opencv webcam capture problem!!

[bingerlee]

My code is to display a webcam. I meet problem when it runs. I am working with VC 6.0 and using opencv , and I add a button command function ,codes as follow:
void CFace2View::OnBtnStart()
{
CClientDC pDC(this);

if((m_pcapture = cvCaptureFromCAM(-1)) == NULL)
{
MessageBox("Could not initialize capturing...\n");
return ;
}

for(;;)
{

if(NULL==(m_frame=cvQueryFrame(m_pcapture)))
{
MessageBox("Can not get frame!");
break;
}
CRect r;
GetClientRect (&r);
m_image.CopyOf(m_frame,1);
m_image.DrawToHDC(pDC.GetSafeHdc() ,r);
if(!m_camflag)
break;

}

cvReleaseCapture(&m_pcapture);

//return ;
}

and in ONDRAW（）function ：

void CFace2View::OnDraw(CDC* pDC)
{
CFace2Doc* pDoc = GetDocument();
ASSERT_VALID(pDoc);
// TODO: add draw code for native data here
CRect r;
GetClientRect (&r);
m_image.DrawToHDC(pDC->GetSafeHdc() ,r);
}


When it runs ,it displays well ,but when I click mouse in window or move window, the program would die. Who can help me?? thanks

[Mythios]

You already have a topic on the other Board. Delete one of them?