On May 27, 2009, at 6:59 AM, Ignacio Enriquez wrote:
Hi.
I have a basic question regarding Class methods and instance methods
and memory allocation. (this is in iPhone OS 3.0 beta 5)
1.- What is the difference between string1 and string2? where
NSString *string1 = [NSString stringWithFormat:@"myFirstString"];
NSString *string2 = [[NSString alloc]
initWithFormat:@"mySecondString"];
I thought that string1's memory allocation and release would be done
by the system (autoreleased) and string2's memory and release should
be done by me (by [string2 release])
Am i mistaking?
You are correct.
A funny thing is when doing:
NSLog(@"retainCount %i %i", [string1 retainCoung], [string2
retainCount]);
I got :
"retainCount 2147483647 2147483647"
So It seems that both objects are autorelease objects... Why is that?
I thougth that string2 retainCount would be 1.
This kind of refcount indicates a "real const" string. You are likely
to see a different ref-count if you create a mutable string.
2.- How can I get two simple NSString instances with a retainCount
equal to 1
In general don't worry about the exact ref-count values, but rather on
making sure that you follow the Cocoa memory rules.
The Leaks tool can assist in finding areas where you forgot to release
objects. And the zombie mechanism can be used to track down over
releases.
(since you are on the iPhone garbage collection is not an option).
Jesper Storm Bache
Core Technologies
Adobe Systems Inc
Any response would be very appreciated.
Regards
Ignacio
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