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it works
Thanks wilbert !!

ImportC ""
CGDisplayCreateImage(displayID)
CGImageGetHeight(image)
CGImageGetWidth(image)
CGImageRelease(image)
CGMainDisplayID()
EndImport

Procedure GetScreenX()

Define CGImage, NSImage, ImageRect.NSRect

CGImage = CGDisplayCreateImage(CGMainDisplayID()); get CGImage from main display ...

is working.
Thank you !!!

CocoaMessage allows you to send messages to cocoa objects.
CGDisplayCreateImage is a normal C function that needs to be imported using ImportC.

Something like this EnableExplicit

ImportC ""
CGDisplayCreateImage(displayID)
CGImageGetHeight(image)
CGImageGetWidth(image)
CGImageRelease(image ...