I have been browsing the web for about 3 hours now and I still haven't found a way to add GUI to an item. I desperately need help here. Can anyone link me an updated tutorial, or even an open source mod that does so? (I don't need to get the player inventory, I am just trying to display something like a book, for my mod's "about" item)

Excellent open-source mod: https://github.com/pahimar/Equivalent-Exchange-3

Excellent open-source mod: https://github.com/pahimar/Equivalent-Exchange-3

Thanks I am gonna check that out. But that seems to be using a library (CoFHLib) that is outdated, any help?

EE3 is for 1.7.10 still, I'm not sure if there are any 1.8 tutorials for GUIs yet but they're pretty similar to 1.7.10 I think

Yeah, I am not aware of anything much changing for 1.8 with respect to GUIs, or even items (except for the JSON model stuff).

 

What are you trying to do -- just open a GUI when an item is used by the player?

I'm using the code from EE3 in 1.8 and it's working perfectly. I think nothing has changed from 1.7 to 1.8.

 

This tutorial from coolAlias is also very helpful: http://www.minecraftforum.net/forums/mapping-and-modding/mapping-and-modding-tutorials/1571597-forge-1-6-4-1-8-custom-inventories-in-items-and