Printing Instance ID to NSLog?

objective-c memory nslog dealloc
fuzzygoat picture fuzzygoat · Sep 9, 2009 · Viewed 19.4k times · Source

In the dealloc method for a class how would I print out the ID (or some other unique identifier) for the instance being deallocated? 

- (void)dealloc {
    NSLog(@"_deallocing: ??");
    [super dealloc];
}

Is this possible? I am just trying to get a little more feedback in the console as an aid to learning.

many thanks -gary-

Answer

dmkash picture dmkash · May 27, 2010

If you specifically want the memory address of the object (which I suppose could be considered an "identifier" if you don't have one implemented in your class), you can use this:

NSLog(@"deallocing %p", self);

This can be rather helpful if you have more than one instance of a particular class and are trying to determine which is getting dealloc'd when.

Related questions

Programmatically retrieve memory usage on iPhone

I'm trying to retrieve the amount of memory my iPhone app is using at anytime, programmatically. Yes I'm aware about ObjectAlloc/Leaks. I'm not interested in those, only to know if it's possible to write some code and get the …

Read More
Understanding reference counting with Cocoa and Objective-C

I'm just beginning to have a look at Objective-C and Cocoa with a view to playing with the iPhone SDK. I'm reasonably comfortable with C's malloc and free concept, but Cocoa's references counting scheme has me rather confused. I'm told …

Read More
UIGraphicsGetImageFromCurrentImageContext memory leak with previews

I'm trying to create previews images of pages in a PDF but I have some problems with the release of memory. I wrote a simple test algorithm that cycles on the problem, the app crashes near the 40th iteration: NSArray *…

Read More