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In my program I use class Process to start another application. This application starts fullscreen. My purpose is to handle mouse click from that application in my program. What WinApi functions should I use?
By “WinApi”, I assume that you mean “Win32”.
In order to handle messages of another process, you need to install a Win32 hook. See this article for more details. You need the WH_MOUSE hook and the SetWindowsHookEx Win32 API.
A hook function needs to be in a DLL, so that it can be injected in any process. You will need to filter the messages you get for the process that you started.
A hook function needs to be a global function so you must code it in C++. You will also need to use some inter-process communication to well, communicate with your main program, if needed.