Work was good and honest in RENKO. I wore three hats at all times ;

Hat#1. Software Engineer/Programmer : Basically I wrote one main program and couple of dozen other programs. The main program used the following languages; Python, PHP, C, JavaScript. The small scripts I wrote used Jython. And as for what these programs did; Picassa and/or Flickr like internet site. Processed image.

Hat#2. Network Engineer : As you may have read from the previous post I set up an IBM server and changed the whole network topology. (Argh! moment here) Lots of manual labor. However now the company has a faster and secured network. My biggest problem was parts. Network parts are really expensive. And trying to do it cheap is really hard.

Hat#3. Floor manager in a photo shop : Yeah you heard it here, John Roach worked as a mean guy trying to sell wedding photos to young couples. This hat I must admit I didn’t really like. Not because it was hard or it was all about selling. But because the person before me was just so… how can I put it politically correct… basically he was messy. Can’t tell everything on the internet can we?

Just because I worked hard doesn’t mean I didn’t have fun. I had lots of it. And learned a lot! The one thing I am proud to say I have learned is Jython! What a quick fix language! And the other thing is Image processing. A hands out to Open-CV and Python Image Library (PIL).

And talking of a good summer. My grandpa came all the way from a far land called USA. This his first visit to Turkey! So we are very happy to have him. We are trying to con him in to staying here in Turkey.  Me and my brother already has plans to hide his tickets and shoes. Don’t know if it will work or not. Mom will probably catch up to us. Meh… My love met my grandfather. They seemed to like each other which is also good

Below you will see images from my work place and my love with grandpa. Enjoy!

int ab=10;
int array[ab];

And surprisingly it didn’t work. (I mean it works in C++ and C#)
Anyway I was thinking of ways on how to do this thought of using malloc() however I really didn’t know how hence I did some Google’ing around. And found this neat piece of code.

int *resize_array(int *a, size_t new_size)
{
  int *save;

  save = realloc(a, new_size);
  if (save == NULL) {
    fprintf(stderr, "Memory exhausted\n");
    exit(EXIT_FAILURE);
  }
  return save;
}

int *user_old_array; // the array
int new_array_size=10;
user_old_array = malloc(initial_array_size * sizeof *user_old_array); //resized array

Quite neat isn’t it. I thought I should probably write this somewhere so I won’t forget. Hence the post.

Enjoy!

The CVS code is as follows

cvs -d:pserver:anonymous@theblackbox.cvs.sourceforge.net:/cvsroot/theblackbox login

cvs -z3 -d:pserver:anonymous@theblackbox.cvs.sourceforge.net:/cvsroot/theblackbox co -P modulename

I am sorry to say due to some weird problem you can not view the CVS modules from Sourceforge. You will need to use some kind of client. I am currently using Eclipse as my development IDE hence all my CVS materials comes from that. I have heard that TortoiseCVS is quite neat in its own way (for Windows) but I’d rather use Eclipse your choice.

Please feel free to be a part of the project. Warning us of any bugs will be rewarded with a Cookie.

Now back to the BeagleBoard was indeed a great buy. Small and fast. Though the peripherals cost us quite much. We installed Angstrom Linux  distribution. Which could be found at http://www.angstrom-distribution.org/ . Being new in using the BeagleBoard we decided to use some of the sources at hand. We started with the site http://elinux.org/BeagleBoardBeginners . We ran into some problems.

Our first problem was that we did not have a AT-Everex cable to connect to the board. So we had to jump to Step 5 of the steps presented in the web-site.  Which is basicly Linux Boot Formatting the SDHC disc we bought for the board. I beg you please not to follow the steps at elinux.org instead follow http://code.google.com/p/beagleboard/wiki/LinuxBootDiskFormat . It is much more clear and you don’t get side stepped. Once we used the steps in formatting the SD disk in code.google.com we noticed we needed cable so we can tell the board where to boot from. So until we get that cable (or make one for our selves?) the project is at a halt. Just follow this blog for any more updates on the board and follow the Sourceforge.net ‘s for the changes on our code.

Peace!

import java.io.*;
import java.net.*;

//This program will listen to port 8189

public class ThreadedEchoServer{

 public static void main (String[] args){

 try{

 int i =1;
 ServerSocket s = new ServerSocket(8189);

 for (;;)
 {  
 Socket incoming = s.accept( );
 System.out.println("Spawning " + i);
 Thread t = new ThreadedEchoHandler(incoming, i);
 t.start();
 i++;
 }

 }catch (Exception e){

 e.printStackTrace();

 }

 }

}
/**
This class handles the client input for one server socket
connection.
*/
class ThreadedEchoHandler extends Thread
{
/**
 Constructs a handler.
 @param i the incoming socket
 @param c the counter for the handlers (used in prompts)
*/
public ThreadedEchoHandler(Socket i, int c)
{
 incoming = i; counter = c;
}

public void run()
{  
 try
 {  
 BufferedReader in = new BufferedReader
 (new InputStreamReader(incoming.getInputStream()));
 PrintWriter out = new PrintWriter
 (incoming.getOutputStream(), true /* autoFlush */);

 out.println( "Hello! Enter BYE to exit." );

 boolean done = false;
 while (!done)
 {  
 String str = in.readLine();
 if (str == null) done = true;
 else
 {  
 // out.println("Echo (" + counter + "): " + str);
 out.println("Connected to : " + str + "<br/>");
 //this is where you get the dang str!!! that is sent by embedded  device.
 //OR this is where you get the configurations from php server on the embedded device.
 System.out.println("Php server sent the following string :"+str);

 if (str.trim().equals("BYE"))
 done = true;
 }
 }
 incoming.close();
 }
 catch (Exception e)
 {  
 e.printStackTrace();
 }
}

private Socket incoming;
private int counter;
}

So we have finished with the Java code. Which both can be installed in the server or the embedded device. Notice that the port is  8189. Let us assume that this nice piece of work is on the embedded device. Now we have to send commands to and from the device via PHP using a telnet like protocol. That is when I started searching Google. Came up with a nice site http://www.geckotribe.com/php-telnet/

A nice site if you want to send data to and from telnet. And indeed it was what I needed. However I needed to do some modifications to the code they provided. The code below belongs to them;

(PHPTelnet.php)

<?php
/*
PHPTelnet
*/

class PHPTelnet {
 var $show_connect_error=1;

 var $use_usleep=1;    // change to 1 for faster execution default:0
 // don't change to 1 on Windows servers unless you have PHP 5
 var $sleeptime=125000;
 var $loginsleeptime=1000000;

 var $fp=NULL;
 var $loginprompt;

 var $conn1;
 var $conn2;

 /*
 0 = success
 1 = couldn't open network connection
 2 = unknown host
 3 = login failed
 4 = PHP version too low
 */
 function Connect($server,$user,$pass) {
 $rv=0;
 $vers=explode('.',PHP_VERSION);
 $needvers=array(4,3,0);
 $j=count($vers);
 $k=count($needvers);
 if ($k<$j) $j=$k;
 for ($i=0;$i<$j;$i++) {
 if (($vers[$i]+0)>$needvers[$i]) break;
 if (($vers[$i]+0)<$needvers[$i]) {
 $this->ConnectError(4);
 return 4;
 }
 }

 $this->Disconnect();

 if (strlen($server)) {
 if (preg_match('/[^0-9.]/',$server)) {
 $ip=gethostbyname($server);
 if ($ip==$server) {
 $ip='';
 $rv=2;
 }
 } else $ip=$server;
 } else $ip='127.0.0.1';

 if (strlen($ip)) {
 if ($this->fp=fsockopen($ip,8189))
 {

 if( ($user!="")&& ($pass!=""))
 {
 fputs($this->fp,$this->conn1);
 $this->Sleep();

 fputs($this->fp,$this->conn2);
 $this->Sleep();
 $this->GetResponse($r);
 $r=explode("\n",$r);
 $this->loginprompt=$r[count($r)-1];

 fputs($this->fp,"$user\r");
 $this->Sleep();

 fputs($this->fp,"$pass\r");
 if ($this->use_usleep) usleep($this->loginsleeptime);
 else sleep(1);
 $this->GetResponse($r);
 $r=explode("\n",$r);
 if (($r[count($r)-1]=='')||($this->loginprompt==$r[count($r)-1])) {
 $rv=3;
 $this->Disconnect();
 }

 }
 } else $rv=1;
 }

 if ($rv) $this->ConnectError($rv);
 return $rv;
 }

 function Disconnect($exit=1) {
 if ($this->fp) {
 if ($exit) $this->DoCommand('exit',$junk);
 fclose($this->fp);
 $this->fp=NULL;
 }
 }

 function DoCommand($c,&$r) {
 if ($this->fp) {
 fputs($this->fp,"$c\r");
 $this->Sleep();
 $this->GetResponse($r);
 $r=preg_replace("/^.*?\n(.*)\n[^\n]*$/","$1",$r);
 }
 return $this->fp?1:0;
 }

 function GetResponse(&$r) {
 $r='';
 do {
 $r.=fread($this->fp,1000);
 $s=socket_get_status($this->fp);
 } while ($s['unread_bytes']);
 }

 function Sleep() {
 if ($this->use_usleep) usleep($this->sleeptime);
 else sleep(1);
 }

 function PHPTelnet() {
 $this->conn1=chr(0xFF).chr(0xFB).chr(0x1F).chr(0xFF).chr(0xFB).
 chr(0x20).chr(0xFF).chr(0xFB).chr(0x18).chr(0xFF).chr(0xFB).
 chr(0x27).chr(0xFF).chr(0xFD).chr(0x01).chr(0xFF).chr(0xFB).
 chr(0x03).chr(0xFF).chr(0xFD).chr(0x03).chr(0xFF).chr(0xFC).
 chr(0x23).chr(0xFF).chr(0xFC).chr(0x24).chr(0xFF).chr(0xFA).
 chr(0x1F).chr(0x00).chr(0x50).chr(0x00).chr(0x18).chr(0xFF).
 chr(0xF0).chr(0xFF).chr(0xFA).chr(0x20).chr(0x00).chr(0x33).
 chr(0x38).chr(0x34).chr(0x30).chr(0x30).chr(0x2C).chr(0x33).
 chr(0x38).chr(0x34).chr(0x30).chr(0x30).chr(0xFF).chr(0xF0).
 chr(0xFF).chr(0xFA).chr(0x27).chr(0x00).chr(0xFF).chr(0xF0).
 chr(0xFF).chr(0xFA).chr(0x18).chr(0x00).chr(0x58).chr(0x54).
 chr(0x45).chr(0x52).chr(0x4D).chr(0xFF).chr(0xF0);
 $this->conn2=chr(0xFF).chr(0xFC).chr(0x01).chr(0xFF).chr(0xFC).
 chr(0x22).chr(0xFF).chr(0xFE).chr(0x05).chr(0xFF).chr(0xFC).chr(0x21);
 }

 function ConnectError($num) {
 if ($this->show_connect_error) switch ($num) {
 case 1: echo '<br />[PHP Telnet] <a href="http://www.geckotribe.com/php-telnet/errors/fsockopen.php">Connect failed: Unable to open network connection</a><br />'; break;
 case 2: echo '<br />[PHP Telnet] <a href="http://www.geckotribe.com/php-telnet/errors/unknown-host.php">Connect failed: Unknown host</a><br />'; break;
 case 3: echo '<br />[PHP Telnet] <a href="http://www.geckotribe.com/php-telnet/errors/login.php">Connect failed: Login failed</a><br />'; break;
 case 4: echo '<br />[PHP Telnet] <a href="http://www.geckotribe.com/php-telnet/errors/php-version.php">Connect failed: Your server\'s PHP version is too low for PHP Telnet</a><br />'; break;
 }
 }
}

return;
?>

However because I needed something that used a different port had to change the port number if you look at the comments in the form you will see where I edited the code.

Also because my Telnet was without a password ( i wanted to test it first) I added an “if” statement. Now to the index.php code;

<html><head><title></title></head><body>

<?php

require_once "PHPTelnet.php";

$telnet = new PHPTelnet();

// if the first argument to Connect is blank,
// PHPTelnet will connect to the local host via 127.0.0.1
// the second blank is for the username (may be for embedded device)
// the third blank is for the password (may be for embedded device)
$result = $telnet->Connect('','','');

if ($result == 0) {
$telnet->DoCommand('The embedded device!!', $result);
// NOTE: $result may contain newlines
echo $result;
$telnet->DoCommand('BYE', $result);
echo $result;
// say Disconnect(0); to break the connection without explicitly logging out
$telnet->Disconnect();
}

?>
</body></html>

Now to run a test; first run the Java program ( I hope you know how to compile and run a java program from console.) And than simply open index.php ( of course from Apache! ) And voilà!! you have a program that can connect directly to a php server page!!

Questions? Comments just send it in!