The UpdateWindow function updates the client area of the specified window by sending a WM_PAINT message to the window if the window's update region is not empty. The function sends a WM_PAINT message directly to the window procedure of the specified window, bypassing the application queue. If the update region is empty, no message is sent. BOOL UpdateWindow( HWND hWnd // handle of window ); ParametershWndIdentifies the window to be updated. Return ValuesIf the function succeeds, the return value is nonzero. If the function fails, the return value is zero.
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ParametershWndIdentifies the window to be updated. Return ValuesIf the function succeeds, the return value is nonzero.
If the function fails, the return value is zero.