Drupal - Get image from url and import it into node

Im writing a module for drupal, Im trying to create a node from my module, everything is fine , I only have 1 problem with creating an image , The image exist on different server, so I want to grab the page and insert it , I install module http://drupal.org/project/filefield_sources , which has remote option , I sear开发者_StackOverflow社区ch in the module code , I could not find the function that he used for this process, module work very nice from interface , but how i make it do the job from code ? which function should i call and what parameter should i pass .

I'm over Drupal 6.

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Hopefully you're using Drupal 7...

The system_retrieve_file() function will download a file from a remote source, copy it from temp to a specified destination and optionally save it to the file_managed table if you want it to be managed.

$managed = TRUE; // Whether or not to create a Drupal file record
$path = system_retrieve_file($url, 'public://my_files/', $managed);

If you want to get the file object immediately after you've done this, the following is the only way I've found so far:

$file = file_load(db_query('SELECT MAX(fid) FROM {file_managed}')->fetchField());

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get fid using $path->fid. no need to mysql