//建立socket物件
            //第一個引數：設定網路定址的協議、第二引數設定資料傳輸的方式、第三個引數設定通訊協議
            Socket serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            //2.繫結IP埠
            string str = "127.0.0.1";
            int ports = 55555;
            IPAddress ip = IPAddress.Parse(str);
            IPEndPoint ipENdpoint = new IPEndPoint(ip, ports);

            serverSocket.Bind(ipENdpoint);
            //3.開啟監聽
            serverSocket.Listen(10);
            label5_Timer.Text = "開始監聽···";

            //4.開始接受客戶端的連結
            ThreadPool.QueueUserWorkItem(new WaitCallback(this.StartAcceptClient), serverSocket);


        }
        public void StartAcceptClient(object state)
        {
            var serverSocket = (Socket)state;
            this.AppendTextLog("伺服器開始接受客戶端的連結");
            while (true)
            {
                try
                {
                    Socket prosock = serverSocket.Accept();
                    //將遠端連結的客戶端的IP地址和socket存入集合中
                    dicSocket.Add(prosock.RemoteEndPoint.ToString(), prosock);
                    string ipPort = prosock.RemoteEndPoint.ToString();
                    MedicineDevice ns = new MedicineDevice();
                    SQLMachine j = new SQLMachine();
                   

                    j.MedicineDeviceStatus(ipPort, "線上");
                    //連結物件的資訊
                    string stinfo = prosock.RemoteEndPoint.ToString();
                    this.AppendTextLog(string.Format("客戶端{0}連結上了", stinfo));

                    ClientProSocketList.Add(prosock);
                    //伺服器接收客戶端的訊息
                    ThreadPool.QueueUserWorkItem(new WaitCallback(this.ReceiveData), prosock);
                }
                catch (Exception e)
                {
                    return;
                    //throw;
                }


            }
 

 public void ReceiveData(object obj)
        {
            var prosock = (Socket)obj;
            byte[] data = new byte[1024 * 1024];
            //方法返回代表實際接受的資料的長度
            while (true)
            {
                int realen = 0;
                try
                {
                    realen = prosock.Receive(data, 0, data.Length, SocketFlags.None);
                }
                catch (Exception e)
                {
                    //異常退出
                    AppendTextLog(string.Format("裝置 {0} 異常退出", prosock.RemoteEndPoint.ToString()));                  
                    StopCOnnecte(prosock);
                    return;
                }
                if (realen <= 0)
                {
                    //對方正常退出

                    AppendTextLog(string.Format("裝置 {0} 正常退出：", prosock.RemoteEndPoint.ToString()));
                
                      
                    }
                    prosock.Shutdown(SocketShutdown.Both);
                    prosock.Close();
                    ClientProSocketList.Remove(prosock);
                    return;
                }
                //接受到的資料
                string fromClientMsg = Encoding.Default.GetString(data, 0, realen);
                AppendTextLog(string.Format("接收到 {0} 的訊息是：{1}", prosock.RemoteEndPoint.ToString(), fromClientMsg));}}
 

  private void StopCOnnecte(Socket prosock)
        {
            try
            {
                if (prosock.Connected)
                {
                    prosock.Shutdown(SocketShutdown.Both);
                    prosock.Close(100);
                }
            }
            catch (Exception ex)
            {

            }
        }
 

 public void AppendTextLog(string txt)
        {
            if (textBox_Message.InvokeRequired)
            {
                textBox_Message.BeginInvoke(new Action<string>(s =>
                {
                    this.textBox_Message.Text = string.Format("{0}\r\n{1}", s, textBox_Message.Text);
                }
                    ), txt);
                //同步方法
                //textBox_Message.Invoke(new Action<string>(s =>
                //    {
                //        this.textBox_Message.Text = string.Format("{0}\r\n{1}", s, textBox_Message.Text);
                //    }
                //    ), txt);
            }
            else
            {
                this.textBox_Message.Text = string.Format("{0}\r\n{1}", txt, textBox_Message.Text);
            }
        }