Pracowałem nad wdrożeniem ESC / POS (standardowego kodu Epsona dla punktu sprzedaży) na drukarce kuchennej (Aclas KP71M).
Mam interfejs użytkownika, który użytkownik POS wprowadza swój ciąg znaków do interfejsu użytkownika, a ciągi wprowadzone przez użytkownika zostaną wysłane do drukarki, a drukarka wydrukuje dane.
Drukarka współpracuje z komputerem hosta za pomocą Ethernetu (100M) przy użyciu połączenia TCP / IP.
Udało mi się osadzić wszystkie niezbędne polecenia w metodzie C #, a także pobrać przykładowy kod na połączenie C # z serwerem / klientem i próbowałem dołączyć to do mojego połączenia.
Problem, przed którym teraz stoję, polega na tym, że mój kod wydaje się uruchamiać połączenie, ale zawiesza się natychmiast, nie robiąc nic i zatrzymując połączenie. Byłbym bardzo wdzięczny, gdyby ktoś mógł mnie poprawić lub pokazać, gdzie jest problem, lub daj mi jakiś pomysł, jak postępować?
Oto kod.

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Sockets;

namespace ESC_POS
{
   public partial class Form1 : Form
   {
        public string tableNumber;
        public string itemOrdered;
        public string orderedQuantity;
        public string waiterName;
        public string orderDestination;
        public string orderNumber;

        const int MAX_CLIENTS = 10;

        public AsyncCallback pfnWorkerCallBack;
        private Socket m_mainSocket;
        private Socket[] m_workerSocket = new Socket[10];
        private int m_clientCount = 0;//Server declarations

        byte[] m_dataBuffer = new byte[10];
        IAsyncResult m_result;
        public AsyncCallback m_pfnCallBack;
        public Socket m_clientSocket;//Client declarations

        public Form1()
        {
            InitializeComponent();
            PC_IP.Text = GetIP();
            PRINTER_IP.Text = GetIP();
        }

        public void label1_Click(object sender, EventArgs e)
        {
        }

        public void Form1_Load(object sender, EventArgs e)
        {
        }   

        public void TableNumber_TextChanged(object sender, EventArgs e)
        {
            if (TableNumber.Text == "")
            {
                MessageBox.Show("Please enter the table number");
                return;
            }
            tableNumber = TableNumber.Text;
        }

        public void OrderedQuantitiy_TextChanged(object sender, EventArgs e)
        {
            if (OrderedQuantitiy.Text == "")
            {
                MessageBox.Show("Please enter the ordered quantity");
                return;
            }
            orderedQuantity = OrderedQuantitiy.Text;
        }

        public void WaiterName_TextChanged(object sender, EventArgs e)
        {
            if (WaiterName.Text == "")
            {
                MessageBox.Show("Please enter the waiter name");
                return;
            }
            waiterName = WaiterName.Text;
        }

        public void comboOrderDestination_SelectedIndexChanged(object sender, EventArgs e)
        {

            if (ItemOrdered.Text == "")
            {
                MessageBox.Show("Please select the order destiination");
                return;
            }
            orderDestination = comboOrderDestination.SelectedText;
        }

        public void OrderNumber_TextChanged(object sender, EventArgs e)
        {
            if (OrderNumber.Text == "")
            {
                MessageBox.Show("Please enter the order number");
                return;
            }
            orderNumber = OrderNumber.Text;
        }

        public void PrintButton_Click(object sender, EventArgs e)
        {
            try
            {   
                string[] printData = new string[6];
                printData[0]=tableNumber ;
                printData[1]= itemOrdered;
                printData[2]= orderedQuantity;
                printData[3]= waiterName;
                printData[4]= orderDestination;
                printData[5]= orderNumber;
                string richTextMessage = "";
                PrinterCommands printCmd = new PrinterCommands();
                printCmd.initializePrinter();
                PrinterCommands print = new PrinterCommands();

                for (int i = 0; i < printData.Length; i++)
                {
                    richTextMessage = printData[i]+" ";
                    richTextMessage = print.LineFeed().ToString();
                }
                Object objData = richTextMessage;


                byte[] byData = System.Text.Encoding.ASCII.GetBytes(objData.ToString());
                if (m_clientSocket != null)
                {
                    m_clientSocket.Send(byData);
                }
            }
            catch (SocketException se)
            {
                MessageBox.Show(se.Message);
            }
        }

        public void textBox1_TextChanged(object sender, EventArgs e)
        {
        }

        public void PC_PORT_TextChanged(object sender, EventArgs e)
        {
        }

        public void PRINTER_IP_TextChanged(object sender, EventArgs e)
        {
        }

        public void PRINTER_PORT_TextChanged(object sender, EventArgs e)
        {
        }

        public void Connect_toPC_Click(object sender, EventArgs e)
        {
            // See if we have text on the IP and Port text fields
            // See if we have text on the IP and Port text fields
            if (PRINTER_IP.Text == "" || PRINTER_PORT.Text == "")
            {
                MessageBox.Show("IP Address and Port Number are required to connect to the Server\n");
                return;
            }
            try
            {
                UpdateControlsPrinter(false);
                // Create the socket instance
                m_clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

                // Cet the remote IP address
                IPAddress ip = IPAddress.Parse(PRINTER_IP.Text);
                int iPortNo = System.Convert.ToInt16(PRINTER_PORT.Text);
                // Create the end point 
                IPEndPoint ipEnd = new IPEndPoint(ip, iPortNo);
                // Connect to the remote host
                m_clientSocket.Connect(ipEnd);
                if (m_clientSocket.Connected)
                {

                    UpdateControlsPrinter(true);
                    //Wait for data asynchronously 
                    WaitForData();
                }
            }
            catch (SocketException se)
            {
                string str;
                str = "\nConnection failed, is the server running?\n" + se.Message;
                MessageBox.Show(str);
                UpdateControlsPrinter(false);
            }       
        }

        public void ItemOrdered_TextChanged_1(object sender, EventArgs e)
        {
            if (ItemOrdered.Text == "")
            {
                MessageBox.Show("Please enter the Item Ordered");
                return;
            }
        }

        public void Disconnect_toPC_Click(object sender, EventArgs e)
        {

            if (m_clientSocket != null)
            {
                m_clientSocket.Close();
                m_clientSocket = null;
             UpdateControlsPrinter(false);
            }
            Close();
        }

        public void Start_Listening_Click(object sender, EventArgs e)
        {
            try
            {
                // Check the port value
                if (PC_PORT.Text == "")
                {
                    MessageBox.Show("Please enter a Port Number");
                    return;
                }
                string portStr = PC_PORT.Text;
                int port = System.Convert.ToInt32(portStr);
                // Create the listening socket...
                m_mainSocket = new Socket(AddressFamily.InterNetwork,
                                          SocketType.Stream,
                                          ProtocolType.Tcp);
                IPEndPoint ipLocal = new IPEndPoint(IPAddress.Any, port);
                // Bind to local IP Address...
                m_mainSocket.Bind(ipLocal);
                // Start listening...
                m_mainSocket.Listen(4);
                // Create the call back for any client connections...
                m_mainSocket.BeginAccept(new AsyncCallback(OnClientConnect), null);

                UpdateControls(true);

            }
            catch (SocketException se)
            {
                MessageBox.Show(se.Message);
            }
        }

        public void Stop_Listening_Click(object sender, EventArgs e)
        {
            CloseSockets();
            UpdateControls(false);
            Close();
        }

        String GetIP()
        {
            String strHostName = Dns.GetHostName();

            // Find host by name
            IPHostEntry iphostentry = Dns.GetHostByName(strHostName);

            // Grab the first IP addresses
            String IPStr = "";
            foreach (IPAddress ipaddress in iphostentry.AddressList)
            {
                IPStr = ipaddress.ToString();
                return IPStr;
            }
            return IPStr;
        }

        public void CloseSockets()
        {
            if (m_mainSocket != null)
            {
                m_mainSocket.Close();
            }
            for (int i = 0; i < m_clientCount; i++)
            {
                if (m_workerSocket[i] != null)
                {
                    m_workerSocket[i].Close();
                    m_workerSocket[i] = null;
                }
            }
        }

        public void WaitForData()
        {
            try
            {
                if (m_pfnCallBack == null)
                {
                    m_pfnCallBack = new AsyncCallback(OnDataReceived);
                }
                SocketPacket theSocPkt = new SocketPacket();
              //          theSocPkt.thisSocket = m_clientSocket;
                // Start listening to the data asynchronously
                m_result = m_clientSocket.BeginReceive(theSocPkt.dataBuffer,
                                                        0, theSocPkt.dataBuffer.Length,
                                                        SocketFlags.None,
                                                        m_pfnCallBack,
                                                        theSocPkt);
            }
            catch (SocketException se)
            {
                MessageBox.Show(se.Message);
            }

        }

        public void WaitForData(System.Net.Sockets.Socket soc)
        {
            try
            {
                if (pfnWorkerCallBack == null)
                {
                    // Specify the call back function which is to be 
                    // invoked when there is any write activity by the 
                    // connected client
                    pfnWorkerCallBack = new AsyncCallback(OnDataReceived);
                }
                SocketPacket theSocPkt = new SocketPacket();
                theSocPkt.m_currentSocket = soc;
                // Start receiving any data written by the connected client
                // asynchronously
                soc.BeginReceive(theSocPkt.dataBuffer, 0,
                                   theSocPkt.dataBuffer.Length,
                                   SocketFlags.None,
                                   pfnWorkerCallBack,
                                   theSocPkt);
            }
            catch (SocketException se)
            {
                MessageBox.Show(se.Message);
            }
        }

        public class SocketPacket
        {
            public System.Net.Sockets.Socket m_currentSocket;
            public byte[] dataBuffer = new byte[1];
        }

        public void UpdateControlsPrinter(bool connected)
        {
            Connect_toPC.Enabled = !connected;
            Disconnect_toPC.Enabled = connected;
            string connectStatus = connected ? "Connected" : "Not Connected";
           // textBoxConnectStatus.Text = connectStatus;
        }

        public void UpdateControls(bool listening)
        {
            Start_Listening.Enabled = !listening;
            Stop_Listening.Enabled = listening;
        }

        public void OnDataReceived(IAsyncResult asyn)
        {
            try
            {
                SocketPacket socketData = (SocketPacket)asyn.AsyncState;

                int iRx = 0;
                // Complete the BeginReceive() asynchronous call by EndReceive() method
                // which will return the number of characters written to the stream 
                // by the client
                iRx = socketData.m_currentSocket.EndReceive(asyn);
                char[] chars = new char[iRx + 1];
                System.Text.Decoder d = System.Text.Encoding.UTF8.GetDecoder();
                int charLen = d.GetChars(socketData.dataBuffer,
                                         0, iRx, chars, 0);
                System.String szData = new System.String(chars);
              //  richTextBoxReceivedMsg.AppendText(szData);

                // Continue the waiting for data on the Socket
                WaitForData(socketData.m_currentSocket);
            }
            catch (ObjectDisposedException)
            {
                System.Diagnostics.Debugger.Log(0, "1", "\nOnDataReceived: Socket has been closed\n");
            }
            catch (SocketException se)
            {
                MessageBox.Show(se.Message);
            }
        }

        public void OnClientConnect(IAsyncResult asyn)
        {
            try
            {
                // Here we complete/end the BeginAccept() asynchronous call
                // by calling EndAccept() - which returns the reference to
                // a new Socket object
                m_workerSocket[m_clientCount] = m_mainSocket.EndAccept(asyn);
                // Let the worker Socket do the further processing for the 
                // just connected client
                WaitForData(m_workerSocket[m_clientCount]);
                // Now increment the client count
                ++m_clientCount;
                // Display this client connection as a status message on the GUI    
                String str = String.Format("Client # {0} connected", m_clientCount);
               // textBoxMsg.Text = str;

                // Since the main Socket is now free, it can go back and wait for
                // other clients who are attempting to connect
                m_mainSocket.BeginAccept(new AsyncCallback(OnClientConnect), null);
            }
            catch (ObjectDisposedException)
            {
                System.Diagnostics.Debugger.Log(0, "1", "\n OnClientConnection: Socket has been closed\n");
            }
            catch (SocketException se)
            {
                MessageBox.Show(se.Message);
            }
        }
    }
}