I can't get the getStackInSlot function to work on a chest.

I even tried to copy the code of hoppers but it's still not working.

 

This is the code to get the inventory:

 

      public void updateEntity() {
        	TileEntity inpTile = worldObj.getBlockTileEntity(xCoord, yCoord, zCoord+1);
        	if ((inpTile != null) && (inpTile instanceof IInventory)){
        		IInventory inpInventory = (IInventory) inpTile;
        		
        		
                if (inpInventory instanceof TileEntityChest)
                {
                    int l = this.getWorldObj().getBlockId(xCoord, yCoord, zCoord+1);
                    Block block = Block.blocksList[l];

                    if (block instanceof BlockChest)
                    {
                    	inpInventory = ((BlockChest)block).getInventory(this.getWorldObj(), xCoord, yCoord, zCoord+1);
                    }
                }
        		
        		
        		
        		for (int i=0; i<inpInventory.getSizeInventory();i++){
        			if (inpInventory.getStackInSlot(i)!=null){
        				ItemStack incomingStack = inpInventory.getStackInSlot(i); //always returns null
        				//stub
        				}
        			}
        		}
        	}
        

 

The problem is, from what I can see from the debug, that inpInventory.getStackInSlot(i) always returns null.

inpInventory and inpTile aren't null and are instance of TileEntityChest, and inpInventory.getSizeInventory() correctly returns 27.

Could you tell me what's wrong?

For one, you are using different coordinates to retrieve the tile entity than you do when you retrieve the inventory if it's a chest. Where are you getting xCoord/yCoord/zCoord from, and where are you getting xChest/yChest/zChest coordinates from, and why are you using two different coordinate sets?

They would be both xCoord, yCoord, zCoord+1 , I changed that in the code I posted to make it more clear that those were the coordinates I'm getting the chest from, but I forgot to change them in the getInventory method.

Anyway, they're the same in my code, so that's not the problem.

Well then can you please post your real code, because it's impossible to tell what's going on as it is in your post. Why zCoord + 1? Where are these coordinates from? What method is this code being run in? The information you posted is not enough.

        public void updateEntity() {
        	TileEntity inpTile = worldObj.getBlockTileEntity(xCoord, yCoord, zCoord+1);
        	if ((inpTile != null) && (inpTile instanceof IInventory)){
        		IInventory inpInventory = (IInventory) inpTile;
        		
        		
                if (inpInventory instanceof TileEntityChest)
                {
                    int l = this.getWorldObj().getBlockId(xCoord, yCoord, zCoord+1);
                    Block block = Block.blocksList[l];

                    if (block instanceof BlockChest)
                    {
                    	inpInventory = ((BlockChest)block).getInventory(this.getWorldObj(), xCoord, yCoord, zCoord+1);
                    }
                }
        		
        		
        		
        		for (int i=0; i<inpInventory.getSizeInventory();i++){
        			if (inpInventory.getStackInSlot(i)!=null){
        				ItemStack incomingStack = inpInventory.getStackInSlot(i);
        				//stub
        				}
        			}
        		}
        	}
        

 

But I can't really see what you would need to know why zCoord+1, since it has absolutely nothing to do with my problem.

 

PS: before you ask, yes, there is a chest at (xCoord, yCoord, zCoord + 1), and the tileentity returned by getBlockTileEntity is not null, it's a TileEntityChest instance.

I didn't mean to be rude about it, but you've got a lot of wonky stuff going on in your code. For instance, when you get the TileEntityChest, it is already an IInventory, meaning you should have access right away; why are you doing all this other weird stuff getting the block and then getting the block's inventory, when you already have it?

 

If you're absolutely 100% sure that the IInventory you want is at zCoord+1, that's fine, but it seems off to me. This code is in a TileEntity already, right? But you don't want this TileEntity's inventory, you want a different one? Ok. Still:

TileEntity te = worldObj.getBlockTileEntity(xCoord, yCoord, zCoord + 1); // going along with you here
if (te instanceof IInventory) {
// now you've got an inventory
IInventory inv = (IInventory) te;
for (int i = 0; i < inv.getSizeInventory(); ++i) {
// etc.
}
}

Should be as simple as that. If it's not working, try putting println's all over the place, if you haven't already, to make sure it's getting called and that the variables are what you think they are.

My objective is to make a machine that gets a chest's inventory and puts it into its own inventory, that's why I'm calling to another inventory.

 

The code you wrote is identical to the code I had before looking at the TileEntityHopper class, and it's not working, so I looked how the hopper did that, and I saw it has special code for chests, so I copied the extra bit, but it's still not working.

I followed the code step by step for both my TE and the Hopper, and the only difference seems to be that, when I call getStackInSlot I get null, while the hopper gets the itemStack, as it should

I am going to ask the obvious but...

does the chest contain something ?

Simple or double chest ?

Simple chest, and it contains things

 

 

EDIT:

 

I don't know why, but initializing 

      IInventory inpInventory = null;

before assigning its vaule to (IInventory) inpTile fixes the problem...

 

thanks everyone anyway.