How to detect if file download completed or cancelled

I have a large install file (an exe) on my web server that people
download and install from. Looking at my log files, I see a lot of
people downloading it, but no way to tell for sure if they completed the
download or cancelled out before it completed. Is there any function in
PHP that would allow the web server to send the file and detect a
completion or cancellation? Or perpahs a javascript/PHP method?

Any help would be greatly appreciated.
Thanks,
Dan

You could check the byte count in the web server log to see if the
whole file was transferred.

In PHP, you could also do this by checking connection_aborted() after
sending the file. For example:

ignore_user_abort(true); // Don't end if the connection breaks

if (readfile($path) !== false && !connection_aborted()) {
// Success!
}

Here's a larger example. The function sendFile returns the status of
the download:

<?

// Sample usage

function sendTest()
{
$res = sendFile('application.exe', 'application/octet-stream');

if ($res['status']) {
// Download succeeded
} else {
// Download failed
}

@saveDownloadStatus($res);
}

// The sendFile function streams the file and checks if the
// connection was aborted.

function sendFile($path, $contentType = 'application/octet-stream')
{
ignore_user_abort(true);

header('Content-Transfer-Encoding: binary');
header('Content-Disposition: attachment; filename="' .
basename($path) . "\";");
header("Content-Type: $contentType");

$res = array(
'status' =false,
'errors' =array(),
'readfileStatus' =null,
'aborted' =false
);

$res['readfileStatus'] = readfile($path);
if ($res['readfileStatus'] === false) {
$res['errors'][] = 'readfile failed.';
$res['status'] = false;
}

if (connection_aborted()) {
$res['errors'][] = 'Connection aborted.';
$res['aborted'] = true;
$res['status'] = false;
}

return $res;
}

// Save the status of the download to some place

function saveDownloadStatus($res)
{
$ok = false;
$fh = fopen('download-status-' . $_SERVER['REMOTE_ADDR'] . '-' .
date('Ymd_His'), 'w');
if ($fh) {
$ok = true;
if (!fwrite($fh, var_export($res, true))) {
$ok = false;
}
if (!fclose($fh)) {
$ok = false;
}
}
return $ok;
}

Dan D wrote:

Thank you very much. That looks like it should work great. I'll give it
a try.
Dan

petersprc@gmail.com wrote: