C#第一个正式应用,ASP.NET追捕休整版!
 这个程序,是前天我买到Visual Studio.net beta 2 中文版后编写的第一个正式程序,感觉只真是好极了!!
 
 这个追捕的代码参考过飞刀的ASP.NET 追捕的文章，但他文章中是针对.NET 框架beta1的,而BETA2中好多的地方都修改调整了,顺便也给程序增加了列表IP的功能，也就是说主机的多个IP地址都可以列出来的.只是那个根据IP查到IP所在地的功能暂时没做,因为当时我用的机器是朋友的,而手头没有IP数据库:~(
 
 static void Main()
 {
 Application.Run(new Form1());
 }
 
 private void Form1_Load(object sender, System.EventArgs e)
 {
 string Localhost = System.Net.Dns.GetHostName();
 int i = 0;
 int n = Dns.Resolve(Localhost.ToString()).AddressList.GetLength(0);
 lblIpInfo.Text = Localhost.ToString()+",就是你啊!";
 txtHostname.Text = Dns.Resolve(Localhost.ToString()).AddressList.GetValue(0).ToString();
 lblSystem.Text = "待命中...";
 lblHttp.Text = "待命中...";
 lblFtp.Text = "待命中...";
 lblDns.Text = "待命中...";
 lblTelnet.Text = "待命中...";
 lblSmtp.Text = "待命中...";
 lblPop.Text = "待命中...";
 for(;i<n;i++)
 {
 IPListbox.Items.Add(Dns.Resolve(Localhost.ToString()).AddressList.GetValue(i).ToString());
 }
 }
 
 private void cmdExec_Click(object sender, System.EventArgs e)
 {
 IPAddress theIP;
 txtHostname.Focus();
 if(txtHostname.Text.Length==0)
 {
 MessageBox.Show("您可以输入要追捕的IP或者主机名称！但不能为空","系统提示");
 return; //false
 }
 try
 {
 int i = 0;
 int n = Dns.Resolve(txtHostname.Text.ToString()).AddressList.GetLength(0);
 IPListbox.Items.Clear();
 for(;i<n;i++)
 {
 IPListbox.Items.Add(Dns.Resolve(txtHostname.Text.ToString()).AddressList.GetValue(i).ToString());
 }
 theIP = (IPAddress)Dns.Resolve(txtHostname.Text.ToString()).AddressList.GetValue(0);
 lblIpInfo.Text = theIP.ToString();
 if(check1.Checked==true)
 {//
 lblSystem.Text = "检测中...";
 lblHttp.Text = "检测中...";
 lblFtp.Text = "检测中...";
 lblDns.Text = "检测中...";
 lblTelnet.Text = "检测中...";
 lblSmtp.Text = "检测中...";
 lblPop.Text = "检测中...";
 //检查服务
 DetectService(theIP);
 DetectPort(theIP);
 lblSystem.Text = strSystem.ToString();
 lblHttp.Text = strHttp.ToString();
 lblFtp.Text = strFtp.ToString();
 lblDns.Text = strDns.ToString();
 lblTelnet.Text = strTelnet.ToString();
 lblSmtp.Text = strSmtp.ToString();
 lblPop.Text = strPop.ToString();
 }
 
 if(check2.Checked==true)
 {
 //查IP 所在地区，未实现
 }
 }
 catch
 {
 MessageBox.Show("这个主机无法连接哦!\r\n请重新输入一个正确的吧！","系统提示");
 txtHostname.Text = "";
 txtHostname.Focus();
 lblIpInfo.Text = "无法连接或转换IP，所在地大概是外星球!";
 lblSystem.Text = "待命中...";
 lblHttp.Text = "待命中...";
 lblFtp.Text = "待命中...";
 lblDns.Text = "待命中...";
 lblTelnet.Text = "待命中...";
 lblSmtp.Text = "待命中...";
 lblPop.Text = "待命中...";
 }
 return;
 }
 
 private void DetectService(IPAddress theIP)
 {
 string tFtp = TcpConnect(theIP,21); //is ftp service
 string tTelnet = TcpConnect(theIP,23); //is Telnet service
 string tDns = TcpConnect(theIP,43); //is Dns service
 string tPop = TcpConnect(theIP,110); //is Pop3 service
 string tSmtp = TcpConnect(theIP,25); //is Mail smtp service
 if(tFtp!="None")strFtp = tFtp;
 if(tTelnet!="None")strTelnet = tTelnet;
 if(tDns!="None")strDns = tDns;
 if(tPop!="None")strPop = tPop;
 if(tSmtp!="None")str