I have two separate socket projects in VS.NET. One of them is sender, other one is receiver. After starting receiver, i send data from sender. Although send method returns 13 bytes as successfully transferred, the receiver receives 0 (zero). The receiver accepts sender socket and listens to it. But cannot receive data. Why?
P.S. : If sender code is put in receiver project, receiver can get data, as well.
I think the problem is that the send application is ending before the receiver can read the data. If you put a Thread.Sleep(1000); after the Send call, the receive application will read the data (at least when I tested it).
Most likely this is a bug in your code but without seeing the code it's impossible to tell.
However be aware that TCP/IP has no concept of messages, only a stream of data. So it's posisble to send 13 bytes and receive 6 in one read and 7 in the next. Or conversely to send 13 bytes then later send 7 more and on the receiveing side to receive them as a single block of 20 bytes.
Thank you so much for your interest. Here is the code:
/*********************************** Receiver **********************/
class Program { static void Main(string[] args) { Receiver recv = new Receiver(); recv.Start();
} }
public class Receiver { public void Start() { Socket gateSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); gateSocket.Bind(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8999)); gateSocket.Listen(12); Thread thGateListen = new Thread(new ParameterizedThreadStart(GateListener)); thGateListen.Start(gateSocket); } public void GateListener(object obj) { Socket gateSocket = (Socket)obj; for (; ; ) { Socket newRequest = gateSocket.Accept(); Console.WriteLine("New Connection Request"); Thread thReadData = new Thread(new ParameterizedThreadStart(ReadFromSocket)); thReadData.Start(newRequest); } } public void ReadFromSocket(object obj) { Socket s = (Socket)obj; for (; ; ) { if (s.Available > 0) { byte[] buffer = new byte[s.Available]; s.Receive(buffer); Console.WriteLine(System.Text.Encoding.ASCII.GetString(buffer)); } } } } /*********************************** Sender **********************/
class Program { static void Main(string[] args) { Sender s = new Sender(); s.Send("Hello Socket!"); } }
class Sender { public void Send(string s) { Socket sendSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp); sendSocket.Connect(new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8999)); sendSocket.Send(System.Text.Encoding.ASCII.GetBytes(s)); } } 
