也许
BitBlt 不支持此类操作。尝试解决方法：

Maybe BitBlt does not support such operations. Try a workaround:

  
drawHandle = GetDC（ hWnd ）;

   drawHandle = GetDC( hWnd );

  
IntersectClipRect（drawHandle，0,0,1000,1000）;

   IntersectClipRect( drawHandle, 0, 0, 1000, 1000 );

或

  
drawHandle = GetDC（ hWnd ）;

   drawHandle = GetDC( hWnd );

  
SelectClipRgn（drawHandle，rect）;

   SelectClipRgn( drawHandle, rect );