return true;
　　　}
　　}
　}

　return false;
}

　　在表格的某一格处于焦点时，我们应给其画一个矩形边框：

int XTable::Draw(CDC* pDC)
{
　//…
　if (focusRow < rows && focusCol < cols) //**
　{
　　RECT rect = GetRect (focusRow, focusCol);
　　GetCells (focusRow, focusCol)->DrawHitBorder(pDC, rect, RGB(0xb0, 0xb0, 0xb0));
　}

　return 0;
}

int XCell::DrawHitBorder (CDC* pDC, RECT rect, COLORREF color)
{
　CPen pen (PS_SOLID, 2, color);
　CPen* oldPen = pDC->SelectObject(&pen);
　pDC->MoveTo (rect.left, rect.top);
　pDC->LineTo (rect.right, rect.top);
　pDC->LineTo (rect.right, rect.bottom);
　pDC->LineTo (rect.left, rect.bottom);
　pDC->LineTo (rect.left, rect.top);
　pDC->SelectObject(oldPen);
　return 0;
}

　　获得IP地址监控范围内主机列表的方法如下：

m_fromip.GetAddress(fromip);
m_toip.GetAddress(toip);

rthread = CreateThread(NULL, 0, sniff, 0, 0, 0);
Sleep(100); //保证sniff线程已经稳定运行
SendArpReq(1, myip, mmac);
while (1)
{
　if (!(!mmac[0] && !mmac[1] && !mmac[2] && !mmac[3]))
　　break;
　Sleep(100);
}

for (unsigned long i = fromip; i < myip; i++)
{
　SendArpReq(myip, i, mmac);
}

for (i = myip + 1; i <= toip; i++)
{
　SendArpReq(myip, i, mmac);
}

Sleep(1000);

for (i = 0; i < currentHstIndex; i++)
{
　HOSTENT *tmpHostent;
　tmpHostent = gethostbyaddr((char*)(&(hostList[i].ip)), 16, AF_INET);
　if (tmpHostent)
　　m_hostList.SetText(i + 1, 0, tmpHostent->h_name);
　m_hostList.SetText(i + 1, 1, inet_ntoa(*(struct in_addr*)(&(hostList[i].ip)))) ;
　m_hostList.SetText(i + 1, 3, "OFF");
　CString str;
　str.Format("%02x-%02x-%02x-%02x-%02x-%02x", hostList[i].mac[0],
　　hostList[i].mac[1], hostList[i].mac[2], hostList[i].mac[3],
　　hostList[i].mac[4], hostList[i].mac[5]);
　m_hostList.SetText(i + 1, 2, str);
　m_hostList.SetText(i + 1, 4, "OFF");

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