How to edit a post by code ?

[developpez.com]

Hello everyone,

I'm wondering how to edit a specified post using the vbulletin api.

I can create a post by code by using

$post = new vB_DataManager_Post($vbulletin, ERRTYPE_STANDARD);	
$post->do_set(..., ...);
$postid = $post->save();

but how can i edit a post ? I've tried

$post = new vB_DataManager_Post($vbulletin, ERRTYPE_STANDARD);	
$post->set_existing(fetch_postinfo($postid));

$post->do_set('pagetext', $message);
$post->save();

but it doesn't seem to work. What is the correct way to do it ?