The IDirectDrawClipper::SetHWnd method sets the window handle that will obtain the clipping information.
HRESULT SetHWnd(
DWORD dwFlags,
HWND hWnd
);
If the method succeeds, the return value is DD_OK.
If the method fails, the return value may be one of the following error values:
DDERR_INVALIDCLIPLIST |
DDERR_INVALIDOBJECT |
DDERR_INVALIDPARAMS |
DDERR_OUTOFMEMORY |