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Accessing geo-nick from a php-gtk2 application

Sun, 03/12/2006 - 20:29 — Frédéric G. Marand

The previous page defined the geo-nick API of the PHP-GTK.eu site. Here is a small example of how to use it from a client application, using either the CURL library, or native PHP coding to send the request and retrieve the XML-RPC results from the site.

<?php
if (!class_exists('gtk'))
  {
  die("Please load the php-gtk2 module in your php.ini\r\n");
  }

/**
* This shows how to invoke an XML-RPC service using CURL
*/
function do_call_curl($host, $port, $backend, $request)
  {
  $url = "http://$host:$port/$backend";
  $header[] = "Content-type: text/xml";
  $header[] = "Content-length: ".strlen($request);

  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($ch, CURLOPT_TIMEOUT, 1);
  curl_setopt($ch, CURLOPT_HTTPHEADER, $header);
  curl_setopt($ch, CURLOPT_POSTFIELDS, $request);
  $data = curl_exec($ch);
  if (curl_errno($ch)) {
    print curl_error($ch);
    }
  else
    {
    curl_close($ch);
     return $data;
    }
  }

/**
* This shows how to invoke an XML-RPC service
* using stream wrappers, without CURL
*/
function do_call_raw($host, $port, $backend, $request)
  {
  $url = "http://$host:$port/$backend";
  $params = array
    (
    'http' => array
      (
      'method' => 'POST',
      'content' => $request,
      'header'  => array
        (
        'Content-type'   => 'text/xml',
        'Content-length' => strlen($request),
        ),
      )
    );
  $ctx = stream_context_create($params);
  $fp = @fopen($url, 'rb', false, $ctx);
  if (!$fp)
    {
    throw new Exception("Problem with $url, $php_errormsg");
    }
  $response = @stream_get_contents($fp);
  if ($response === false)
    {
    throw new Exception("Problem reading data from $url, $php_errormsg");
    }
  return $response;
  }

/**
* Prepare the request data
*/
$host    = 'www.php-gtk.eu';
$port    = 80;
$backend = 'xmlrpc.php';

/**
* encode them to XML
*/
$request = xmlrpc_encode_request('gtkphpnet.geo_nick', '', 10);

/**
* Send the request: we could just as well use do_call_curl
* with the same parameters
*/
$response = do_call_raw($host, $port, $backend, $request);

/**
* Now parse the results to native PHP
*/
$res = xmlrpc_decode($response);

/**
* and display them in a PHP-GTK2 window
*/
$window = new GtkWindow();
$window->set_title('www.php-gtk.eu geo-nick service');
$window->connect_simple('destroy', array('Gtk','main_quit'));
$textBuffer = new GtkTextBuffer();
$textBuffer->set_text(print_r($res, true));

$textView   = new GtkTextView();
$textView->set_buffer($textBuffer);
$textView->set_editable(false);

$window->add($textView);
$window->show_all();
Gtk::main();
?>

If your configuration does not include the standard XML-RPC extension, you can still use the Pear XML-RPC, as in the Accessing geo-nick without native XML-RPC example. Although arguably slower, the Pear XML-RPC library has frees you from the issue of sending/retrieving the XML messages.