问一个简单问题

[xiangye]

小弟刚学VC，现在有一个问题如下：
void CMiniDrawView::OnMouseMove(UINT nFlags, CPoint point)
{
// TODO: Add your message handler code here and/or call default
::SetCursor (m_HCross);
if (m_Dragging)
{
CClientDc ClientDc (this);
ClientDC.SetROP2 (R2_NOT);
ClientDC.MoveTo (m_PointOrigin);
ClientDC.LineTo (m_PointOld);
ClientDC.MoveTo (m_PointOrigin);
ClientDC.LineTo (point);
m_PointOld=point;
}
CView::OnMouseMove(nFlags, point);
}
运行后有如下提示：error C2065: 'CClientDc' : undeclared identifier
可我是按书上打的啊

[musicdancer]

????我没看错巴?CClientDc当然错啦!是CClientDC!!!

[xiangye]

是啊，是啊，书上错了，谢谢了