void UDPSendTo(byte[] data, int offset, int size)
{
UDPSocketStateObject state = new UDPSocketStateObject
{
obj = this,
socket = socket,
};
socket.BeginSendTo(data, offset, size, 0, remoteEnd, new AsyncCallback(WriteCallback), state);
}
public void StartRead()
{
UDPSocketStateObject state = new UDPSocketStateObject
{
obj = this,
socket = socket,
buf = udpRcvBuf,
remote = remoteEnd,
};
PostReadRequest(state);
}
public static void WriteCallback(IAsyncResult ar)
{
UDPSocketStateObject state = (UDPSocketStateObject)ar.AsyncState;
try
{
state.socket.EndSendTo(ar);
}
catch (SocketException ex)
{
state.obj.PushError(ex);
}
}
public static void RecvCallback(IAsyncResult ar)
{
UDPSocketStateObject state = (UDPSocketStateObject)ar.AsyncState;
try
{
int bytesRead = state.socket.EndReceiveFrom(ar, ref state.remote);
if (bytesRead <= 0)
{
var ex = new EndOfStreamException("socket closed by peer");
state.obj.PushError(ex);
return;
}
var data = new byte[bytesRead];
Buffer.BlockCopy(state.buf, 0, data, 0, bytesRead);
state.obj.PushToRecvQueue(data);
state.obj.PostReadRequest(state);
}
catch (SocketException ex)
{
state.obj.PushError(ex);
}
}
void PostReadRequest(UDPSocketStateObject state)
{
socket.BeginReceiveFrom(state.buf, 0, state.buf.Length, 0, ref remoteEnd,
new AsyncCallback(RecvCallback), state);
}
