How do you read the screen of another app?

Unity Engine
1

I need to detect UX change on another app, non Unity.
How do I read its screen?

2

Would this help?
http://stackoverflow.com/questions/1483928/how-to-read-the-color-of-a-screen-pixel

3

No because System.Drawing isn’t available in Unity’s version of Mono

4

Your only option still is in WinAPI, and that will only work for Windows. Mac and Linux will need a different code. There is no crossplatform way, that Unity otherwise mostly is.

But i’m also a little curious on what you are trying to accomplish. Interfering the visuals of another game is often bannable offence.

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