Socket server;
        Socket client;
        Thread s;
        IPAddress ip = IPAddress.Parse("127.0.0.1");
        int prot = 6000;
        /// <summary>
        /// 开始监听
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button1_Click(object sender, EventArgs e)
        {
            //输入ＩＰ
            try
            {
                ip = IPAddress.Parse(textBox1.Text);
            }
            catch
            {
                textBox3.Text = "你输入的IP地址格式不正确，请重新输入！";
            }
            //输入端口
            try
            {
                int i = Int32.Parse(textBox2.Text);
                if (i >= 0 && i <= 65535)
                {
                    prot = i;
                }
                else
                {
                    textBox3.Text = "请输入0--65535之间的数字";
                }
            }
            catch
            {
                textBox3.Text = "请输入端口号！";
            }
            //开始监听
            try
            {
                s = new Thread(new ThreadStart(start));
                s.Start();
            }
            catch (Exception ee)
            {
                textBox3.Text = ee.Message;
            }
        }
        /// <summary>
        /// 监听请求
        /// </summary>
        void start()
        {
            //创建套接字
            server = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            //绑定到本地
            IPEndPoint ipPoint = new IPEndPoint(ip, prot);
            server.Bind(ipPoint);
            //开始侦听
            server.Listen(5);
            //接受客户端请求
            client = server.Accept();
            textBox3.Text = "主机" + Dns.GetHostName() + "端口" + textBox2.Text + "开始监听........";
            if (client.Connected)
            {
                textBox3.Text = "与客户端建立了连接";
                while (true)
                {
                    //接受数据
                    byte[] data = new byte[1024];
                    int size = client.Receive(data);
                    string result = Encoding.Unicode.GetString(data, 0, size);
                    if (result == "[---===退出===---]")
                    {
                        textBox3.Text = "你失去了与客户端的联系";
                        server.Shutdown(SocketShutdown.Both);
                        server.Close();
                    }
                    //richTextBox1.AppendText(result);
                    else
                    {
                        string[] aa = result.Split('~');
                        richTextBox1.AppendText(aa[0] + "说:" + aa[1] + "\r");
                    }
                }
            }
        }

        private void button4_Click(object sender, EventArgs e)
        {
            try
            {
                //发送数据
                //byte[] msg = Encoding.Unicode.GetBytes(richTextBox2.Text);
                byte[] msg = Encoding.Unicode.GetBytes(Dns.GetHostName() + "~" + richTextBox2.Text);
                client.Send(msg);
                //这里既可以将BYTE类型的数组从新解码再输出也可以直接输出richTextBox2中的文本
                string aa = Encoding.Unicode.GetString(msg);
                //richTextBox1.AppendText("本机&q