I'm trying to store some data in an item before I give it to the player (Position and an integer)

ItemStack scepter = new ItemStack(ModItems.scepterGuard);
        if (!scepter.hasTagCompound())
        {
            scepter.setTagCompound(new NBTTagCompound());
        }
        NBTTagCompound compound = scepter.getTagCompound();

        compound.setInteger("task", task.ordinal());
        BlockPosUtil.writeToNBT(compound, "pos", building.getID());

        ItemStack item = player.inventory.getStackInSlot(player.inventory.currentItem);
        player.inventory.setInventorySlotContents(emptySlot, item);
        player.inventory.setInventorySlotContents(player.inventory.currentItem, scepter);

 

 

 

 

and trying to retrieve it afterwards in the item onUse:

 

ItemStack scepter = new ItemStack(ModItems.scepterGuard);
        if (!scepter.hasTagCompound())
        {
            scepter.setTagCompound(new NBTTagCompound());
        }
        NBTTagCompound compound = scepter.getTagCompound();

        int task = compound.getInteger("task");
        BlockPos guardTower = BlockPosUtil.readFromNBT(compound, "pos");

 

 

But that doesn't work...

In your

onItemUse

, you create a new

ItemStack

. A new

ItemStack

is never going to have the NBT data of another

ItemStack

. Either use the

ItemStack

parameter (1.8-1.10.2) or get the one from the player (1.11), as that's actually the one the player has in it's inventory.

Oh my god. Didn't even notice I was creating a new stack, thanks =D