Memory management question
Memory management question
- Subject: Memory management question
- From: Philippe Martin <email@hidden>
- Date: Mon, 29 Apr 2002 18:49:12 +0200
Hi,
I'm quite new at Cocoa, and I guess I have some troubles to understand when a new instance of an object or of a variable is created and when an existing instance is reused. For example, I came up with a method that went something like this:
-( void )doSomeThing {
int i;
NSArray *myArray;
for ( i = 0; i < [ anotherArray count ]; i++ ) {
myArray = [ [ NSArray alloc ] init ];
myArray = [ [ anotherArray objectAtIndex:i ]
componentsSeparatedByString:@"\t" ];
// do something here
[ myArray release ];
myArray = nil;
}
}
}
This crashed my application with an "EXC_BAD_ACCESS" signal. Not in this method, but shortly after having exited from it (the method was doing its job). When I commented out "[ myArray release ]" the crash was gone, but then I assumed the application was leaking.
I fixed it by making myArray "autoreleased", with something like this:
-( void )doSomeThing {
int i;
for ( i = 0; i < [ anotherArray count ]; i++ ) {
NSArray *myArray = [ [ anotherArray objectAtIndex:i ]
componentsSeparatedByString:@"\t" ];
// do something here
}
}
}
But I'd really like to understand why the first way was failing. I originally allocated and released myArray manually because the process may be intensive and I thought it was better to release the objects between each loop rather than only at the end. Obviously I didn't keep the count right, but I can't see where I've been lost. Help, please?
Thanks in advance!
Philippe
--
______________________________________________________________________
Philippe MARTIN (a.k.a. Flip)
mailto:email@hidden
http://www.MacrobyteResources.com http://www.Free-Conversant.com
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