Upload image xmlrpc Wordpress and assign a post_parent

I am using wp.uploadFile to upload an image, once climb need to assign a post_parent, DO NOT seek to be added as a featured picture, but it is assigned the ID of the post where he was raised.

If I add as outstanding image then edited the post at the wp_posts table and post_parent field is 0.

I tried this:

    include_once('IXR_Library.php');

    $client = new IXR_Client('http://ift.tt/1Bn1FDQ');
    $username='demo'; $password='demo';

    $content = array(
        'post_status' => 'draft',
        'post_type' => 'post',
        'post_title' => 'Title',
        'post_content' => 'Message',
         // categories ids
        'terms' => array('category' => array(6))
    );
    $params = array(0, $username, $password, $content);
    $client->query('wp.newPost', $params);
    $post_id = $client->getResponse();

    $content = array(
        'name' => basename('http://ift.tt/1FFwe6H'),
        'type' => 'image/jpeg',
        'bits' => new IXR_Base64(file_get_contents('http://ift.tt/1FFwe6H')),
        true,
    );
    $client->query('metaWeblog.newMediaObject', 1, $username, $password, $content);
    $media = $client->getResponse();

And so

    $content = array(
        array(
        'name' => basename('http://ift.tt/1Bn1Leq'),
        'type' => 'image/jpeg',
        'bits' => new IXR_Base64(file_get_contents('http://ift.tt/1Bn1Leq')),
        'overwrite' => true,
        'post_id' => $post_id
        )
    );
    $client->query('wp.uploadFile', 1, $username, $password, $content);
    $clientResponse = $client->getResponse();
    print_r($clientResponse);

The first code uploads the image but not assigned to the post and the second gives error "Array ([faultCode] => 500 [faultString] => Could not write file (Empty filename))"

Any idea? Thanks.