I am trying to overlay a fullscreen application on Windows 10 using C++ (I’d like to be able to render styled html later but just making the overlay work now is fine); however, I am running into a few issues with the approaches I have tried: Since the game must be in fullscreen mode, creating a transparent window and setting it to topmost is not viable. Additionally, the game has anticheat, so I do not want to inject any code or modify its memory if possible.

The only reasonable solutions I have found so far that can overlay on a fullscreen application are from (adamhlt’s repositories). Unfortunately, the overlays he has created seem to be oriented towards cheating (and I do not want to create a cheat with this), and they also hook into the applications, so they would likely get flagged by the anticheat.

I was wondering if anyone could point me in the right direction on how to approach this problem. The overlay doesn’t need to interact with the fullscreen game in any way at all; it just needs to be over it.

Thanks!