[MFC] 웹캠 영상 위에 도형이나 선 그리는 문제입니다.

#include "vfw.h"
#include "Cameo.h"
 
 
BOOL CNumber_DecodeDlg::OnInitDialog()
{
m_capwnd = capCreateCaptureWindow( "Capture Window",WS_CHILD | WS_VISIBLE,10, 10,352,288, this->m_hWnd, NULL);
}
 
void CNumber_DecodeDlg::OnBtnCameraview() 
{
 if(m_VCon) 
 {
      capDriverDisconnect(m_capwnd); 
      UpdateData(FALSE);
   GetDlgItem(IDC_BUTTON1)->EnableWindow(FALSE);
   m_VCon = FALSE;
   return;
 }
 
 m_VCon = capDriverConnect(m_capwnd, 0);  
 
 if(!m_VCon){ 
 
  AfxMessageBox("캠이 연결되지 않았습니다.");
  return;
 } 
 GetDlgItem(IDC_BUTTON1)->EnableWindow(TRUE); 
 capGetVideoFormat(m_capwnd, &m_capbmp, sizeof(BITMAPINFO)); 
 m_bmprect = m_caprect;
 m_bmprect.top = m_capbmp.bmiHeader.biHeight + 10;
 capPreviewRate(m_capwnd, 60
 capPreview(m_capwnd, TRUE); 
}