Monday, November 18, 2013

PHP example


HTML Client :  demo.html

<!DOCTYPE html>
<html>
<head>
<script src="javascript/jquery/jquery-1.9.1.min.js"></script>
<script>
http_post = function(){
var data = $.ajax({
        type: "POST",
        async: false,
        url: 'http://10.30.130.125/demo.php',
        data: ({request : {ID:"hello world"} }) 
        }).responseText;
         //return eval('(' +data +')');
//eval('(' +data +')');
//alert (data);
document.getElementById("demo").innerHTML=data ;
<!---document.getElementById("demo").innerHTML="Hello World";  -->
}
</script>
</head>
<body>
<p>Click the button to trigger a function.</p>
<button onclick="http_post()">Click me</button>
<p id="demo"></p>
</body>
</html>


PHP File: demo.php

<?php
error_reporting(E_ALL);
$in_str = "None" ;
if ($_POST) { 
//var_dump($_POST['request']) ;

$in_str = '{"demo":"'.$_POST["request"]['ID'].'"}' ;
//$in_str = $_POST["request"] ;
}

$service_port = '5000' ; 
$address = '10.30.130.170' ;

/* Create a TCP/IP socket. */
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);

$result = socket_connect($socket, $address, $service_port);

echo $in_str ;

/* write into TCP/IP socket.*/
socket_write($socket, $in_str, strlen($in_str)); 

/* read from TCP/IP socket. */
$out = socket_read($socket, 4096);

/* Closing socket... */
socket_close($socket);

//$out = "{\"a\":1 }" ; 
header('Access-Control-Allow-Origin: *');
echo $out;
//echo '{"hi": 1 }';

/*echo "{\"a\":1 }" ;*/

?>

C Server Socket code below:

#include < sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>

#include <sys/types.h>

int main(int argc, char *argv[])
{
    int listenfd = 0, connfd = 0;
    struct sockaddr_in serv_addr;
        char recvBuff[1024];
    int data = 65;
        int  n  ;
    time_t ticks;

    listenfd = socket(AF_INET, SOCK_STREAM, 0);
    memset(&serv_addr, '0', sizeof(serv_addr));
    memset(&recvBuff, '0', sizeof(recvBuff));

    serv_addr.sin_family = AF_INET;
    serv_addr.sin_addr.s_addr = htonl(INADDR_ANY);
    serv_addr.sin_port = htons(5000);

    bind(listenfd, (struct sockaddr*)&serv_addr, sizeof(serv_addr));

    listen(listenfd, 10);

    while(1)
    {
        connfd = accept(listenfd, (struct sockaddr*)NULL, NULL);
        n = read(connfd, recvBuff, sizeof(recvBuff)) ;
        recvBuff[n] = 0;
        printf("Recieved Client request.\n") ;
        printf("%s\n" , recvBuff) ;  // Received string will be ID => {"demo":"hello world"} 
        if(strstr(recvBuff, "hello world")== 0) 
        {
         write(connfd, &data, sizeof(data));
         close(connfd);
        }
        else
        {
          printf("%s\n" , recvBuff) ;
        }
        data++ ;
     }

}

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