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?
PS : 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));
}
}
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