[support] how to access filefield with hook_nodeapi

Hello,

First of all I would like to thank this lits for all the support I am receiving.

I am writing my first module. I would appreciate any help with my question.

I have created a content type called application. I am using two text fields and one filefield with this content type created using CCK. I am writing a custom module that does some operation on this node type when it is being created. Therefore I am using hook_nodeapi() in my custom module.

function loadapp_nodeapi(&$node, $op, $a3 = NULL, $a4 = NULL){ switch ($op) { case'submit': // Do operations here break; } }

I want to extract some information from this uploaded file and perform few other operations when the node is being created. I believe this be done with hook_nodeapi(). But how is the question. How can I access the filefield field when $op is 'submit'?