Re^3: CGI hook

[Zaxo]

In my CGI.pm, that passage reads,

           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";
        }

The hook is not an argument to new, but is set in the upload_hook method.

[rhesa]

It was added as an option to new() in version 3.12. For versions before that, you are right. Current version is 3.20 btw.

[imp]

Timeline for upload_hook support:
• 3.01 - upload_hook support added
• 3.03 - support for upload_hook configuration in new() added
• 3.12 - documentation updated to reflect change that was made in 3.03
Found the correction for 3.12 by checking the change list:

[cees]

That example in the CGI.pm docs never worked right. upload_hook can only be used as a function call, not as a method call. This is because when you create a new CGI object, it immediately calls 'init' which parses the request information, and that includes handling any file uploads. So by the time new returns, the file upload has already been handled and hence it is too late to set up the upload hook. That is why it was changed so that you pass the upload hook as a parameter to new.

However, when using the functional interface you can use the upload_hook function, as long as you call it before you make any other calls.