c++ - How can I CreateProcess with DPI awareness set to DPI_AWARENESS_CONTEXT_UNAWARE

Question

I have C++ application which opens other apps with CreateProcessA on Windows 10. These apps could have different settings for DPI Awareness.

So the question is - can I create processes with DPI Awareness set to DPI_AWARENESS_CONTEXT_UNAWARE?

If not - then perhaps I can set DPI_AWARENESS_CONTEXT_UNAWARE for the already created process?

UPD: My application spawns the app and then changes one's position. And if it appears to be another monitor with different DPI then scaled values are supplied.

If the app is DPI awared then after the move completed the dimensions changed according WM_DPICHANGED message values. Spawned apps could have different DPI Aware modes. So idea was to set them one mode and control position and dimensions of all of them with same logic.

Answer 1

If the app does not already have a manifest, you can use SetProcessDpiAwarenessContext to set the awareness. Also check this.

You cannot set the awareness on an existing app unless if injecting a remote thread with CreateRemoteThread, in which case you may cause incompatibilities when forcing something that the app is not aware of.