/// Last Modified: 10/24/10
/// <summary>
/// A static method that will send packet information
/// to the IPEndpoint supplied. This method is blocking
/// and does not support asynchronous sending of information.
/// </summary>
/// -----------------------------------------------------
/// PRECONDITIONS: NA -- No preconditions exist.
/// -----------------------------------------------------
/// Parameters:
/// <param name="p">
/// A packet of information to send.
/// </param>
/// <param name="ipep">
/// The destination endpoint to send the packet.
/// </param>
/// -----------------------------------------------------
/// POSTCONDITIONS: The message will be sent or an exception will have been thrown.
/// -----------------------------------------------------
/// Exceptions:
/// 1) NodeSocketInvalid
/// 2) NodeUnknownException
/// -----------------------------------------------------
/// Return Value:
public void SendTo(Packet p, IPEndPoint ipep)
{
Socket s = null;
try
{
//Create the socket to send information to.
s = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
//Cast the endpoint.
EndPoint ep = (EndPoint)ipep;
//Perform any necessary encryptions based on the security model.
byte[] byData = (m_nodeSecurityModel != null)
? m_nodeSecurityModel.ByteEncrypt(p.ToByteArray())
: p.ToByteArray();
//Marshall the string data into a byte stream and send the data.
s.SendTo(byData, SocketFlags.None, ep);
}
catch (ObjectDisposedException ode)
{
throw new NodeSocketInvalid("The Socket has been closed. ", ode);
}
catch (SocketException se)
{
//MSDN NOTE: If you receive a SocketException, use the SocketException.ErrorCode property to obtain the specific error code.
// After you have obtained this code, refer to the Windows Sockets version 2 API error code documentation in the MSDN library
//for a detailed description of the error.
throw new NodeSocketInvalid(se.Message, se);
}
catch (Exception ex)
{
//Call the error callback if one exists.
throw new NodeUnknownException(ex.Message, ex);
}
finally
{
//Close the socket.
s.Close();
}
}
/// Last Modified: 11/28/09
/// <summary>
/// Starts the sending the packet.
/// </summary>
/// -----------------------------------------------------
/// PRECONDITIONS: Refer to the following arguments:
/// -----------------------------------------------------
/// Parameters:
/// -----------------------------------------------------
/// POSTCONDITIONS: NA -- No postconditions exist.
/// -----------------------------------------------------
/// Return Value:
public void AsynchSend(Packet p, IPEndPoint ipep)
{
//Avoid invalid socket access.
if (m_Socket == null) return;
//Prepare the state object.
StateObject state = new StateObject();
state.socket = m_Socket;
state.iep = ipep;
state.buffer = p.ToByteArray();
//Begin sending the packet information.
m_Socket.BeginSendTo(state.buffer, 0, StateObject.BUFFER_SIZE,
SocketFlags.None, (EndPoint)ipep,
new AsyncCallback(OnSendCallback),
state);
}