我有一个用户界面,POS用户将其字符串输入到用户界面,用户输入的字符串将被发送到打印机,打印机打印数据.
打印机与主机的接口使用以太网(100M)使用TCP / IP连接.我已经设法将每个必要的命令嵌入到C#方法中,我还在服务器/客户端C#上采用了一些示例代码
连接并尝试将其包含在我的连接中.
我现在面临的问题是我的代码似乎开始连接但它立即冻结
没有做任何事情并且停止了连接.如果有人可以纠正我,或者告诉我问题所在,或者让我知道如何继续,我将非常感激？
这是代码.
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,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,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,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,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,"\n OnClIEntConnection: Socket has been closed\n"); } catch (SocketException se) { MessageBox.Show(se.Message); } } }}解决方法 回答这个问题以防其他任何人出现同样的问题.这对我有用： Socket clIEntSock = new Socket(AddressFamily.InterNetwork,ProtocolType.Tcp);clIEntSock.NoDelay = true;IPAddress ip = IPAddress.Parse("192.168.0.18");IPEndPoint remoteEP = new IPEndPoint(ip,9100);clIEntSock.Connect(remoteEP);EnCoding enc = EnCoding.ASCII;// line Feed hexadecimal valuesbyte[] bEsc = new byte[4];bEsc[0] = 0x0A;bEsc[1] = 0x0A;bEsc[2] = 0x0A;bEsc[3] = 0x0A;// Send the bytes over clIEntSock.Send(bEsc);// Sends an ESC/POS command to the printer to cut the paperstring output = Convert.tochar(29) + "V" + Convert.tochar(65) + Convert.tochar(0);char[] array = output.tochararray();byte[] byData = enc.GetBytes(array);clIEntSock.Send(byData);clIEntSock.Close(); 总结 以上是内存溢出为你收集整理的c#-4.0 – 使用带有TCP / IP接口的C#中执行的ESC / POS命令直接打印到热敏打印机全部内容，希望文章能够帮你解决c#-4.0 – 使用带有TCP / IP接口的C#中执行的ESC / POS命令直接打印到热敏打印机所遇到的程序开发问题。
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