[development] D7 File API

[Peter Anderson]

Hi everyone,

I'm upgrading my D6 module to D7 and am trying to work out the best way 
to implement the new File API...
My module allows users to either upload a file from their computer, or 
enter the relative path of a file already on the server (e.g. 
/sites/default/themes/...). The relative path to this file is then 
stored in the DB.

I'm not sure what to store in the database in the D7 version: the file 
URI (public://my_file.png) or the relative path as per the D6 version 
(/sites/default/files/my_file.png).
The reasons I'm not sure are as follows:
- Storing the File URI seems to be the obvious choice as that seems to 
be the default now
- But how would I allow users to enter the path of a file already on the 
server in, say, their theme folder?
- Storing the relative path is how I used to do it, so is easier
- But then how do I change a relative path to a File URI when required 
(e.g. by the image_style_url() function)?

Any assistance or advice would be much appreciated!

-- 
Kind regards,
Peter Anderson.
http://panda.id.au

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