How to call joomdle web service functions in my own service

Hi, i'm trying to call joomdle_get_moodle_users from my service in this way... but there is something wrong, could anyone help me? thanks

function getAllMoodleUser($limitstart) {
$this->error = null;

// Create XML for the request. XML must be set properly for this to work.
$request = xmlrpc_encode_request('joomdle_get_moodle_users', (int)$limitstart);

$context = stream_context_create(array('http' => array(
'method' => "POST",
'header' => "Content-Type: text/xml",
'content' => $request
)));

$path = $this->server.$this->dir."/webservice/xmlrpc/server.php?wstoken=".$this->token;


// Send XML to server and get a reply from it.
$file = file_get_contents($path, false, $context); // $file is the reply from server.
// Decode the reply.
$response = xmlrpc_decode($file);
return $response;

}


my goal is get the list of all moodle users

hi, i'm trying to call from an external scritp

first of all, is that the right way to call this function?

I've also tryied with
$request = xmlrpc_encode_request('joomdle_get_moodle_users', array('limitstart' =>0, 'limit' => 5, 'order' => 'desc', 'order_dir' => '', 'search' => ''),array('encoding'=>'UTF-8'));


but this doesn't work.... moreover i don't know the correct values for 'order', 'order_dir' and 'search' text fields

The problem is that the response is
array (size=2)
'faultCode' => int 404
'faultString' => string 'Unknown error' (length=13)
null

i took a look to the implementation of get_moodle_users() in auth.php script.
it take these parameters and build an sql query... my request is

$request = xmlrpc_encode_request('joomdle_get_moodle_users',array('limitstart' =>0, 'limit' => 5, 'order' => 'name', 'order_dir' => 'desc', 'search' => ''),array('encoding'=>'utf8'));

and the error is: "parameters do not match signature | ERRORCODE: 1"

thanks but it still doesn't work

$request = xmlrpc_encode_request('joomdle_get_moodle_users',array('limitstart' => (int)0, 'limit' => (int)5, 'order' => (string)'name', 'order_dir' => (string)'', 'search' => (string)''),array('encoding'=>'utf8'));