static void Main(string[] args)
{
using (Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp))
{
IPEndPoint endPoint = new IPEndPoint(IPAddress.Any, 9000);
socket.Bind(endPoint);
socket.Listen(10);
while (true)
{
try
{
Socket clntSocket = socket.Accept();
Console.WriteLine("Client [" + clntSocket.RemoteEndPoint + "] Connected");
try
{
AsyncStateData data = new AsyncStateData();
data.Buffer = new byte[MAX_LENGTH];
data.Socket = clntSocket;
clntSocket.BeginReceive(data.Buffer, 0, data.Buffer.Length, SocketFlags.None, asyncReceiveCallback, data);
}
catch (SocketException e)
{
alertClosed(clntSocket);
clntSocket.Close();
}
}
catch (SocketException)
{
Console.WriteLine("Accept Error");
}
}
}
}
private static void asyncSendCallback(IAsyncResult asyncResult)
{
Socket socket = asyncResult.AsyncState as Socket;
try
{
socket.EndSend(asyncResult);
AsyncStateData data = new AsyncStateData();
data.Buffer = new byte[MAX_LENGTH];
data.Socket = socket;
socket.BeginReceive(data.Buffer, 0, data.Buffer.Length, SocketFlags.None, asyncReceiveCallback, data);
}
catch (SocketException e)
{
alertClosed(socket);
socket.Close();
}
}
private static void asyncReceiveCallback(IAsyncResult asyncResult)
{
AsyncStateData recvData = asyncResult.AsyncState as AsyncStateData;
try
{
int nRecv = recvData.Socket.EndReceive(asyncResult);
string txt = Encoding.UTF8.GetString(recvData.Buffer, 0, nRecv);
if (txt != "")
{
Console.WriteLine("Client [" + recvData.Socket.RemoteEndPoint + "] : " + txt);
}
byte[] sendBytes = Encoding.UTF8.GetBytes("Hello : " + txt);
recvData.Socket.BeginSend(sendBytes, 0, sendBytes.Length, SocketFlags.None, asyncSendCallback, recvData.Socket);
}
catch (SocketException e)
{
alertClosed(recvData.Socket);
recvData.Socket.Close();
}
}