14:37:42.511 SkootUI[8830:10b] SetFrame: {{0, 0}, {721,  
604}}
2009-03-10 14:37:42.539 SkootUI[8830:10b] 	Is Now: {{0, 0}, {721,  
604}}
2009-03-10 14:37:42.596 SkootUI[8830:10b] SetFrame: {{0, 0}, {723,  
604}}
2009-03-10 14:37:42.600 SkootUI[8830:10b] 	Is Now: {{0, 0}, {723,  
604}}
2009-03-10 14:37:44.101 SkootUI[8830:10b] Finally: {{0, 0}, {684,  
604}}


As you can see, as far as the view being resized is concerned, it is
being set to what I set it to as I drag the handle; i.e., the
SetFrame: dimensions match the Is Now: dimensions. During this
time, however, I can see the view sizing visually lag. When the drag
finishes and the Finally block prints out, querying the view for its
frame displays what I believe to be the actual lagged dimensions.

Can anyone tell me what's going on?

Thanks,

Mike
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Re: What is using up so much memory here?

[James Cicenia]

Yes, I realized I would need a different approach. I got too used to  
web gif/png and just doing overlays.
I have already told my designer to give me just bounded states with a  
spreadsheet of what he chopped
off from the top and left. This will then be inputted into the  
spreadsheet then into sqlite.


It should work a lot better.

Thanks again for your input.
James Cicenia

On Mar 10, 2009, at 7:28 PM, Graham Cox wrote:



On 11/03/2009, at 11:00 AM, James Cicenia wrote:

Well... easier said then done. How would one place irregular shapes  
of the state over the map itself?

Any combination of states with a color needs to appear.



Since you are in a much-more memory-constrained environment, you  
need to get smart. Naively loading everything isn't going to work,  
so you need to figure this out.


You have a map of the USA, I guess, and you can see part of it on  
screen at any one time (presumably scrolling to show different  
parts, or zooming in and out to show more or less). You can treat it  
as a bunch of tiled shapes, each having a bounding box. The bboxes  
will overlap a little in many places, but that's OK. All you need to  
do is build a data structure that associates the bboxes with the  
relevant images and graphics, then determine which bboxes intersect  
the visible screen area. For those that don't, you don't need to do  
anything. For those that do, you need to load the graphic elements,  
scale them as appropriate for your zoom (if need be - zoom is  
usually taken care of using the view's scale transform, but you may  
want to avoid caching a full-scale image if your zoom suggests you  
don't need it) and draw them. When you've done that, you can discard  
them again, or cache them for later.


That's the basic M.O. If dynamically loading these images like this  
is too slow, you can then consider a way to cache what you loaded in  
such a way that when you become memory constrained, you can examine  
the cache and discard parts of it that you can't see right now,  
again by testing which bboxes intersect the screen.


The same technique will work for zooming, because all you're doing  
is making the screen area that intersects your data smaller and  
bigger. If you cached a low-resolution graphic for a zoomed-out  
view, you can scale it while zooming is in progress to avoid an  
expensive re-load, then, if needed, reload a higher-res version at  
the end.


Unfortunately you'll have to figure a scheme for doing all of this  
out for yourself, there isn't anything built-in because the need to  
do this is not all that generalisable. It's not that hard though. I  
would suggest though that using an entire subview for each overlaid  
image is going to hurt badly in terms of performance, scalability  
and ease of implementation. Instead just devise your own data  
structure that can hold objects having a bounding box (which sets  
the spatial location) and a reference to the image(s) it needs. Then  
when you draw, ask your data structure to draw all the cells that  
intersect the drawing area. For those that haven't loaded their  
images, they should now do so, then draw as usual.


The overall data structure would have one object per state, but all  
it needs to maintain when not visible is the bbox. 50 rects is a far  
lower memory footprint than 50 full-sized images.


--Graham




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Re: Background Process?

[Daniel Richman]

Set your program as a User Agent with launchd on install (i.e., a login 
item). launchd will make sure your program is running when the user logs in.


Then, take a look at the NSTimer docs to implement the every-so-often 
part of it.


--Daniel Richman



Pierce Freeman wrote:

Hi everyone:

I am wondering how to create a background process that will only run when
the user is logged in and will run every certain minutes (a bit like Time
Machine).  I am also not sure in which way the action in the background
process would be programmed, so any information regarding this would be
great.


Thanks for any help.


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Re: setFrame: not working in custom event loop

[Mike Manzano]

Thanks, I will try that tomorrow. The code isn't mine, I'm just trying  
to use it with minimal change. If this doesn't fix it, I probably will  
just rewrite it to use the separate events.


Mike


On Mar 10, 2009, at 5:41 PM, Jesper Storm Bache wrote:

When you modify a window it registers itself as needing redrawing in  
the current run loop.

If you are performing active tracking, you may have to do so yourself.
Try calling [window flushWindowIfNeeded] on your window at the end  
of your loop (inside the loop).


What is the reason for your explicit tracking?
You should be able to simply listen for mouseDragged, mouseDown, and  
mouseUp on your split view (if this is a custom sub-class).

Jesper Storm Bache

On Mar 10, 2009, at 2:51 PM, Mike Manzano wrote:


Hi,

I am tracking the mouse pointer to dynamically resize a splitter as a
separate drag handle is dragged. This is done in mouseDown: of the
drag handle with a custom event loop. The loop looks like this:

  while (keepOn)
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
  theEvent = [[self window] nextEventMatchingMask:
NSAnyEventMask] ;// NSLeftMouseUpMask | NSLeftMouseDraggedMask];

  switch ([theEvent type])
{
case NSLeftMouseUp:
keepOn = NO;
break;

case NSLeftMouseDragged:
[nc  
postNotificationName:NSSplitViewWillResizeSubviewsNotification

object:splitView];
firstFrame = [[[splitView subviews] 
objectAtIndex:0] frame];
firstFrame.size.width = (isLeftResizer ?

 MAX(0,roundf(([splitViewconvertPoint:[theEvent
locationInWindow] fromView:nil].x + offset) - firstFrame.origin.x)) :

 MAX(0,roundf([splitViewconvertPoint:[theEvent
locationInWindow] fromView:nil].x - [splitViewdividerThickness] -
offset)));

firstFrame.size.width = 
MIN(MAX(firstFrame.size.width,min),max);

NSLog( @SetFrame: %@ , 
NSStringFromRect(firstFrame) ) ;
[[[splitView subviews] objectAtIndex:0] 
setFrame:firstFrame];
NSLog( @\tIs Now: %@ , 
NSStringFromRect([[[splitView subviews]
objectAtIndex:0] frame]) ) ;

[splitView adjustSubviews];
[nc 
postNotificationName:NSSplitViewDidResizeSubviewsNotification
object:splitView];
break;
default:
break;
}
[pool release] ;
}

NSLog( @Finally: %@ , NSStringFromRect([[[splitView subviews]
objectAtIndex:0] frame]) ) ;


(you might recognize this is as the Scrivener custom split view code
available on the web)

Anyway, the visual updates to the screen seem to start lagging the
further right I drag the handle. You can see the NSLog()s I have in
the code; here is the output as I drag:

[...]
2009-03-10 14:37:42.428 SkootUI[8830:10b] SetFrame: {{0, 0}, {718,  
604}}
2009-03-10 14:37:42.444 SkootUI[8830:10b] 	Is Now: {{0, 0}, {718,  
604}}
2009-03-10 14:37:42.511 SkootUI[8830:10b] SetFrame: {{0, 0}, {721,  
604}}
2009-03-10 14:37:42.539 SkootUI[8830:10b] 	Is Now: {{0, 0}, {721,  
604}}
2009-03-10 14:37:42.596 SkootUI[8830:10b] SetFrame: {{0, 0}, {723,  
604}}
2009-03-10 14:37:42.600 SkootUI[8830:10b] 	Is Now: {{0, 0}, {723,  
604}}
2009-03-10 14:37:44.101 SkootUI[8830:10b] Finally: {{0, 0}, {684,  
604}}


As you can see, as far as the view being resized is concerned, it is
being set to what I set it to as I drag the handle; i.e., the
SetFrame: dimensions match the Is Now: dimensions. During this
time, however, I can see the view sizing visually lag. When the drag
finishes and the Finally block prints out, querying the view for  
its

frame displays what I believe to be the actual lagged dimensions.

Can anyone tell me what's going on?

Thanks,

Mike
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Re: Background Process?

[Kyle Sluder]

On Tue, Mar 10, 2009 at 9:24 PM, Daniel Richman
applemaill...@mm.danielrichman.com wrote:
 Set your program as a User Agent with launchd on install (i.e., a login
 item). launchd will make sure your program is running when the user logs in.

launchd doesn't launch Login Items.  It does, however, launch per-user
agents, but these only work on 10.5.

 Then, take a look at the NSTimer docs to implement the every-so-often part
 of it.

This is a bad idea.  It will put unnecessary burden on the processor,
and therefore reduce battery life on mobile machines, by doing nothing
in the runloop until the timer fires.  It's just not an appropriate
use of the NSTimer functionality.

launchd already has the capability of launching tasks on a schedule
using the StartCalendarInterval plist key.  Just use it.

--Kyle Sluder
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Re: Background Process?

[Daniel Richman]

Thanks for correcting me.  I have a lot to learn about this.


Kyle Sluder wrote:

On Tue, Mar 10, 2009 at 9:24 PM, Daniel Richman
applemaill...@mm.danielrichman.com wrote:
  

Set your program as a User Agent with launchd on install (i.e., a login
item). launchd will make sure your program is running when the user logs in.



launchd doesn't launch Login Items.  It does, however, launch per-user
agents, but these only work on 10.5.

  

Then, take a look at the NSTimer docs to implement the every-so-often part
of it.



This is a bad idea.  It will put unnecessary burden on the processor,
and therefore reduce battery life on mobile machines, by doing nothing
in the runloop until the timer fires.  It's just not an appropriate
use of the NSTimer functionality.

launchd already has the capability of launching tasks on a schedule
using the StartCalendarInterval plist key.  Just use it.

--Kyle Sluder
  

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Re: Background Process?

[Roland King]

This is a bad idea.  It will put unnecessary burden on the processor,
and therefore reduce battery life on mobile machines, by doing nothing
in the runloop until the timer fires.  It's just not an appropriate
use of the NSTimer functionality.

launchd already has the capability of launching tasks on a schedule
using the StartCalendarInterval plist key.  Just use it.

--Kyle Sluder
 

Could you expand on that a bit please? My mental picture of the runloop 
has always been more like a select() which does nothing unless there is 
something to do. Not that I ever quite sorted out in my own mind how an 
NSTimer fits is something you can select() on. Does the runloop actually 
poll a whole lot even when it has nothing to do?

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Re: Background Process?

[Kyle Sluder]

On Tue, Mar 10, 2009 at 9:49 PM, Roland King r...@rols.org wrote:
 Could you expand on that a bit please? My mental picture of the runloop has
 always been more like a select() which does nothing unless there is
 something to do. Not that I ever quite sorted out in my own mind how an
 NSTimer fits is something you can select() on. Does the runloop actually
 poll a whole lot even when it has nothing to do?

While NSTimers are not normal input sources, the frameworks are free
to add any input source to the runloop that they wish.  And in order
for your timer to fire, you need to keep the runloop awake, using at
least a dummy input source.  See Timers in Timer Programming Topics
for Cocoa:

A timer is not a real-time mechanism; it fires only when one of the
run loop modes to which the timer has been added is running and able
to check if the timer’s firing time has passed.

http://developer.apple.com/documentation/Cocoa/Conceptual/Timers/Articles/timerConcepts.html#//apple_ref/doc/uid/2806

So your process will need to remain awake, which means that the
processor needs to be that much more active.

--Kyle Sluder
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Re: What is using up so much memory here?

[Ricky Sharp]

On Mar 10, 2009, at 8:13 PM, James Cicenia wrote:

Yes, I realized I would need a different approach. I got too used to  
web gif/png and just doing overlays.
I have already told my designer to give me just bounded states with  
a spreadsheet of what he chopped
off from the top and left. This will then be inputted into the  
spreadsheet then into sqlite.



Are these images of each state perhaps always a solid color?  If so, I  
would highly recommend creating paths for each state and just filling  
the path as needed.


Any zooming will also give you great results as you'd be scaling  
vector-based content and not bitmapped content.


___
Ricky A. Sharp mailto:rsh...@instantinteractive.com
Instant Interactive(tm)   http://www.instantinteractive.com



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Odd interaction of NSTrackingArea behaviour with drag and drop

[Luke Evans]

I have tracking areas set up in an NSTableView,similar to the Cocoa  
PhotoSearch sample app, and these have the  
NSTrackingEnabledDuringMouseDrag option set.  There may be various  
definitions of what mouse drag actually means, but the docs just  
indicate that this option should produce tracking events when the  
mouse is moved through a tracking area with buttons pressed (q.v.  
NSTrackingArea Class Reference, Constants).


By and large tracking areas are working well, though I've had one true  
work-around for some odd behaviour during autoscroll (per an earlier  
thread here).


Now though, I've come to implement drag and drop onto my table cells  
and have noticed immediately that things go pear-shaped with  
(seemingly) externally initiated drag and drop.
As an item (e.g. from the finder) is dragged across the tracking areas  
I get frequent but intermittently timed mouseEntered - mouseExited  
event pairs.  These are sent to the control even when no tracking area  
boundary is being crossed, for instance when the mouse is just dragged  
up and down a cell/single tracking area.


I have a test app that recreates the problem in what I consider a  
reasonably sterile environment..  This consists of an NSTableView that  
defines a single tracking area that covers the area of a single cell  
in the table.  Dragging an item over this cell, produces the same  
stuttering event-pair messages that I'm seeing in my main app - again  
with no tracking area boundary being crossed.


Are these conditions familiar to anyone?  Should I expect tracking  
areas to work for drags started in other apps?


Obviously, I'd be keen to learn if tracking areas aren't supposed to  
work in 'normally' in during drag/drop, or if there are considerations  
I may have overlooked regarding how to set them up or how to keep them  
happy alongside other messaging that is invariably happening (table  
datasource drag/drop messages etc.).  However, to the last point, my  
test app elides all extra flora and fauna besides setting up the  
tracking areas and writing out trace messages as mouseEntered/ 
mouseExited messages are received.  So, the problem also exists with  
no particular drop-target code implemented (i.e. just passing/no  
parking w.r.t. the tracking area).


-- lwe


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Re: Background Process?

[Chris Suter]

Hi Kyle,

On Wed, Mar 11, 2009 at 1:19 PM, Kyle Sluder kyle.slu...@gmail.com wrote:

 While NSTimers are not normal input sources, the frameworks are free
 to add any input source to the runloop that they wish.  And in order
 for your timer to fire, you need to keep the runloop awake, using at
 least a dummy input source.  See Timers in Timer Programming Topics
 for Cocoa:

Whilst the run loop has to have a regular input source in it, I don't
think it needs to be processing any events. It's my understanding that
timers will still fire even if nothing else is happening.

I think the documentation is merely pointing out that if you're doing
other work, such as what might be occurring in a normal application, a
timer might be delayed by a few ms or more.

Regards,

Chris
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Re: Background Process?

[Darren Minifie]

Can't somebody write a small app and and profile it to get a conclusive
answer?  I'd do it but I'm lazy.  I am interested in the outcome though.

On Tue, Mar 10, 2009 at 7:52 PM, Chris Suter csu...@sutes.co.uk wrote:

 Hi Kyle,

 On Wed, Mar 11, 2009 at 1:19 PM, Kyle Sluder kyle.slu...@gmail.com
 wrote:

  While NSTimers are not normal input sources, the frameworks are free
  to add any input source to the runloop that they wish.  And in order
  for your timer to fire, you need to keep the runloop awake, using at
  least a dummy input source.  See Timers in Timer Programming Topics
  for Cocoa:

 Whilst the run loop has to have a regular input source in it, I don't
 think it needs to be processing any events. It's my understanding that
 timers will still fire even if nothing else is happening.

 I think the documentation is merely pointing out that if you're doing
 other work, such as what might be occurring in a normal application, a
 timer might be delayed by a few ms or more.

 Regards,

 Chris
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-- 
Darren Minifie
Graduate Studies: Computer Science
www.myavalon.ca
www.ohsnapmusic.com
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Re: Background Process?

[Chris Suter]

Hi Darren,

On Wed, Mar 11, 2009 at 2:28 PM, Darren Minifie minof...@gmail.com wrote:
 Can't somebody write a small app and and profile it to get a conclusive
 answer?  I'd do it but I'm lazy.  I am interested in the outcome though.

Well, I did do that and ran it under Shark: zero CPU usage. I also ran
another test and set a breakpoint in CoreFoundation's runloop code. It
only seemed to wake when the timer fired. My test might be flawed
though.

Regards,

Chris
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Re: Garbage collected and non-garbage collected

[Michael Ash]

On Tue, Mar 10, 2009 at 2:47 PM, Robert Mullen robe...@autowc.com wrote:
 Too little resource, too little experience, too little return. The first two
 are because this is a skunk works type corporate project that basically has
 myself (an ex-.NET and general Windows coder) as it's resource so is
 constrained by me. The third is because I don't see sufficient gain to doing
 all the memory management myself. GC systems have become efficient enough in
 our modern world that I think manual memory management has become pretty
 specialized and out of place in 80% of desktop applications. Certainly there
 is the other 20% of high performance and real time situations but mine is
 basically a pretty face on a database. Anybody want to argue the other
 direction? I am always willing to learn.

IMO you're right but also asking the wrong question.

You shouldn't be asking whether GC is worthwhile for desktop apps, but
whether *Cocoa's* GC is. They are not, unfortunately, the same
question. While Cocoa's GC is quite good given the constraints it
lives in, those constraints cause many unfortunate problems which
don't exist in other collectors. Some are in the collector itself
(don't take the address of a global pointer-to-object variable if you
don't like to crash), and some are in the frameworks (NSData has
hidden gotchas, NSInvocation doesn't keep strong references to message
arguments, and many other weird problems). Apple did a good job with
the GC given the constraints they were under (adding GC to a C runtime
environment is Not Easy) but there are still quite a few shortcomings
there.

You may still be right that going with GC and fixing this stuff up is
the best use of your time. I won't argue with that. I just wanted to
point out that it's not as simple as saying modern GCs are good
enough for the job now since the GC you have isn't exactly the GC
you'd have in a more managed environment.

Mike
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Re: Background Process?

[Michael Ash]

On Tue, Mar 10, 2009 at 11:28 PM, Darren Minifie minof...@gmail.com wrote:
 Can't somebody write a small app and and profile it to get a conclusive
 answer?  I'd do it but I'm lazy.  I am interested in the outcome though.

Just run Activity Monitor and look at one of the numerous idling GUI
apps. Notice how it uses 0% CPU.

The notion that adding a timer to a runloop would somehow cause that
runloop to suck up CPU time when the runloop is idle is nonsensical.
The whole point of the runloop is that it sleeps the process until
some activity is required. A background process sitting on a timer
*will* take up various resources (memory, file descriptors, kernel
structures, etc.) but CPU time is not among them.

Mike
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Re: Odd interaction of NSTrackingArea behaviour with drag and drop

[Luke Evans]

For the curious, the test app is available at:
http://idisk.mac.com/luke_e-Public/TrackingTesterDragDrop.zip
(61.2 KB)

On 10-Mar-09, at 7:41 PM, Luke Evans wrote:
I have a test app that recreates the problem in what I consider a  
reasonably sterile environment..


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Fwd: Problem in save and open on Core Data Document Based application

[haresh vavdiya]

-- Forwarded message --
From: haresh vavdiya vavdiyahar...@gmail.com
Date: Tue, Mar 10, 2009 at 4:50 PM
Subject: Re: Problem in save and open on Core Data Document Based
application
To: Volker in Lists volker_li...@ecoobs.de


Hi Volker,

 Thanks Volker,

 Ya u r right, i opened from File - Open and it works,,...please
tell me that what should i dowhen i directly click on application.

 Can we use MySql for storing data instead of Core Data.

Thanks,
Haresh.

On Tue, Mar 10, 2009 at 4:23 PM, Volker in Lists volker_li...@ecoobs.dewrote:

 Hi,

 the message says that the data model in the file you try to open is
 different than the one you have in your app. As far as I can follow you,
 both apps use the same file type and the former is always trying to open the
 others file. Of ocurse, then it complains about the different model. Have
 you tried opening Departments file via Departments - File - Open ? That
 should work. If not, you have made changes to your model after saving the
 document.

 On a side note: CoreData should not be learned by the beginner. First, try
 to understand the basics, than move slowly, very slowly up to CoreData,
 otherwise you'll be lost soon. If you're not content with the content you
 find via Apple's developer resources on Core Data, there is a very good book
 written by Markus Zarra - available as preliminary version from Pragmatic
 Programmers.

 Cheers,
 Volker


 Am 10.03.2009 um 11:39 schrieb haresh vavdiya:

  Hello,

 I am learning mac development from Aaron Hillegas 3rd Edition.
 i have created two Example CarLot and Departments  based on Core -Data
 document based application.

 When i created CarLot example that time it can save and open
 data without writing single line. Then i created Departments example so it
 should also save and open.

 But second example save successfully but when open, it gives
 error. But in dock panel, CarLot apps is launched. i can open this apps
 from
 dock. But i wanted to save and open Departments example.

   I can't understand that i saved apps from Deparetment and it
 launch CarLot example in dock. Is there in problemwhat is the
 problem..i m trying from long time.

And the message is The document “DeptTest” could not be
 opened. The model configuration used to open the store is incompatible
 with
 the one that was used to create the store.

  Please anyone help to figure out this problem.

 Thanks,
 Haresh.
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Examples or Documentation for Non-document-based Multi-window App

[Grant Erickson]

Suppose I were writing an application, perhaps similar to the example at
http://en.wikibooks.org/wiki/Programming_Mac_OS_X_with_Cocoa_for_beginners/B
uilding_a_GUI (or many of the examples in /Developer/Examples/...) that had
no file-based interaction whatsoever but for which I wanted to allow the
user to open up and interact with up to N windows.

Using the example above, each newly-opened window perhaps displays something
from quote of the day (QOTD) or some other singular random data source
rather than Hello World.

It seems the document-based architecture is ill-suited to such an
application because there is effectively no need to open, save, revert,
print, etc. anything.

Does anyone have any recommendation for examples, URLs or books that might
discuss and illustrate such an application or the rough framework thereto?

Thanks,

Grant


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Cant figure out images

[Etienne Gignac Bouchard]

Hi guys.

So I tried NSImage without much success and now I¹m trying CIImage.  I have
the following code:

NSURL *testUrl;

testUrl = [NSURL URLWithString:@/Users/Etienne/Desktop/logo.gif];
CIImage *imageTest;


if(testUrl == nil)
NSLog(@TEST NIL !);
else
NSLog(@TEST : %@, testUrl); // PRINT THE URL

imageTest = [[NSImage alloc] initWithContentsOfURL:testUrl];

if(imageTest == nil)
NSLog(@Init image with URL failed); // -- I GET THAT
else
NSLog(@image init ok\n);

So my image is always nil...this seems like pretty simple code to me.  What
am I missing.  Oh yeah and the file really is on my desktop...

Thank for your help !

Etienne
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EXC_BAD_ACCESS on NSImageView::setImage

[Dev]

I have a window that contains a NSImageView that displays pictures.

here is the code :
=CODE=
NSBitmapImageRep *rawPic = [[[NSBitmapImageRep alloc]
initWithBitmapDataPlanes:NULL
pixelsWide:thisFrame.width pixelsHigh:thisFrame.height
bitsPerSample:8 samplesPerPixel:3 hasAlpha:NO isPlanar:NO
colorSpaceName:NSCalibratedRGBColorSpace
bitmapFormat:NSAlphaFirstBitmapFormat
bytesPerRow:0
bitsPerPixel:0] autorelease];
unsigned char *DestinationRawData = [rawPic bitmapData];
memcpy(DestinationRawData, CurrentFrame, SzCurrentFrame);
[self RGB2BGR:DestinationRawData Sz:SzCurrentFrame];

NSImage *NewDisplayImage = [[[NSImage alloc] initWithSize:thisFrame]
autorelease];
[NewDisplayImage addRepresentation:rawPic];
[ExternalView setImage:NewDisplayImage];
=CODE=

The ExternalView display correctly what i want for a while, no memory leak
appears but
after few seconds the program gives me a bad EXC_BAD_ACCESS.

After commenting the last line (setImage) there is absolutely no crash.
Thinking of a side-effect i checked all sizes and everything seams to
fit.

I also tried to remove the autorelease and replace them by some release
after
the set image but nothing seams to work.

Can anybody see something wrong ?

Is there any other way to do what i m doing ?

Thanks for the peolple that will help me.
Sincerely,
-- 
I.
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Re: Cant figure out images

[Nick Zitzmann]

On Mar 10, 2009, at 6:45 PM, Etienne Gignac Bouchard wrote:


   testUrl = [NSURL URLWithString:@/Users/Etienne/Desktop/logo.gif];



That's not a URL; that's a POSIX path. If you want a file URL, then  
use +fileURLWithPath: instead.


Nick Zitzmann
http://www.chronosnet.com/



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Re: Background Process?

[Kyle Sluder]

On Tue, Mar 10, 2009 at 11:38 PM, Michael Ash michael@gmail.com wrote:
 The notion that adding a timer to a runloop would somehow cause that
 runloop to suck up CPU time when the runloop is idle is nonsensical.
 The whole point of the runloop is that it sleeps the process until
 some activity is required. A background process sitting on a timer
 *will* take up various resources (memory, file descriptors, kernel
 structures, etc.) but CPU time is not among them.

That's not what I said.  What I said was that you cannot add a timer
to your runloop and expect it to sit blocking on it until the timer
fires.  That's not how timers operate.  You will need to periodically
run the runloop in order to get your timer to fire.  If you are doing
this in an application, then the event-processing functionality of the
runloop will take care of it.  Otherwise, you will need to run it
yourself.  Either way, you will need to periodically poke the runloop,
which on it's face can't take 0.0% CPU.  Your app will persistently
wake up (and our friend Nyquist has proven that in order for this to
work it must wake at least twice as often as you want the timer to
fire).

--Kyle Sluder
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Re: KVO Bindings: Proxy object change notifications

[Ken Thomases]

On Mar 10, 2009, at 4:14 AM, Dave Keck wrote:


I have a preferences controller object (let's call it PrefCtrl) that's
modeled after NSUserDefaultsController (for various reasons, though,
it's a custom implementation.) As does NSUDC, it has a 'values'
property, which mediates access to the preferences. The bindings in
the UI use this 'values' proxy object to access the preferences. The
role of the proxy object is simple: it forwards KVC methods
(-valueForUndefinedKey: and setValue:forUndefinedKey:) to PrefCtrl,
which either supplies or sets the appropriate value.

[...]

The problem arises
when I have 3+ elements in the binding key path. For example, if the
button's enabled property is bound to PrefCtrl's
values.someFeature.isEnabled. In this case, when the value of
'values.someFeature.isEnabled' changes (let's assume due to another
process re-writing the preferences) is when hell breaks loose and I
get this delightful message:

Cannot remove an observer NSKeyValueObservance 0x137d50 for the key
path someFeature.isEnabled from PrefCtrl_Proxy 0x135bd0, most
likely because the value for the key someFeature has changed without
an appropriate KVO notification being sent. Check the KVO-compliance
of the PrefCtrl_Proxy class.


Are you sure that PrefCtrl is returning the same proxy each time?

Also, at the time that you invoke -willChangeValueForKey: have you  
already changed your internal state such that invoking [theProxy  
valueForKey:@someFeature] returns the after value?  It should  
still return the before value at that point.  It must not return the  
after value until after the -willChangeValueForKey: call completes.




My question: Of course, this error is correct - the value for the
'someFeature' key DID change. But why wasn't sending
willChange/didChangeValueForKey: @values enough to notify the KVO
system that values.someFeature was also going to change?


It is enough.  However, KVO has to unwind the set of observations on  
individual objects it did along the key path.  In order to do that, it  
has to invoke -valueForKey: on the first object to get the second, on  
the second to get the third, etc.  If any of those doesn't give back  
the same object it did when the original observation was established,  
then it can't unwind what it did.


That's what it's complaining about.  It's saying that [theProxy  
valueForKey:@someFeature] isn't the same object it was when the  
observation was established, so KVO can't unhook itself from the  
object it had earlier hooked into.  Note that it's attempting this  
unwinding during -willChangeValueForKey:.  Of course, that object  
won't be the same _after_ -willChangeValueForKey: -- you are, after  
all, changing it -- but it needs it to be the same _at_ - 
willChangeValueForKey: for KVO's housekeeping to work.


Also, since KVO was watching the someFeature property of the proxy,  
and that property is different than it was, but KVO never noticed that  
it changed, it's reporting that the property changed in a non-KVO- 
compliant fashion.  Since you are using a proxy to front for your  
PrefCtrl, are you also making sure that all changes of PrefCtrl's  
properties cause change notifications for the proxy's virtual  
properties?  That is, are you forwarding all -will/didChange...  
invocations on your PrefCtrl object to your proxy, at least for keys  
other than values?


You may be able to eliminate the proxy altogether, by the way.  Have  
you tried having the values property of the PrefCtrl object just  
return self -- the PrefCtrl object itself?  That would avoid the  
need to forward things in either direction, but still give you the  
ability to will/didChange... the values property to provoke a  
wholesale updating of all observers of any properties.  At least, I  
think that should work.


Regards,
Ken

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Re: Background Process?

[Roland King]

Kyle Sluder wrote:


On Tue, Mar 10, 2009 at 11:38 PM, Michael Ash michael@gmail.com wrote:
 


The notion that adding a timer to a runloop would somehow cause that
runloop to suck up CPU time when the runloop is idle is nonsensical.
The whole point of the runloop is that it sleeps the process until
some activity is required. A background process sitting on a timer
*will* take up various resources (memory, file descriptors, kernel
structures, etc.) but CPU time is not among them.
   



That's not what I said.  What I said was that you cannot add a timer
to your runloop and expect it to sit blocking on it until the timer
fires.  That's not how timers operate.  You will need to periodically
run the runloop in order to get your timer to fire.  If you are doing
this in an application, then the event-processing functionality of the
runloop will take care of it.  Otherwise, you will need to run it
yourself.  Either way, you will need to periodically poke the runloop,
which on it's face can't take 0.0% CPU.  Your app will persistently
wake up (and our friend Nyquist has proven that in order for this to
work it must wake at least twice as often as you want the timer to
fire).

--Kyle Sluder
 

This isn't how I understood the runloop documentation when I read it, 
and it's more than possible I have totally misread it. In the runloop 
documentation it says that at step '7'


*Put the thread to sleep until one of the following events occurs:

   An event arrives for a port-based input source
   A timer fires
   The timeout value set for the runloop expires
   The runloop is explicitly woken up.*

So you just add the timer to the runloop, run it, it sleeps until the 
timer fires, does its thing and then goes back to sleep again. What am I 
missing?



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Re: Remote Invocation

[Ken Thomases]

On Mar 10, 2009, at 9:13 AM, rajesh swarnkar wrote:


  I have two application in cocoa . My aim is to communicate with a
protocol between both the application using IPC mechanism (through
NSConnection) but I am unable to achieve my goal.

I want to use id  MyProtocol  protocol as inout parameter for two  
way

communication.
  Please see my code below and guide me what I am missing.


You haven't said what's not working or is going wrong.

At a glance, I can say that your initializer methods are all wrong.   
You aren't invoking the superclass's initializer.


If you want a minimal -init method, you should just not provide any  
and rely entirely on your superclass's implementation.  If you still  
want to provide it, anyway, here's the form:


-(id)init { return [super init]; }

Similarly, if you're just going to provide a minimal -dealloc method,  
you might as well just leave it out, although yours do look correct.


Fix those issues and ask a proper question and you may get better help.

Regards,
Ken

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