Joomla component + forcedownload - php

Question

i have coded a component (Gallery). And i want to intergrate forcedownload for all items.
But will not work :(, just getting corrupted files. I have tried to use exact same code and run it outside of joomla and its works fine. I have created a template thats totaly empty just
have but its not help.
My (com_component/views/forcedownload/tmpl/default.php)
<?php
if(!isset($_GET["id"]) || empty($this->item)) {
echo "Invalid request";
die();
}
$path = "images/randomtest/catid".$this->item->cat_id."/";
$filename = $path.$this->item->filename;
$file = $this->item->filename;
if(!file_exists($filename)) {
echo "Error: File not found";
die();
}
header("Cache-Control: public");
header("Content-Description: File Transfer");
header("Content-Disposition: attachment; filename=$file");
header("Content-Type: Content-type: application/octet-stream");
header("Content-Transfer-Encoding: binary");
header("Content-Length: ".filesize($filename));
readfile($filename);
?>

Answer 1

The first thing is: Are you using $_GET['format'] = raw? If not in your controller do
if(!isset($_GET["format"]) || $_GET["format"]!='raw') {
$this->setRedirect( JURI::current(). '?format=raw' );
return false;
}
also in your header you are declared content type as: application/octet-stream, are you sure you want this?
also here:
$path = "images/randomtest/catid".$this->item->cat_id."/";
you need, whole SYSTEM PATH not only local one, try using:
$path = JPATH_SITE."/images/randomtest/catid".$this->item->cat_id."/";