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POHow to send length of a package via tcp/ip protocol
 

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  1. POHow to send length of a package via tcp/ip protocol
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    <p>I'm doing this for one of my school projects. I'm trying to design a multi-threaded server that accepts clients for working with a database (adding, deleting records etc). When I connect the client to the server I want to receive all the students in my database.</p> <p>I access the database on the Server Side and store the information in an ArrayList, which I'm trying to send it over the network. I don't have any knowledge on XMLserializing so I'm trying to send each string in the arrayList to the client. When I send the data from the server, I sometimes receive all the data in the same time, sometimes I don't, so my first guess was that I have to split the data I send into packages of some length. I don't see how can I add the length at the beginning of a package. Wouldn't it be the same thing? Maybe I get the correct length maybe I don't. </p> <p>Here is my code; I didn't try sending the length of each package yet, because I have no idea how. I tried sending from the server the length of the arraylist, and read from the network stream that many times, but it doesn't work ( I receive all data in one package). </p> <p>Server side: </p> <pre><code>private void HandleClient(object client) { try { ClientNo++; TcpClient tcpClient = (TcpClient)client; NetworkStream clientStream = tcpClient.GetStream(); byte[] bytes = new byte[4096]; int i; // Robot r = new Robot(); Protocol p = new Protocol(); ArrayList ListaStudentiResponse = p.ExecuteQueryOnStudents("select * from studenti"); byte[] Length = new byte[4]; Length = System.Text.Encoding.ASCII.GetBytes(ListaStudentiResponse.Count.ToString()); clientStream.Write(Length, 0, Length.Length); foreach ( String s in ListaStudentiResponse) { byte[] data = System.Text.Encoding.ASCII.GetBytes(s); clientStream.Write(data, 0, data.Length); } tcpClient.Close(); ClientNo--; } catch (Exception ex) { Console.WriteLine(ex.Message); } } </code></pre> <p>On Client: </p> <pre><code>private void connectToServerToolStripMenuItem_Click(object sender, EventArgs e) { tcpclient = new TcpClient(); NetworkStream netStream; try { tcpclient.Connect("localhost", 8181); netStream = tcpclient.GetStream(); Byte[] bytes = new Byte[10000]; int readBytes = netStream.Read(bytes, 0, bytes.Length); int Length =Int32.Parse(Encoding.ASCII.GetString(bytes, 0, readBytes)); MessageBox.Show(Length.ToString()); int i = 0; while (i &lt; Length) { i++; Byte[] b = new Byte[10000]; readBytes = netStream.Read(bytes, 0, bytes.Length); String response = Encoding.ASCII.GetString(b, 0, readBytes); MessageBox.Show(response); } } catch (Exception ex) { MessageBox.Show(ex.Message); } } } </code></pre>
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    1. USDan Dinu
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    1. COYou should match the buffer lengths on the client. i.e. use a 4 byte and 10,000 byte buffer on length and records respectively.
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      1. POHow to send length of a package via tcp/ip protocol
      1. USSmudge202
 

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