Hello together,

I want to save custom data in JSON format in the world's data folder.

How can I retrieve the path to it?

 

Thanks for your help!

Ok thank you.

Would I still be able to get the data in a screen container class?

Ok I will figure it out when my attempt now is not working.

Right now I am trying to send a CompoundNBT from the server to client.

My class looks like that:

Spoiler

public class SCPacketSendServerData {
    private final Server server;

    public SCPacketSendServerData(PacketBuffer buf){
        System.out.println("1");
        System.out.println(buf.readCompoundTag().getCompound("db")); //Null for some reason
      	System.out.println(buf.readString()); // TEST is printed
    }

    public SCPacketSendServerData(Server server){
        this.server = server;
    }

    public void toBytes(PacketBuffer buf){
        System.out.println("2");
        buf.writeCompoundTag(server.getData().getCompound("db")); //Normal object with all its contents
      	buf.writeString("TEST")
    }
}

 

As you can see I am writing my compound tag in toBytes. The tag is not null - I can get all the contents of the Server class.

But in my constructor the compount tag is null.

If I use a string instead it works fine. Can you find my mistake?

Ok, I changed my class to:

 

Spoiler

package de.j3ramy.economy.network;

import de.j3ramy.economy.screen.ServerScreen;
import de.j3ramy.economy.utils.Server;
import net.minecraft.client.Minecraft;
import net.minecraft.client.gui.screen.Screen;
import net.minecraft.network.PacketBuffer;
import net.minecraftforge.fml.network.NetworkEvent;

import java.util.function.Supplier;

public class SCPacketSendServerData {
    private final Server server;

    public SCPacketSendServerData(PacketBuffer buf){
        System.out.println("1");
        System.out.println(buf.readCompoundTag()); //null
    }

    public SCPacketSendServerData(Server server){
        this.server = server;
    }

    public void toBytes(PacketBuffer buf){
        System.out.println("2");
        System.out.println(server.getData().getCompound("db")); //all good
        buf.writeCompoundTag(server.getData().getCompound("db"));
        System.out.println(buf.readCompoundTag()); // ERROR: Caused by: java.io.IOException: Root tag must be a named compound tag
    }

    public void handle(Supplier<NetworkEvent.Context> ctx){
        ctx.get().enqueueWork(() ->{
            System.out.println("3");
        });
        ctx.get().setPacketHandled(true);
    }
}

 

As you can see this error gets created when I try to print it after I saved it. And I don't really know what this error means, because the tag has a name ("db")

Ah okay this was actually just for debug purpose. But good to know.

So, in there data not set yet, because it gets set there. Am I right?

 

But I don't get it why it's still null in the constructor

EDIT: It works now for some reason.

 

Another question: Is there a limit in how many content an nbt tag can save? E. g. can I add thousands of strings? Or is the limit actually the space on the hard disk?

Edited July 10, 20223 yr by J3ramy

There are some "hidden" limits which you might hit.

e.g. StringTag.write() uses DataOutput.writeUTF() which has this in its javadoc

Quote

First,
     * the total number of bytes needed to represent
     * all the characters of {@code s} is
     * calculated. If this number is larger than
     * {@code 65535}, then a {@code UTFDataFormatException}
     * is thrown.

Perfect.

Thank you @diesieben07 and @warjort!