I am using an event tap in a Mac app to detect key presses and mouse movements. For the next step I would like to distinguish between an internal keyboard/trackpad and an external keyboard/mouse/trackpad. Does any one have any idea how to do this?
Detecting internal or external devices in event tap
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You need to use the DDHidLib instead. If you want an example, check out this Open Source application:
https://github.com/FeeJai/MultiLayout