C++ Trouble with writing files

[jiminikiz]

Okay firstly, I hate to start a new topic if the question is already answered somewhere (or post this in the wrong area), but I have been looking to solve this very simple question for quite some time now and have found no simple answer.

 

I am trying to run an already compiled and working C++ program from the browser. It will take some string parameters and call a command similar to this:

 

" ./Program name1 id1 name2 id2 0 "

 

This works fine in a linux shell terminal, but not when called from the browser using any kind of PHP execution call (including shell_exec(), exec(), pipe(), etc.) I would always get a "Segmentation Fault". I figured it had to deal with the fact that the program is writing to a text file.

 

Okay, so I wrote a super trivial program to see if I can write a string to a textfile when the program is called from the browser.

#include <iostream>
#include <fstream>
using namespace std;

int main () 
{ ofstream myfile;
  cout << "Creating File... (hello.txt)\n";
  myfile.open ("hello.txt");
  cout << "Writing to File...\n";  
  myfile << "Writing -crap- to this to a file.\n";
  cout << "Closing File...\n";  
  myfile.close();
  return 0;
}

 

I am calling this code from the browser using:

 

  $command = "./hello";
  $output =  shell_exec($command." 2>&1") ;
  echo(nl2br($output));

 

Only the print statements reach the browser window. No text file is created. No errors are generated (or at least not reported in the browser window) and this program definitely works when compiled and run natively.

 

Now I understand I could easily create and write to text files using PHP, but I just need to figure out how to allow a C++ program to create/read/write/delete files when executed from the PHP execution functions. The program that I am trying to run (not the trivial one posted here) creates many text files, and again, works perfectly fine when run from the terminal. I have tried setting all the permissions to 755.

 

I am trying to do this locally (localhost) using XAMMP in linux.

 

Thank you in advance!

[Daniel0]

Works fine for me:

 

daniel@daniel-laptop:~/test$ ls
hello.cpp  test.php
daniel@daniel-laptop:~/test$ cat hello.cpp 
#include <iostream>
#include <fstream>
using namespace std;

int main ()
{ ofstream myfile;
  cout << "Creating File... (hello.txt)\n";
  myfile.open ("hello.txt");
  cout << "Writing to File...\n"; 
  myfile << "Writing -crap- to this to a file.\n";
  cout << "Closing File...\n"; 
  myfile.close();
  return 0;
}
daniel@daniel-laptop:~/test$ g++ hello.cpp -o hello
daniel@daniel-laptop:~/test$ cat test.php
<?php
$command = "./hello";
$output =  shell_exec($command." 2>&1") ;
echo $output;
?>
daniel@daniel-laptop:~/test$ php -v; php test.php
PHP 5.3.3-dev (cli) (built: Mar 23 2010 10:24:53) 
Copyright (c) 1997-2010 The PHP Group
Zend Engine v2.3.0, Copyright (c) 1998-2010 Zend Technologies
    with Xdebug v2.0.5, Copyright (c) 2002-2008, by Derick Rethans
Creating File... (hello.txt)
Writing to File...
Closing File...
daniel@daniel-laptop:~/test$ ls
hello  hello.cpp  hello.txt  test.php
daniel@daniel-laptop:~/test$ cat hello.txt 
Writing -crap- to this to a file.

[jiminikiz]

I really appreciate your swift reply. I haven't tried that method, and you are right, running that command from the command line also works on my system...

 

However, I guess what my problem really is lies in the attached code, when run in a web browser does not work. All I see are <<cout>> statements.

 

To run the code, I am just clicking the search button for method1 in search.php Calls method1.php

 

 

[attachment deleted by admin]

[jiminikiz]

NVM

 

chmod 777 makes everything work.

 

I fear great security risk. But I will worry about that later.

 

Thanks again.