Sending 4bytes header message to tcpip

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I read a lot of article but none give me a clear picture.

My company required me to write a program to send a 4 byte header message to a specific IP and Port... Message will have a 4 byte header followed by the message itself... can anybody give me some idea or best to have a sample and simple program for me to start with...

Thank you in advance for those who will give their time. :-)

Posted 23-Aug-11 3:46am

The_Collector

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Rob Philpott · Answer 1 · 2011-08-23T04:15:00

Solution 3

Use a TcpClient to connect to the remote end point, get a NetworkStream and send the four bytes and your message to that. Something like:

TcpClient client = new TcpClient("<hostname>", <port>);
NetworkStream ns = client.GetStream();
ns.WriteByte(<byte1>);
ns.WriteByte(<byte2>);
ns.WriteByte(<byte3>);
ns.WriteByte(<byte4>);
// then the rest of your message

ns.Flush();

Posted 23-Aug-11 4:15am

Rob Philpott

Updated 23-Aug-11 4:18am

v3

Comments

BobJanova 23-Aug-11 12:15pm

You can also use Write to write a 4 byte array, which is probably faster.

TheyCallMeMrJames · Answer 2 · 2011-08-23T04:04:00

Solution 1

Prepend the 4 byte message to the start of whatever it is you are sending.

You might want something to sniff the traffic, as well as a pattern/sample message, so that you can verify what you're sending is what they expect.

Here's an article[^] with a simple send() implementation.

Cheers.

Posted 23-Aug-11 4:04am

TheyCallMeMrJames

Arun Jacob · Answer 3 · 2011-08-23T04:14:00

If its some kind of length or something, then use int type and use GetBytes of BitConverter class to produce a 4 byte array.

If you use short data type, then you'll get 2 bytes array after calling GetBytes().

http://msdn.microsoft.com/en-us/library/system.bitconverter.getbytes.aspx[^]
http://msdn.microsoft.com/en-us/library/system.net.sockets.tcpclient(v=VS.80).aspx[^]