private void TCPConnection_ErrorReceived(object sender, ZusiTcpException ex) // Handles MyTCPConnection.ErrorReceived
{
// If something goes wrong...
// ... show the user what the connection object has to say.
System.Windows.Forms.MessageBox.Show(String.Format("An error occured when receiving data: {0}", ex.Message));
// ... reset the connection by explicitly calling Disconnect()
MyTCPConnection.Disconnnect();
//... and then change the button label to "Connect".
BtnConnect.Text = "Connect";
}
private void ReceiveLoop()
{
var dataHandlers = new Dictionary <string, MethodInfo>();
try
{
while (ConnectionState == ConnectionState.Connected)
{
int packetLength = _clientReader.ReadInt32();
int curInstr = GetInstruction(_clientReader.ReadByte(), _clientReader.ReadByte());
if (curInstr < 10)
{
throw new ZusiTcpException("Unexpected Non-DATA instruction received.");
}
// The first 2 bytes have been the instruction.
int bytesRead = 2;
while (bytesRead < packetLength)
{
int curID = _clientReader.ReadByte() + 256 * curInstr;
// Another byte read for the ID.
bytesRead++;
CommandEntry curCommand = _commands[curID];
MethodInfo handlerMethod;
if (!dataHandlers.TryGetValue(curCommand.Type, out handlerMethod))
{
handlerMethod = GetType().GetMethod(
String.Format("HandleDATA_{0}", curCommand.Type),
BindingFlags.Instance | BindingFlags.NonPublic,
null,
new[] { typeof(BinaryReader), typeof(int) },
null);
if (handlerMethod == null)
{
throw new ZusiTcpException(
String.Format(
"Unknown type {0} for DATA ID {1} (\"{2}\") occured.", curCommand.Type, curID, curCommand.Name));
}
/* Make sure the handler method returns an int. */
Debug.Assert(handlerMethod.ReturnType == typeof(int));
dataHandlers.Add(curCommand.Type, handlerMethod);
}
bytesRead += (int)handlerMethod.Invoke(this, new object[] { _clientReader, curID });
Debug.Assert(bytesRead <= packetLength);
}
}
}
catch (Exception e)
{
if (e is ZusiTcpException)
{
_hostContext.Post(ErrorMarshal, e as ZusiTcpException);
}
else if (e is EndOfStreamException)
{
/* EndOfStream occurs when the NetworkStream reaches its end while the binaryReader tries to read from it.
* This happens when the socket closes the stream.
*/
var newEx = new ZusiTcpException("Connection to the TCP server has been lost.", e);
_hostContext.Post(ErrorMarshal, newEx);
}
else if (e is ThreadAbortException)
{
/* Thread has been killed: Nothing to do. */
return;
}
else
{
var newEx =
new ZusiTcpException(
"An unhandled exception has occured in the TCP receiving loop. This is very probably " +
"a bug in the Zusi TCP interface for .NET. Please report this error to the author(s) " +
"of this application and/or the author(s) of the Zusi TCP interface for .NET.", e);
_hostContext.Post(ErrorMarshal, newEx);
}
Disconnnect();
ConnectionState = ConnectionState.Error;
}
}
private void TCPConnection_ErrorReceived(object sender, ZusiTcpException ex)
{
System.Windows.Forms.MessageBox.Show(String.Format("An error occured when receiving data: {0}", ex.Message));
MyTCPConnection.Disconnnect();
btnConnect.Text = "Connect";
}
