updatewindow函數

  UpdateWindow

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 to window
         );           

Parameters

hWnd

[in] Handle to the window to be updated.

Return Values

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero.