Return image from controller in symfoy2 - symfony

Question

I've looked at this question but it doesnt work for me.
my controller looks like:
/**
* #Route("/testing")
*/
public function trackingNewsletter() {
$filename = 'T:\wamp\www\trendytouristmx\web\uploads\establishments\1-37.jpg';
$response = new \Symfony\Component\HttpFoundation\Response();
$response->headers->set('Cache-Control', 'private');
$response->headers->set('Content-type', mime_content_type($filename));
$response->headers->set('Content-Disposition',
'attachment; filename="' . basename($filename) . '";');
$response->headers->set('Content-length', filesize($filename));
$response->sendHeaders();
$response->setContent(file_get_contents($filename));
return $response;
}
But in the browser code is displayed instead of the image displayed:
browser looks like this
Thank you.

Answer 1

There is a special class which is designed for binary file response. I would recommend to use it instead. More info BinaryFileResponse
//$filePath = ...
//$filename = ...
$response = new BinaryFileResponse($filePath);
$response->trustXSendfileTypeHeader();
$response->setContentDisposition(
ResponseHeaderBag::DISPOSITION_INLINE,
$filename,
iconv('UTF-8', 'ASCII//TRANSLIT', $filename)
);
return $response;

Answer 2

You have to do :
public function trackingNewsletter() {
$path = 'T:\wamp\www\trendytouristmx\web\uploads\establishments\1-37.jpg';
$response = new Symfony\Component\HttpFoundation\Response();
$response->headers->set('Content-type', mime_content_type($path));
$response->headers->set('Content-length', filesize($path));
$response->sendHeaders();
$response->setContent(readfile($path));
}

Answer 3

Thank you #chalasr, finally it works, here's a solution:
first, I removed $response->headers->set('Cache-Control', 'private');
second, I changed the value of Content-Disposition from attachment to inline.
/**
* #Route("/tracking")
*/
public function trackingnewsletterAction() {
$filename = '...\establishments\1-39.jpg';
$response = new \Symfony\Component\HttpFoundation\Response();
$response->headers->set('Content-type', mime_content_type($filename));
$response->headers->set('Content-Disposition',
'inline; filename="' . basename($filename) . '";');
$response->headers->set('Content-length', filesize($filename));
$response->sendHeaders();
$response->setContent(file_get_contents($filename));
return $response;
}