UpdateWindow function

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


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

Minimum supported client

Windows 2000 Professional [desktop apps only]

Minimum supported server

Windows 2000 Server [desktop apps only]

Header

Winuser.h (include Windows.h)

Library

User32.lib

DLL

User32.dll

See also

Painting and Drawing Overview
Painting and Drawing Functions
ExcludeUpdateRgn
GetUpdateRect
GetUpdateRgn
InvalidateRect
InvalidateRgn
WM_PAINT

 

 

Build date: 6/12/2013

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