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private const int BUFFERSIZE = 2048;
private TcpClient tcp;
private NetworkStream stream;
// Open TCP connection
public int Open(string host, int port, int timeOutTcp)
{
try
{
tcp = new TcpClient(host, port);
tcp.SendBufferSize = BUFFERSIZE;
tcp.ReceiveBufferSize = BUFFERSIZE;
tcp.NoDelay = true;
tcp.ReceiveTimeout = 5000; // 5 secondes
tcp.SendTimeout = 5000;
}
catch (SocketException)
{
throw new MyException("Open: Impossible to connect to: " + host + ", on port: " + port);
}
catch (ArgumentNullException)
{
throw new MyException("Open: hostname is null or invalid: " + host);
}
catch (ArgumentOutOfRangeException)
{
throw new MyException("Open: " + port + " is not between " +
System.Net.IPEndPoint.MinPort + " and " + System.Net.IPEndPoint.MaxPort);
}
try
{
stream = tcp.GetStream();
}
catch (ObjectDisposedException)
{
throw new MyException("Open: the connection has been closed");
}
catch (InvalidOperationException)
{
throw new MyException("Open: is not connected to " + host);
}
}
/// Reads data from a stream until the end is reached. The
/// data is returned as a byte array.
public static byte[] ReadBytes(Stream stream, int size)
{
byte[] buffer = new byte[BUFFERSIZE];
try
{
int bytesRead = 0;
int bytesReadThisTurn;
while (true)
{
try
{
bytesReadThisTurn = stream.Read(buffer, bytesRead, Math.Min(size, buffer.Length - bytesRead));
}
catch (IOException e)
{
throw new MyException("ReadBytes: I/O read stream error, " + e.Message, e);
}
if (bytesReadThisTurn <= 0 || bytesRead >= size)
break;
bytesRead += bytesReadThisTurn;
// If we've reached the end of our buffer, check to see if there's
// any more information
if (bytesRead >= (buffer.Length - 256) )
{
byte[] newBuffer = new byte[buffer.Length * 2];
Buffer.BlockCopy(buffer, 0, newBuffer, 0, bytesRead);
buffer = newBuffer;
}
if (bytesRead == size)
break;
}
if (buffer.Length == bytesRead)
{
return buffer;
}
else
{
byte[] response = new byte[bytesRead];
Buffer.BlockCopy(buffer, 0, response, 0, bytesRead);
return response;
}
}
catch (NotSupportedException e)
{
throw new MyException("ReadBytes: operation unsupported, " + e.Message, e);
}
catch (ArgumentNullException e)
{
throw new MyException("ReadBytes: Offset or length is negative, " + e.Message, e);
}
catch (ArgumentException e)
{
throw new MyException("ReadBytes: length buffer < offset, " + e.Message, e);
}
catch (ObjectDisposedException e)
{
throw new MyException("ReadBytes: Network connection closed, " + e.Message, e);
}
} |
