Thumbnail Creation Plugin

[pornogott]

Hello,

my name is Daniel and i´m new at the VBulletin community. I want to develop a FTP Image Upload using the proftpd FTP Server with MySQL Server Extension.

I planned the following step

1) User create a album
2) Sending FTP Data via eMail to the user
3) After a period of 24 the account ist closed via Cron-Job
4) All images he uploaded in the folder get inserted into the database
5) Finally, the user see the result in his own album.

I have some trouble with the Thumbnail creation. The photo is written to the database via bitstream. But i don´t know which function in vbulletin is used for this "generation" of bytes.
All my bitstream of images are broken and i can´t see the correct image.

Does anybody know how to add a photo where easily to the database. I searching a kind of API or class functions.

Thanks for your help.

Daniel