i'm trying to make a mod where i would like to use stuff from other mods like buildcrafts energy but there are some stuff that are stopping me from using apis

 

1. i don't now where to put/how to install an api (some come in an jar and other zip) i tryed to add it as an lib (i'm using intellij) but an'y the buildcraft api would work there

2. i have no clue and can't find any documentation on how to detect if the mod is install once out if the dev workspace

3. this is almost as number 2, i don't now how to detect items from other mods (if i want to use it in crafting)

You might want to try CoolAlias' tutorial on APIs: http://www.minecraftforum.net/forums/mapping-and-modding/mapping-and-modding-tutorials/1571434-tutorial-modding-with-apis

You might want to try CoolAlias' tutorial on APIs: http://www.minecraftforum.net/forums/mapping-and-modding/mapping-and-modding-tutorials/1571434-tutorial-modding-with-apis

i try'ed that and only one of the 3 apis i wan't to use worked

what i want to use is ae2, buildcraft, thaumcraft 4

the weird part is that for those apis that don't work (the way the tutorial says how to do) i can't see the classes but the folders are there http://puu.sh/atLSI/397da42ea8.PNG