The WM_NCMOUSEMOVE message is posted to a window when the cursor is moved within the nonclient area of the window. This message is posted to the window that contains the cursor. If a window has captured the mouse, this message is not posted.
WM_NCMOUSEMOVE nHittest = (INT) wParam; // hit-test value pts = MAKEPOINTS(lParam); // position of cursor
If an application processes this message, it should return zero.
If it is appropriate to do so, the system sends the WM_SYSCOMMAND message to the window.
An application can use the MAKEPOINTS macro to convert the lParam parameter to a POINTS structure.
DefWindowProc, MAKEPOINTS, POINTS, WM_NCHITTEST, WM_SYSCOMMAND
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