Call this member function to retrieve the coordinates of the smallest rectangle that completely encloses the update region.
BOOL GetUpdateRect( LPRECT lpRect, BOOL bErase = FALSE );
| Header File | Afxwin.h | 
| Platforms | |
| Versions | 1.0 and later | 
| Complete documentation | Visual C++ documentation | 
CWnd Overview, CWnd Member Functions, Window Class Categories, CWnd::BeginPaint, CWnd::OnPaint, CWnd::RedrawWindow