Accessing an offline player's inventory?

Is it possible to access a offline players inventory without the use of craftbukkit.jar?

I need this to make a plugin for my dad that can convert money into emeralds.

 

You would have to save each player's inventory somehow when they leave the server, maybe you could use flatfile storage if you looked into this: http://forums.bukkit.org/threads/serialize-inventory-to-single-string-and-vice-versa.92094/

 

For what I am doing I don't want to do through a lot of complicated file writing and file reading. Is there any direct way to do this?

 

You could read the player's NBT file. That's a lot more complicated, though. You'll have to ask Bukkit to add support for OfflinePlayer inventory access.

 

OpenInv does this. You might want to check out their plugin:
http://dev.bukkit.org/server-mods/openinv

 

I once saw a library on the Bukkit forums designed to make this type of thing easier. I think it was called something along the lines of BetterOfflinePlayer.

 

I've looked at that and it needed the craftbukkit.jar

 

You're right; I probably should have mentioned that in my post. I was just letting you know of a tool which might make it a bit easier for you, but I don't think it's possible to accomplish what you want to without using NMS code.