> 2010/9/12 <cocoa-dev-requ...@lists.apple.com> > >> When it is running on the slow card, the CGDirectDisplayID will be x, and on >> the fast card it will be y. Is there anyway to derive x from y or y from x? >> I am trying to be able to uniquely identify screens even before/after a >> processor switch. > > Given a CGDirectDisplayID, you can use > IORegistryEntryCreateCFProperties to get the display properties. In > the returned CFDictionary, the value associated with the > IODisplayPrefsKey remains the same before/after any GPU switch. > > I don't know if this is documented anywhere, it's just the result of > my observations.
How do I get the CGDirectDisplayID into IORegistryEntryCreateCFProperties? Is this any different than: io_service_t servicePort = CGDisplayIOServicePort (myCGDirectDisplayID); CFDictionaryRef oldInfoDict = IODisplayCreateInfoDictionary (servicePort, kNilOptions); T. _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to arch...@mail-archive.com
