Re: Reasons why QL would fail to create thumbnail?
Re: Reasons why QL would fail to create thumbnail?
- Subject: Re: Reasons why QL would fail to create thumbnail?
- From: Julien Jalon <email@hidden>
- Date: Thu, 27 Aug 2009 14:45:23 +0200
Might be interesting to ask your user to use qlmanage -t on the file
to see if anything relevant appears here.
Also what kind of file is it? Maybe the user has some plugin installed there.
On Thursday, August 27, 2009, Graham Cox wrote:
> I'm using the following code to generate thumbnail images in one of my user interfaces. It works fine on my machine, and on all the ones I've tested, but a couple of users have reported that they don't see the thumbnails. One user experiencing this problem helped me to log some results which shows that the QLThumbnailImageCreate function is returning nil. The docs state that this will return nil if it can't read the file, but it's the exact same file on every system, loaded from my app's resources. So why would it fail in a few percent of cases, but mostly work? All affected users are running the latest system version.
>
>
> CFURLRef url = CFURLCreateWithFileSystemPath( NULL, (CFStringRef)[self path], kCFURLPOSIXPathStyle, NO );
>
> // logging the URL/path at this point shows that the correct path is being returned from [self path], a path to app internal resources
>
> CGSize maxImageSize = CGSizeMake( 512, 512 );
> NSDictionary* options = [NSDictionary dictionaryWithObjectsAndKeys:(id)kCFBooleanTrue, kQLThumbnailOptionIconModeKey, nil];
>
> CGImageRef qli = QLThumbnailImageCreate( NULL, url, maxImageSize, (CFDictionaryRef)options );
> CFRelease( url );
>
> // on a very few systems, qli is nil here
>
> Is there a possibility that QuickLook can somehow be turned off?
>
> Any ideas?
>
> --Graham
>
>
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