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20101556
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2013-11-20T16:34:25.397
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2013-11-21T12:16:03.653
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I have found no conceputally better way than what you list as "Tried". But I found a solution for the ambiguity issue of comparing only vendor id and product id. <code>oldInfoDict</code> and <code>newInfoDict</code> in your code contain an additional entry for key <code>kIODisplayEDIDKey</code> (defined in <a href="http://www.opensource.apple.com/source/IOGraphics/IOGraphics-233/IOGraphicsFamily/IOKit/graphics/IOGraphicsTypes.h" rel="nofollow">IOGraphicsTypes.h</a>) which contains the <a href="http://en.wikipedia.org/wiki/Extended_display_identification_data" rel="nofollow">EDID</a> of each connected display. My observations show that this data as a whole stays persistent between GPU switches. For example: <pre><code> CGDirectDisplayID displayId = [[[screen deviceDescription] valueForKey:@"NSScreenNumber"] unsignedIntValue]; io_service_t displayPort = CGDisplayIOServicePort(displayId); if (displayPort == MACH_PORT_NULL) return nil; // No physical device to get a name from. CFDictionaryRef infoDict = IODisplayCreateInfoDictionary(displayPort, kIODisplayOnlyPreferredName); NSData *displayEdid = (NSData *)CFDictionaryGetValue(infoDict, CFSTR(kIODisplayEDIDKey)); NSLog(@"EDID: %@", displayEdid); CFRelease(infoDict); </code></pre> Looking at the data description of <a href="http://en.wikipedia.org/wiki/Extended_display_identification_data" rel="nofollow">EDID</a> in Wikipedia, this blob already contains manufacturer, product id and serial. So it's enough to compare displays by using the EDID data (or for example a hash of it if you only want to compare a shorter number).
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1. POHow to resolve CGDirectDisplayID changing issues on newer multi-GPU Apple laptops in Core Foundation/IO Kit?
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1. USdrott
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1. USdrott
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