Re: Get list of possible applications
Re: Get list of possible applications
- Subject: Re: Get list of possible applications
- From: Daniel <email@hidden>
- Date: Sun, 20 Apr 2008 18:49:31 +0200
Hi,
thank you very much for your help, I was searching exactly that!
Best regards,
Daniel
On Sun, Apr 20, 2008 at 5:15 PM, Gerd Knops <email@hidden> wrote:
>
> On Apr 19, 2008, at 11:33 PM, Chris Hanson wrote:
>
> > On Apr 19, 2008, at 9:55 AM, Gerd Knops wrote:
> >
> > > This returns an array with URLs of applicable applications for a file of
> a given URL:
> > >
> > > - (NSArray *)applicationsForURL:(NSURL *)url {
> > >
> > > return (NSArray
> *)LSCopyApplicationURLsForURL((CFURLRef)url,kLSRolesAll);
> > > }
> > >
> >
> > It also leaks -- even if you're running under Objective-C garbage
> collection -- because LSCopyApplicationURLsForURL has "copy" in its name and
> therefore follows the Core Foundation "copy" rule.
> >
> >
> Sorry, careless copying from a larger context and failure to proof read...
> Of course Chris is right.
>
> Gerd
>
>
>
>
>
> > The proper form for the above method, if you aren't using Objective-C
> garbage collection, is:
> >
> > - (NSArray *)applicationsForURL:(NSURL *)url {
> > return [(NSArray *)LSCopyApplicationURLsForURL((CFURLRef)url,
> kLSRolesAll) autorelease];
> > }
> >
> > This ensures that the returned NSArray will be autoreleased, instead of
> leaked.
> >
> > If you're using -- or might use -- Objective-C garbage collection, you'll
> want to replace the cast to (NSArray *) with NSMakeColectable like this:
> >
> > - (NSArray *)applicationsForURL:(NSURL *)url {
> > return [NSMakeCollectable(LSCopyApplicationURLsForURL((CFURLRef)url,
> kLSRolesAll)) autorelease];
> > }
> >
> > The NSMakeCollectable ensures that the CFArrayRef returned by
> LSCopyApplicationURLsForURL will have its lifetime managed by the collector
> if GC is on, since -autorelease has no effect when GC is on. This is also
> correct for non-GC, since NSMakeCollectable when GC is off is effectively
> just a cast from (CFTypeRef) to (id).
> >
> > -- Chris
> >
> >
>
>
i,
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