Linux C socket

http://www.linuxhowtos.org/C_C++/socket.htm

C# socket programming

TCP Client


using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Net;
using System.Net.Sockets;
using System.Text;


namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Connect("localhost", "hello");
        }
        static void Connect(String server, String message)
        {
            try
            {
                // Create a TcpClient.
                // Note, for this client to work you need to have a TcpServer 
                // connected to the same address as specified by the server, port
                // combination.
                Int32 port = 13000;
                TcpClient client = new TcpClient(server, port);


                // Translate the passed message into ASCII and store it as a Byte array.
                Byte[] data = System.Text.Encoding.ASCII.GetBytes(message);


                // Get a client stream for reading and writing.
                //  Stream stream = client.GetStream();


                NetworkStream stream = client.GetStream();


                // Send the message to the connected TcpServer. 
                stream.Write(data, 0, data.Length);


                Console.WriteLine("Sent: {0}", message);


                // Receive the TcpServer.response.
                // Buffer to store the response bytes.
                data = new Byte[256];


                // String to store the response ASCII representation.
                String responseData = String.Empty;


                // Read the first batch of the TcpServer response bytes.
                Int32 bytes = stream.Read(data, 0, data.Length);
                responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes);
                Console.WriteLine("Received: {0}", responseData);


                // Close everything.
                client.Close();
            }
            catch (ArgumentNullException e)
            {
                Console.WriteLine("ArgumentNullException: {0}", e);
            }
            catch (SocketException e)
            {
                Console.WriteLine("SocketException: {0}", e);
            }


            Console.WriteLine("\n Press Enter to continue...");
            Console.Read();
        }
    }
}


TCP Listener



using System;
using System.IO;
using System.Net;
using System.Net.Sockets;
using System.Text;


class MyTcpListener
{
    public static void Main()
    {
        try
        {
            // Set the TcpListener on port 13000.
            Int32 port = 13000;
            IPAddress localAddr = IPAddress.Parse("127.0.0.1");


            // TcpListener server = new TcpListener(port);
            TcpListener server = new TcpListener(localAddr, port);


            // Start listening for client requests.
            server.Start();


            // Buffer for reading data
            Byte[] bytes = new Byte[256];
            String data = null;


            // Enter the listening loop.
            while (true)
            {
                Console.Write("Waiting for a connection... ");


                // Perform a blocking call to accept requests.
                // You could also user server.AcceptSocket() here.
                TcpClient client = server.AcceptTcpClient();
                Console.WriteLine("Connected!");


                data = null;


                // Get a stream object for reading and writing
                NetworkStream stream = client.GetStream();


                int i;


                // Loop to receive all the data sent by the client.
                while ((i = stream.Read(bytes, 0, bytes.Length)) != 0)
                {
                    // Translate data bytes to a ASCII string.
                    data = System.Text.Encoding.ASCII.GetString(bytes, 0, i);
                    Console.WriteLine(String.Format("Received: {0}", data));


                    // Process the data sent by the client.
                    data = data.ToUpper();


                    byte[] msg = System.Text.Encoding.ASCII.GetBytes(data);


                    // Send back a response.
                    stream.Write(msg, 0, msg.Length);
                    Console.WriteLine(String.Format("Sent: {0}", data));
                }


                // Shutdown and end connection
                client.Close();
            }
        }
        catch (SocketException e)
        {
            Console.WriteLine("SocketException: {0}", e);
        }


        Console.WriteLine("\nHit enter to continue...");
        Console.Read();
    }
}

A simple PHP chat room

index.php
<html>
<head><Title>
online chart
</title></head>
<!-- frames -->
<frameset rows="70%,*" BORDER="0">
<frame name="top" src="_b.php" marginwidth="0" marginheight="0" scrolling="yes" FRAMEBORDER="NO" noresize>
<frame name="bottom" src="_a.php" marginwidth="0" marginheight="0" scrolling="no" frameborder="no" noresize>
</frameset>
<body>
</body>
</html>

_a.php
<html>
<title>
Chart
</title>
<body TOPMARGIN=0 LEFTMARGIN=0 MARGINWIDTH=0 MARGINHEIGHT=0 >
<?php
$person = @$_POST[person];
$msg = @$_POST[message];
if ($person!="" && $msg!=""){
$handle = fopen("msg.txt","r");
$tot = 0;
$oldmsg = array();
while ($content = fgets($handle)){
$oldmsg[] = $content;
++$tot;
}
fclose($handle);
unlink("msg.txt");
$fp = fopen("msg.txt","a+");
$time = date("h:i");
fwrite($fp,"<font color=\"blue\">".$person."</font> in <font color=\"red\">".$time."</font>  says that  <b>".$msg."</b><br>"."\n");
for ($i =0;$i<$tot;++$i){
if ($i>50) break;
fwrite($fp,$oldmsg[$i]);
}
}
?>
<TABLE width="100%" border="0" cellspacing="0" cellpadding="0">
<tr align="left" bgcolor="#666666">
<td height="20">
</td></tr>
<tr bgcolor="#FFCC66">
<td width="1" height="4" ></td>
</tr>
</TABLE>
<table width="100%" border=0 cellspacing=0 cellpadding=0 bgcolor="#EFEFEF">
<tr bgcolor="#666666">
<td align="left">
<table width="100%" height="500" boder=0 cellspacing=0 cellpadding=0 bgcolor="#EFEFEF">
<tr align="left">
<td valign="top">
<font size="-1" color="#666666">
<table width = "100%" border = "0">
<tr>
<form action="_a.php" method = "post">
<td align="left">
<font size="-1">Name：</font>
<input type="text" name="person" size="12" maxlength="80" value="<?php echo $person;?>">
<br>
<font size="-1"></font>
<textarea type="textarea" name="message" rows="9" cols="150" size = 100></textarea>
<input type="submit" value="Say">
</td>
</form>
</tr>
</table>
</font>
</td>
</tr>
</tr>
</table>
</td>
</tr>
</table>
</body>
</html>

_b.php
<html>
<head>
<title>
Chat
</title>
</head>
<META HTTP-EQUIV=Refresh CONTENT="5; URL=_b.php">
<body bgcolor="#EFEFEF">
<?php
$handle=fopen("msg.txt","r");
//$oldmsg = array();
while ($content = fgets($handle)){
//$oldmsg[] = $content;
//++$tot;
echo $content;
}
?>
</body>
</html>

sky-shell-exec

Software engineering like a handcraft.
Just add on something, but not delete something.