Server

#include <stdio.h>
#include <Ws2tcpip.h>
#include <winsock2.h>  
#pragma comment(lib,"ws2_32.lib")
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#define PORT  6060   
#define IP "ff02::2"    
#define BUF_LEN 256  
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int main(int argc, char* argv[])
{
    WSADATA     wsaData;
    WORD wVersionRequested;                   // 版本
    wVersionRequested = MAKEWORD(1, 1);       //版本資訊
    WSAStartup(wVersionRequested, &wsaData);  //初始化Windows套接字庫
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    //使用此結構來指定將套接字連接到的本地或遠程端點地址
    struct sockaddr_in6 addr = { AF_INET6, htons(PORT) };
    
    //創建一個UDP套接字
    int l_nServer;
    if ((l_nServer = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
    {
        perror("創建失敗");
        return -1;
    }
    bind(l_nServer, (struct sockaddr*)&addr, sizeof(addr));
    //ipv6_mreq結構提供了用于IPv6地址的多播組的資訊，
    struct ipv6_mreq group;
    //將介面索引指定為0，則使用默認的多播介面，
    group.ipv6mr_interface = 0;
    //IPv6組播組的地址，
    inet_pton(AF_INET6, IP, &group.ipv6mr_multiaddr);
    //將套接字加入到指定介面上提供的多播組，此選項僅對資料報和原始套接字有效（套接字類>型必須為SOCK_DGRAM或SOCK_RAW），
    setsockopt(l_nServer, IPPROTO_IPV6, IPV6_ADD_MEMBERSHIP, (char*)&group, sizeof(group));
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    int l_naddLen = sizeof(addr);
    int l_nReadLen = 0;
    char msgbuf[BUF_LEN];
    printf("等待接收\n");
    while (1)
    {
        l_nReadLen = recvfrom(l_nServer, msgbuf, BUF_LEN, 0, (struct sockaddr*)&addr, &l_naddLen);
        if (l_nReadLen < 0)
        {
            perror("接收失敗");
            exit(1);
        }
        msgbuf[l_nReadLen] = '\0';
        printf("%s\n", msgbuf);
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        strcpy_s(msgbuf, "world");
        int l_nLen = sendto(l_nServer, msgbuf, strlen(msgbuf), 0, (struct sockaddr*)&addr, sizeof(addr));
        if (l_nLen < 0)
        {
            perror("發送失敗");
            exit(1);
        }
        printf("Send %s\n", msgbuf);
    }
   
    return 0;
}

Cilect

#include <stdio.h>
#include <Ws2tcpip.h>
#include <winsock2.h>
#define HELLO_PORT  7905    
#define HELLO_GROUP "224.0.0.1"    
#pragma comment(lib,"ws2_32.lib")
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int main(int argc, char* argv[])
{
    WSADATA     wsaData;
    WORD wVersionRequested;
    wVersionRequested = MAKEWORD(1, 1);
    // Initialize Windows socket library
    WSAStartup(0x0202, &wsaData);
    int l_nCilect;
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    struct sockaddr_in6 addr = { AF_INET6, htons(6060) };
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    /* 創建一個UDP套接字 */
    if ((l_nCilect = socket(AF_INET6, SOCK_DGRAM, 0)) < 0)
    {
        perror("創建失敗");
        exit(1);
    }
    inet_pton(AF_INET6, "ff02::2", &addr.sin6_addr);
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    char message[128];
    int l_naddLen = sizeof(addr);
    while (1)
    {
        strcpy_s(message, "hello");
        int l_nLen = sendto(l_nCilect, message, strlen(message), 0, (struct sockaddr*)&addr, sizeof(addr));
        if (l_nLen < 0)
        {
            perror("發送失敗");
            exit(1);
        }
        printf("Send %s\n", message);
        Sleep(1000);
        int l_nReadLen = recvfrom(l_nCilect, message, strlen(message), 0, (struct sockaddr*)&addr, &l_naddLen);
        if (l_nReadLen < 0)
        {
            perror("接收失敗");
            exit(1);
        }
        message[l_nReadLen] = '\0';
        printf("%s\n", message);
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    }
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    return 0;
}

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