[SOLVED][1.19.2] How to use FriendlyByteBuf Reader and Writer

[Ezio214]

I have a custom packet (Server to Client) with following snippet:

public CustomS2CPacket(FriendlyByteBuf buf) {
	this.test = (HashMap) buf.readMap(null, null); // why does this want two FriendlyByteBuf.Reader and how to implement them?
}

public void toBytes(FriendlyByteBuf buf) {
	buf.writeMap(this.test, null, null); // why does this want two FriendlyByteBuf.Writer and how to implement them?
}

 comments and title says it all.

Edited November 26, 2022 by Ezio214

[warjort]

https://forge.gemwire.uk/wiki/Main_Page

Specifically, the "handling information" section.

[Ezio214]

So I need a buf.write or buf.read method, ok. 

 

But how do I read a String. I found readCharSequence method but that wont work for me, because you need to tell him the length of the string.

this.test = buf.readMap(READSTRING, buf.readInt());

So would be nice instead of giving me links to wikis which only help me 60% to actually give me that 1 line of code, if you know.

 

writeMap I dont understand at all. First parameter is the map itself and then two writers. One for the keys and the other one for the entries.

buf.writeMap(this.test, KEYWRITER, ENTRYWRITER);

I have no clue what to write there, since for example buf.writeInt() (entry) needs the int it writes. Looking at the writeMap code there is forEach-loop which writes all the keys and entries. So I dont need to implement a loop only a one time method call.

 

SO all I'm asking is somebody to tell me, if you know, what I have to write at READSTRING, KEYWRITER and ENTRYWRITER.

[warjort]

Quote

So would be nice instead of giving me links to wikis which only help me 60% to actually give me that 1 line of code, if you know.

This is not a teaching forum. Nor do we write your mod for you.

If we answered open ended questions based on random snippets of garbage code like your original question you would just keep coming back for more,

proxying the creation of your mod to us.

Instead, you need to think about what you are trying to do and research around the topic,

e.g. look at where the methods in question are used in vanilla or other mods doing the same thing.

 

When you have more specific questions that are real road blocks (not I spent 5 minutes trying to do this) you can ask here.

 

Since your latest question is based on specifics (but not sadly not much research), I will answer them.

Quote

But how do I read a String. I found readCharSequence method but that wont work for me, because you need to tell him the length of the string.

There are FriendlyByteBuffer.read/writeUTF() methods for strings. UTF is the java network format of Strings.

NOTE: It has a maximum size of 32K unicode characters. If you want more you need to split the string into multiple strings.

 

Quote

writeMap I dont understand at all. First parameter is the map itself and then two writers. One for the keys and the other one for the entries.

An example can be found in TagNetworkSerialization.NetworkPayload where is serializes a Map<ResourceLocation, IntList> using read/write functions for the respective keys/values.

There will be other examples if you search.

Edited November 26, 2022 by warjort

[Ezio214]

If you gave me that example in the first place, everything would have been faster and clearer. Sry that I ask so much questions around Capabilites...

That system isn't that easy to understand and btw a "Modder Support" forum for me is like a place where I can definitely ask these things if I dont understand them.