问如何在Symfony2控件中获取表单值

EN

public function loginAction(Request $request)
{
    $user = new SiteUser();
    $form = $this->createForm(new LoginType(), $user);


    if ($request->getMethod() == 'POST') {
        $form->bindRequest($request);
        $data = $form->getValues();
        // Need to do something with the data here
    }

    return $this->render('GDSiteBundle::header.html.twig', array('form' => $form->createView()));
}

<div class="form">
    {{ form_errors(form) }}
    <form action="{{ path('site_user_login') }}" method="POST" {{ form_enctype(form) }}>
        <div class="level1">
            {{ form_row(form.username) }}
            <a href="javascript:void(0)" id="inscription">{% trans %}Registration{% endtrans %}</a>
        </div>
        <div class="level2">
            {{ form_row(form.pwd_hash) }}
            <div class="forget_pass"><a href="#" id="frgt">{% trans %}Forgot Password ?{% endtrans %}</a></div>
        </div>
        <input type="submit" class="submit" name="login" value/>
        <div class="clr"></div>
    </form>
</div>

public function buildForm(FormBuilder $builder, array $options)
{
    $builder->add('username', 'text', array('label' => 'Username : '));
    $builder->add('pwd_hash','password', array('label' => 'Password : '));
}

site_user_login:
    pattern: /{_locale}/login
    defaults: {_controller: GDSiteBundle:SiteUser:login}