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How to get the CGDirectDisplayID?

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How to get the CGDirectDisplayID?

Subject: How to get the CGDirectDisplayID?
From: Andreas Mayer <email@hidden>
Date: Tue, 26 Apr 2005 02:10:13 +0200

I would like to use some CGDisplay... function to get information about an NSScreen.

NSScreen's -deviceDescription methods returns a dictionary that, according to

<http://developer.apple.com/documentation/Cocoa/Conceptual/DrawEnv/ Concepts/devices.html>

has an entry that holds the CGDirectDisplayID:


"@"NSScreenNumber"

An NSNumber that contains the CGDirectDisplayID for the screen device. This key is only valid for the device description dictionary for an NSScreen."


That's great, but ... CGDirectDisplayID is declared as:

typedef struct _CGDirectDisplayID * CGDirectDisplayID;

So I guess my question is: How exactly do I get the CGDirectDisplayID from that NSNumber instance?

Thanks for any insight. :)


Andreas

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