Question

When I go to /fileDownload I receive a 500 Internal Server Error – RuntimeException:

The process stopped because of a “0” signal.

Controller Action:

public function fileAction()
{
    $html = $this->render('MyBundle:Downloads:file.html.twig', array(
    'fileNumber'  => '1234'
    ));

    return new Response(
        $this->get('knp_snappy.pdf')->getOutputFromHtml($html),
        200,
        array(
            'Content-Type'          => 'application/pdf',
            'Content-Disposition'   => 'attachment; filename="file.pdf"'
        )
    );
}

I’ve used terminal commands for WKHTMLTOPDF and it has successfully generated the PDF. It just will not work in Symfony2 app.

In my config.yml:

knp_snappy:
    pdf:
        enabled:    true
        binary:     /usr/local/bin/wkhtmltopdf
        options:    []

Answer 1

I’m assuming Symfony is issuing an exec() at some stage. You need to get the exact command line error returned. The fact it works for you in a terminal session doesn’t necessarily mean it will work when a different user/process is running it.

Check permissions on wkhtmltopdf that apache or whoever is running your web server has access to run the command.

Also, check this question out wkhtmltopdf: cannot connect to X server and also the first post here: http://geekisland.org/index.php?m=05&y=11&entry=entry110518-114630

X Server is required to run certain builds of wkhtmltopdf and it is not present when running via cron or from within an apache process. If this is the case you need to use the bash wrapper in the first link above.