udp_client_unity.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System;
using System.Net;
using System.Net.Sockets;
using System.Text;

public class UDPClient : MonoBehaviour
{
    public byte[] buffer = new byte[bufSize];
    private Socket socket = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
    private const int bufSize = 256;
    private EndPoint epFrom = new IPEndPoint(IPAddress.Any, 0);

    void Awake()
    {
        InitClient("127.0.0.1", 9034); 
    }

    void InitClient(string address, int port)
    {
        socket.Connect(IPAddress.Parse(address), port);
        socket.BeginReceiveFrom(buffer, 0, bufSize, SocketFlags.None, ref epFrom, ReceiveHandler,buffer);
    }

    private void ReceiveHandler(IAsyncResult ar)
    {
        int bytes = socket.EndReceiveFrom(ar, ref epFrom);
        socket.BeginReceiveFrom(buffer, 0, bufSize, SocketFlags.None, ref epFrom, ReceiveHandler, buffer);
        Debug.LogFormat("RECV: {0}: {1}, {2}", epFrom.ToString(), bytes, Encoding.ASCII.GetString(buffer, 0, bytes));
    }

    public void Send(string text)
    {
        byte[] data = Encoding.ASCII.GetBytes(text);
        socket.BeginSend(data, 0, data.Length, SocketFlags.None, (ar) =>
        {
            int bytes = socket.EndSend(ar);
            Debug.LogFormat("SEND: {0}, {1}", bytes, text);
        }, buffer);
    }

    public void SendFromUI(UnityEngine.UI.InputField input)
    {
        Send(input.text);
    }

    void Update()
    {
        
    }

}