Cからdouble型の配列をバイナリにしてUDPで送り、unityのBitConverterで受け取る

Cから [0, 1, 0.0005, -0.0009] という配列をUDPで送り、Unity側でdouble配列に戻す。

送信（C）側

udp.c

#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <netdb.h>
#include <sys/socket.h>

#define INTERVAL_TIME 1

void udpSend (char* address, int port);
int port = 20001;
char addr[] = "0.0.0.0";
double data[] = { 0, 1, 0.0005, -0.0009 };

int main()
{
    udpSend(addr,port);
    return 0;
}

void udpSend(char* address, int port)
{
    int udp = socket(AF_INET,SOCK_DGRAM,0);
    struct sockaddr_in addr;
    struct hostent *host;

    memset(&addr, 0, sizeof(addr));
    host = gethostbyname(address);
    memcpy(host->h_addr, &addr.sin_addr, host->h_length);
    addr.sin_family = AF_INET;
    addr.sin_port = htons(port);

    while (1)
    {
        sendto(udp, (unsigned char*) data, sizeof data, 0, (struct sockaddr *)&addr, sizeof(addr));
        sleep(INTERVAL_TIME);
    }

    close(udp);
}

コンパイルして送信開始。

$ gcc udp.c
$ ./a.put

受信（Unity）側。適当なGameObjectにくっつけておく

UDPReceive.cs

using System;
using UnityEngine;
using System.Collections;
using System.Net;
using System.Net.Sockets;
using System.Threading;

public class UDPReceive : MonoBehaviour
{
    private const int DATA_LENGTH = 4;
    private const int DOUBLE_LENGTH = 8;
    private UdpClient udp;
    private Thread thread;
    private byte[] data;
    private double[] result = new double[DATA_LENGTH];

    void Start ()
    {
        udp = new UdpClient (20001);
        thread = new Thread (new ThreadStart (threadWork));
        thread.Start (); 
    }

    void Update()
    {
        if (data != null)
        {
            Debug.LogFormat ("{0}, {1}, {2}, {3}", result[0], result[1], result[2], result[3]);
        }
    }

    void OnApplicationQuit()
    {
        udp.Close ();
        thread.Abort ();
    }

    void threadWork()
    {
        while(true)
        {
            IPEndPoint remoteEP = null;
            data = udp.Receive(ref remoteEP);

            for (int i = 0; i<DATA_LENGTH; i++)
            {
                result[i] = BitConverter.ToDouble(data, i * DOUBLE_LENGTH);
            }
        }
    }
}