test for file download fully complete

acollins

I use the following code, which opens the brower's file save dialogue box, to enable a client to download a file from my site.

I need to confirm that the download ran to completion i.e. the cancel button was not pressed, nor was the connection lost during the process.

How may I modify my code so that I can test
for completion of the file transfer?

My current code is:

  $size = filesize($download_file_name); 
  $fp = fopen($download_file_name,"rb");
  header("Expires: 0");
  header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
  header("Pragma: public"); 
  if (strstr($HTTP_USER_AGENT, "MSIE")){ 
    header("Content-Type: application/save"); 
  } 
  else { 
    header("Content-Type: application/octet-stream"); 
  } 
  header("Content-Disposition: attachment; filename=$download_file_name"); 
  header("Content-Length: $size"); 
  header("Content-Transfer-Encoding: binary"); 
  fpassthru($fp);

Thank you for replying.

majik-sheff

Untested but should work:

$size = filesize($download_file_name);
$fp = fopen($download_file_name,"rb");

header("Expires: 0");
header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
header("Pragma: public");
if (strstr($HTTP_USER_AGENT, "MSIE")){
header("Content-Type: application/save");
}
else {
header("Content-Type: application/octet-stream");
}
header("Content-Disposition: attachment; filename=$download_file_name");
header("Content-Length: $size");
header("Content-Transfer-Encoding: binary");

$stdout = fopen("php://stdout", "w");
$bytesWritten = fwrite($stdout, $size);

$bytesWritten should equal $size if everything went well, so check for that to get your status.

acollins

Sorry, the previous solution does not work. The file download dialogue box opens OK but it reports that 0 bytes were transferred on completion ($bytesWritten was = 5).

majik-sheff

I know, I realized a little bit ago that I gave you incomplete code, sorry 🙁 On top of that, I just tested my idea on code that should work and it still doesn't. There appears to be a bug in the way PHP handles stdout in the server module build versus the CGI build. I'm gonna pass it on to the dev list to see what can be done... Hate to get your hopes up like that. 🙁