Hi,
I've maked a client that send some strings to a soap server and it works fine. Now I've to send a file too. This is the related wsdl part:

<wsdl:part name="email" type="xsd:string"/>
<wsdl:part name="p0" type="xsd:string"/>
<wsdl:part name="dh" type="apachesoap:DataHandler"/>

My client is client.php:

<?php
/*
...
 SOME STUFF
...
*/

require 'assets/lib/nusoap.php';

$email = $_POST['email'];
$tmpZip = 'tmp/uploaded_files.zip';
$p0 = $_POST['p0'];

//instantiate the NuSOAP class and define the web service URL:
$client = new nusoap_client('http://xyz.mydomain.com:8080/web10/services/web10?wsdl');
$client->soap_defencoding = 'UTF-8';
$client->decode_utf8 = false;

//check if there were any instantiation errors, and if so stop execution with an error message:
$error = $client->getError();

if ($error) {
    die("client construction error: {$error} \n");
}

$user = 'frank';
$psw = 'frank2013';

//authenticate to the service:
$client->setCredentials($user, $psw);

//file part
$tmpfile = BASE_PATH.'/'.$tmpZip;
$handle = fopen($tmpfile, "r");                  // Open the temp file
$contents = fread($handle, filesize($tmpfile));  // Read the temp file
fclose($handle);

//perform a function call with parameters:
$param = array(
    'email' => $email,
    'p0' => $p0,
    'dh' => $contents
);

$answer = $client->call('newContact', $param, '', '', '', true, 'rpc', '');

//check if there were any call errors, and if so stop execution with some error messages:
if ($client->fault) {
    echo '<h2>Fault</h2><pre>';
    print_r($answer);
    echo '</pre>';
} else {
    $err = $client->getError();
    if ($err) {
        echo  $err ;
    } else {
        //echo substr($answer, 46, 2);
        echo $answer;
    }
}

If I remove the file part, it send correctly the two strings. How can I send the file?
Thank you very much