Download image with Zend - PHP header: wrong file format - php

Question

First of all, I know this question has already been asked but I can't solve it anyway.
I need to set a link to download images(jpg).
I read various posts found here and with google but it's always the same results:
I can download the file but it's still the same error. The jpeg format is not correct.
Erreur d'interprétation du fichier
d'image JPEG (Not a JPEG file: starts
with 0x0a 0x20)
When I test this in a file without a controller, it's ok but the script in a controller doesn't work.
Here is the code for tests:
$file = '{document_root}/www/themes/default/images/common/background1.jpg';
if (file_exists($file))
{
header('Content-type: application/octet-stream');
header('Content-Disposition: attachment; filename=' . basename($file));
header('Content-length: ' . filesize($file));
readfile($file);
exit;
}
This code works in a simple php file. I download the picture and can open it.
But within my controller, the file is not good.
I found that the tag ?> can add spaces but my controllers doesn't have this closing tag.
I've tested some code with the Zend objects found in various posts but it's the same error.
I've tried various way to read the file (file_get_content(), fread() ...) with the same result.
I assume there's something wrong with my Zend controller.
I'm now testing my file according to this post:
php file download: strange http header
Any clue will be really appreciated.
Thanks for your help and sorry for my bad english.
[EDIT: 21/06/2011 - 6h38]
Here is the code of the action
public function downloadAction()
{
$this->view->layout()->disableLayout();
$this->_helper->viewRenderer->setNoRender(true);
$img = $this->_getParam('img');
// Process the file
$config = Zend_Registry::get('config');
$width = $config->catalog->image->original->maxWidth;
$height = $config->catalog->image->original->maxHeight;
$prefix = $width . 'x' . $height . '_';
$filename = $prefix . $img;
$file = Zend_Registry::get('document_root') . '/data/images/catalog/products/' . $this->_getParam('pid') .'/'. $filename;
if (file_exists($file))
{
$this->getResponse()
->setHeader('Content-Disposition', 'attachment; filename='.$filename)
->setHeader('Content-Transfer-Encoding', 'binary')
->setHeader('Content-Length', filesize($file))
->setHeader('Content-type', 'image/jpeg');
$this->getResponse()->sendHeaders();
readfile($file);
exit;
}
}
This action is not called directly. I test if a parameter exists in the url.
If true then from the listAction, I call the downloadAction().
I've tried to disable the view and layout in both action but there's some html rendered.

Answer 1

I had the same problem sending content after decrypt file's content.
0x0a means new line. You probably have some new line after the ?> tag in some included class.
Put
ob_clean();
flush();
before
readfile($file);
something like this:
header('Content-type: application/octet-stream');
header('Content-Disposition: attachment; filename=' . basename($file));
header('Content-length: ' . filesize($file));
ob_clean();
flush();
readfile($file);
exit;
This work out fine for me. Hope it helps.
Regards

Answer 2

I codeing working zend framework :)
public function dowloadfileAction(){
$this->_helper->viewRenderer->setNoRender(true);
$this->_helper->layout->disableLayout();
if ($this->_user->isUserLogin()) {
$path_file = 'public/uploads/file/';
$filename = $this->_getParam('file');; // of course find the exact filename....
$file = $path_file.$filename;
//zfdebug(mime_content_type($file)); die();
if (file_exists($file)) {
header('Pragma: public');
header('Expires: 0');
header('Cache-Control: must-revalidate, post-check=0, pre-check=0');
header('Cache-Control: private', false); // required for certain browsers
header('Content-Type: '.mime_content_type($file));
header('Content-Disposition: attachment; filename="'. basename($file) . '";');
header('Content-Transfer-Encoding: binary');
header('Content-Length: ' . filesize($file));
readfile($file);
}else{
echo "File does not exist";
}
}else{
echo "Please Login";
}
exit;
}