void Cmfc_testDlg::OnMouseMove(UINT nFlags, CPoint point)
{// TODO: 在此添加消息处理程序代码和/或调用默认值if(nFlags == MK_LBUTTON){......}if(nFlags == (MK_CONTROL | MK_SHIFT)){......}......CDialogEx::OnMouseMove(nFlags, point);
}

//保存指定区域的背景到参数MemBitmap
void ScreenShot(CBitmap *MemBitmap, CDC* pDC, int Xcoords, int Ycoords, int Width, int Height)
{    CDC memDC; memDC.CreateCompatibleDC(pDC);        MemBitmap->CreateCompatibleBitmap(pDC, Width, Height);    memDC.SelectObject(MemBitmap);    memDC.BitBlt(0, 0, Width, Height, pDC, Xcoords, Ycoords, SRCCOPY);      memDC.DeleteDC();
}//鼠标移动事件函数
void CXXXDlg::OnMouseMove(UINT nFlags, CPoint point)
{    // TODO: 在此添加消息处理程序代码和/或调用默认值
CClientDC cdc(this); if(!m_first_show_flag)        {          m_OldX = point.x+10;            m_OldY = point.y-20;   m_MemBitmap.DeleteObject();            ScreenShot(&cdc, &m_MemBitmap, m_OldX, m_OldY, 110, 50);//保存要输出的文字区域的背景图片
cdc.SetBkMode(TRANSPARENT);CString strPointMove;strPointMove.Format(_T("%d, %d"), point.x, point.y);cdc.DrawText(strPointMove, CRect(m_OldX,m_OldY, m_OldX+110, m_OldY+50), DT_LEFT);//在文字区域输出坐标
m_first_show_flag = true;    }        else        {                 BITMAP bm;            m_MemBitmap.GetObject (sizeof(BITMAP), &bm);            CDC MemDC;      MemDC.CreateCompatibleDC(&cdc);            CBitmap *pOldBitmap=MemDC.SelectObject(&m_MemBitmap);             cdc.BitBlt(m_OldX, m_OldY, bm.bmWidth , bm.bmHeight, &MemDC, 0, 0, SRCCOPY);//利用保存的原文字区域的背景图片去除原来文字区域的

文字                MemDC.SelectObject(pOldBitmap);            MemDC.DeleteDC();m_OldX = point.x+10;//新坐标作为下次使用的前一次坐标            m_OldY = point.y-20;            m_MemBitmap.DeleteObject();            ScreenShot(&cdc, &m_MemBitmap, m_OldX, m_OldY, 110, 50);//保存要输出的文字区域的背景图片
cdc.SetBkMode(TRANSPARENT);CString strPointMove;strPointMove.Format(_T("%d, %d"), point.x, point.y);cdc.DrawText(strPointMove, CRect(m_OldX, m_OldY, m_OldX+110, m_OldY+50), DT_LEFT);//在文字区域输出坐标
    }CDialog::OnMouseMove(nFlags, point);
}