problem when sending data over TCP socke from c# client to java se

G

Guest

Hi,

I have a problem when sending data over TCP socket from c# client to java
server.
the connection established ok, but i can't send data from c# client to java
server.
it's work ok with TcpClient, NetworkStream and StreamWriter classes.

but with low level socket it doesn't work (When using the Socket class Send
method).
here is the sample code (c# and java):
===========
C# Code
===========

public static void RunSocketTcpClient()
{
Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream,
ProtocolType.Tcp);
IPEndPoint iep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8080);
byte[] data = new byte[1024];
string stringData;
int recv=0;
sock.Connect(iep);
data = Encoding.ASCII.GetBytes("Hello");
sock.Send(data, data.Length, SocketFlags.None);
}

=================
The Java code
=================
//: c15:JabberServer.java
// Very simple server that just
// echoes whatever the client sends.
// {RunByHand}
import java.io.*;
import java.net.*;

public class JabberServer {
// Choose a port outside of the range 1-1024:
public static final int PORT = 8080;
public static void main(String[] args)
throws IOException {
ServerSocket s = new ServerSocket(PORT);
System.out.println("Started: " + s);
try {
// Blocks until a connection occurs:
Socket socket = s.accept();
try {
System.out.println(
"Connection accepted: "+ socket);
BufferedReader in =
new BufferedReader(
new InputStreamReader(
socket.getInputStream()));
// Output is automatically flushed
// by PrintWriter:
PrintWriter out =
new PrintWriter(
new BufferedWriter(
new OutputStreamWriter(
socket.getOutputStream())),true);
while (true) {
String str = in.readLine();
if (str.equals("END")) break;
System.out.println("Echoing: " + str);
out.println(str);
}
// Always close the two sockets...
} finally {
System.out.println("closing...");
socket.close();
}
} finally {
s.close();
}
}
} ///:~

Thanks.
 
V

Vadym Stetsyak

What error Send is returning?
Was the Connect(...) method uccessful - check Connected property of the
socket.

The client is not sending anything at all?
 
G

Guest

Vadym,

there is no error on the send method, just the java server doesn't get thet
data.
i think the problem is that there is no Socket.Flush() method , because if
after the sock.send i call to sock.Shutdown(SocketShutdown.Both) them the
java server gets the sent data.

Thanks.


Vadym Stetsyak said:
What error Send is returning?
Was the Connect(...) method uccessful - check Connected property of the
socket.

The client is not sending anything at all?

--
Vadym Stetsyak aka Vadmyst
yaron said:
Hi,

I have a problem when sending data over TCP socket from c# client to java
server.
the connection established ok, but i can't send data from c# client to java
server.
it's work ok with TcpClient, NetworkStream and StreamWriter classes.

but with low level socket it doesn't work (When using the Socket class Send
method).
here is the sample code (c# and java):
===========
C# Code
===========

public static void RunSocketTcpClient()
{
Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream,
ProtocolType.Tcp);
IPEndPoint iep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8080);
byte[] data = new byte[1024];
string stringData;
int recv=0;
sock.Connect(iep);
data = Encoding.ASCII.GetBytes("Hello");
sock.Send(data, data.Length, SocketFlags.None);
}

=================
The Java code
=================
//: c15:JabberServer.java
// Very simple server that just
// echoes whatever the client sends.
// {RunByHand}
import java.io.*;
import java.net.*;

public class JabberServer {
// Choose a port outside of the range 1-1024:
public static final int PORT = 8080;
public static void main(String[] args)
throws IOException {
ServerSocket s = new ServerSocket(PORT);
System.out.println("Started: " + s);
try {
// Blocks until a connection occurs:
Socket socket = s.accept();
try {
System.out.println(
"Connection accepted: "+ socket);
BufferedReader in =
new BufferedReader(
new InputStreamReader(
socket.getInputStream()));
// Output is automatically flushed
// by PrintWriter:
PrintWriter out =
new PrintWriter(
new BufferedWriter(
new OutputStreamWriter(
socket.getOutputStream())),true);
while (true) {
String str = in.readLine();
if (str.equals("END")) break;
System.out.println("Echoing: " + str);
out.println(str);
}
// Always close the two sockets...
} finally {
System.out.println("closing...");
socket.close();
}
} finally {
s.close();
}
}
} ///:~

Thanks.
Click to expand...
Click to expand...
 
V

Vadym Stetsyak

you can set the option of the socket to Nagle SocketOptionName.NoDelay.
It seems to me that Nagle algorithm may be the reason of the send delay.
This algorithm is responsible for preventing network congestion with small
data packets. In your case data sent was not big. You can try to send
greater amount of data and watch for the java server...

To set the option call SetSocketOptionMethod...

--
Vadym Stetsyak aka Vadmyst
yaron said:
Vadym,

there is no error on the send method, just the java server doesn't get thet
data.
i think the problem is that there is no Socket.Flush() method , because if
after the sock.send i call to sock.Shutdown(SocketShutdown.Both) them the
java server gets the sent data.

Thanks.


Vadym Stetsyak said:
What error Send is returning?
Was the Connect(...) method uccessful - check Connected property of the
socket.

The client is not sending anything at all?

--
Vadym Stetsyak aka Vadmyst
yaron said:
Hi,

I have a problem when sending data over TCP socket from c# client to java
server.
the connection established ok, but i can't send data from c# client to java
server.
it's work ok with TcpClient, NetworkStream and StreamWriter classes.

but with low level socket it doesn't work (When using the Socket class Send
method).
here is the sample code (c# and java):
===========
C# Code
===========

public static void RunSocketTcpClient()
{
Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream,
ProtocolType.Tcp);
IPEndPoint iep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8080);
byte[] data = new byte[1024];
string stringData;
int recv=0;
sock.Connect(iep);
data = Encoding.ASCII.GetBytes("Hello");
sock.Send(data, data.Length, SocketFlags.None);
}

=================
The Java code
=================
//: c15:JabberServer.java
// Very simple server that just
// echoes whatever the client sends.
// {RunByHand}
import java.io.*;
import java.net.*;

public class JabberServer {
// Choose a port outside of the range 1-1024:
public static final int PORT = 8080;
public static void main(String[] args)
throws IOException {
ServerSocket s = new ServerSocket(PORT);
System.out.println("Started: " + s);
try {
// Blocks until a connection occurs:
Socket socket = s.accept();
try {
System.out.println(
"Connection accepted: "+ socket);
BufferedReader in =
new BufferedReader(
new InputStreamReader(
socket.getInputStream()));
// Output is automatically flushed
// by PrintWriter:
PrintWriter out =
new PrintWriter(
new BufferedWriter(
new OutputStreamWriter(
socket.getOutputStream())),true);
while (true) {
String str = in.readLine();
if (str.equals("END")) break;
System.out.println("Echoing: " + str);
out.println(str);
}
// Always close the two sockets...
} finally {
System.out.println("closing...");
socket.close();
}
} finally {
s.close();
}
}
} ///:~

Thanks.
Click to expand...
Click to expand...
Click to expand...
 
G

Guest

Thanks Vadym,

the problem was that the java server wait for sending Enter (new line
character) by using String str = in.readLine();
so after adding new line char to the end of the string and sending the java
server receive that string.

Thanks again.

Vadym Stetsyak said:
you can set the option of the socket to Nagle SocketOptionName.NoDelay.
It seems to me that Nagle algorithm may be the reason of the send delay.
This algorithm is responsible for preventing network congestion with small
data packets. In your case data sent was not big. You can try to send
greater amount of data and watch for the java server...

To set the option call SetSocketOptionMethod...

--
Vadym Stetsyak aka Vadmyst
yaron said:
Vadym,

there is no error on the send method, just the java server doesn't get thet
data.
i think the problem is that there is no Socket.Flush() method , because if
after the sock.send i call to sock.Shutdown(SocketShutdown.Both) them the
java server gets the sent data.

Thanks.


Vadym Stetsyak said:
What error Send is returning?
Was the Connect(...) method uccessful - check Connected property of the
socket.

The client is not sending anything at all?

--
Vadym Stetsyak aka Vadmyst
Hi,

I have a problem when sending data over TCP socket from c# client to java
server.
the connection established ok, but i can't send data from c# client to
java
server.
it's work ok with TcpClient, NetworkStream and StreamWriter classes.

but with low level socket it doesn't work (When using the Socket class
Send
method).
here is the sample code (c# and java):
===========
C# Code
===========

public static void RunSocketTcpClient()
{
Socket sock = new Socket(AddressFamily.InterNetwork, SocketType.Stream,
ProtocolType.Tcp);
IPEndPoint iep = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 8080);
byte[] data = new byte[1024];
string stringData;
int recv=0;
sock.Connect(iep);
data = Encoding.ASCII.GetBytes("Hello");
sock.Send(data, data.Length, SocketFlags.None);
}

=================
The Java code
=================
//: c15:JabberServer.java
// Very simple server that just
// echoes whatever the client sends.
// {RunByHand}
import java.io.*;
import java.net.*;

public class JabberServer {
// Choose a port outside of the range 1-1024:
public static final int PORT = 8080;
public static void main(String[] args)
throws IOException {
ServerSocket s = new ServerSocket(PORT);
System.out.println("Started: " + s);
try {
// Blocks until a connection occurs:
Socket socket = s.accept();
try {
System.out.println(
"Connection accepted: "+ socket);
BufferedReader in =
new BufferedReader(
new InputStreamReader(
socket.getInputStream()));
// Output is automatically flushed
// by PrintWriter:
PrintWriter out =
new PrintWriter(
new BufferedWriter(
new OutputStreamWriter(
socket.getOutputStream())),true);
while (true) {
String str = in.readLine();
if (str.equals("END")) break;
System.out.println("Echoing: " + str);
out.println(str);
}
// Always close the two sockets...
} finally {
System.out.println("closing...");
socket.close();
}
} finally {
s.close();
}
}
} ///:~

Thanks.
Click to expand...
Click to expand...
Click to expand...
 

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