//Closes the Connection
public void Close(bool trackConnectStatus)
{
if (trackConnectStatus)
{
FConnectStatus = TConnectStatus.Disconnected;
}
FReadData = false;
base.Close();
}
//Connect Callback
protected void ConnectCallback(IAsyncResult asyncResult)
{
TConnectStatus connectStatus = TConnectStatus.Connected;
try
{
EndConnect(asyncResult);
}
catch (Exception e)
{
connectStatus = TConnectStatus.NeverConnected;
FConnectFailSinceLastEvaluate = true;
AddErrorMessage(e.Message);
}
FReadData = false;
FConnectStatus = connectStatus;
}
//starts an asynchronous attempt to connect to the specified server and port
public void BeginConnectAndTrackStatus()
{
//make sure we have a server string and a valid port number
if (FRemoteHost != null && FRemotePort >= 0 && FRemotePort <= 65535)
{
FConnectStatus = TConnectStatus.Connecting;
try
{
base.BeginConnect(FRemoteHost, FRemotePort, new AsyncCallback(this.ConnectCallback), this);
}
catch (Exception e)
{
FConnectStatus = TConnectStatus.NeverConnected;
FConnectFailSinceLastEvaluate = true;
AddErrorMessage(e.Message);
}
}
}
// Test the Connection if the Server is still available.
private void TestConnection(ref int nTestBytesReceived, ref byte[] ReadBuffer)
{
bool blockingState = Client.Blocking;
bool ReadData = true;
try
{
//we do a read that is guaranteed not to block
//Client.Blocking = false;
nTestBytesReceived = Client.Receive(ReadBuffer);
}
catch (SocketException socketException)
{
//the non-blocking read failed
ReadData = false;
// 10035 == WSAEWOULDBLOCK
//the read may have failed because it WOULD have blocked, ie the
//connection is still there, but nothing has been sent
if (!(socketException.NativeErrorCode.Equals(10035)))
{
//however, if there was some other exception, we've lost the connection
FConnectStatus = TConnectStatus.ConnectionLost;
}
}
finally
{
Client.Blocking = blockingState;
}
if (ReadData)
{
//if we received 0 bytes on a non-blocking read, we've lost the connection
if (nTestBytesReceived == 0)
{
FConnectStatus = TConnectStatus.ConnectionLost;
}
}
}
//Read the data in form the Socket in a seperate Thread
private void ReadToSocket()
{
FReadData = true;
int nBytesReceived = 0;
byte[] ReadBuffer = new byte[ReceiveBufferSize];
try
{
NetworkStream Stream = this.GetStream();
Client.Blocking = true;
//check if the stream can Read
if (Stream.CanRead == true)
{
//check if data available on the stream
if (Stream.DataAvailable)
{
do
{
//Write the data from the Stream to the Buffer and check how many bytes received
string ReceivedString = String.Empty;
nBytesReceived = Stream.Read(ReadBuffer, 0, ReadBuffer.Length);
// if we received some bytes we convert them to a string
if (nBytesReceived > 0)
{
FDataReceived += System.Text.Encoding.ASCII.GetString(ReadBuffer, 0, nBytesReceived);
}
} while (Stream.DataAvailable);
}
else
{
//If there is no data to read we chack if the Server is still availabel;
//Try to Read the Socket and Check if the Server is still available
TestConnection(ref nBytesReceived, ref ReadBuffer);
//If the Server is still availbaleand we received bytes we send them to vvvv
if (nBytesReceived > 0)
{
//If we received data save this and add it to the rest we will received.
FDataReceived += System.Text.Encoding.ASCII.GetString(ReadBuffer, 0, nBytesReceived);
}
}
}
}
catch (ObjectDisposedException objectDisposedException)
{
//if the TcpClient or NetworkStream is closed, we're also not connected anymore
FConnectStatus = TConnectStatus.ConnectionLost;
AddErrorMessage(objectDisposedException.Message);
}
catch (InvalidOperationException invalidOperationException)
{
//if the socket is closed, we're not connected anymore
FConnectStatus = TConnectStatus.ConnectionLost;
AddErrorMessage(invalidOperationException.Message);
}
catch (IOException ioException)
{
//if a network error occured, we're not connected anymore
FConnectStatus = TConnectStatus.ConnectionLost;
AddErrorMessage(ioException.Message);
}
catch (Exception e)
{
AddErrorMessage(e.Message);
}
// Add the receive Data to the DataStorage List.
Monitor.Enter(ReadLock);
try
{
if (!String.IsNullOrEmpty(FDataReceived))
{
FDataStorage.Add(FDataReceived);
}
}
finally
{
Monitor.Exit(ReadLock);
}
// Deltet the received data for the next reading cycling
FDataReceived = String.Empty;
//set the reading status to false
FReadData = false;
}
