ABMultiValueCopyValueAtIndex allow release twice?

Question

ABMultiValueRef phones = ABRecordCopyValue(ref, kABPersonPhoneProperty);
if ( phones ) {
    for(int i=0;i<ABMultiValueGetCount(phones);i++) {
        NSString* label=(NSString*)ABMultiValueCopyLabelAtIndex(phones, i);
        CFRelease ((CFTypeRef)label);
        CFRelease ((CFTypeRef)label);
    }
}
CFRelease(phones);

Why label can be released twice without any error? but phones cannot. Any memory leak if not release label for twice?

I had run above code successfully in xcode4 simulator 4.3

try doing this NSLog ([NSString stringWithFormat:@"Label retainCount : %d", [label retainCount]]); after you do CFRelease and see what shows up in your debugger — SayeedHussain, May 17 '11 at 15:11
The label retainCount is: 2 => 1 => 1 The phones retainCount is: 2 => 1 — m841lr, May 18 '11 at 02:20
ABAddressBookRef from ABAddressBookCreate() return retainCount is: 1. CFArrayRef from ABAddressBookCopyArrayOfAllPeople() return retainCount is: 1. ABRecordRef from CFArrayGetValueAtIndex() return retainCount is: 2. Any idea? — m841lr, May 18 '11 at 03:00

score 0 · Answer 1 · answered Mar 06 '12 at 00:22

It doesn't matter why this doesn't crash. You absolutely shouldn't be doing it. The contract this function has with you is it returns a value which you must release exactly once. Whatever else it does with this value internally (e.g. caching) that may cause this to not crash is irrelevant.

ABMultiValueCopyValueAtIndex allow release twice?

1 Answers1