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Re: Get list of possible applications
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Re: Get list of possible applications


  • Subject: Re: Get list of possible applications
  • From: Gerd Knops <email@hidden>
  • Date: Sun, 20 Apr 2008 10:15:28 -0500


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


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  • Follow-Ups:
    • Re: Get list of possible applications
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References: 
 >Get list of possible applications (From: Daniel <email@hidden>)
 >Re: Get list of possible applications (From: Gerd Knops <email@hidden>)
 >Re: Get list of possible applications (From: Chris Hanson <email@hidden>)

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