/// <summary>
/// Closes external resources.
/// Safe, can be called multiple times
/// </summary>
public void Close()
{
// physical connection
if (this._tcpClient != null)
{
try
{
// it is important to close the stream
// because somehow tcpClient does not physically breaks down
// the connection - on "one connection" telnet server the
// server remains blocked if not doing it!
this._tcpClient.GetStream().Close();
this._tcpClient.Close();
this._tcpClient = null;
}
catch
{
this._tcpClient = null;
}
}
// clean up
// fast, "can be done several" times
this._virtualScreen = null;
this._buffer = null;
this._callBackReceive = null;
this._callBackSend = null;
this._forceLogout = false;
}
/// <summary>
/// Connect to the telnet server
/// </summary>
/// <returns>true if connection was successful</returns>
public bool Connect()
{
// check for buffer
if (this._buffer == null)
this._buffer = new byte[ReceiveBufferSize];
// virtual screen
if (this._virtualScreen == null)
this._virtualScreen = new VirtualScreen(this._vsWidth, this._vsHeight, 1, 1);
// set the callbacks
if (this._callBackReceive == null)
this._callBackReceive = this.ReadFromStream;
if (this._callBackSend == null)
this._callBackSend = this.WriteToStream;
// flags
this._serverEcho = false;
this._clientInitNaws = false;
this._firstResponse = true;
this._nawsNegotiated = false;
this._forceLogout = false;
// return physical connection
if (this._tcpClient != null)
return true; // we still have a connection -> ?? better reconnect ??
try
{
// TODO: Improve performance ...?
// This is not working: IPAddress ipAddress = IPAddress.Parse(this.hostName);
// IPEndPoint ipEndPoint = new IPEndPoint(ipAddress, this.port);
// because it addresses local endpoints
this._tcpClient = new TcpClient(this._hostName, this._port) {ReceiveTimeout = this._timeoutReceive, SendTimeout = this._timeoutSend, NoDelay = true};
this._tcpClient.GetStream().BeginRead(this._buffer, 0, this._buffer.Length, this._callBackReceive, null);
return true;
}
catch
{
this._tcpClient = null;
return false;
}
}