Re: Garbage Collection and NSNetService

FROM : Jon Hess
DATE : Sun Nov 11 18:52:45 2007

Hey August -

NIB loading leaves a retain of +1 on all top level NIB objects. That's 
what is keeping your object alive without GC. With GC, that retain is 
a no-op. In order to keep your object alive you'll need to do 
something like reference it from another live object, reference it 
from a global, or CFRetain/CFRelease it.

Good Luck -
Jon Hess

On Nov 11, 2007, at 8:37 AM, August Trometer <<email_removed>> wrote:

> Hello!
>
> I'm trying to wrap my head around Garbage Collection, but I'm 
> baffled by the behavior of some of my objects. For example, I am 
> trying to publish a Bon Jour service. I have an object that does 
> this, BJController. It is instantiated within the Nib and the 
> service is published during awakeFromNib
>
> In my .h file, I have:
>
> @property (retain) NSNetService *service;
>
> and in the .m file:
>
> @synthesize service;
>
>
> When I publish the service I use:
>
>
> self.service = [[NSNetService alloc] initWithDomain:@"" 
> type:@"_BJTest._tcp" name:@"Just a Test" port:5260];
>
> [self.service setDelegate:self];
> [self.service publish];
>
>
> Now, as long as I keep Garbage Collection turned off, this works 
> fine. When I turn it on, however, the service object seems to 
> evaporate before the service is published, and my NSNetService 
> delegate methods never get called at all.
>
> I've been through the GC docs, and I'm assuming it's got something 
> to do with a weak reference somewhere. But I can't seem to figure 
> out where that would be.
>
> Any ideas?
>
> Thanks!
>
> August
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