You probably mean the upload_hook() method. The following is right from the CGI.pm docs:

You can set up a callback that will be called whenever a file upload is being read during the form processing. This is much like the UPLOAD_HOOK facility available in Apache::Request, with the exception that the first argument to the callback is an Apache::Upload object, here it's the remote filename.

$q = CGI->new();
$q->upload_hook(\&hook,$data);

sub hook
{
       my ($filename, $buffer, $bytes_read, $data) = @_;
       print  "Read $bytes_read bytes of $filename\n";
}
[download]

Make sure you have the latest version of CGI.pm installed, as I think this was just added in the 3.x version.

- Cees

Hey tar for this!
I really did RTFM and I googled. I queried perlmonks!! One waits in vain for Burner-Lees semantic web when I can better find answers like this.
I really wish I had some advice to contribute back. Likely I don't!
Ah yes I do : be careful with Apache::Session. if you use Apache::Session with File, and you set a directory for it to keep its session data in, make sure it exists or else it hangs without explaining why when you start the server. Use File not Semaphore locking as we seemed to get deadlock with semaphores.
I know that has naught to do with CGI.
-tdg

Is it possible to send a form post without a CONTENT_LENGTH ? I thought ENV{CONTENT_LENGTH} was always sent?