[1.7.10] Trouble with stackTagCompound

HappyKiller1O1 · April 25, 2015

Ok so, my item when crafted sets it's stackTagCompound to a new NBTTagCompound. After that, I set a string. Then, in my event class I get the item in the players hand and, if it's the hammer I am creating; sets an itemstack to it and then gets it's stackTagCompound. What's my problem you may ask? Well, it's always null. I have pondered this for hours and have no clue what I am doing wrong. I have tried setting tags, resetting the stackTagCompound to a another NBTTagCompound, making sure my item is only stackable to 1 etc. I need help because I am about to rip my hair out. Here's the code as it is now.

Creation method in my item:

public void onCreated(ItemStack stack, World world, EntityPlayer player) {
	System.out.println("NBT TAG SET");

	stack.stackTagCompound = new NBTTagCompound();

	stack.stackTagCompound.setString("MiningSize", "3x3");
}

Event method to get it (this is using the BlockBreak event):

if(event.world != null && player != null) {
		if(player.inventory.getCurrentItem() != null) {
			if(player.inventory.getCurrentItem().getItem().equals(CrewMod.crewHammer)) {
				int direction = MathHelper.floor_double((double)(player.rotationYaw * 4.0F / 360.0F) + 0.5D) & 3;

				ItemStack hammer = player.inventory.getCurrentItem();

				//System.out.println("ITEM IN HAND IS CREW HAMMER");

				Block block = event.block;

				World world = event.world;

				int x = event.x;
				int y = event.y;
				int z = event.z;

				NBTTagCompound cmp = hammer.stackTagCompound;

April 26, 2015

I hope you're crafting it and not pulling it out of the creative menu. (I think that's how onCreated is called)

You could use the onUpdate method to check if stackTagCompound is null, if so set it to 3x3.

HappyKiller1O1 · April 26, 2015

I do craft it and it registers it in the console with my printout. It does seem to call the onCreated method four times (twice for server and twice for client) is that a problem?

Ernio · April 26, 2015

When you are operating on NBT - always do it on server-only. Do !world.isRemote.

And yes, it might be the problem you were looking for. When in creative-mode you (as player) are allowd to edit ItemStack's NBT (the server will accept your client-sided changes on ItemStack and override server's ones with them - your client is treated as "admin" entity).

Other than that - I have no idea what can be wrong. You could post more code, where else is your NBT used, maybe you are accidentaly reseting it?

HappyKiller1O1 · April 26, 2015

I only call it in my EventsForge class. Maybe I just need to set it on server side only.

HappyKiller1O1 · April 26, 2015

Ok so, it's still returning null. Is it somehow because I can't get the stackTagCompound from the item in the player's hand? I just don't know what's wrong.

Elix_x · April 26, 2015

Ok so, it's still returning null. Is it somehow because I can't get the stackTagCompound from the item in the player's hand? I just don't know what's wrong.

By default stackTagCompound in itemstack is null. So when you get it, if it is null you set it to new tag...

HappyKiller1O1 · April 26, 2015

I do do that (in my Event class) and then it returns the string I set as null.

Elix_x · April 26, 2015

Does your code look something like this? If not - try, it's working for me. And also, hint: do fixTags method somewhere, that will do all null checks and fix missing tags. And all it before operating nbt...

NBTTagCompound tag = itemstack.stackTagCompound;
if(tag == null){
itemstack.stackTagCompound = new NBTTagCompound();
tag = itemstack.stackTagCompound;
}
... do your stuff here...
itemstack.stackTagCompound = tag;

HappyKiller1O1 · April 26, 2015

I'll try that but, may I ask why you set the stackCompound to a new one and set the tag you made to it but then, after doing everything; set the stackCompound to the tag?

Elix_x · April 26, 2015

I'll try that but, may I ask why you set the stackCompound to a new one and set the tag you made to it but then, after doing everything; set the stackCompound to the tag?

I don't know. Sometimes without last line it is not working? Strange...

HappyKiller1O1 · April 26, 2015

So, I tried that and it still won't get the string. Here's what I did:

ItemStack hammer = new ItemStack(player.inventory.getCurrentItem().getItem());

				//System.out.println("ITEM IN HAND IS CREW HAMMER");

				Block block = event.block;

				World world = event.world;

				int x = event.x;
				int y = event.y;
				int z = event.z;

				NBTTagCompound cmp = hammer.stackTagCompound;

				if(cmp == null) {
					System.out.println("onBlockBreak HAMMER NBT WAS NULL");

					hammer.stackTagCompound = new NBTTagCompound();
					cmp = hammer.stackTagCompound;
				}

				//if(event.isCanceled())
					//return;

				String miningArea = null;

				if(cmp != null) {
					miningArea = cmp.getString("MiningSize");

					System.out.println("CMP WAS NOT NULL");
				}

				hammer.stackTagCompound = cmp;

				System.out.println(miningArea);

				this.breakBlock(world, player, hammer, x, y, z, direction, miningArea);

Elix_x · April 26, 2015

So, I tried that and it still won't get the string. Here's what I did:

ItemStack hammer = new ItemStack(player.inventory.getCurrentItem().getItem());

				//System.out.println("ITEM IN HAND IS CREW HAMMER");

				Block block = event.block;

				World world = event.world;

				int x = event.x;
				int y = event.y;
				int z = event.z;

				NBTTagCompound cmp = hammer.stackTagCompound;

				if(cmp == null) {
					System.out.println("onBlockBreak HAMMER NBT WAS NULL");

					hammer.stackTagCompound = new NBTTagCompound();
					cmp = hammer.stackTagCompound;
				}

				//if(event.isCanceled())
					//return;

				String miningArea = null;

				if(cmp != null) {
					miningArea = cmp.getString("MiningSize");

					System.out.println("CMP WAS NOT NULL");
				}

				hammer.stackTagCompound = cmp;

				System.out.println(miningArea);

				this.breakBlock(world, player, hammer, x, y, z, direction, miningArea);

Do you think that on new stack, your mining area string will magically exist??? Again, null check and new set, this time for string...

And also, what the heck is this???

ItemStack hammer = new ItemStack(player.inventory.getCurrentItem().getItem());

HappyKiller1O1 · April 26, 2015

Well see, the string is set from a gui so it would be quite difficult to set it in the event class and item class. And that was me testing if I got the itemstack incorrect so ignore that.

Elix_x · April 26, 2015

Well see, the string is set from a gui so it would be quite difficult to set it in the event class and item class. And that was me testing if I got the itemstack incorrect so ignore that.

Well, then check that you do same nbt check where you set the string. Then check all names of tags.

HappyKiller1O1 · April 26, 2015

Sorry if I am becoming annoying but, could you maybe elaborate on what you just said? NBT sometimes confuses me so, yeah.

Elix_x · April 26, 2015

Sorry if I am becoming annoying but, could you maybe elaborate on what you just said? NBT sometimes confuses me so, yeah.

Okay, so let's begin optifying nbt manipulations:

First create nbt helper method, that will "fix" missing tags. For you it will look something like:

public static void fixNBT(ItemStack hammer){
NBTTagCompound cmp = hammer.stackTagCompound;				
if(cmp == null) {						
hammer.stackTagCompound = new NBTTagCompound();
cmp = hammer.stackTagCompound;
}
if(!cmp.hasKey("MiningArea")){
cmp.setString("MiningArea", "DEFAULT");
}
hammer.stackTagCompound = cmp;
}

Than before each nbt manipulation (getting/setting included), just call this method...

ps: i wrote this code from memory, so it may not have exact method names...

HappyKiller1O1 · April 26, 2015

Thank you for this. Where would I create this though? Considering it is static, would it go in the Item class? And also, you tell the game if it doesn't contain the key "MiningArea" to set the string? I'm guessing that was a typo?

EDIT: Nevermind! Forgot hasKey is used for anything set to NBT. Sorry!

Elix_x · April 26, 2015

Thank you for this. Where would I create this though? Considering it is static, would it go in the Item class? And also, you tell the game if it doesn't contain the key "MiningArea" to set the string? I'm guessing that was a typo?

EDIT: Nevermind! Forgot hasKey is used for anything set to NBT. Sorry!

You can put it anywhere, it does not matter...

Is it working now???

HappyKiller1O1 · April 26, 2015

It does seem to work. I added a String variable so I can set the string to something I want. So, in a GUI class I could call the fix NBT to set it correctly? Or am I missing something?

Elix_x · April 26, 2015

It does seem to work. I added a String variable so I can set the string to something I want. So, in a GUI class I could call the fix NBT to set it correctly? Or am I missing something?

Yes. That's made for it...

HappyKiller1O1 · April 26, 2015

Now see, the stackTagCompound will be null in any class besides the Item class (as it is now). By calling this method it would fix the nbt but, I'd have to fix it again in the gui class which wouldn't update it for the event class. This is a problem considering the nbt needs to be set from the gui to be used in the event class for handling.

Elix_x · April 26, 2015

Now see, the stackTagCompound will be null in any class besides the Item class (as it is now). By calling this method it would fix the nbt but, I'd have to fix it again in the gui class which wouldn't update it for the event class. This is a problem considering the nbt needs to be set from the gui to be used in the event class for handling.

The interesting thing about this method is that if nbt is already defined, it will not replace values. That means that you can run it infinite amunt of times, without woriing of defaulting your info...

Is that what you mean? Or i misunderstood? Soryy, if yes...

HappyKiller1O1 · April 26, 2015

No that is what I mean but, it seems to always default my info. Like see here where it is called in my Item class and event class (I removed the String variable):

//In Item Class
public void onCreated(ItemStack stack, World world, EntityPlayer player) {
	if(world.isRemote)
		return;

	System.out.println("NBT TAG SET");

	NBTTagCompound cmp = stack.stackTagCompound;

	if(cmp == null) {
		cmp = new NBTTagCompound();
		stack.stackTagCompound = cmp;
	}

	this.fixNBT(stack);

	cmp.setString("MiningSize", "3x3");
}

//Event Class
public void onBlockBreak(BreakEvent event) {
	EntityPlayer player = event.getPlayer();

	if(event.world != null && player != null) {
		if(player.inventory.getCurrentItem() != null) {
			if(player.inventory.getCurrentItem().getItem().equals(CrewMod.crewHammer)) {
				int direction = MathHelper.floor_double((double)(player.rotationYaw * 4.0F / 360.0F) + 0.5D) & 3;

				ItemStack hammer = player.inventory.getCurrentItem();

				//System.out.println("ITEM IN HAND IS CREW HAMMER");

				Block block = event.block;

				World world = event.world;

				int x = event.x;
				int y = event.y;
				int z = event.z;

				CrewHammer.fixNBT(hammer);

				NBTTagCompound cmp = hammer.stackTagCompound;

				//if(event.isCanceled())
					//return;

				String miningArea = null;

				if(cmp != null) {
					miningArea = cmp.getString("MiningSize");

					//System.out.println("CMP WAS NOT NULL");
				}

				System.out.println(miningArea);

				this.breakBlock(world, player, hammer, x, y, z, direction, miningArea);
			}
		}
	}
}

When called in the event class, the information is defaulted because the stackTagCompound returns null although I set it in the onCreated (Yes I craft a new hammer every time I go to test it)

Elix_x · April 26, 2015

No that is what I mean but, it seems to always default my info. Like see here where it is called in my Item class and event class (I removed the String variable):

//In Item Class
public void onCreated(ItemStack stack, World world, EntityPlayer player) {
	if(world.isRemote)
		return;

	System.out.println("NBT TAG SET");

	NBTTagCompound cmp = stack.stackTagCompound;

	if(cmp == null) {
		cmp = new NBTTagCompound();
		stack.stackTagCompound = cmp;
	}

	this.fixNBT(stack);

	cmp.setString("MiningSize", "3x3");
}

//Event Class
public void onBlockBreak(BreakEvent event) {
	EntityPlayer player = event.getPlayer();

	if(event.world != null && player != null) {
		if(player.inventory.getCurrentItem() != null) {
			if(player.inventory.getCurrentItem().getItem().equals(CrewMod.crewHammer)) {
				int direction = MathHelper.floor_double((double)(player.rotationYaw * 4.0F / 360.0F) + 0.5D) & 3;

				ItemStack hammer = player.inventory.getCurrentItem();

				//System.out.println("ITEM IN HAND IS CREW HAMMER");

				Block block = event.block;

				World world = event.world;

				int x = event.x;
				int y = event.y;
				int z = event.z;

				CrewHammer.fixNBT(hammer);

				NBTTagCompound cmp = hammer.stackTagCompound;

				//if(event.isCanceled())
					//return;

				String miningArea = null;

				if(cmp != null) {
					miningArea = cmp.getString("MiningSize");

					//System.out.println("CMP WAS NOT NULL");
				}

				System.out.println(miningArea);

				this.breakBlock(world, player, hammer, x, y, z, direction, miningArea);
			}
		}
	}
}

When called in the event class, the information is defaulted because the stackTagCompound returns null although I set it in the onCreated (Yes I craft a new hammer every time I go to test it)

Are you sure that on created is succesfully called?

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[1.7.10] Trouble with stackTagCompound

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