最近需要用到网络编程中的广播程序，在网上找了下，亲测可用。

客户端：

1 #include 
     
       2 #include 
      
        3 #include 
       
         4 #include 
        
          5 #include 
         
           6 #include 
          
            7 8 9 int main(void)10 {11 struct sockaddr_in all;12 int fd;13 //广播消息14 char buff[]="this is a broadcast message";15 int so_boradcast=1;16 17 //IPv4 UDP18 fd=socket(AF_INET,SOCK_DGRAM,0);19 //广播地址，用ifconfig查看得到20 all.sin_addr.s_addr=inet_addr("192.168.1.255");21 all.sin_family=AF_INET;22 //端口号23 all.sin_port=htons(8888);24 //设置socket为广播25 setsockopt(fd,SOL_SOCKET,SO_BROADCAST,&so_boradcast,sizeof(so_boradcast));26 27 while(1)28 {29 //广播30 sendto(fd,buff,strlen(buff),0,(struct sockaddr *)&all,sizeof(all));31 //延时1秒32 sleep(1);33 }34 return 0;35 }
          
         
        
       
      
     

服务器端：

1 #include 
     
       2 #include 
      
        3 #include 
       
         4 #include 
        
          5  6 int main(int argc,char *argv[]) 7 { 8     int fd; 9     struct sockaddr_in server;10     struct sockaddr_in client;11     int status;12 13     //IPv4 UDP14     fd=socket(AF_INET,SOCK_DGRAM,0);15     //端口号16     server.sin_port=htons(8888);17     server.sin_addr.s_addr=INADDR_ANY;18     server.sin_family=AF_INET;19 20     //绑定地址21     status=bind(fd,(struct sockaddr *)&server,sizeof(struct sockaddr));22     if(status<0)23     {24         printf(" bind() error\n");25         exit(1);26     }27     //接收Buffer28     char buff[1024];29     socklen_t len=sizeof(struct sockaddr);30 31     while(1)32     {33         //接收34         recvfrom(fd,buff,1024,0,(struct sockaddr *)&client,&len);35         //打印接收到的信息36         printf("%s\n",buff);37     }38 39     return 0;40 }