Hi, i have a registered tile entity and stuff, everything works fine except for when i reload my world the items inside the arent there. I added system.out.println() codes and the writeToNBT gets called but not readFromNBT!

 

Is it just me being stupid? Thanks in advance!

 

nbt code (It wont let me add a spoiler for some reason -.-):

 

@Override

public void writeToNBT(NBTTagCompound compound) {

super.writeToNBT(compound);

 

NBTTagList items = new NBTTagList();

 

for(int i=0;i<getSizeInventory();i++) {

ItemStack stack = getStackInSlot(i);

if(stack != null) {

NBTTagCompound item = new NBTTagCompound();

item.setByte("Slot", (byte)i);

stack.writeToNBT(compound);

items.appendTag(item);

System.out.println("Storing Stack "+i);

}

}

 

compound.setTag("Items", items);

}

 

@Override

public void readFromNBT(NBTTagCompound compound) {

super.readFromNBT(compound);

 

NBTTagList items = compound.getTagList("Items", compound.getId());

 

for (int i = 0; i < items.tagCount(); ++i) {

NBTTagCompound item = items.getCompoundTagAt(i);

byte slot = item.getByte("Slot");

if (slot >= 0 && slot < getSizeInventory()) {

setInventorySlotContents(slot, ItemStack.loadItemStackFromNBT(item));

System.out.println("Storing Stack "+i);

}

}

}

Did you ever call the readFromNBT method?

I didn't call the write method and that still works. I use the markDirty() method though.

Try overriding the getDescriptionPacket() method:

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

NBT works fine, just add in different print checks to see which parts are being called. Most likely one of your if statements is returning false and you don't realize it.

Did you ever call the readFromNBT method?

 

You (the programmer) don't have to.  That's the point of overriding existing functions: they're called by Minecraft's internals automagically.

@coolAlias:

 

Thanks, do i just copy that? I'm not very good with packet handlers!

@coolAlias:

 

Thanks, do i just copy that? I'm not very good with packet handlers!

 

That function, yes, and another.

 

public void onDataPacket(INetworkManager net, S35PacketUpdateTileEntity packet) {
    readFromNBT(packet.data);
}

 

(alert: this code was for 1.6.4, I just updating the packet class type, there MAY be other differences for 1.7)

They're both called automatically.

I copied it in and changed it for 1.7.2 (after a few minutes of google searching) but it still doesnt work!!

 

If you need more code im happy to show it.

Yes, just copy and paste this into your TileEntity:

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

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

 

If that's not working for you, did you update your IInventory code to use markDirty() now that onInventoryChanged() has been removed from that interface? You need to use it to ensure the inventory changes are recorded, as far as I can tell.

It still doesn't work! Maybe im being stupid somewhere else in my tile entity:

 

package com.ljcoding.robotmod.robotworkshop;

import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.inventory.IInventory;
import net.minecraft.item.ItemStack;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.nbt.NBTTagList;
import net.minecraft.network.NetworkManager;
import net.minecraft.network.Packet;
import net.minecraft.network.play.server.S35PacketUpdateTileEntity;
import net.minecraft.tileentity.TileEntity;

public class TileEntityWorkshop extends TileEntity implements IInventory {

private ItemStack[] items;

public TileEntityWorkshop() {
	items = new ItemStack[12];
}

@Override
public void closeInventory() {}

@Override
public void openInventory() {}

@Override
public ItemStack decrStackSize(int i, int count) {
	ItemStack itemstack = getStackInSlot(i);

	if(itemstack != null) {
		if(itemstack.stackSize <= count) {
			setInventorySlotContents(i, null);
		} else {
			itemstack = itemstack.splitStack(count);
			markDirty();
		}
	}

	return itemstack;
}

@Override
public String getInventoryName() {
	return "RobotWorkshop";
}

@Override
public int getInventoryStackLimit() {
	return 64;
}

@Override
public int getSizeInventory() {
	return items.length;
}

@Override
public ItemStack getStackInSlot(int i) {
	return items[i];
}

@Override
public ItemStack getStackInSlotOnClosing(int i) {
	ItemStack item = getStackInSlot(i);
	setInventorySlotContents(i, null);
	return item;
}

@Override
public boolean hasCustomInventoryName() {
	return true;
}

@Override
public boolean isItemValidForSlot(int i, ItemStack itemstack) {
	return false;
}

@Override
public boolean isUseableByPlayer(EntityPlayer player) {
	return player.getDistanceSq(xCoord + 0.5, yCoord + 0.5, zCoord + 0.5) <= 64;
}

@Override
public void setInventorySlotContents(int i, ItemStack itemstack) {
	items[i] = itemstack;

	if(itemstack != null && itemstack.stackSize > getInventoryStackLimit()) {
		itemstack.stackSize = getInventoryStackLimit();
	}

	markDirty();
}

@Override
public void writeToNBT(NBTTagCompound compound) {
	super.writeToNBT(compound);

	NBTTagList items = new NBTTagList();

	for(int i=0;i<getSizeInventory();i++) {
		ItemStack stack = getStackInSlot(i);
		if(stack != null) {
			NBTTagCompound item = new NBTTagCompound();
			item.setByte("Slot", (byte)i);
			stack.writeToNBT(compound);
			items.appendTag(item);
			System.out.println("Storing Stack "+i);
		}
	}

	compound.setTag("Items", items);
}

@Override
public void readFromNBT(NBTTagCompound compound) {
	super.readFromNBT(compound);

	NBTTagList items = compound.getTagList("Items", compound.getId());

	for (int i = 0; i < items.tagCount(); ++i) {
		NBTTagCompound item = items.getCompoundTagAt(i);
		byte slot = item.getByte("Slot");
		if (slot >= 0 && slot < getSizeInventory()) {
			setInventorySlotContents(slot, ItemStack.loadItemStackFromNBT(item));
			System.out.println("Storing Stack "+i);
		}
	}
}

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

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

Show us your main class and your onBlockActivated in your block too.

Main Class:

 

package com.ljcoding.robotmod;

import net.minecraft.block.Block;
import net.minecraft.block.material.Material;
import net.minecraft.creativetab.CreativeTabs;
import net.minecraft.init.Items;
import net.minecraft.item.Item;

import com.ljcoding.robotmod.robotworkshop.BlockWorkshop;
import com.ljcoding.robotmod.robotworkshop.GuiHandler;
import com.ljcoding.robotmod.robotworkshop.TileEntityWorkshop;

import cpw.mods.fml.common.Mod;
import cpw.mods.fml.common.Mod.EventHandler;
import cpw.mods.fml.common.Mod.Instance;
import cpw.mods.fml.common.event.FMLInitializationEvent;
import cpw.mods.fml.common.event.FMLPreInitializationEvent;
import cpw.mods.fml.common.registry.GameRegistry;

@Mod(modid = RobotMod.MODID, version = RobotMod.VERSION)
public class RobotMod {

    public static final String MODID = "RobotMod";
    public static final String VERSION = "0.0.1";
    
    @Instance(value = MODID)
    public static RobotMod instance;
    
    //Creative Tabs
    public static CreativeTabs robotTab = new CreativeTabs("robotTab") {
	@Override
	public Item getTabIconItem() {
		return Items.paper;
	}
    };
    
    //Blocks
    public static final Block workshop = new BlockWorkshop(1000, Material.iron);
    
    @EventHandler
    public void preInit(FMLPreInitializationEvent event) {
	GameRegistry.registerBlock(workshop, "Robot Workshop");
    }
    
    @EventHandler
    public void init(FMLInitializationEvent event) {
        new GuiHandler();
    	GameRegistry.registerTileEntity(TileEntityWorkshop.class, "tileentityworkshop");
    }
}

 

Block Class:

 

package com.ljcoding.robotmod.robotworkshop;

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;

import com.ljcoding.robotmod.RobotMod;

import cpw.mods.fml.common.network.internal.FMLNetworkHandler;
import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;

public class BlockWorkshop extends BlockContainer {

private IIcon icon;

public BlockWorkshop(int i, Material mat) {
	super(mat);
	this.setCreativeTab(RobotMod.robotTab);
	this.setStepSound(soundTypeMetal);
	this.setHardness(8f);
	this.setResistance(10f);
	this.setLightLevel(0.2f);
	this.setBlockName("Robot Workshop");
}

@Override
public boolean onBlockActivated(World world, int x, int y, int z, EntityPlayer player, int side, float hitX, float hitY, float hitZ) {
	if(!world.isRemote) {
		FMLNetworkHandler.openGui(player, RobotMod.instance, 0, world, x, y, z);
	}
	return false;
}

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

 @Override
 @SideOnly(Side.CLIENT)
 public void registerBlockIcons(IIconRegister iconRegister) {
	 icon = iconRegister.registerIcon("robot:block_workshop");
 }

 @SideOnly(Side.CLIENT)
 @Override
 public IIcon getIcon(int i, int j) {
	 return icon;
 }
}

Ok, so i changed some stuff around and the readFromNBT is only called when there isnt anything in the inventory! Anyone know why?

The problem is that you are writing the ItemStack to compound, but adding item to the tag list. When you are reading from nbt, you are reading the contents of the tag list, which doesn't contain any of the ItemStacks. Changing

stack.writeToNBT(compound);

into

stack.writeToNBT(item);

in writeToNBT should fix this problem.