Re: confused about allocating and releasing objects
Re: confused about allocating and releasing objects
- Subject: Re: confused about allocating and releasing objects
- From: "Jonathan del Strother" <email@hidden>
- Date: Wed, 27 Aug 2008 12:22:57 +0100
On Wed, Aug 27, 2008 at 12:13 PM, Memo Akten <email@hidden> wrote:
> ok thanks, I"ve added that link to my ever growing Cocoa bookmarks!!
> I'm just writing a Quartz Composer plugin using the QCPlugIn API and ran
> into a problem regarding this, my question isn't related to the QCPlugIn API
> so I'm posting here first.
> At the start of the plugin (in enableExecution) I use the code:
> - (void) loadCardXMLData {
> NSString *dataPath = @"/data.plist";
> cardsLoadedData = [NSDictionary dictionaryWithContentsOfFile: dataPath];
> // cardsLoadedData = [[NSDictionary alloc] initWithContentsOfFile:
> dataPath];
> if(cardsLoadedData) {
> NSLog(@"*** SUCCESSFULLY LOADED %@", dataPath);
> } else {
> NSLog(@"*** COULD NOT LOAD %@", dataPath);
> }
> }
> If I use the convenience route (with no release in disableExecution) I get a
> freeze (I need to force quit QC) as soon as I enable the plugin. If I use
> the alloc route (and release in disableExecution) everything works fine. Is
> this normal behaviour? or could it be QC related?
> P.S. cardsLoadedData is a property of my QCPlugIn class, and I don't use it
> at all except at the end of execute I just send it out to QC
> with self.outputXMLData = cardsLoadedData;
> Cheers,
> Memo.
>
You're assigning an autoreleased object to your cardsLoadedData ivar.
Next time the autorelease pool pops, your dictionary is going to get
released. Either retain the dictionary, or use alloc+init, or
(preferably) use self.cardsLoadedData= instead of just
cardsLoadedData=, which will assign via the property method, which
will retain for you (assuming you've set up the property correctly).
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