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PONSScreenNumber changes (randomly)?
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copied!<p>In my application I need to distinguish between different displays, which I do by using the NSScreenNumber key of the deviceDescription dictionary provided by NSScreen. So far everything worked flawlessly, but now all of a sudden I sometimes get a different screen ID for my main screen (it's a laptop and I haven't attached a second screen in months, its always the same hardware). The id used to be 69676672 but now most of the time I get 2077806975.</p> <p>At first I thought I might be misinterpreting the NSNumber somehow, but that doesn't seem to be the case, I also checked by using the CGMainDisplayID() function and I get the same value. What is even weirder is that some of the Apple applications still seem to get the old ID: Eg. the desktop image is referenced in its config file using the screen ID and when updating the desktop image the desktop image app by Apple uses the "correct" (=old) ID.</p> <p>I am starting to wonder if there might have been a change in a recent update (10.7.1 or 10.7.2) that led to the change, has anybody else noticed something similar or had this issue before?</p> <p>Here is the code that I use:</p> <pre><code> // This is in an NSScreen category - (NSNumber *) uniqueScreenID { return [[self deviceDescription] objectForKey:@"NSScreenNumber"]; } </code></pre> <p>And for getting an int:</p> <pre><code> // Assuming screen points to an instance of NSScreen NSLog(@"Screen ID: %i", [[screen uniqueScreenID] intValue]); </code></pre> <p>This is starting to get frustrating, appreciate any help/ideas, thanks!</p>

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