请教OnLButtonDown后，本进程就关不了了。

void CMeasureView::OnLButtonDown(UINT nFlags, CPoint point) 

{





	// TODO: Add your message handler code here and/or call default

	CFormView::OnLButtonDown(nFlags, point);



	if(MeasuringChoose==true&&point.x>0&&point.y>0&&point.y<m_Height&&point.x<m_Width)

	{

		switch(MeasureType)

		{

		case 2:

			{

				ChoosePoint1x=point.x;

                ChoosePoint1y=576-point.y;

				CPen *oldPen ;

				CPen solidPen(PS_SOLID, 0,RGB(0,255,0));

				CPen pianPen(PS_SOLID,  0,RGB(255,0,0));

				CPen HengPen(PS_SOLID, 0,RGB(60,60,160));						

				CClientDC Dc(this); 						

				

				CWnd* wnd; 

				wnd=GetDlgItem(IDC_STATIC_DISPLAY);

				CRect rect; 

				wnd->GetClientRect(rect);

				

				CDC *dc=NULL;

				dc=wnd->GetDC();

				oldPen = dc->SelectObject (&pianPen);

				

				dc->MoveTo(point.x,point.y-3);

				dc->LineTo(point.x,point.y+3);

				dc->MoveTo(point.x+3,point.y);

				dc->LineTo(point.x-3,point.y);

				

				MeasuringChoose=false;

				MeasureType=0;

				ReleaseDC(dc);

				break;

			}

		default:

			{

				break;

			}

		}

				

	}	



}