Question

I’m comunicationg with a email gateway. That gateway has an specific ip and port.

The requests the gateway are JSON formated and the gateway normally responds first whith an proceeding state and then with a confirmation or error state, represented also in JSON.

The code to make the requests and receive the response is:

using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Collections.Generic;
using System.Threading;

using Microsoft.Win32;

public class TcpClientSample
{
    public static void SendMessage(TcpClient client, string msg)
    {
        Console.WriteLine("REQUEST:" + msg);

        NetworkStream stream = client.GetStream();

        byte[] myWriteBuffer = Encoding.ASCII.GetBytes(msg);
        stream.Write(myWriteBuffer, 0, myWriteBuffer.Length);

        byte[] myWriteBuffer2 = Encoding.ASCII.GetBytes("\r\n");
        stream.Write(myWriteBuffer2, 0, myWriteBuffer2.Length);

        string gResponse = "";
        BinaryReader r = new BinaryReader(stream);        

        int receivedMessages = 0;
        while (true)
        {     
            while (true)
            {
                char currentChar = r.ReadChar();
                if (currentChar == '\n')
                    break;
                else
                    gResponse = gResponse + currentChar;
            }           

            if (gResponse != "")
            {
                Console.WriteLine("RESPONSE:" + gResponse);
                receivedMessages = receivedMessages + 1;    
            }

            if (receivedMessages == 2)
            {   
                break;
            }

        }        
    }

    public static void Main()
    {
        List<string> messages = new List<string>();        

        for (int i = 0; i < 1; i++)
        {
            String msg = "{ \"user\" : \"James\", \"email\" : \"[e-mail]\" }";
            messages.Add(msg);
        }

        TcpClient client = new TcpClient();

        client.Connect("someIp", somePort);

        int sentMessages = 0;
        int receivedMessages = 0;
        foreach (string msg in messages)
        {
            Thread newThread = new Thread(() =>
            {
                sentMessages = sentMessages + 1;
                Console.WriteLine("SENT MESSAGES: " + sentMessages);
                SendMessage(client, msg);
                receivedMessages = receivedMessages + 1;
                Console.WriteLine("RECEIVED MESSAGES: " + receivedMessages);                
            });            
            newThread.Start();

        }        

        Console.ReadLine();
    }
}

If I send few emails (up to 10) the network stream is OK.

But if I send thousands of emails I get messed chars lie

:{iyo”asn ooyes” “ncd” 0,”s_d:”4379″ nme” 92729,”er_u” ,”ed_t_i” 2#” p cin_d:”921891010-11:11.725,”s” 4663175D0105E6912ADAAFFF6FDA393367″ rpy:”rcein”

Why is this?

Don’t worry I’m not a spammer 😀

Answer 1

I solved this issue by having a single method just to read from the stream like this:

private TcpClient client;
private NetworkStream stream;

public void ListenFromGateway()
{
   ...
   while (true)
      {
         byte[] bytes = new byte[client.ReceiveBufferSize];

         //BLOCKS UNTIL AT LEAST ONE BYTE IS READ
         stream.Read(bytes, 0, (int)client.ReceiveBufferSize);

         //RETURNS THE DATA RECEIVED 
         string returndata = Encoding.UTF8.GetString(bytes);

         //REMOVE THE EXCEDING CHARACTERS STARTING ON \r
         string returndata = returndata.Remove(returndata.IndexOf('\r'));

         ...
}

Thanks for the help