Linux系统下UDP发送和接收广播消息
2018-07-20 来源:open-open
发送端源码:
// 发送端 #include <iostream> #include <stdio.h> #include <sys/socket.h> #include <unistd.h> #include <sys/types.h> #include <netdb.h> #include <netinet/in.h> #include <arpa/inet.h> #include <string.h> using namespace std; int main() { setvbuf(stdout, NULL, _IONBF, 0); fflush(stdout); int sock = -1; if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { cout<<"socket error"<<endl; return false; } const int opt = 1; //设置该套接字为广播类型, int nb = 0; nb = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&opt, sizeof(opt)); if(nb == -1) { cout<<"set socket error..."<<endl; return false; } struct sockaddr_in addrto; bzero(&addrto, sizeof(struct sockaddr_in)); addrto.sin_family=AF_INET; addrto.sin_addr.s_addr=htonl(INADDR_BROADCAST); addrto.sin_port=htons(6000); int nlen=sizeof(addrto); while(1) { sleep(1); //从广播地址发送消息 char smsg[] = {"abcdef"}; int ret=sendto(sock, smsg, strlen(smsg), 0, (sockaddr*)&addrto, nlen); if(ret<0) { cout<<"send error...."<<ret<<endl; } else { printf("ok "); } } return 0; }
接收端源码:
// 接收端 #include <iostream> #include <stdio.h> #include <sys/socket.h> #include <unistd.h> #include <sys/types.h> #include <netdb.h> #include <netinet/in.h> #include <arpa/inet.h> #include <string.h> using namespace std; int main() { setvbuf(stdout, NULL, _IONBF, 0); fflush(stdout); // 绑定地址 struct sockaddr_in addrto; bzero(&addrto, sizeof(struct sockaddr_in)); addrto.sin_family = AF_INET; addrto.sin_addr.s_addr = htonl(INADDR_ANY); addrto.sin_port = htons(6000); // 广播地址 struct sockaddr_in from; bzero(&from, sizeof(struct sockaddr_in)); from.sin_family = AF_INET; from.sin_addr.s_addr = htonl(INADDR_ANY); from.sin_port = htons(6000); int sock = -1; if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) == -1) { cout<<"socket error"<<endl; return false; } const int opt = 1; //设置该套接字为广播类型, int nb = 0; nb = setsockopt(sock, SOL_SOCKET, SO_BROADCAST, (char *)&opt, sizeof(opt)); if(nb == -1) { cout<<"set socket error..."<<endl; return false; } if(bind(sock,(struct sockaddr *)&(addrto), sizeof(struct sockaddr_in)) == -1) { cout<<"bind error..."<<endl; return false; } int len = sizeof(sockaddr_in); char smsg[100] = {0}; while(1) { //从广播地址接受消息 int ret=recvfrom(sock, smsg, 100, 0, (struct sockaddr*)&from,(socklen_t*)&len); if(ret<=0) { cout<<"read error...."<<sock<<endl; } else { printf("%s\t", smsg); } sleep(1); } return 0; }
使用g++编译,接收端与发射端要在同一局域网段内。
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