file download using for a plugin

Hi all,

I am developing a plugin for role based file download, for downloading the file i am using template_redirect hook. The problem i am facing is, i couldn’t push the file to the client using readfile() php function (even the small files). When i try to push the file it is giving me a file not found error [Error 6 (net::ERR_FILE_NOT_FOUND)] but if i tried to check the file using file_exists() function it shows the file is present(using the same path which i gave to readfile() function as a param).

code:

header(‘Content-Type: application/pdf’);
header(“Content-Type: application/force-download”);
header(‘Content-Disposition: attachment; filename=filename.pdf’);
readfile(filepath);

NOTE: I have tried many header options but still nothing happens

Please help me to find where i am wrong..