ret = setsockopt(sockfd, IPPROTO_IP, IP_MULTICAST_LOOP, (const char *)&loopBack, sizeof(loopBack)); if (-1 == ret) { printf("setsockopt broadcaset error!!!\n"); perror("setsockopt:"); closesocket(sockfd); return -1; }*/ struct ip_mreq ipmr = { 0 }; ipmr.imr_interface.s...
sin_port=htons(HELLO_PORT); if (bind(fd, (struct sockaddr *) &addr, sizeof(addr)) < 0) { perror("bind"); exit(1); } /* use setsockopt() to request that the kernel join a multicast group */ mreq.imr_interface.s_addr=htonl(INADDR_ANY); mreq.imr_multiaddr.s_addr=inet_addr(...
IP_MULTICAST_IF Address of the outgoing multicast-capable interface. This address is used for subsequent multicasts. Use unsigned long for optval. IP_MULTICAST_LOOP Status of the socket's loop behavior during multicast. Use unsigned long for optval. For Windows CE, this value is always 0 and...
if(command.imr_multiaddr.s_addr==-1) { perror("224.1.1.3 not a legal multicast address./n"); exit(EXIT_FAILURE); } if(setsockopt(socket_descriptor, IPPROTO_IP, IP_ADD_MEMBERSHIP,&command,sizeof(command))<0) { perror("setsockopt:IP_ADD_MEMBERSHIP. error/n"); } } printf("start reci...
在输出的信息中,找到“多播地址”(Multicast Addresses)一栏,其中列出了所有的多播地址。 方法二:使用PowerShell 打开PowerShell:点击开始菜单,输入“powershell”,然后按回车键。 在PowerShell中,输入以下命令并按回车键: 代码语言:txt 复制 Get-NetIPAddress -AddressFamily IPv4 | Where-Object { $_.IPAddress -...
if (bLoopBack) { /*设置返还选项为假,禁止将发送的数据返还给本地接口*/ optval =0; if (setsockopt(socketMul, IPPROTO_IP, IP_MULTICAST_LOOP, (char*)&optval, sizeof(optval)) == SOCKET_ERROR) /*如果设置失败*/ { printf("setsockopt(IP_MULTICAST_LOOP) failed: %d\n", ...
环境:windows 双网卡机器:192.168.6.35192.168.3.7 2台单网卡机器:192.168.6.13192.168.3.6 测试: 1.双网卡机器不指定ip直接发送,3网段接收到组播信息,证明双网卡机器使用默认ip为 192.168.3.7. 2.双网卡机器不指定ip加入组播组,然后使用setsockopt(sock,IPPROTO_IP, IP_MULTICAST_IF,(char*)&addr,sizeof(addr)...
setsockopt( sock, IPPROTO_IP, IP_MULTICAST_TTL, (char *)&ttl, sizeof(ttl)); Multicast datagrams with a TTL of 0 are not transmitted on any subnetwork. Multicast datagrams with a TTL of greater than 1 may be delivered to more than one subnetwork, if there are one or more multicast ...
...在使用组播模式时,需要在套接字上使用setsockopt()函数来设置套接字的IP_MULTICAST_IF选项,指定本地主机的出站接口地址,用于发送组播数据包。...此外,还可以设置IP_ADD_MEMBERSHIP选项,将套接字加入到一个特定的组播组中,以便接收该组播组中的数据包。...在使用组播模式时需要读者注意,组播模式需要使用特定...
if( 0 == retCode ) { DWORD loop; DWORD ip; loop = 1; retCode = setsockopt( m_Socket, IPPROTO_IP , IP_MULTICAST_LOOP, (const char*)&loop, sizeof(loop) ); if( SOCKET_ERROR == retCode ) { wsaErrCode = WSAGetLastError();