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void CMyView::OnMouseMove(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
ax=0;
ay=0;
ax=point.x;
ay=point.y;
//////////////////////////////////////
//画矩形
CDC* pDC=GetDC();
CPen pen(PS_SOLID,3,RGB(255,0,0));
CPen* OldPen=pDC->SelectObject(&pen);
pDC->Rectangle(ax,ay,ax+180,ay+114);
pDC->SelectObject(OldPen);
///////////////////////////////////////
CScrollView::OnMouseMove(nFlags, point);
}