windows下UDP单播、广播播和组播实例

#include <stdio.h> #include <winsock2.h> #include <ws2tcpip.h> #pragma comment(lib, "ws2_32.lib") int main() { int iRet = 0; WSADATA wsaData; WSAStartup(MAKEWORD(2, 2), &wsaData); SOCKET sock = socket(AF_INET, SOCK_DGRAM, 0); sockaddr_in addr; addr.sin_family = AF_INET; //addr.sin_addr.S_un.S_addr = INADDR_ANY; addr.sin_addr.S_un.S_addr = inet_addr("192.168.0.104"); addr.sin_port = htons(9411); bool bOptval = true; iRet = setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char*)&bOptval, sizeof(bOptval)); if(iRet != 0){ printf("setsockopt fail:%d", WSAGetLastError()); return -1; } iRet = bind(sock, (sockaddr*)&addr, sizeof(addr)); if(iRet != 0){ printf("bind fail:%d", WSAGetLastError()); return -1; } printf("socket:%d bind success\n", sock); // 加入组播 ip_mreq multiCast; //multiCast.imr_interface.S_un.S_addr = INADDR_ANY; multiCast.imr_interface.S_un.S_addr = inet_addr("192.168.0.104"); multiCast.imr_multiaddr.S_un.S_addr = inet_addr("234.2.2.2"); iRet = setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char*)&multiCast, sizeof(multiCast)); if(iRet != 0){ printf("setsockopt fail:%d", WSAGetLastError()); return -1; } printf("udp group start\n"); int len = sizeof(sockaddr); char strRecv[1024] = {0}; while(true) { memset(strRecv, 0, sizeof(strRecv)); iRet = recvfrom(sock, strRecv, sizeof(strRecv) - 1, 0, (sockaddr*)&addr, &len); if(iRet <= 0){ printf("recvfrom fail:%d", WSAGetLastError()); return -1; } printf("recv data:%s\n", strRecv); } closesocket(sock); WSACleanup(); return 0; }