What do I have to do to make my WH_SHELL or WH_CBT hook procedure receive events from other processes?

Question

I\'m trying to use SetWindowsHookEx to set up a WH_SHELL hook to get notified of system-wide HSHELL_WINDOWCREATED and HSHELL_WIN

Answer 1

Just to clarify something that "efotinis" mentioned about posting messages back to your process - the wParam and lParam that you post to your main process can't be pointers, they can just be "numbers".

For example, lets say you hook the WM_WINDOWPOSCHANGING message, windows passes you a pointer to a WINDOWPOS in the lparam. You can't just post that lparam back to your main process because the memory the lparam is pointing to is only valid in the process that recieves the message.

This is what "efotinis" meant when he said " cram the needed info (event and HWND) into its WPARAM/LPARAM". If you want to pass more complex messages back your going to need to use some other IPC (like named pipes, TCP or memory mapped files).