请各路高手帮忙!!!!!!!!!!!!!!!
void Ctext1View::OnLButtonDown(UINT nFlags, CPoint point)
{
/////////////////用户点击的逻辑坐标的逻辑坐标值
HDC phdc;
phdc=::GetDC(this->GetSafeHwnd());
CPoint pt=point;
::DPtoLP(phdc,&pt,1);
::ScreenToClient(this->GetSafeHwnd(),&pt);
ClkY=pt.y;
/////////////////重画窗口
this->Invalidate();
this->UpdateWindow();
CView::OnLButtonDown(nFlags, point);
}
ClkY值,也就是pt.y值为什么总是负值?