帮忙看下这段代码！

void CWeldingDlg::OnCreat()  
{ 
UpdateData(TRUE); 
CClientDC dc(this);//device context for Client
    CBrush brush(RGB(255,255,255));  //白色画刷
    dc.SelectObject(&brush); 
RECT rect1; 
//ScreenToClient(&rect1); //这句没用
GetDlgItem(IDC_PICTURE)->GetWindowRect(&rect1); 
ScreenToClient(&rect1); 
dc.Rectangle(rect1.left,rect1.top,rect1.right,rect1.bottom); //画一个矩形CRect rect2; 
GetClientRect(&rect2); //估计问题出在这里，试用以下两句代替这一句
//GetWindowRect(&rect2);
//ScreenToClient(&rect2);dc.SetViewportOrg(rect2.Width()/2-m_width/2,rect2.Height()/2+m_height1/2);   //设置坐标原点dc.MoveTo(-1.5*m_height1,0); 
dc.LineTo(0,0); 
dc.LineTo(0,m_height1); 
dc.LineTo(-1.5*m_height1,m_height1); 
dc.MoveTo(m_width+1.5*m_height2,0); 
dc.LineTo(m_width,0); 
dc.LineTo(m_width,m_height2); 
dc.LineTo(m_width+1.5*m_height2,m_height2); 
// TODO: Add your control notification handler code here }