You're not initing the NSMutableArray. You're using a convenience
constructor, and it's returning an autoreleased object. What's
probably happening is that the autoreleased object is getting
deallocated via a popped autorelease pool. Try changing the line to be:
boxes = [[NSMutableArray alloc] initWithCapacity:NUM_BOXES];
This is a really important topic that will give you a lot of grief if
you don't understand what's going on.
Also, you're leaking all your Box objects inside the for() loop,
because you init them (retain count of +1), and put them into an array
(retain count of +2), but you're not releasing the Box after adding it
to the array (which is what you'd want to do 99.9% of the time).
Given that both the problems seem to be memory related, I suggest that
you take the time to study this document until you find yourself
reciting memory management rules in you sleep. =) http://developer.apple.com/documentation/cocoa/conceptual/memorymgmt/MemoryMgmt.html
There are also a *ton* of websites out there that will explain this:
http://lmgtfy.com/?q=cocoa+memory+management
Cheers!
Dave DeLong
On Jun 12, 2009, at 7:17 AM, Allan Greenier wrote:
This is so simple I know the answer will embarrass me.
This is an iPhone app.
I've got an NSMutable array declared in my EAGLview.h file
NSMutableArray *boxes;
I init and fill it in the EAGLview's initWithCoder method
boxes = [NSMutableArray arrayWithCapacity:NUM_BOXES];
for(i = 0; i < NUM_BOXES; i++)
{
Box *abox = [[Box alloc] init];
[boxes addObject: abox];
}
In EAGLview dealloc I
boxes = nil;
Later on in program flow, in EAGLview, if I try to access boxes in
anyway, I crash into the debugger
[boxes objectAtIndex: 0];
or even
NSLog(@"mode5 boxes %@", boxes);
will crash
What am I missing? What's wrong with my NSMutableArray?
My only guess is it's in my for loop, I need to release abox?
Thanks,
Allan
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