How to read arbitrary length of ByteArray from token?

SPF · November 2020

I'm trying send event with token, with complex data. This is what I do:

using UnityEngine;
using Bolt;
using UdpKit;
//using System.Linq;
using System.Runtime.Serialization.Formatters.Binary;
using System.IO;

public class ListOfIntToken : IProtocolToken
{
    public List<int> intList;

    public void Read(UdpPacket packet)
    {
        var objectBytes = packet.ReadByteArray(5);
        var mStream = new MemoryStream();
        var binFormatter = new BinaryFormatter();
        mStream.Write(objectBytes, 0, objectBytes.Length);
        mStream.Position = 0;

        var myObject = binFormatter.Deserialize(mStream) as List<int>;
    }

    public void Write(UdpPacket packet)
    {
        var binFormatter = new BinaryFormatter();
        var mStream = new MemoryStream();
        binFormatter.Serialize(mStream, intList);
        //byte[] bytes = userId.Select(x => (byte)x).ToArray();
        packet.WriteByteArray(mStream.ToArray());
    }
}

"var objectBytes = packet.ReadByteArray(5);" This line uses 5 as example, but actually the length of the ByteArray is not fixed. So how should I read arbitrary length of ByteArray from token?

SPF · November 2020

Besides the main question, I'm not very familiar with Bytes. So for a List of data, or Dictionary of data, or custom class, how should I decide the size to pass on to "ReadByteArray()"?

DirtyHippy · November 2020

UdpPacket has a ton of methods/extension methods for writing binary data directly into the packet stream. And understanding what a byte is, is kind of an entry level requirement for networking.

SPF · November 2020

@DirtyHippy That's for sure. I understand what byte is and basic theory related staff. I'm just looking for more Bolt related docs and examples that I can study from.

SPF · November 2020

@DirtyHippy I changed the codes to the following, could you kindly check on it please? It works but there's a little issue. I have two clients running A and B. A is server. Both are sending the event with this token but with different data for testing. In `Write` method I print the `byteArraySize` out, and when the data are received on server I print them out too. The `byteArraySize` for A's data is 0, and the time it's printed is before the printing line in`Write` method, where the size was 221. However for B's data the size was correct. What may causes this problem?

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using Bolt;
using UdpKit;
//using System.Linq;
using System.Runtime.Serialization.Formatters.Binary;
using System.IO;

public class ListOfIntToken : IProtocolToken
{
    public List<int> intList;
    public int byteArraySize;

    public void Read(UdpPacket packet)
    {
        byteArraySize = packet.ReadInt();
        var objectBytes = packet.ReadByteArray(byteArraySize);
        var mStream = new MemoryStream();
        var binFormatter = new BinaryFormatter();
        mStream.Write(objectBytes, 0, objectBytes.Length);
        mStream.Position = 0;
        intList = binFormatter.Deserialize(mStream) as List<int>;
    }

    public void Write(UdpPacket packet)
    {
        var binFormatter = new BinaryFormatter();
        var mStream = new MemoryStream();
        binFormatter.Serialize(mStream, intList);
        //byte[] bytes = userId.Select(x => (byte)x).ToArray();
        var byteArray = mStream.ToArray();
        byteArraySize = byteArray.Length;
        packet.WriteInt(byteArraySize);
        packet.WriteByteArray(byteArray);
    }
}

How to read arbitrary length of ByteArray from token?

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