C#.net同步异步SOCKET通讯和多线程总结(12)

              }

              IPHostEntry ipHost ;

              try

              {

                   ipHost = Dns.Resolve ( textBox1.Text ) ;　

              }

              catch //判断IP地址对应主机是否在线

              {

                   MessageBox.Show ("远程主机不在线！" , "错误提示！" ) ;

                   return ;

              }

              string sHostName = ipHost.HostName ;

              try

              {

                   TcpClient tcpClient = new TcpClient(sHostName,8000);//对远程主机的8000端口提出TCP连接申请

                   nsStream = tcpClient.GetStream();//通过申请，并获取传送数据的网络基础数据流　　

                   swWriter = new StreamWriter(nsStream);//使用获取的网络基础数据流来初始化StreamWriter实例

                   button1.Enabled = false ;

                   button2.Enabled = true ;

                   tcpConnect = true ;

                   statusBar1.Text = "已经连接！" ;

              }

              catch

              {

                   MessageBox.Show ( "无法和远程主机8000端口建立连接！" , "错误提示！" ) ;