TileEntity inventory without using IInventory?

memcallen · November 3, 2014

I don't know if this is the correct way to store items in nbt but heres my code:

package com.example.gammacraft.TileEntity;

import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.network.NetworkManager;
import net.minecraft.network.Packet;
import net.minecraft.network.play.server.S35PacketUpdateTileEntity;
import net.minecraft.tileentity.TileEntity;

public class MultiToolModifierTileEntity extends TileEntity {

public ItemStack[] inv;

public MultiToolModifierTileEntity() {
	inv=new ItemStack[10];
}

public Packet getDescriptionPacket() {
        NBTTagCompound nbtTag = new NBTTagCompound();
        this.writeToNBT(nbtTag);
        return new S35PacketUpdateTileEntity(this.xCoord, this.yCoord, this.zCoord, 1, nbtTag);
}

public void onDataPacket(NetworkManager net, S35PacketUpdateTileEntity packet) {
        readFromNBT(packet.func_148857_g());
}

public void writeToNBT(NBTTagCompound nbt){

	for(int i =1;i==inv.length;){
		NBTTagCompound NBT = new NBTTagCompound();
		inv[i].writeToNBT(NBT);
		nbt.setTag("ItemStack"+i,NBT);
		nbt.setTag("ItemStackData"+i, inv[i].stackTagCompound);
	}


}

public void readFromNBT(NBTTagCompound nbt){

	for(int i =1;i==inv.length;){
		NBTTagCompound itemstack = nbt.getCompoundTag("ItemStack"+i);
		NBTTagCompound data = nbt.getCompoundTag("ItemStackData"+i);

		inv[i]=ItemStack.loadItemStackFromNBT(itemstack);
		inv[i].stackTagCompound=data;

	}

}

}

I currently have it take the item in my hand and it puts the item in the ItemStack[] "inv"- thats the part that works. I can't make it save to NBT, for whatever reason. If you were wondering why I'm not using IInventory, it's because I don't want this block to be able to be automated-its my version of a crafting table.

memcallen · November 4, 2014

I don't want it to be automatable at all. Also when I close the world and reopen it the ItemStack that I put in doesn't get written or read properly from nbt and doesn't reload into the slot I put it in.

memcallen · November 4, 2014

yes but I'm not using a gui, and I'm not making it automatable. I see no reason to add extra functions to my TileEntity class. Anyways, do you know why my ItemStack isn't saving?

Draco18s · November 4, 2014

Do you know how to loop? At all?

This line is wrong, very very wrong.

for(int i =1;i==inv.length;)

memcallen · November 4, 2014

I've never understood for loops and well yeah...it kinda sucks

Draco18s · November 4, 2014

for(a; b; c) { d }

is the same thing as

a;
while(b); {
  d;
  c;
}

Hint: where are you changing the value of i?

Edit:

Whoops. Made a mistake late last night.

memcallen · November 4, 2014

Oh, I though the i++ was optional0

memcallen · November 4, 2014

I know basic java, but I misunderstood for loops.

memcallen · November 5, 2014

whatever, I changed the code to this:

package com.example.gammacraft.TileEntity;

import net.minecraft.entity.item.EntityItem;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.network.NetworkManager;
import net.minecraft.network.Packet;
import net.minecraft.network.play.server.S35PacketUpdateTileEntity;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.world.World;

public class MultiToolModifierTileEntity extends TileEntity {

public ItemStack[] inv;

public MultiToolModifierTileEntity() {
	inv=new ItemStack[10];
}

public Packet getDescriptionPacket() {
        NBTTagCompound nbtTag = new NBTTagCompound();
        this.writeToNBT(nbtTag);
        return new S35PacketUpdateTileEntity(this.xCoord, this.yCoord, this.zCoord, 1, nbtTag);
}

public void onDataPacket(NetworkManager net, S35PacketUpdateTileEntity packet) {
        readFromNBT(packet.func_148857_g());
}

public void writeToNBT(NBTTagCompound nbt){

	for(int i =1;i==inv.length;i++){
		NBTTagCompound NBT = new NBTTagCompound();
		inv[i].writeToNBT(NBT);
		nbt.setTag("ItemStack"+i,NBT);
		nbt.setTag("ItemStackData"+i, inv[i].stackTagCompound);
	}


}

public void readFromNBT(NBTTagCompound nbt){

	for(int i =1;i==inv.length;i++){
		NBTTagCompound itemstack = nbt.getCompoundTag("ItemStack"+i);
		NBTTagCompound data = nbt.getCompoundTag("ItemStackData"+i);

		inv[i]=ItemStack.loadItemStackFromNBT(itemstack);
		inv[i].stackTagCompound=data;

	}

}

}

but it still doesn't save the stack.

Draco18s · November 5, 2014

Oh, I though the i++ was optional0

Optional in the sense that if you don't have it, the program can still function...for some definition of function. It is possible to write a for loop thus:

for(;{
    //code
}

But you kind of have to know WTF you're doing to use it that way. Also, the missing i++ is not your only problem.

memcallen · November 5, 2014

I'm tired and can't find any issues right now please point them out.

memcallen · November 5, 2014

ok I'm getting somewhere, I changed the for loops to for(int i = 0;i!=inv.length+1;i++){//do stuff}, and I added a try/catch around a line in the read func, but I'm getting an error with the function "func_150298_a" I googled it and I'm writing an nbt tag to itself, but I can't see where or how. btw there is no error showing me where the line is thats causing the error.

stacktrace:

java.lang.NullPointerException
at net.minecraft.nbt.NBTTagCompound.func_150298_a(NBTTagCompound.java:309)
at net.minecraft.nbt.NBTTagCompound.write(NBTTagCompound.java:23)
at net.minecraft.nbt.NBTTagList.write(NBTTagList.java:35)
at net.minecraft.nbt.NBTTagCompound.func_150298_a(NBTTagCompound.java:314)
at net.minecraft.nbt.NBTTagCompound.write(NBTTagCompound.java:23)
at net.minecraft.nbt.NBTTagCompound.func_150298_a(NBTTagCompound.java:314)
at net.minecraft.nbt.NBTTagCompound.write(NBTTagCompound.java:23)
at net.minecraft.nbt.CompressedStreamTools.func_150663_a(CompressedStreamTools.java:146)
at net.minecraft.nbt.CompressedStreamTools.write(CompressedStreamTools.java:136)
at net.minecraft.world.chunk.storage.AnvilChunkLoader.writeChunkNBTTags(AnvilChunkLoader.java:197)
at net.minecraft.world.chunk.storage.AnvilChunkLoader.writeNextIO(AnvilChunkLoader.java:183)
at net.minecraft.world.storage.ThreadedFileIOBase.processQueue(ThreadedFileIOBase.java:30)
at net.minecraft.world.storage.ThreadedFileIOBase.run(ThreadedFileIOBase.java:23)
at java.lang.Thread.run(Unknown Source)

This doesn't crash me but I have no idea how to fix it.

EDIT:

the error only gets thrown when I take the item out of my block.

yariplus · November 5, 2014

The number after the colon is the line number.

memcallen · November 5, 2014

...I know, those are all vanilla classes

yariplus · November 5, 2014

the error only gets thrown when I take the item out of my block.

Show us the block class.

memcallen · November 5, 2014

Good luck sorting through the onBlockActivated code...

package com.example.gammacraft.blocks.Machines;

import com.example.gammacraft.RandomFunctions;
import com.example.gammacraft.gammacraft;
import com.example.gammacraft.TileEntity.MultiToolModifierTileEntity;

import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;
import net.minecraft.block.BlockContainer;
import net.minecraft.block.material.Material;
import net.minecraft.client.renderer.texture.IIconRegister;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.IIcon;
import net.minecraft.world.World;

public class MultiToolModifier extends BlockContainer {

public MultiToolModifier() {
	super(Material.iron);
	this.setBlockBounds(0F, 0F, 0F, 1F, 0.25F, 1F);
	this.setBlockName("MultiToolModifier");
	this.setCreativeTab(gammacraft.gammacraftcreativetab);
}

float pixel = 1F/16F;

@Override
public boolean onBlockActivated(World world,int x,int y,int z,EntityPlayer player,int side,float hx,float hy,float hz){
	MultiToolModifierTileEntity te = (MultiToolModifierTileEntity)world.getTileEntity(x, y, z);

		if(side==1){
			//slot 1
			if(withinBounds(hx,pixel*2,pixel*4)&&withinBounds(hz,pixel*4,pixel*6)){
				if(!world.isRemote)
				System.out.println("Button 1 is pressed");

				if(te.inv[0]!=null){
					player.inventory.mainInventory[player.inventory.currentItem]=te.inv[0];
					te.inv[0]=null;
				}else{
					te.inv[0]=player.inventory.mainInventory[player.inventory.currentItem];
					player.inventory.mainInventory[player.inventory.currentItem]=null;
				}

				return true;
			}
			//slot 2
			if(withinBounds(hx,pixel*2,pixel*4)&&withinBounds(hz,pixel*7,pixel*9)){
				if(!world.isRemote)
					System.out.println("Button 2 is pressed");

				if(te.inv[1]!=null){
					player.inventory.mainInventory[player.inventory.currentItem]=te.inv[1];
					te.inv[1]=null;
				}else{
					te.inv[1]=player.inventory.mainInventory[player.inventory.currentItem];
					player.inventory.mainInventory[player.inventory.currentItem]=null;
				}


					return true;
			}
			//slot 3
			if(withinBounds(hx,pixel*2,pixel*4)&&withinBounds(hz,pixel*10,pixel*12)){
				if(!world.isRemote)
					System.out.println("Button 3 is pressed");

				if(te.inv[2]!=null){
					player.inventory.mainInventory[player.inventory.currentItem]=te.inv[2];
					te.inv[2]=null;
				}else{
					te.inv[2]=player.inventory.mainInventory[player.inventory.currentItem];
					player.inventory.mainInventory[player.inventory.currentItem]=null;
				}

					return true;
			}
			//slot 4
			if(withinBounds(hx,pixel*5,pixel*7)&&withinBounds(hz,pixel*4,pixel*6)){
				if(!world.isRemote)
					System.out.println("Button 4 is pressed");

				if(te.inv[3]!=null){
					player.inventory.mainInventory[player.inventory.currentItem]=te.inv[3];
					te.inv[3]=null;
				}else{
					te.inv[3]=player.inventory.mainInventory[player.inventory.currentItem];
					player.inventory.mainInventory[player.inventory.currentItem]=null;
				}

					return true;
			}
			//slot 5
			if(withinBounds(hx,pixel*5,pixel*7)&&withinBounds(hz,pixel*7,pixel*9)){
				if(!world.isRemote)
					System.out.println("Button 5 is pressed");

				if(te.inv[4]!=null){
					player.inventory.mainInventory[player.inventory.currentItem]=te.inv[4];
					te.inv[4]=null;
				}else{
					te.inv[4]=player.inventory.mainInventory[player.inventory.currentItem];
					player.inventory.mainInventory[player.inventory.currentItem]=null;
				}

					return true;
			}
			//slot 6
			if(withinBounds(hx,pixel*5,pixel*7)&&withinBounds(hz,pixel*10,pixel*12)){
				if(!world.isRemote)
					System.out.println("Button 6 is pressed");

				if(te.inv[5]!=null){
					player.inventory.mainInventory[player.inventory.currentItem]=te.inv[5];
					te.inv[5]=null;
				}else{
					te.inv[5]=player.inventory.mainInventory[player.inventory.currentItem];
					player.inventory.mainInventory[player.inventory.currentItem]=null;
				}

					return true;
			}
			//slot 7
			if(withinBounds(hx,pixel*8,pixel*10)&&withinBounds(hz,pixel*4,pixel*6)){
				if(!world.isRemote)
					System.out.println("Button 7 is pressed");

				if(te.inv[6]!=null){
					player.inventory.mainInventory[player.inventory.currentItem]=te.inv[6];
					te.inv[6]=null;
				}else{
					te.inv[6]=player.inventory.mainInventory[player.inventory.currentItem];
					player.inventory.mainInventory[player.inventory.currentItem]=null;
				}

					return true;
			}
			//slot 8
			if(withinBounds(hx,pixel*8,pixel*10)&&withinBounds(hz,pixel*7,pixel*9)){
				if(!world.isRemote)
					System.out.println("Button 8 is pressed");

				if(te.inv[7]!=null){
					player.inventory.mainInventory[player.inventory.currentItem]=te.inv[7];
					te.inv[7]=null;
				}else{
					te.inv[7]=player.inventory.mainInventory[player.inventory.currentItem];
					player.inventory.mainInventory[player.inventory.currentItem]=null;
				}

					return true;
			}
			//slot 9
			if(withinBounds(hx,pixel*8,pixel*10)&&withinBounds(hz,pixel*10,pixel*12)){
				if(!world.isRemote)
					System.out.println("Button 9 is pressed");

				if(te.inv[8]!=null){
					player.inventory.mainInventory[player.inventory.currentItem]=te.inv[8];
					te.inv[8]=null;
				}else{
					te.inv[8]=player.inventory.mainInventory[player.inventory.currentItem];
					player.inventory.mainInventory[player.inventory.currentItem]=null;
				}

					return true;
			}
			//slot 10 (output)
			if(withinBounds(hx,pixel*12,pixel*14)&&withinBounds(hz,pixel*7,pixel*9)){
				if(!world.isRemote)
					System.out.println("Button 10 is pressed");

				if(te.inv[9]!=null){
					player.inventory.mainInventory[player.inventory.currentItem]=te.inv[9];
					te.inv[9]=null;
				}

					return true;
			}
		}

	return false;
}




@Override
public TileEntity createNewTileEntity(World var1, int var2) {
	return new MultiToolModifierTileEntity();
}

@SideOnly(Side.CLIENT)
public static IIcon sideIcon;
@SideOnly(Side.CLIENT)
public static IIcon bottom;
@SideOnly(Side.CLIENT)
public static IIcon top;

public void registerBlockIcons(IIconRegister i){
	sideIcon = i.registerIcon("gammacraft:FireJetSide");
	top = i.registerIcon("gammacraft:MultiToolModifierTop");
}

public IIcon getIcon(int side, int meta){
	if(side==1)return top;
	else return sideIcon;
}


public boolean withinBounds(float x, float min,float max){
	return x>min&&x<max;
}
}

EDIT:

you're lucky I decided to make a youtube video on how it works in the world. Should make it easier to figure out how it works.

yariplus · November 5, 2014

Not sure if this is related to your error, but, when an item is used, you generally do not want to set the slot to null, you want to decrement the stackSize. The game will work out if the slot should be null or not.

memcallen · November 5, 2014

I don't see any reason why I should change it, considering thats pretty much all my code. anyways, this idea was just a work around for a gui (I can't figure out for the life of me how to make it render in the right spot).

Draco18s · November 5, 2014

...you're going to need to figure out for loops before you can even get to GL11 operations.

memcallen · November 5, 2014

I don't even care anymore, I figured out for loops. I figured out GUIs I haven't figured out where to render it. I know how to render it. I've used GL11 and the tessellators before. Honestly, this topic isn't about for loops its about ItemStacks not saving in nbt, so please either answer my first question or don't answer at all.

Draco18s · November 5, 2014

this topic isn't about for loops its about ItemStacks not saving in nbt

Your items aren't saving because your for loop is fucked up.

memcallen · November 5, 2014

Please give me an example because obviously I'm incompetent for making for loops.

yariplus · November 5, 2014

I see a few of problems,

You're storing the ItemStack's NBTTagCompound twice.

You never call markDirty()

You never do null checks.

You do a lot of stuff on both Sides, which can cause one Side to have the wrong information.

You are setting the player's held Item, without making sure it's empty first.

memcallen · November 5, 2014

Where am I setting the itemstack twice?

I have no idea what markdirty does

The rest will be added when I polish up the code, right now I just want something that works

yariplus · November 5, 2014

This is the Itemstack writeToNBT method:

    /**
     * Write the stack fields to a NBT object. Return the new NBT object.
     */
    public NBTTagCompound writeToNBT(NBTTagCompound p_77955_1_)
    {
        p_77955_1_.setShort("id", (short)Item.getIdFromItem(this.field_151002_e));
        p_77955_1_.setByte("Count", (byte)this.stackSize);
        p_77955_1_.setShort("Damage", (short)this.itemDamage);

        if (this.stackTagCompound != null)
        {
            p_77955_1_.setTag("tag", this.stackTagCompound);
        }

        return p_77955_1_;
    }

It checks and stores the stackTagCompound, which you store a second time in your writeToNBT:

			nbt.setTag("ItemStack"+i,NBT); // Stores the NBT.stackTagCompound Tag
		nbt.setTag("ItemStackData"+i, inv[i].stackTagCompound); // Duplicate Tag

markDirty() is a method on TileEntity. It ensures that the TileEntity is saved. Even if Minecraft would normally not save it, for example, when no blocks have changed.

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TileEntity inventory without using IInventory?

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