vc画线

private:
 CPoint m_ptOrigin;

CPtestView::CPtestView()
{
 // TODO: add construction code here
    m_ptOrigin=0;
}

void CPtestView::OnLButtonDown(UINT nFlags, CPoint point)
{
 // TODO: Add your message handler code here and/or call default
// MessageBox("view clicked");
 m_ptOrigin=point;
 CView::OnLButtonDown(nFlags, point);
}

void CPtestView::OnLButtonUp(UINT nFlags, CPoint point)
{

 // TODO: Add your message handler code here and/or call default
 //画线1
 
 /*HDC hdc;
 hdc=::GetDC(m_hWnd);
 MoveToEx(hdc,m_ptOrigin.x,m_ptOrigin.y,NULL);
 LineTo(hdc,point.x,point.y);
    ::ReleaseDC(m_hWnd,hdc);
    */

 //画线2
 /*
 CDC *pDc=GetDC();
    pDc->MoveTo(m_ptOrigin);
 pDc->LineTo(point);
    ReleaseDC(pDc);
    */

 //画线3
    /*
 CClientDC dc(this);//dc(GetParent());
 dc.MoveTo(m_ptOrigin);
 dc.LineTo(point);
    */
 /*
 //画线4
 //CWindowDC  dc(this);//本View的指针地址
 //CWindowDC  dc(GetParent());//父框架的指针地址
 CWindowDC  dc(GetDesktopWindow());//GetDesktopWindow();桌面得指针地址
 dc.MoveTo(m_ptOrigin);
 dc.LineTo(point);
    */

    //画线5
 /*
 CPen pen(PS_SOLID,10,RGB(255,0,0));
    CClientDC dc(this);
 CPen *pOldPen=dc.SelectObject(&pen);
 dc.MoveTo(m_ptOrigin);
 dc.LineTo(point);
 dc.SelectObject(pOldPen);
    */
 CView::OnLButtonUp(nFlags, point);

}