Using NBT With Blocks

qpwoeiruty · October 26, 2014

I have used NBT before for entities but I don't know whether it is different for blocks. I have read something about tileEntities, but I don't know if they are relevant. If someone could explain the basics of what I need to do because the only tutorials I can find are outdated.

larsgerrits · October 26, 2014

If you want to store data about blocks in Minecraft, you can

a) use metadata

b) use a TileEntity

Now you say you want to use NBT to store data, so you have to use a TileEntity. If you only want to store data, you need to override

canUpdate()

to return false, so it doesn't tick constantly. In a TileEntity, there are methods called

readFromNBT(NBTTagCompound)

and

writeToNBT(NBTTagCompound)

. In those methods, you can save any data to the NBTTagCompound passed in.

qpwoeiruty · October 26, 2014

Okay, thanks. I am currently using metadata to change the texture of my block and am already using the updateTick() method to do so, along with some other code to check the blocks around. Would I need to move that code into my tile entity and do everything in that class rather than the actual block class?

larsgerrits · October 26, 2014

It depends on what you want to do. What do you want to store in the TileEntity?

qpwoeiruty · October 26, 2014

I will be storing 7 different integers that I calculate by checking what blocks are within a 5x5x5 area sort of thing.

larsgerrits · October 26, 2014

Then you would need a TileEntity. If you already have stuff stored using metadata, it's up to you if you want to convert it to the TileEntity.

qpwoeiruty · October 26, 2014

Thanks, I will get to it then.

qpwoeiruty · October 27, 2014

I set everything up now with my 7 integers in the tile entity class. I am now wondering how I access them in my actual block class.

larsgerrits · October 27, 2014

Almost every method in the Block class has the world,x,y,z coordinates of the block, and use

World#getTileEntity(x,y,z)

to get the TileEntity on that location. You can cast that to your TileEntity.

qpwoeiruty · October 27, 2014

Okay thanks, I think I know how to do that.

qpwoeiruty · October 27, 2014

I am having a bit of a problem with a null pointer exception. Whenever I try to System.out.println(tile.getCoal()); which I thought should work I just get a null pointer at that line. I don't really know why though, any help would be much appreciated, thanks.

Tile Entity

package com.phytomining.tileentities;

import java.util.Random;

import net.minecraft.block.Block;
import net.minecraft.nbt.NBTTagCompound;
import net.minecraft.network.Packet;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.world.World;

public class TilePlant extends TileEntity {

private Random random = new Random();

public int coal = 0;
public int iron = 0;
public int gold = 0;
public int redstone = 0;
public int lapis = 0;
public int diamond = 0;
public int emerald = 0;

public World world;
public int x;
public int y;
public int z;

@Override
public void updateEntity() {

	world = worldObj;
	x = xCoord;
	y = yCoord;
	z = zCoord;

	int meta = world.getBlockMetadata(x, y, z);

	int[][][] blocks = new int[5][5][5];

	if(random.nextInt(100) == 0) {

		for(int xx = 0; xx < 5; xx++) {

			for(int yy = 0; yy < 5; yy++) {

				for(int zz = 0; zz < 5; zz++) {

					Block b = world.getBlock((x - 2) + xx, y - (yy + 1), (z - 2) + zz);
					int block = b.getIdFromBlock(b);

					blocks[xx][yy][zz] = block;
					//System.out.println(xx + ", " + yy + ", " + zz + ": " + blocks[xx][yy][zz]);

					if(block == 16) coal++; 
					if(block == 15) iron++; 
					if(block == 14) gold++; 
					if(block == 73 || block == 74) redstone++; 
					if(block == 21) lapis++; 
					if(block == 56) diamond++; 
					if(block == 129) emerald++; 

					world.markBlockForUpdate(x, y, z);

				}

			}

		}

	}

}

@Override
public void writeToNBT(NBTTagCompound tag) {

	super.writeToNBT(tag);
	tag.setInteger("coal", this.coal);
	tag.setInteger("iron", this.iron);
	tag.setInteger("gold", this.gold);
	tag.setInteger("redstone", this.redstone);
	tag.setInteger("lapis", this.lapis);
	tag.setInteger("diamond", this.diamond);
	tag.setInteger("coal", this.coal);

}

@Override
public void readFromNBT(NBTTagCompound tag) {

	super.readFromNBT(tag);
	this.coal = tag.getInteger("coal");
	this.iron = tag.getInteger("iron");
	this.gold = tag.getInteger("gold");
	this.redstone = tag.getInteger("redstone");
	this.lapis = tag.getInteger("lapis");
	this.diamond = tag.getInteger("diamond");
	this.emerald = tag.getInteger("emerald");

}

public int getCoal() {

	return coal;

}

}

Block

package com.phytomining.blocks;

import java.util.Random;

import net.minecraft.block.Block;
import net.minecraft.block.BlockBush;
import net.minecraft.block.ITileEntityProvider;
import net.minecraft.block.material.Material;
import net.minecraft.client.renderer.texture.IIconRegister;
import net.minecraft.entity.item.EntityItem;
import net.minecraft.init.Items;
import net.minecraft.item.ItemStack;
import net.minecraft.tileentity.TileEntity;
import net.minecraft.util.IIcon;
import net.minecraft.world.World;

import com.phytomining.main.Phytomining;
import com.phytomining.tileentities.TilePlant;

import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;

public class BlockPlant extends BlockBush implements ITileEntityProvider {

private Random random = new Random();

private TilePlant tile;

private IIcon texture0;
private IIcon texture1;
private IIcon texture2;
private IIcon texture3;
private IIcon texture4;
private IIcon texture5;
private IIcon texture6;
private IIcon texture7;

public BlockPlant() {

	super(Material.plants);

	setCreativeTab(Phytomining.tabPhytomining);
	setBlockBounds(0.0F, 0.0F, 0.0F, 1.0F, 1.0F, 1.0F);
	setTickRandomly(true);
	setBlockTextureName(Phytomining.MODID + ":texture0");
	setBlockName("Jerry");

}

@Override
public void updateTick(World world, int x, int y, int z, Random r) {

	super.updateTick(world, x, y, z, r);

	world.scheduleBlockUpdate(x, y, z, this, 50);

}

@Override
public void onBlockDestroyedByPlayer(World world, int x, int y, int z, int metadata) {

	tile = (TilePlant)world.getTileEntity(x, y, z);
	System.out.println(tile.getCoal());
	if(!world.isRemote) {

		world.spawnEntityInWorld(new EntityItem(world, x + (random.nextInt(2)), y, z + (random.nextInt(2)), new ItemStack(Items.coal, tile.getCoal())));

	}
    
}

@Override
public TileEntity createNewTileEntity(World world, int i) {

 	return new TilePlant(); 

    }

@Override
public void onBlockAdded(World world, int x, int y, int z) {

	world.scheduleBlockUpdate(x, y, z, this, 50);

}



@SideOnly(Side.CLIENT)
public void registerBlockIcons(IIconRegister i) {

	texture0 = i.registerIcon(Phytomining.MODID + ":texture0");
	texture1 = i.registerIcon(Phytomining.MODID + ":texture1");
	texture2 = i.registerIcon(Phytomining.MODID + ":texture2");
	texture3 = i.registerIcon(Phytomining.MODID + ":texture3");
	texture4 = i.registerIcon(Phytomining.MODID + ":texture4");
	texture5 = i.registerIcon(Phytomining.MODID + ":texture5");
	texture6 = i.registerIcon(Phytomining.MODID + ":texture6");
	texture7 = i.registerIcon(Phytomining.MODID + ":texture7");

}

@SideOnly(Side.CLIENT)
public IIcon getIcon(int par1, int par2) {

	if(par2 == 0) return texture0;
	if(par2 == 1) return texture1;
	if(par2 == 2) return texture2;
	if(par2 == 3) return texture3;
	if(par2 == 4) return texture4;
	if(par2 == 5) return texture5;
	if(par2 == 6) return texture6;
	if(par2 == 7) return texture7;

	return texture0;

}

}

knokko · October 27, 2014

tile is probably null because that methods causes a nullpointerexception.

But I don't know how that is possible because the method you get your tileentity seems to be good.

Try System.out.println(tile);

Maybe this will help to understand the problem.

qpwoeiruty · October 27, 2014

I will try that and let you know.

This is for two of my custom blocks placed near each other...

[18:57:33] [server thread/INFO] [sTDOUT]: [com.phytomining.blocks.BlockPlant:updateTick:54]: com.phytomining.tileentities.TilePlant@303c8bb2

[18:57:41] [server thread/INFO] [sTDOUT]: [com.phytomining.blocks.BlockPlant:updateTick:54]: com.phytomining.tileentities.TilePlant@7b26e0b4

larsgerrits · October 27, 2014

Try making the tile variable in the mathod itself, instead of making a fieldin the Block class.

qpwoeiruty · October 28, 2014

I did that but sadly, it had no effect.

qpwoeiruty · October 28, 2014

Here is the entire crash report:

[11:39:27] [main/INFO] [GradleStart]: No arguments specified, assuming client.

[11:39:27] [main/INFO] [GradleStart]: Extra: []

[11:39:27] [main/INFO] [GradleStart]: Running with arguments: [--userProperties, {}, --tweakClass, cpw.mods.fml.common.launcher.FMLTweaker, --accessToken, {REDACTED}, --assetIndex, 1.7.10, --assetsDir, C:/Users/Will's/.gradle/caches/minecraft/assets, --version, 1.7.10]

[11:39:27] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLTweaker

[11:39:27] [main/INFO] [LaunchWrapper]: Using primary tweak class name cpw.mods.fml.common.launcher.FMLTweaker

[11:39:27] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLTweaker

[11:39:27] [main/INFO] [FML]: Forge Mod Loader version 7.10.85.1232 for Minecraft 1.7.10 loading

[11:39:27] [main/INFO] [FML]: Java is Java HotSpot 64-Bit Server VM, version 1.7.0_67, running on Windows 7:amd64:6.1, installed at C:\Program Files\Java\jdk1.7.0_67\jre

[11:39:27] [main/INFO] [FML]: Managed to load a deobfuscated Minecraft name- we are in a deobfuscated environment. Skipping runtime deobfuscation

[11:39:27] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

[11:39:27] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.FMLDeobfTweaker

[11:39:27] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLInjectionAndSortingTweaker

[11:39:27] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper

[11:39:28] [main/ERROR] [FML]: The binary patch set is missing. Either you are in a development environment, or things are not going to work!

[11:39:29] [main/ERROR] [FML]: FML appears to be missing any signature data. This is not a good thing

[11:39:29] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.relauncher.CoreModManager$FMLPluginWrapper

[11:39:29] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.FMLDeobfTweaker

[11:39:29] [main/INFO] [LaunchWrapper]: Loading tweak class name cpw.mods.fml.common.launcher.TerminalTweaker

[11:39:29] [main/INFO] [LaunchWrapper]: Calling tweak class cpw.mods.fml.common.launcher.TerminalTweaker

[11:39:29] [main/INFO] [LaunchWrapper]: Launching wrapped minecraft {net.minecraft.client.main.Main}

[11:39:30] [main/INFO]: Setting user: Player391

[11:39:31] [Client thread/INFO]: LWJGL Version: 2.9.1

[11:39:32] [Client thread/INFO] [MinecraftForge]: Attempting early MinecraftForge initialization

[11:39:32] [Client thread/INFO] [FML]: MinecraftForge v10.13.2.1232 Initialized

[11:39:32] [Client thread/INFO] [FML]: Replaced 182 ore recipies

[11:39:32] [Client thread/INFO] [MinecraftForge]: Completed early MinecraftForge initialization

[11:39:32] [Client thread/INFO] [FML]: Searching C:\Users\Will's\Desktop\Phytomining Mod\eclipse\mods for mods

[11:39:34] [Client thread/INFO] [FML]: Forge Mod Loader has identified 4 mods to load

[11:39:35] [Client thread/INFO] [FML]: Attempting connection with missing mods [mcp, FML, Forge, phytomining] at CLIENT

[11:39:35] [Client thread/INFO] [FML]: Attempting connection with missing mods [mcp, FML, Forge, phytomining] at SERVER

[11:39:35] [Client thread/INFO]: Reloading ResourceManager: Default, FMLFileResourcePack:Forge Mod Loader, FMLFileResourcePack:Minecraft Forge, FMLFileResourcePack:Phytomining

[11:39:35] [Client thread/INFO] [FML]: Processing ObjectHolder annotations

[11:39:35] [Client thread/INFO] [FML]: Found 341 ObjectHolder annotations

[11:39:35] [Client thread/INFO] [FML]: Configured a dormant chunk cache size of 0

[11:39:35] [Client thread/INFO] [FML]: Applying holder lookups

[11:39:35] [Client thread/INFO] [FML]: Holder lookups applied

[11:39:35] [sound Library Loader/INFO] [sTDOUT]: [paulscode.sound.SoundSystemLogger:message:69]:

[11:39:35] [sound Library Loader/INFO] [sTDOUT]: [paulscode.sound.SoundSystemLogger:message:69]: Starting up SoundSystem...

[11:39:35] [Thread-6/INFO] [sTDOUT]: [paulscode.sound.SoundSystemLogger:message:69]: Initializing LWJGL OpenAL

[11:39:35] [Thread-6/INFO] [sTDOUT]: [paulscode.sound.SoundSystemLogger:message:69]: (The LWJGL binding of OpenAL. For more information, see http://www.lwjgl.org)

[11:39:35] [Thread-6/INFO] [sTDOUT]: [paulscode.sound.SoundSystemLogger:message:69]: OpenAL initialized.

[11:39:36] [sound Library Loader/INFO] [sTDOUT]: [paulscode.sound.SoundSystemLogger:message:69]:

[11:39:36] [sound Library Loader/INFO]: Sound engine started

[11:39:36] [Client thread/ERROR]: Using missing texture, unable to load phytomining:textures/blocks/texture1.png

java.io.FileNotFoundException: phytomining:textures/blocks/texture1.png

at net.minecraft.client.resources.FallbackResourceManager.getResource(FallbackResourceManager.java:65) ~[FallbackResourceManager.class:?]

at net.minecraft.client.resources.SimpleReloadableResourceManager.getResource(SimpleReloadableResourceManager.java:67) ~[simpleReloadableResourceManager.class:?]

at net.minecraft.client.renderer.texture.TextureMap.loadTextureAtlas(TextureMap.java:126) [TextureMap.class:?]

at net.minecraft.client.renderer.texture.TextureMap.loadTexture(TextureMap.java:91) [TextureMap.class:?]

at net.minecraft.client.renderer.texture.TextureManager.loadTexture(TextureManager.java:89) [TextureManager.class:?]

at net.minecraft.client.renderer.texture.TextureManager.loadTickableTexture(TextureManager.java:71) [TextureManager.class:?]

at net.minecraft.client.renderer.texture.TextureManager.loadTextureMap(TextureManager.java:58) [TextureManager.class:?]

at net.minecraft.client.Minecraft.startGame(Minecraft.java:582) [Minecraft.class:?]

at net.minecraft.client.Minecraft.run(Minecraft.java:931) [Minecraft.class:?]

at net.minecraft.client.main.Main.main(Main.java:164) [Main.class:?]

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_67]

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_67]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_67]

at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_67]

at net.minecraft.launchwrapper.Launch.launch(Launch.java:135) [launchwrapper-1.11.jar:?]

at net.minecraft.launchwrapper.Launch.main(Launch.java:28) [launchwrapper-1.11.jar:?]

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.7.0_67]

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) ~[?:1.7.0_67]

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.7.0_67]

at java.lang.reflect.Method.invoke(Method.java:606) ~[?:1.7.0_67]

at GradleStart.bounce(GradleStart.java:107) [start/:?]

at GradleStart.startClient(GradleStart.java:100) [start/:?]

at GradleStart.main(GradleStart.java:55) [start/:?]

[11:39:37] [Client thread/INFO]: Created: 512x256 textures/blocks-atlas

[11:39:37] [Client thread/ERROR]: Using missing texture, unable to load minecraft:textures/items/texture.png.png

java.io.FileNotFoundException: minecraft:textures/items/texture.png.png