UpdateWindow function (winuser.h)
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
[in] hWnd
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.
Requirements
Minimum supported client | Windows 2000 Professional [desktop apps only] |
Minimum supported server | Windows 2000 Server [desktop apps only] |
Target Platform | Windows |
Header | winuser.h (include Windows.h) |
Library | User32.lib |
DLL | User32.dll |
API set | ext-ms-win-ntuser-draw-l1-1-0 (introduced in Windows 8) |