DirectShow视频失去焦点恢复时无法刷新的解决

1.WS_CLIPCHILDREN

ModifyStyle(0,WS_CLIPCHILDREN);

2.ON_ERASEBKGND:

 if(m_pGraph)
 {
  CRect rc;
  GetClientRect(&rc);  
  rc.bottom-=panelHeight;
  pDC->ExcludeClipRect(&rc); //若有在播放则不擦除绘制该区域
  
 }

 return CDialog::OnEraseBkgnd(pDC);