How to properly split string received from server to update Vector3?

Questions & Answers
1

Hi guys,

I’ve been trying to update my player’s position and rotation with the values received via UDP socket. The data comes without any difficulties, however the final step of assigning the received values to the Vector3 is problematic for me. I’m poorly experienced in C#, that’s why all the errors appear because of incorrect syntaxes. Could somebody please fix my code. Thanks a lot in advance.

I won’t post the whole code here, since it’s working and the data is received. Here is the final step of the data application. Please, tell me if the whole code is needed.

private void receiveData() {
                Debug.Log("Trying to receive data...");
                byte[] data = udpServer.Receive(ref remoteEP);
                if (data.Length > 0)
                {
                    var str = System.Text.Encoding.Default.GetString(data);
                    Debug.Log("Received Data" + str);
		                    string[] messageParts = str.Split(',');
                                             Vector3.transform.position = new Vector3(
                       		                                        messageParts[0], 
                       		                                        messageParts[1],
                       		                                        messageParts[2]
                                              );
			                                 Vector3 transform.rotation = new Vector3(
                       		                                        messageParts[3], 
                       		                                        messageParts[4],
                       		                                        messageParts[5]
                                             );
                }
        }

EDIT The issue is solved now, thanks to @Hellium
Here is the final working script (must be cleaned though). The object receives the coordinates and updates Transform component properly.

using System.Collections.Generic;
   using UnityEngine;
   using System;
   using System.Collections;
   using System.Net;
   using System.Net.Sockets;
   using System.Text;
   using System.Threading;
   public class PlayerBehavior : MonoBehaviour {
       private UdpClient udpServer;
       public GameObject cube;
       private Vector3 tempPos;
       private Thread t;
       public float movementSpeed;
       private long lastSend;
       private IPEndPoint remoteEP;
       private float[] transformPosition = new float[3] ;
       
       void Start()
       {
           udpServer = new UdpClient(1234);
           t = new Thread(() => {
               while (true) {
                   this.receiveData();
  
               }
           });
           t.Start();
           t.IsBackground = true;
           remoteEP = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 41234);
       }
       
       void Update()
       {
           transform.position = new Vector3(transformPosition[0], transformPosition[1], transformPosition[2])  ;
       }
       
       private void OnApplicationQuit()
       {
           udpServer.Close();
           t.Abort();
       }
       
       private void receiveData() {
               
               byte[] data = udpServer.Receive(ref remoteEP);
               if (data.Length > 0)
               {
                   var str = System.Text.Encoding.Default.GetString(data);
                   Debug.Log("Received Data" + str);
                   string[] messageParts = str.Split(',');
                   transformPosition[0] = float.Parse(messageParts[0]) ;
                   transformPosition[1] = float.Parse(messageParts[1]) ;
                   transformPosition[2] = float.Parse(messageParts[2]) ;
               }
       }
   }
2

Good day, I’m not sure what you recieve with recieve data, but if you have a string with numbers and need to transfomr it into a vector3, you should take a look at these 2 functions:

–

Substring: To take only the characters you need from the string data

Parse: To transform the string numbers to float values

–

Then you can build your Vector3.

Bye!

3

@tormentoarmagedoom Sorry for commenting as a reply, don’t know why “add comment” button doesn’t work for me.

Thank you very much for your reply. Yes, I receive a string with 3 different numbers split by “,”. Here is the part of a python code of the server (written not by me)

msg = '%s, %s, %s'%(update_dict['x'], update_dict['y'], update_dict['z'])
            sock.sendto(msg,addr)
            # print('send message %r to %s'%(msg,addr))
           # these "%s values are retrieved from another server, and in unity I get pure numbers

Parse function is great, and causes no errors with syntaxes (for now). However, I get another error. If you could spend some time and have a quick look, that would be great.

Here is the code i have now:

using System.Collections.Generic;
using UnityEngine;
using System;
using System.Collections;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
public class PlayerBehavior : MonoBehaviour {
    private UdpClient udpServer;
    public GameObject cube;
    private Vector3 tempPos;
    private Thread t;
    public float movementSpeed;
    private long lastSend;
    private IPEndPoint remoteEP;
    void Start()
    {
        udpServer = new UdpClient(1234);
        t = new Thread(() => {
            while (true) {
                this.receiveData();
            }
        });
        t.Start();
        t.IsBackground = true;
        remoteEP = new IPEndPoint(IPAddress.Parse("127.0.0.1"), 41234);
    }
    private long UnixTimeNow()
    {
        var timeSpan = (DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0));
        return (long)timeSpan.TotalMilliseconds;
    }
    private void OnApplicationQuit()
    {
        udpServer.Close();
        t.Abort();
    }
    void Update()
    {

        var isShift = Input.GetKey(KeyCode.LeftShift) || Input.GetKey(KeyCode.RightShift);
        if (isShift)
        {
            Debug.Log("Shift");
        }
        var x = Input.GetAxis("Horizontal") * Time.deltaTime * this.movementSpeed;
        var z = Input.GetAxis("Vertical") * Time.deltaTime * this.movementSpeed;
        cube.transform.Translate(x, 0, 0);
        cube.transform.Translate(0, 0, z);
        if (cube.transform.position != tempPos)
        {
            if (UnixTimeNow() - this.lastSend > 1000 / 24)
            {
                this.lastSend = UnixTimeNow();
                byte[] arr = Encoding.ASCII.GetBytes(cube.transform.position.x + ";" + cube.transform.position.y + ";" + cube.transform.position.z);
                udpServer.Send(arr, arr.Length, remoteEP);
            }
        }
        tempPos = cube.transform.position;
    }
    private void receiveData() {
            Debug.Log("Trying to receive data...");
            byte[] data = udpServer.Receive(ref remoteEP);
            if (data.Length > 0)
            {
                var str = System.Text.Encoding.Default.GetString(data);
                Debug.Log("Received Data" + str);
	    string[] messageParts = str.Split(',');
                    transform.position = new Vector3(
                   		float.Parse(messageParts[0]), 
                   		float.Parse(messageParts[1]),
                   		float.Parse(messageParts[2])
                   );
		
            }
    }
 
}

And here is the error: “get_transform can only be called from the main thread.
Constructors and field initializers will be executed from the loading thread when loading a scene.”

Thank you!