You can't use a system path as a url

eg. /var/www/html/mysite/index.php is not a valid url

http://mysite.com/index.php is a valid url

Instead of $CONFIG->pluginspath you need to be using elgg_get_site_url() and registering a pagehandler to server your pages.

Hi Matt,

I have added the page handler as you told..but i got a blank page only.

Below is my codes:

PAGE LINK

$downloadCpr =  $CONFIG->wwwroot. "pg/simpleusermanagement/downloadFile/".$vars['user']->guid;

<a href="'.$downloadCpr.'"><span>File Name</span></a>

PAGE HANDLER IN START.PHP

function simpleusermanagement_page_handler($page) {
        global $CONFIG;
        $guid = $page[1];
        if ($page[0]) {
            switch ($page[0]) {
            case "studentmanage":
                include($CONFIG->pluginspath . 'simpleusermanagement/index.php');
                break;
            case "facultymanage":
                include($CONFIG->pluginspath . 'simpleusermanagement/facultyindex.php');
                break;
            case "downloadFile":
                set_input('userId',$guid);
                include($CONFIG->pluginspath . 'simpleusermanagement/downloadFile.php');
                break;
            default:
                include($CONFIG->pluginspath . 'simpleusermanagement/index.php');
                break;
            }
        } else {
            include($CONFIG->pluginspath . 'simpleusermanagement/index.php');
            return true;
        }
    }

downloadFile.php

<?php
require_once(dirname(dirname(dirname(__FILE__))) . '/engine/start.php');
global $CONFIG;
 $guid = get_input('userId');
$user = get_entity($guid);
print_r($user);


echo $cprfilename =$user->cprfile;
$cprPath = $CONFIG->site->url."mod/imam_users/documents/students/cpr/".$guid."/".$cprfilename;
echo $fullPath = $cprPath;

if ($fd = fopen ($fullPath, "r")) {
   echo "$$". $fsize = filesize($fullPath);
    $path_parts = pathinfo($fullPath);
    $ext = strtolower($path_parts["extension"]);
    switch ($ext) {
        case "pdf":
        header("Content-type: application/pdf"); // add here more headers for diff. extensions
        header("Content-Disposition: attachment; filename=\"".$path_parts["basename"]."\""); // use 'attachment' to force a download
        break;
        default;
        header("Content-type: application/octet-stream");
        header("Content-Disposition: filename=\"".$path_parts["basename"]."\"");
    }
    header("Content-length: $fsize");
    header("Cache-control: private"); //use this to open files directly
    while(!feof($fd)) {
        $buffer = fread($fd, 2048);
        echo $buffer;
    }
}
fclose ($fd);
exit;
?>

I got the userid in this page. But didint get the user with the code

 $guid = get_input('userId');
$user = get_entity($guid);
print_r($user);

Why it happened like this.. My output is a blank white screen only..

Please suggest a solution

Thanks and regards

On an intital review I would say you probably don't need 

require_once(dirname(dirname(dirname(__FILE__))) . '/engine/start.php');
global $CONFIG;

In your download.php, this is included when you call the download.php in the pagehandler.  

Also please check that in the .htaccess that you are outputting PHP errors by default this is swtiched off. You can also turn this on in /admin/settings/advanced

When you save the file are you using the filehanlder object? The way I understand how elgg works with files. You save the file using the filehanlder.  This object then saves the file to the filestore and creates an entity in the database you can referrance.

You the create a pagehandler for the request of the the file which because it is inherited from a filehanlder object it will take care of the file headers.

Blank white screen means php fatal error

pg/simpleusermanagement/downloadFile/".$vars['user']->guid;

Are you using 1.7?  you don't need the 'pg' prefix in 1.8

There's a good example of how to do this in the core files plugin

I edited the title to be more descriptive.