C# Socket Print sometimes no response?
题
I'm having some problems printing to our barcode printer. The codes are working fine but I can't instantly print another one but need to wait few seconds. Is there anything wrong with my codes?
thanks anyone in advance.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Text;
using System.Net;
using System.Net.Sockets;
namespace PrintToZebra
{
class Program
{
public static void Main(string[] args)
{
Console.WriteLine("start printing to: 10.160.2.254:9100");
string text = "^XA" +
"^FO335,22,^CI0^A0,14,14^FR^FDConta^FS" +
"^FO368,22,^CI0^A0,14,14^FR^FDins^FS" +
"^PQ1" +
"^XZ";
printToIP("10.160.2.254", 9100, text);
}
public static void printToIP(string ipAddress, int printerPort, string content)
{
try
{
EndPoint ep = new IPEndPoint(IPAddress.Parse(ipAddress), printerPort);
//EndPoint ep = new IPEndPoint(parseIP(ipAddress),printerPort);
Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
sock.Connect(ep);
NetworkStream ns = new NetworkStream(sock);
byte[] toSend = Encoding.ASCII.GetBytes(content);
ns.Write(toSend, 0, toSend.Length);
sock.Close();
}
catch(Exception ex)
{
Console.WriteLine(ex);
}
}
}
}
解决方案
Thanks Joachim. I have modified my code using BeginWrite instead of Write and get the problem solved.
public class PrintToZebra
{
public string printerIP { get; set; }
public int printerPort { get; set; }
public string myZPL { get; set; }
private EndPoint ep { get; set; }
private Socket sock { get; set; }
private NetworkStream ns { get; set; }
//private AsyncCallback callbackWrite;
public PrintToZebra()
{
printerIP = "";
printerPort = 0;
myZPL = "";
}
public PrintToZebra(string anIP, int aPort, string aZPL)
{
printerIP = anIP;
printerPort = aPort;
myZPL = aZPL;
}
public void printToIP()
{
ep = new IPEndPoint(IPAddress.Parse(printerIP), printerPort);
sock = new Socket(ep.AddressFamily, SocketType.Stream, ProtocolType.Tcp);
try
{
sock.Connect(ep);
ns = new NetworkStream(sock);
byte[] toSend = Encoding.ASCII.GetBytes(myZPL);
ns.BeginWrite(toSend, 0, toSend.Length, OnWriteComplete, null);
ns.Flush();
}
catch (Exception ex)
{
//Console.WriteLine(ex.ToString());
sock.Shutdown(SocketShutdown.Both);
sock.Close();
}
}
private void OnWriteComplete(IAsyncResult ar)
{
NetworkStream thisNS = ns;
thisNS.EndWrite(ar);
sock.Shutdown(SocketShutdown.Both);
sock.Close();
}
}
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