[ENet-discuss] How to send and recevice boradcast packets using enet

[enetcub]

enet-discuss，
 
  i just be in a spot  with send and receiveing BROADCAST packets in enet, i don't know what is the right way to playing with function enet_socket_receive

//sender_code

    P2UdpSocket sck=p2udp_socket_create(P2UDP_SOCKET_TYPE_DATAGRAM);
    if(INVALID_SOCKET == sck){
        fprintf(stderr,"error while create sccket\n");
        return(EXIT_FAILURE);
    }
    //set as broadcast option
    p2udp_socket_set_option(sck,P2UDP_SOCKOPT_BROADCAST,1);
    //set broadcast addrs
    P2UdpAddress p2u_addr;
    p2u_addr.host=P2UDP_HOST_BROADCAST;
    p2u_addr.port=P2UDP_HOST_TO_NET_16(P2U_PORT);
    printf("starting send broadcast packages...\n");
    //gererate notify package
    char p2u_act_msg[16];
    strcpy(p2u_act_msg,P2U_ASK_ALIVE_FLAG_MSG);
    int p2u_alive_host_count=0;            //queue  length
    while(1){
        p2udp_socket_send(sck,&p2u_addr,&p2u_act_msg,sizeof(p2u_act_msg));
        printf(".");
        Sleep(1000);
    }


//recv_code

   P2UdpSocket sck=p2udp_socket_create(P2UDP_SOCKET_TYPE_DATAGRAM);
    if(INVALID_SOCKET == sck){
        fprintf(stderr,"error while create a cscoket\n");
        return(EXIT_FAILURE);
    }
    p2udp_socket_set_option(sck,P2UDP_SOCKOPT_BROADCAST,1);
    P2UdpAddress serv_addr;
    serv_addr.host=P2UDP_HOST_ANY;
    serv_addr.port=P2UDP_HOST_TO_NET_16(P2U_PORT);
    int iret=p2udp_socket_bind(sck,&serv_addr);
    if(SOCKET_ERROR == iret){
        fprintf(stderr,"bind socket with error\n");
        p2udp_socket_shutdown(sck,0);
        return(EXIT_FAILURE);
    }
    //host who send broadcast msg
    P2UdpAddress host_addr;
    char msg_buf[1024];
    int recv_len=0;
    while(1){printf("data length:%d\n",recv_len);   ------------> this alway got 0 or -1 ,why?
        recv_len=p2udp_socket_receive(sck,&host_addr,&msg_buf,sizeof(msg_buf));
        if(recv_len <= 0){
            fprintf(stderr,"error receiving data..\n");
            //p2udp_socket_shutdown(sck,0);
            //return(EXIT_FAILURE);
            //break;          //no msg or blcked,just wait
        }else{
            static int seq_count=0;
            memset(msg_buf+recv_len,'/0',1);
            printf("get broadcast message from %u:%d with length:%d has content:%s seq_id=%d\n",
                    host_addr.host,
                    host_addr.port,
                    recv_len,
                    msg_buf,
                    seq_count++);
            //check if send is alive flag
            if(strcmp(msg_buf,P2U_ASK_ALIVE_FLAG_MSG)){
                printf("i am alive\n");
            }else{
                printf("i am dead\n");
            }
            memset(msg_buf,0,sizeof(msg_buf));
        }
        Sleep(1000);
    }
    p2udp_socket_shutdown(sck,0);


 
enetcub，enet_club at 126.com
2013-01-07 
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