| HWND GetCapture(void) |
The GetCapture function retrieves the handle of the window that has the mouse capture, if any. Only one window can have the mouse capture at any given time; this window receives mouse input whether or not the mouse cursor is within its borders.
This function has no parameters.
The return value is the handle of the mouse-capture window associated with the current thread. If no window in the thread has the mouse capture, the return value is NULL.
A NULL return value does not mean no other thread or process in the system has the mouse capture; it just means the current thread does not have the mouse capture.
ReleaseCapture, SetCapture