鼠标点击事件，但是没反应，求解答

Question

void CTTTDlg::OnRButtonDown(UINT nFlags, CPoint point) 
{
// TODO: Add your message handler code here and/or call default
CDC *dc = GetDC();
GetCursorPos(&point);
dc->Ellipse(CRect(point.x,point.y,point.x+20,point.y+20));
CDialog::OnRButtonDown(nFlags, point);
}

Answer 1

//设置成员BOOL m_bRButtonDown;
//       CPoint m_ptRButtonDown;OnInitDialog()里m_bRButtonDown = FALSE;void CTTTDlg::OnRButtonDown(UINT nFlags, CPoint point)  
{
// TODO: Add your message handler code here and/or call default
m_bRButtonDown = TRUE;
m_ptRButtonDown = point;
Invalidate();
CDialog::OnRButtonDown(nFlags, point);
}//绘图应该放到OnPaint()
void CTTTDlg::OnPaint()
{
//...if (m_bRButtonDown)
{
dc.Ellipse(CRect(m_ptRButtonDown.x,m_ptRButtonDown.y,m_ptRButtonDown.x+20,m_ptRButtonDown.y+20));
}
//...
}

Answer 2

形参里已经有point这个参数，直接用他即可