获取 HDC 的函数

BeginPaint( hWnd, &ps )     EndPaint( hWnd, &ps  )

GetDC( hWnd )                  ReleaseDC( hWnd, hdc );

GetWindowDC( hWnd )      ReleaseDC( hWnd,hdc );

CreateDC (pszDriver, pszDevice, pszOutput, pData) ;        DeleteDC (hdc) ;

CreateIC (pszDriver, pszDevice, pszOutput, pData) ;        DeleteDC (hdc) ;

CreateCompatibleDC( hdc )      DeleteDC( hmemdc);