/// <summary>
/// Async callback when a packet is received
/// </summary>
/// <param name="result"></param>
private void OnPacketReceived(IAsyncResult result)
{
try
{
// Recalls the state
var _state = result.AsyncState as StateObject;
// Grabs the numbber of bytes received and ends the receive
var bytes = _state.Socket.EndReceiveFrom(result, ref _state.RemoteEndpoint);
// Creates a temp byte array to put the received data
var packetData = new byte[bytes];
// Coppies the buffer passed in the stateobject to the temp byte array instantiated above
Array.Copy(_state.Buffer, 0, packetData, 0, packetData.Length);
// Fires the packet received event for Tcp.cs to handle
PacketReceived?.Invoke(new Packet(packetData));
// Restarts the async receive loop
_state.Socket.BeginReceiveFrom(_state.Buffer,
0,
_state.Buffer.Length,
SocketFlags.None,
ref _state.RemoteEndpoint,
OnPacketReceived,
new StateObject(_state.RemoteEndpoint, _state.Buffer, _state.Socket));
}
catch (Exception ex)
{
UdpError?.Invoke(ex);
}
}
/// <summary>
/// Sends a single packet to the given endpoint
/// </summary>
/// <param name="packet"></param>
/// <param name="destination"></param>
public void SendPacket(Packet packet, EndPoint destination)
{
try
{
using (var _soc = new Socket(SocketType.Dgram, ProtocolType.Udp))
{
_soc.SendTo(packet.Raw, destination);
}
}
catch (Exception ex)
{
UdpError?.Invoke(ex);
}
}
/// <summary>
/// Begins receiving packets asynchronously
/// </summary>
/// <param name="source"></param>
public void BeginReceivePackets(EndPoint source)
{
try
{
_soc.Dispose();
_soc = new Socket(SocketType.Dgram, ProtocolType.Udp);
var _buff = new byte[10000];
_soc.Bind(source);
_soc.BeginReceiveFrom(_buff,
0,
_buff.Length,
SocketFlags.None,
ref source,
OnPacketReceived,
new StateObject(source, _buff, _soc));
}
catch (Exception ex)
{
UdpError?.Invoke(ex);
}
}