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Index was out of range. Must be non-negative and less than the size of the collection????

Posted on 2008-06-15
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1,418 Views
Last Modified: 2013-11-29
my log gave me that error.
i am using ftp.
what is the problem?
Message: Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
Stack:    at System.Collections.ArrayList.get_Item(Int32 index)
   at FTPClient.FTPConnection.Read()
   at FTPClient.FTPConnection.SendCommand(String command)
   at FTPClient.FTPConnection.Open(String remoteHost, Int32 remotePort, String user, String password, FTPMode pMode)
   at FTPClient.FTPConnection.Open(String remoteHost, String user, String password, FTPMode mode)
   at eserServicesLibrary.Helpers.FtpHandler.Connect()
   at ScheduleMoverLibrary.ScheduleMover.Move(Object obj)
[15/06/2008 20:31:12],[4],[Information],oa: Local to Remote
[15/06/2008 20:31:14],[4],[Error],Exception System.Exception
Message: 230 User 512528 logged in.
Stack:    at FTPClient.FTPConnection.SetCurrentDirectory(String remotePath)
   at eserServicesLibrary.Helpers.FtpHandler.IsFileExists(String path)
   at ScheduleMoverLibrary.ScheduleMover.Move(Object obj)
[15/06/2008 20:31:14],[4],[Information],ScheduleMover:Move():oa oa fa: End
[15/06/2008 20:31:14],[4],[Information],ScheduleMover:Move():oa oa dod: Start
[15/06/2008 20:31:14],[4],[Information],oa: Remote to Local
[15/06/2008 20:31:24],[4],[Error],Exception System.Exception
Message: Server does not return message to the message
Stack:    at FTPClient.FTPConnection.Read()
   at FTPClient.FTPConnection.Open(String remoteHost, Int32 remotePort, String user, String password, FTPMode pMode)
   at FTPClient.FTPConnection.Open(String remoteHost, String user, String password, FTPMode mode)
   at eserServicesLibrary.Helpers.FtpHandler.Connect()
   at ScheduleMoverLibrary.ScheduleMover.Move(Object obj)

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Question by:Forrest_Gump
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2 Comments
 
LVL 18

Accepted Solution

by:
Matthew Kelly earned 500 total points
ID: 21790528
The error is in the code that performs the ftp, not the ftp transaction itself

See if any of these help, or post the code that causes the error.

http://www.experts-exchange.com/Programming/Programming_Languages/Dot_Net/ASP_DOT_NET/Q_21872278.html
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Author Comment

by:Forrest_Gump
ID: 21801145
You sent me link of array exception..
I am talking about thr read method of FTPConnection class.

I attached the class.
using System;
using System.Net;
using System.IO;
using System.Text;
using System.Net.Sockets;
using System.Collections;
using System.Data;
using System.Threading;
 
namespace FTPClient
{
	/// <summary>
	/// Summary description for FTPConnection.
	/// </summary>
 
	public class FTPConnection
	{		
		private TcpClient tcpClient;
		private static int BLOCK_SIZE = 512;
		private static int DEFAULT_REMOTE_PORT = 21;
		private static int DATA_PORT_RANGE_FROM = 1500;
		private static int DATA_PORT_RANGE_TO = 65000;
		private FTPMode mode;
		private int activeConnectionsCount;
		private string remoteHost;
 
		private ArrayList messageList = new ArrayList();
		private bool logMessages;
 
		public FTPConnection()
		{
			this.activeConnectionsCount = 0;
			this.mode = FTPMode.Active;
			this.logMessages = false;
		}
 
		public ArrayList MessageList
		{
			get
			{
				return this.messageList;
			}
		}
 
		public bool LogMessages
		{
			get
			{
				return this.logMessages;
			}
 
			set
			{
				if(!value)
				{
					this.messageList = new ArrayList();
				}
 
				this.logMessages = value;
			}
		}
 
		public virtual void Open(string remoteHost, string user, string password)
		{
			Open(remoteHost, DEFAULT_REMOTE_PORT, user, password, FTPMode.Active);
		}
 
		public virtual void Open(string remoteHost, string user, string password, FTPMode mode)
		{
			Open(remoteHost, DEFAULT_REMOTE_PORT, user, password, mode);
		}
 
		public virtual void Open(string remoteHost, int remotePort, string user, string password)
		{
			Open(remoteHost, remotePort, user, password, FTPMode.Active);
		}
		
		public virtual void Open(string remoteHost, int remotePort, string user, string password, FTPMode pMode)
		{
			ArrayList tempMessageList = new ArrayList();
			int returnValue;
 
			this.mode = pMode;
			this.tcpClient = new TcpClient();
			this.remoteHost = remoteHost;
 
			// As we cannot detect the local address from the TCPClient class, convert "127.0.0.1" and "localhost" to
            // the DNS record of this machine; this will ensure that the connection address and the PORT command address
            // are identical.  This fixes bug 854919.
			if (remoteHost == "localhost" || remoteHost == "127.0.0.1")
			{
				remoteHost = GetLocalAddressList()[0].ToString();
			}
 
			//CONNECT
			try
			{
				this.tcpClient.Connect(remoteHost, remotePort);
			}
			catch(Exception)
			{
				throw new IOException("Couldn't connect to remote server");
			}
			tempMessageList = Read();
			returnValue = GetMessageReturnValue((string)tempMessageList[0]);
			if(returnValue != 220)
			{
				Close();
				throw new Exception((string)tempMessageList[0]);
			}
 
			//SEND USER
			tempMessageList = SendCommand("USER " + user);
			returnValue = GetMessageReturnValue((string)tempMessageList[0]);
			if(!(returnValue == 331 || returnValue == 202))
			{
				Close();
				throw new Exception((string)tempMessageList[0]);
			}
 
			//SEND PASSWORD
			if(returnValue == 331)
			{
				tempMessageList = SendCommand("PASS " + password);
				returnValue = GetMessageReturnValue((string)tempMessageList[0]);
				if(!(returnValue == 230 || returnValue == 202))
				{
					Close();
					throw new Exception((string)tempMessageList[0]);
				}
			}
		}
 
		public virtual void Close()
		{
			ArrayList messageList = new ArrayList();
 
			if(this.tcpClient != null )
			{
				messageList = SendCommand("QUIT");
				this.tcpClient.Close();
			}
		}
 
		public ArrayList Dir(String mask)
		{
			ArrayList tmpList = Dir();
 
			DataTable table = new DataTable();
			table.Columns.Add("Name");
			for(int i = 0; i < tmpList.Count; i++)
			{
				DataRow row = table.NewRow();
				row["Name"] = (string)tmpList[i];
				table.Rows.Add(row);
			}
 
			DataRow [] rowList = table.Select("Name LIKE '" + mask + "'", "", DataViewRowState.CurrentRows);
			tmpList = new ArrayList();
			for(int i = 0; i < rowList.Length; i++)
			{
				tmpList.Add((string)rowList[i]["Name"]);
			}
 
			return tmpList;
		}
		
		public ArrayList Dir()
		{
			LockTcpClient();
			TcpListener listner = null;
			TcpClient client = null;
			NetworkStream networkStream = null;
			ArrayList tempMessageList = new ArrayList();
			int returnValue = 0;
			string returnValueMessage = "";
			ArrayList fileList = new ArrayList();
 
			SetTransferType(FTPFileTransferType.ASCII);
 
			if(this.mode == FTPMode.Active)
			{
				listner = CreateDataListner();
				listner.Start();
			}
			else
			{
				client = CreateDataClient();
			}
 
			tempMessageList = new ArrayList();
			tempMessageList = SendCommand("NLST");
			returnValue = GetMessageReturnValue((string)tempMessageList[0]);
			if(!(returnValue == 150 || returnValue == 125 || returnValue == 550))
			{
				throw new Exception((string)tempMessageList[0]);
			}
 
			if(returnValue == 550) //No files found
			{
				return fileList;
			}
 
			if(this.mode == FTPMode.Active)
			{
				client = listner.AcceptTcpClient();
			}
			networkStream = client.GetStream();
 
			fileList = ReadLines(networkStream);
 
			if(tempMessageList.Count == 1)
			{
				tempMessageList = Read();
				returnValue = GetMessageReturnValue((string)tempMessageList[0]);
				returnValueMessage = (string)tempMessageList[0];
			}
			else
			{
				returnValue = GetMessageReturnValue((string)tempMessageList[1]);
				returnValueMessage = (string)tempMessageList[1];
			}
 
			if(!(returnValue == 226))
			{
				throw new Exception(returnValueMessage);
			}
 
			networkStream.Close();
			client.Close();
 
			if(this.mode == FTPMode.Active)
			{
				listner.Stop();
			}
			UnlockTcpClient();
			return fileList;
		}
 
		public ArrayList XDir(String mask, int onColumnIndex)
		{
			ArrayList tmpList = XDir();
 
			DataTable table = new DataTable();
			table.Columns.Add("Name");
			for(int i = 0; i < tmpList.Count; i++)
			{
				DataRow row = table.NewRow();
				row["Name"] = (string)((ArrayList)tmpList[i])[onColumnIndex];
				table.Rows.Add(row);
			}
 
			DataRow [] rowList = table.Select("Name LIKE '" + mask + "'", "", DataViewRowState.CurrentRows);
			ArrayList newList = new ArrayList();
			for(int i = 0; i < rowList.Length; i++)
			{
				for(int j = 0; j < tmpList.Count; j++)
				{
					if((string)rowList[i]["Name"] == (string)((ArrayList)tmpList[j])[onColumnIndex])
					{
						newList.Add((ArrayList)tmpList[j]);
					}
				}
			}
 
			return newList;
		}
 
		public ArrayList XDir()
		{
			LockTcpClient();
			TcpListener listner = null;
			TcpClient client = null;
			NetworkStream networkStream = null;
			ArrayList tempMessageList = new ArrayList();
			int returnValue = 0;
			string returnValueMessage = "";
			ArrayList filesAndFolderList = new ArrayList();
			ArrayList tmpFilesAndFolderList = new ArrayList();
 
			SetTransferType(FTPFileTransferType.ASCII);
 
			if(this.mode == FTPMode.Active)
			{
				listner = CreateDataListner();
				listner.Start();
			}
			else
			{
				client = CreateDataClient();
			}
 
			tempMessageList = new ArrayList();
			tempMessageList = SendCommand("LIST");
			returnValue = GetMessageReturnValue((string)tempMessageList[0]);
			if(!(returnValue == 150 || returnValue == 125))
			{
				throw new Exception((string)tempMessageList[0]);
			}
 
			if(this.mode == FTPMode.Active)
			{
				client = listner.AcceptTcpClient();
			}
			networkStream = client.GetStream();
 
			tmpFilesAndFolderList = ReadLines(networkStream);
 
			if(tempMessageList.Count == 1)
			{
				tempMessageList = Read();
				returnValue = GetMessageReturnValue((string)tempMessageList[0]);
				returnValueMessage = (string)tempMessageList[0];
			}
			else
			{
				returnValue = GetMessageReturnValue((string)tempMessageList[1]);
				returnValueMessage = (string)tempMessageList[1];
			}
 
			if(!(returnValue == 226))
			{
				throw new Exception(returnValueMessage);
			}
 
			networkStream.Close();
			client.Close();
 
			if(this.mode == FTPMode.Active)
			{
				listner.Stop();
			}
 
			UnlockTcpClient();
			foreach(string s in tmpFilesAndFolderList)
			{
				filesAndFolderList.Add(this.GetTokens(s, " "));
			}
			return filesAndFolderList;
		}
 
		public void SendStream(Stream stream, string remoteFileName, FTPFileTransferType type)
		{
			LockTcpClient();
			TcpListener listner = null;
			TcpClient client = null;
			NetworkStream networkStream = null;
			ArrayList tempMessageList = new ArrayList();
			int returnValue = 0;
			string returnValueMessage = "";
			tempMessageList = new ArrayList();
 
			SetTransferType(type);
 
			if(this.mode == FTPMode.Active)
			{
				listner = CreateDataListner();
				listner.Start();
			}
			else
			{
				client = CreateDataClient();
			}
 
			tempMessageList = SendCommand("STOR " + remoteFileName);
			returnValue = GetMessageReturnValue((string)tempMessageList[0]);
			if(!(returnValue == 150 || returnValue == 125))
			{
				throw new Exception((string)tempMessageList[0]);
			}
 
			if(this.mode == FTPMode.Active)
			{
				client = listner.AcceptTcpClient();
			}
 
			networkStream = client.GetStream();
 
			Byte[] buffer = new Byte[BLOCK_SIZE];
			int bytes = 0;
			int totalBytes = 0;
 
			while(totalBytes < stream.Length)
			{
				bytes = (int)stream.Read(buffer, 0, BLOCK_SIZE);
				totalBytes = totalBytes + bytes;
				networkStream.Write(buffer, 0, bytes);
			}
 
			networkStream.Close();
			client.Close();
 
			if(this.mode == FTPMode.Active)
			{
				listner.Stop();
			}
 
			if(tempMessageList.Count == 1)
			{
				tempMessageList = Read();
				returnValue = GetMessageReturnValue((string)tempMessageList[0]);
				returnValueMessage = (string)tempMessageList[0];
			}
			else
			{
				returnValue = GetMessageReturnValue((string)tempMessageList[1]);
				returnValueMessage = (string)tempMessageList[1];
			}
 
			if(!(returnValue == 226))
			{
				throw new Exception(returnValueMessage);
			}
			UnlockTcpClient();
		}
 
		public virtual void SendFile(string localFileName, FTPFileTransferType type)
		{
			SendFile(localFileName, Path.GetFileName(localFileName), type);
		}
 
		public virtual void SendFile(string localFileName, string remoteFileName, FTPFileTransferType type)
		{
			FileStream fs = new FileStream(localFileName,FileMode.Open);
			SendStream(fs, remoteFileName, type);
			fs.Close();
		}
 
		public void GetStream(string remoteFileName, Stream stream, FTPFileTransferType type)
		{
			TcpListener listner = null;
			TcpClient client = null;
			NetworkStream networkStream = null;
			ArrayList tempMessageList = new ArrayList();
			int returnValue = 0;
			string returnValueMessage = "";
 
			LockTcpClient();
 
			SetTransferType(type);
 
			if(this.mode == FTPMode.Active)
			{
				listner = CreateDataListner();
				listner.Start();
			}
			else
			{
				client = CreateDataClient();
			}
 
			tempMessageList = new ArrayList();
			tempMessageList = SendCommand("RETR " + remoteFileName);
			returnValue = GetMessageReturnValue((string)tempMessageList[0]);
			if(!(returnValue == 150 || returnValue == 125))
			{
				throw new Exception((string)tempMessageList[0]);
			}
 
			if(this.mode == FTPMode.Active)
			{
				client = listner.AcceptTcpClient();
			}
 
			networkStream = client.GetStream();
 
			Byte[] buffer = new Byte[BLOCK_SIZE];
			int bytes = 0;
 
			bool read = true;
			while(read)
			{
				bytes = (int)networkStream.Read(buffer, 0, buffer.Length);
				stream.Write(buffer, 0, bytes);
				if(bytes == 0)
				{
					read = false;
				}
			}
 
			networkStream.Close();
			client.Close();
 
			if(this.mode == FTPMode.Active)
			{
				listner.Stop();
			}
 
			if(tempMessageList.Count == 1)
			{
				tempMessageList = Read();
				returnValue = GetMessageReturnValue((string)tempMessageList[0]);
				returnValueMessage = (string)tempMessageList[0];
			}
			else
			{
				returnValue = GetMessageReturnValue((string)tempMessageList[1]);
				returnValueMessage = (string)tempMessageList[1];
			}
 
			if(!(returnValue == 226))
			{
				throw new Exception(returnValueMessage);
			}
 
			UnlockTcpClient();
		}
		
		public virtual void GetFile(string remoteFileName, FTPFileTransferType type)
		{
			GetFile(remoteFileName, Path.GetFileName(remoteFileName), type);
		}
 
		public virtual void GetFile(string remoteFileName, string localFileName, FTPFileTransferType type)
		{
			FileStream fs = new FileStream(localFileName,FileMode.Create);
			GetStream(remoteFileName, fs, type);
			fs.Close();
		}
 
		public virtual void DeleteFile(String remoteFileName)
		{
			System.Threading.Monitor.Enter(this.tcpClient);
			ArrayList tempMessageList = new ArrayList();
			int returnValue = 0;
			tempMessageList = SendCommand("DELE " + remoteFileName);
			returnValue = GetMessageReturnValue((string)tempMessageList[0]);
			if(returnValue != 250)
			{
				throw new Exception((string)tempMessageList[0]);
			}
			System.Threading.Monitor.Exit(this.tcpClient);
		}
 
		
		public virtual void MoveFile(string remoteFileName, string toRemotePath)
		{
			if(toRemotePath.Length > 0 && toRemotePath.Substring(toRemotePath.Length - 1, 1) != "/")
			{
				toRemotePath = toRemotePath + "/";
			}
 
			RenameFile(remoteFileName, toRemotePath + remoteFileName);
		}
		
		public virtual void RenameFile(string fromRemoteFileName, string toRemoteFileName)
		{
			System.Threading.Monitor.Enter(this.tcpClient);
			ArrayList tempMessageList = new ArrayList();
			int returnValue = 0;
			tempMessageList = SendCommand("RNFR " + fromRemoteFileName);
			returnValue = GetMessageReturnValue((string)tempMessageList[0]);
			if(returnValue != 350)
			{
				throw new Exception((string)tempMessageList[0]);
			}
			tempMessageList = SendCommand("RNTO " + toRemoteFileName);
			returnValue = GetMessageReturnValue((string)tempMessageList[0]);
			if(returnValue != 250)
			{
				throw new Exception((string)tempMessageList[0]);
			}
			System.Threading.Monitor.Exit(this.tcpClient);
		}
 
		public virtual void SetCurrentDirectory(String remotePath)
		{
			LockTcpClient();
 
			ArrayList tempMessageList = new ArrayList();
			int returnValue = 0;
			tempMessageList = SendCommand("CWD " + remotePath);
			returnValue = GetMessageReturnValue((string)tempMessageList[0]);
			if(returnValue != 250)
			{
				throw new Exception((string)tempMessageList[0]);
			}
			UnlockTcpClient();
		}
		
		private void SetTransferType(FTPFileTransferType type)
		{
			switch (type)
			{
				case FTPFileTransferType.ASCII:
					SetMode("TYPE A");
					break;
				case FTPFileTransferType.Binary:
					SetMode("TYPE I");
					break;
				default:
					throw new Exception("Invalid File Transfer Type");
			}
		}
 
		private void SetMode(string mode)
		{
			LockTcpClient();
 
			ArrayList tempMessageList = new ArrayList();
			int returnValue = 0;
			tempMessageList = SendCommand(mode);
			returnValue = GetMessageReturnValue((string)tempMessageList[0]);
			if(returnValue != 200)
			{
				throw new Exception((string)tempMessageList[0]);
			}
			UnlockTcpClient();
		}
		
		private TcpListener CreateDataListner()
		{
			int port = GetPortNumber();
			SetDataPort(port);
 
			IPHostEntry localHost = Dns.Resolve( Dns.GetHostName() ); 
			TcpListener listner = new TcpListener(localHost.AddressList[0], port); 
			
			//TcpListener listner = new TcpListener(port);
			return listner; 
		}
		
		private TcpClient CreateDataClient()
		{
			int port = GetPortNumber();
 
			//IPEndPoint ep = new IPEndPoint(GetLocalAddressList()[0], port);
 
			TcpClient client = new TcpClient();
 
			//client.Connect(ep);
			client.Connect(this.remoteHost, port);
 
			return client;
		}
		
		private void SetDataPort(int portNumber)
		{
			LockTcpClient();
 
			ArrayList tempMessageList = new ArrayList();
			int returnValue = 0;
			int portHigh = portNumber >> 8;
			int portLow = portNumber & 255;
 
			tempMessageList = SendCommand("PORT " 
				+ GetLocalAddressList()[0].ToString().Replace(".", ",")
				+ "," + portHigh.ToString() + "," + portLow);
 
			returnValue = GetMessageReturnValue((string)tempMessageList[0]);
			if(returnValue != 200)
			{
				throw new Exception((string)tempMessageList[0]);
			}
			UnlockTcpClient();
 
		}
 
		public virtual void MakeDir(string directoryName)
		{
			LockTcpClient();
 
			ArrayList tempMessageList = new ArrayList();
			int returnValue = 0;
 
			tempMessageList = SendCommand("MKD " + directoryName);
			returnValue = GetMessageReturnValue((string)tempMessageList[0]);
			if(returnValue != 257)
			{
				throw new Exception((string)tempMessageList[0]);
			}
 
			UnlockTcpClient();
		}
 
		public virtual void RemoveDir(string directoryName)
		{
			LockTcpClient();
 
			ArrayList tempMessageList = new ArrayList();
			int returnValue = 0;
 
			tempMessageList = SendCommand("RMD " + directoryName);
			returnValue = GetMessageReturnValue((string)tempMessageList[0]);
			if(returnValue != 250)
			{
				throw new Exception((string)tempMessageList[0]);
			}
 
			UnlockTcpClient();
		}
 
		public ArrayList SendCommand(String command)
		{
			NetworkStream stream = this.tcpClient.GetStream();
			this.activeConnectionsCount++;
 
			Byte[] cmdBytes = Encoding.ASCII.GetBytes((command+"\r\n").ToCharArray());
			stream.Write(cmdBytes, 0, cmdBytes.Length);
 
			this.activeConnectionsCount--;
 
			return Read();
		}
 
		private ArrayList Read ()
		{
			NetworkStream stream = this.tcpClient.GetStream();
			ArrayList messageList = new ArrayList();
			ArrayList tempMessage = ReadLines(stream);
 
			int tryCount = 0;
			while(tempMessage.Count == 0)
			{
				if(tryCount == 10)
				{
					throw new Exception("Server does not return message to the message");
				}
 
				Thread.Sleep(1000);
				tryCount++;
				tempMessage = ReadLines(stream);
			}
 
			while(((string)tempMessage[tempMessage.Count - 1]).Substring(3, 1) == "-")
			{
				messageList.AddRange(tempMessage);
				tempMessage = ReadLines(stream);
			}
			messageList.AddRange(tempMessage);
 
			AddMessagesToMessageList(messageList);
 
			return messageList;
		}
		
		private ArrayList ReadLines(NetworkStream stream)
		{
			ArrayList messageList = new ArrayList();
			char[] seperator = {'\n'};
			char[] toRemove = {'\r'};
			Byte[] buffer = new Byte[BLOCK_SIZE];
			int bytes = 0;
			string tmpMes = "";
 
			while(stream.DataAvailable)
			{
				bytes = stream.Read(buffer, 0, buffer.Length);
				tmpMes += Encoding.ASCII.GetString(buffer, 0, bytes);
			}
 
			string[] mess = tmpMes.Split(seperator);
			for (int i = 0; i < mess.Length; i++)
			{
				if(mess[i].Length > 0)
				{
					messageList.Add(mess[i].Trim(toRemove));
				}
			}
 
			return messageList;
		}
 
		private int GetMessageReturnValue(string message)
		{
			return int.Parse(message.Substring(0, 3));
		}
 
		private int GetPortNumber()
		{
			LockTcpClient();
			int port = 0;
			switch (this.mode)
			{
				case FTPMode.Active:
					Random rnd = new Random((int)DateTime.Now.Ticks);
					port = DATA_PORT_RANGE_FROM + rnd.Next(DATA_PORT_RANGE_TO - DATA_PORT_RANGE_FROM);
					break;
				case FTPMode.Passive:
					ArrayList tempMessageList = new ArrayList();
					int returnValue = 0;
					tempMessageList = SendCommand("PASV");
					returnValue = GetMessageReturnValue((string)tempMessageList[0]);
					if(returnValue != 227)
					{
						if(((string)tempMessageList[0]).Length > 4)
						{
							throw new Exception((string)tempMessageList[0]);
						}
						else
						{
							throw new Exception((string)tempMessageList[0] + " Passive Mode not implemented");
						}
					}
					string message = (string)tempMessageList[0];
					int index1 = message.IndexOf(",", 0);
					int index2 = message.IndexOf(",", index1 + 1);
					int index3 = message.IndexOf(",", index2 + 1);
					int index4 = message.IndexOf(",", index3 + 1);
					int index5 = message.IndexOf(",", index4 + 1);
					int index6 = message.IndexOf(")", index5 + 1);
					port = 256 * int.Parse(message.Substring(index4 + 1, index5 - index4 - 1)) + int.Parse(message.Substring(index5 + 1, index6 - index5 - 1));
					break;
			}
			UnlockTcpClient();
			return port;
		}
 
		private void AddMessagesToMessageList(ArrayList messages)
		{
			if(this.logMessages)
			{
				this.messageList.AddRange(messages);
			}
		}
 
		private IPAddress[] GetLocalAddressList()
		{
			return Dns.Resolve(Dns.GetHostName()).AddressList;
		}
 
		private void LockTcpClient()
		{
			System.Threading.Monitor.Enter(this.tcpClient);
		}
 
		private void UnlockTcpClient()
		{
			System.Threading.Monitor.Exit(this.tcpClient);
		}
 
		private ArrayList GetTokens(String text, String delimiter)
		{
			int next;
        
			ArrayList tokens = new ArrayList();
        
			next = text.IndexOf(delimiter);
			while (next != -1) 
			{
				string item = text.Substring(0, next);
				if(item.Length > 0)
				{
					tokens.Add(item);
				}
 
				text = text.Substring(next + 1);
				next = text.IndexOf(delimiter);
			}
 
			if (text.Length > 0) 
			{
				tokens.Add(text);
			}
 
			return tokens;
		}
	}
}

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