Help with these memory leaks

[thh022]

I got three memory leaks I can't figure out. These leaks I found by using Instruments > Leaks.

Leak 1: This leak I have no idea what is or what causes it.

#import <UIKit/UIKit.h>

int main(int argc, char *argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    int retVal = UIApplicationMain(argc, argv, nil, nil); // LEAK
    [pool release];
    return retVal;
}

Leak 2: Here I make some objects (NSMutableDictionary) and put them in the elements array. I release the array elements in dealloc.

NSMutableArray *elements;
NSMutableDictionary *item;
...
[elements addObject:[item copy]]; // LEAK
[item release];

Leak 3: Here the first and third lines comes up as a leak. In the dealloc-function I release the parser and set's it delegate = nil.

parser = [[NSXMLParser alloc] initWithContentsOfURL:[NSURL URLWithString:@"http://www.rabaldus.no/apps/..."]]; // LEAK
[parser setDelegate:self];
[parser parse]; // LEAK

Maybe I need to submit more code, but hopes this is enough for a start to figure out the leaks.

[dany_dev]

Leak1: the leak is not here, that is the autorelease pool
Leak2: you don't need to use copy
Leak3: you should release parse...since that you use alloc\init

[harrytheshark]

You never keep a pointer to the object returned when you copy item, so it leaks.

When you copy it, you get a +1 retain count on the new object, you then add it to the array so it gets retained again. You're now at +2.

You need to do something like:

id copy = [item copy];
[elements addObject:copy];
[copy release];

[thh022]

Leak 1: I am not sure what this is. I can't find any class named main.m.

Leak 2: Code changed and noe more leaks:

[elements addObject:item copy];

Leak 3: Now I release the parser, but still the to lines is leaking:

parser = [[NSXMLParser alloc] initWithContentsOfURL:[NSURL URLWithString:@"http://www.rabaldus.no/apps/..."]]; // LEAK
[parser setDelegate:self];
[parser parse]; // LEAK
[parser release];

[thh022]

Leak 3:

I found a solution on the web:

Original code:

parser = [[NSXMLParser alloc] initWithContentsOfURL:[NSURL URLWithString:@"http://www.rabaldus.no/apps/***.php"]];

Updated code with no leaks:

NSData *dataXml = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:@"http://www.rabaldus.no/apps/***.php"]];
parser = [[NSXMLParser alloc] initWithData:dataXml];
[dataXml release];

As a newbie I can´t see the difference between the two ways, but the leak is gone.

Maybe someone can explain it?

[mavrik5150]

For the first leak trying running the Zombie Instrument instead of the Leak. It should show you what item is being either being released twice, or not released and therefore causing an issue when another item is trying to allocate that same memory space. I had this problem two and the Zombie instrument showed me the exact item that was causing the Zombie and I was able to fix it from there.