Re: Debugging: do CFZombieLevel and objc_exception_throw() work for you?

FROM : Sean McBride
DATE : Tue Jul 11 23:09:04 2006

On 2006-07-11 13:23, Scott Ellsworth said:

>>> I tried the same thing with an NSString, and with CFZombieLevel 
>>> (1, 19, 5, and a few other values based on the tech note), and all 
>>> I got were bad access exceptions.
>>>
>>>     NSString * string = [[NSString alloc] initWithFormat:@"String %
>>> d", 12];
>>>     [string release];
>>>     [string length];
>>>
>>> Should I have expected this?

>>
>> Yes. Class cluster objects toll-free bridged to CoreFoundation 
>> structures are never zombified; even with NSZombieEnabled set they 
>> will always be released.

>
>Huh - I had misunderstood <http://developer.apple.com/technotes/

>tn2004/tn2124.html>, then.  It implied to me that CFZombieLevel would 
>have caught misbehaviors in CF objects, even if they were toll free 
>bridged.  Of course, it contains little enough text that I was 
>reading a bit more into it than strictly implied.


I have confirmed that CFZombieLevel at least works as expected with
CFStrings.  Consider:

   CFStringRef        str = CFStringCreateWithFormat(0,0,CFSTR("hello"));
   CFShow(str);
   CFRelease(str);
   CFShow(str);

This prints "hello" twice for me, but crashes with CFZombieLevel=65553.

So many types are toll-free bridged, it sucks that neither NS or CF
zombie works with them. :(

--
____________________________________________________________
Sean McBride, B. Eng                <email_removed>
Rogue Research                        www.rogue-research.com
Mac Software Developer              Montréal, Québec, Canada