static private void UdpConnectThreadProc(object data)
{
UdpClients udpClients = (UdpClients)data;
IPEndPoint peerEndpoint = udpClients.PopEndpoint();
if (peerEndpoint.AddressFamily != udpClients.TargetIP.AddressFamily)
{
//ip stack not match
udpClients.DoDecrease();
return;
}
UdpClient ucli = new UdpClient(udpClients.TargetIP.AddressFamily);
Socket uSocket = ucli.Client;
uSocket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReceiveTimeout, 3000);
Byte[] sendBytes = Encoding.ASCII.GetBytes(UdpClients.kAskQuestion);
//Creates an IPEndPoint to record the IP Address and port number of the sender.
// The IPEndPoint will allow you to read datagrams sent from any source.
IPEndPoint RemoteIpEndPoint = new IPEndPoint(IPAddress.Any, 0);
try
{
//Send
ucli.Send(sendBytes, sendBytes.Length, new IPEndPoint(udpClients.TargetIP, peerEndpoint.Port));
// Blocks until a message returns on this socket from a remote host.
Byte[] receiveBytes = ucli.Receive(ref RemoteIpEndPoint);
string returnData = Encoding.ASCII.GetString(receiveBytes);
string msg = "(UDP Client Received) LocalEndPoint {" + ucli.Client.LocalEndPoint.ToString() + "}, RemoteEndPoint {"
+ RemoteIpEndPoint.ToString() + "}, msg-->{" + returnData.ToString() + "}";
Trace.WriteLine(msg);
if (returnData.ToString().Contains(UdpClients.kAnswer))
{
}
else
{
udpClients.AddExceptionalPort(peerEndpoint.Port);
}
}
catch (SocketException ex)
{
Trace.WriteLine("SocketErrorcode " + ex.ErrorCode + ", " + ex.ToString());
switch (ex.SocketErrorCode)
{
case SocketError.TimedOut:
case SocketError.ConnectionReset:
break;
default:
break;
}
udpClients.AddExceptionalPort(peerEndpoint.Port);
}
catch (Exception e)
{
Trace.WriteLine(e.ToString());
Debug.Assert(false);
}
finally
{
ucli.Close();
}
udpClients.DoDecrease();
}
