GetForegroundWindow function (winuser.h)
Retrieves a handle to the foreground window (the window with which the user is currently working). The system assigns a slightly higher priority to the thread that creates the foreground window than it does to other threads.
The return value is a handle to the foreground window. The foreground window can be NULL in certain circumstances, such as when a window is losing activation.
|Minimum supported client
|Windows 2000 Professional [desktop apps only]
|Minimum supported server
|Windows 2000 Server [desktop apps only]
|winuser.h (include Windows.h)
|ext-ms-win-ntuser-window-l1-1-0 (introduced in Windows 8)