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/* Copyright (c) 2004, 2005 MySQL AB
Use is subject to license terms
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.IO;
namespace NDB_CPC.socketcomm
{
/// <summary>
/// Summary description for SocketComm.
/// </summary>
public class SocketComm
{
private myTcpClient sender;
private StreamWriter writer;
private StreamReader reader;
private string m_host;
private int m_port;
private bool m_connected;
private bool m_connecting;
private Thread connectThread;
public SocketComm(string host, int port)
{
m_host=host;
m_port=port;
m_connected=false;
m_connecting=false;
}
public bool isConnected()
{
return m_connected;
}
public void doConnect()
{
if(!m_connecting && !m_connected)
{
connectThread= new Thread(new ThreadStart(connect));
connectThread.Start();
}
}
private void connect()
{
m_connecting=true;
while(true)
{
if(!m_connected)
{
try
{
// Establish the remote endpoint for the socket.
// The name of the
// remote device is "host.contoso.com".
// Create a TCP/IP socket.
sender = new myTcpClient();
// Connect the socket to the remote endpoint. Catch any errors.
try
{
/*
IPAddress ipAddress = Dns.Resolve(host).AddressList[0];
IPEndPoint ipLocalEndPoint = new IPEndPoint(ipAddress, 11000);
*/
sender.Connect(m_host,m_port);;
writer = new StreamWriter(sender.GetStream(), Encoding.ASCII);
reader = new StreamReader(sender.GetStream(), Encoding.ASCII);
m_connected=true;
m_connecting=false;
// break;
Console.WriteLine("Socket connected to {0}",
sender.ToString());
}
catch (ArgumentNullException ane)
{
Console.WriteLine("ArgumentNullException : {0}",ane.ToString());
m_connected=false;
}
catch (SocketException se)
{
Console.WriteLine("SocketException : {0}",se.ToString());
m_connected=false;
}
}
catch (Exception e)
{
Console.WriteLine("Unexpected exception : {0}", e.ToString());
m_connected=false;
}
}
Thread.Sleep(200);
}
}
public bool disconnect()
{
try
{
this.m_connected=false;
this.m_connecting=false;
sender.GetUnderlyingSocket().Shutdown(SocketShutdown.Both);
sender.GetUnderlyingSocket().Close();
writer.Close();
reader.Close();
sender.Close();
}
catch (ArgumentNullException ane)
{
Console.WriteLine("ArgumentNullException : {0}",ane.ToString());
connectThread.Abort();
return false;
}
catch (SocketException se)
{
Console.WriteLine("SocketException : {0}",se.ToString());
connectThread.Abort();
return false;
}
catch (Exception e)
{
Console.WriteLine("Unexpected exception : {0}", e.ToString());
connectThread.Abort();
return false;
}
connectThread.Abort();
return true;
}
public bool writeMessage(string message)
{
int attempts=0;
while (attempts < 10)
{
try
{
writer.WriteLine(message);
writer.Flush();
message="";
return true;
}
catch(IOException e)
{
this.disconnect();
this.doConnect();
Thread.Sleep(200);
attempts++;
}
catch(System.NullReferenceException)
{
this.disconnect();
this.doConnect();
Thread.Sleep(200);
attempts++;
}
}
return false;
}
public string readLine()
{
int attempts=0;
string line="";
while (attempts < 10){
try
{
line = reader.ReadLine();
if(line==null)
line="";
return line;
}
catch(IOException e)
{
this.disconnect();
this.doConnect();
Thread.Sleep(400);
attempts++;
}
catch(System.NullReferenceException)
{
this.disconnect();
this.doConnect();
Thread.Sleep(400);
attempts++;
}
}
return "";
}
}
}
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