MFC/QT 在控件上实时显示图像

//----------MFC获取句柄显示-------------------

void ShowImage(IplImage* img, UINT ID) //在picture控件中显示图片的代码
{
  CDC* pDC=GetDlgItem(ID)->GetDC();
  HDC hDC=pDC->GetSafeHdc();
  CRect rect;
  GetDlgItem(ID)->GetClientRect(&rect);
  SetRect(rect,rect.left,rect.top,rect.right,rect.bottom);
  CvvImage cimg;
  cimg.CopyOf( img ); // 复制图片
  cimg.DrawToHDC( hDC, &rect );  // 将图片绘制到显示控件的指定区域内
  ReleaseDC( pDC );
}

//---------QT获取句柄显示-------------------------

void resizeEvent(QResizeEvent * event)
{
	QFrame::resizeEvent(event);

	QSize size = m_imageLable->size();
	SetWindowExtents(m_halWnd,0,0,size.width(),size.height());
}

void initHalWnd()
{
	QSize size = m_imageLable->size();
	
	HWND parent = (HWND)m_imageLable->winId();
	OpenWindow(0,0,size.width(),size.height(),(Hlong)parent,"","",&m_halWnd);
}

void onGrab()
{
	QHCamera * cam = getCurCamera();
	if(cam)
	{	
		cam->grab(&m_image);
		DispObj(m_image,m_halWnd);
	}
}