?

一.廣播

1.接收

void main() {SOCKET s = ::socket(AF_INET, SOCK_DGRAM, 0);// 首先要綁定一個本地地址，指明廣播端口號SOCKADDR_IN sin;sin.sin_family = AF_INET;sin.sin_addr.S_un.S_addr = INADDR_ANY; sin.sin_port = ::ntohs(4567);if(::bind(s, (sockaddr*)&sin, sizeof(sin)) == SOCKET_ERROR){printf(" bind() failed \n");return;}// 接收廣播printf(" 開始在4567端口接收廣播數(shù)據(jù)... \n\n");SOCKADDR_IN addrRemote; int nLen = sizeof(addrRemote);char sz[256];while(TRUE){int nRet = ::recvfrom(s, sz, 256, 0, (sockaddr*)&addrRemote, &nLen);if(nRet > 0){sz[nRet] = '\0';printf(sz);}} }

2.發(fā)送

void main() {SOCKET s = ::socket(AF_INET, SOCK_DGRAM, 0);// 有效SO_BROADCAST選項BOOL bBroadcast = TRUE;::setsockopt(s, SOL_SOCKET, SO_BROADCAST, (char*)&bBroadcast, sizeof(BOOL)); // 設(shè)置廣播地址，這里的廣播端口號（電臺）是4567SOCKADDR_IN bcast;bcast.sin_family = AF_INET;bcast.sin_addr.s_addr = INADDR_BROADCAST; // ::inet_addr("255.255.255.255");bcast.sin_port = htons(4567);// 發(fā)送廣播printf(" 開始向4567端口發(fā)送廣播數(shù)據(jù)... \n \n");char sz[] = "This is just a test. \r\n";while(TRUE){::sendto(s, sz, strlen(sz), 0, (sockaddr*)&bcast, sizeof(bcast));::Sleep(5000);} }

二.IP多播

1.加入多播組并接收數(shù)據(jù)

void main() {SOCKET s = ::socket(AF_INET, SOCK_DGRAM, 0);// 允許其它進程使用綁定的地址BOOL bReuse = TRUE;::setsockopt(s, SOL_SOCKET, SO_REUSEADDR, (char*)&bReuse, sizeof(BOOL)); // 綁定到4567端口sockaddr_in si;si.sin_family = AF_INET;si.sin_port = ::ntohs(4567);si.sin_addr.S_un.S_addr = INADDR_ANY;::bind(s, (sockaddr*)&si, sizeof(si));// 加入多播組ip_mreq mcast;mcast.imr_interface.S_un.S_addr = INADDR_ANY;mcast.imr_multiaddr.S_un.S_addr = ::inet_addr("234.5.6.7"); // 多播地址為234.5.6.7::setsockopt(s, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char*)&mcast, sizeof(mcast));// 接收多播組數(shù)據(jù)printf(" 開始接收多播組234.5.6.7上的數(shù)據(jù)... \n");char buf[1280];int nAddrLen = sizeof(si);while(TRUE){int nRet = ::recvfrom(s, buf, strlen(buf), 0, (sockaddr*)&si, &nAddrLen);if(nRet != SOCKET_ERROR){buf[nRet] = '\0';printf(buf);}else{int n = ::WSAGetLastError();break;}} }

2.發(fā)送廣播

同上

設(shè)置SO_REUSEADDR,則允許多個進程綁定到這個端號,這樣加入到同個端口的組都可以接收到數(shù)據(jù)

三.源地址的IP多播

即可指定接收組內(nèi)特定IP地址的消息

c#參考：http://www.cnblogs.com/xuhx/archive/2004/06/23/18150.html
http://www.cnblogs.com/xuhx/archive/2004/06/27/18960.html

Windows網(wǎng)絡(luò)與通信程序設(shè)計 第5章

轉(zhuǎn)載于:https://www.cnblogs.com/Clingingboy/archive/2011/06/21/2086349.html

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