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UpdateWindow function

Applies to: desktop apps only

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.

Syntax

Copy

BOOL UpdateWindow(
  __in  HWND hWnd
);

Parameters

hWnd [in]: Handle to the window to be updated.

Return value

If the function succeeds, the return value is nonzero.

If the function fails, the return value is zero.

Examples

For an example, see Drawing in the Client Area.

Requirements