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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