Memory leak in simple code?
Memory leak in simple code?
- Subject: Memory leak in simple code?
- From: Jason von Nieda <email@hidden>
- Date: Wed, 06 Apr 2005 23:45:07 -0500
Hi all, my first post to the list, so be gentle please :)
I have a Cocoa application I wrote a while back to learn the framework
and I am now trying to clean it up for distribution. It's leaking memory
and I have narrowed the leak down to one line, but I can't figure out
why it's leaking.
The line is in a function being called by a NSTimer every 3 seconds, and
ObjectAlloc is showing that I am leaking 12 NSStrings every 3 seconds.
Below is the code with some notes in comments. I'd appreciate if someone
can give me a helping hand :)
// The timer function, called every 3 seconds from an NSTimer
// This function is normally much longer, but I've commented everything
else out (and even removed it from the source) in the process of finding
which line was causing the leak
- (void)getAudioTronStatus:(NSTimer *) timer
{
NSString *url = [NSString
stringWithFormat:@"http://admin:%@@%@:%d/apigetstatus.asp";,
configPassword, configHostname, configPortNumber];
url = [url
stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
NSURL *nsURL = [NSURL URLWithString:url];
// !!!!!!!
// The next line is the one causing the leak. If I comment it out
the program does not leak and if I try to
// release or autorelease "results" the program crashes.
NSString *results = [NSString stringWithContentsOfURL:nsURL];
//NSLog(@"%@", results);
}
// this is the line in awakeFromNib that starts the timer
[NSTimer scheduledTimerWithTimeInterval:3.0 target:self
selector:@selector(getAudioTronStatus:) userInfo:nil repeats:YES];
My understanding of Cocoa memory management in ObjC is that any object I
don't specifically call alloc or retain on should be autoreleased when
it goes out of scope. So I feel like "results" should be autoreleased at
the end of the function.
Thanks,
Jason von Nieda
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