[cpp]?view plaincopy

//?發送端??

#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;??

????//設置該套接字為廣播類型，??

????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);??

????????//從廣播地址發送消息??

????????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;??

}??

?

[cpp]?view plaincopy

//?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);???

??

????//?綁定地址??

????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);??

??????

????//?廣播地址??

????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;??

????//設置該套接字為廣播類型，??

????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)??

????{??

????????//從廣播地址接受消息??

????????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;??

} ?

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