我試圖連接到使用下面的代碼段的多播組:組播 - 沒有這樣的設備
int flag_on = 1; /* socket option flag */
struct sockaddr_in mc_addr; /* socket address structure */
char recv_str[MAX_LEN+1]; /* buffer to receive string */
int recv_len; /* length of string received */
char* mc_addr_str; /* multicast IP address */
unsigned short mc_port; /* multicast port */
struct sockaddr_in from_addr; /* packet source */
unsigned int from_len; /* source addr length */
mc_addr_str = ip; /* arg 1: multicast ip address */
mc_port = port; /* arg 2: multicast port number */
/* validate the port range */
if ((mc_port < MIN_PORT) || (mc_port > MAX_PORT)) {
fprintf(stderr, "Invalid port number argument %d.\n",
mc_port);
fprintf(stderr, "Valid range is between %d and %d.\n",
MIN_PORT, MAX_PORT);
exit(1);
}
/* create socket to join multicast group on */
// if ((sock = socket(PF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) {
if ((sock = socket(AF_INET, SOCK_DGRAM,IPPROTO_UDP)) < 0) {
perror("socket() failed");
LOGE("*********Inside Join Multicast -- socket() failed*********");
exit(1);
}
LOGE("Socket value = %d ",sock);
/* set reuse port to on to allow multiple binds per host */
if ((setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &flag_on,
sizeof(flag_on))) < 0) {
perror("setsockopt() failed");
LOGE("*********Inside Join Multicast -- socketopt() failed*********");
exit(1);
}
/* construct a multicast address structure */
memset(&mc_addr, 0, sizeof(mc_addr));
mc_addr.sin_family = AF_INET;
mc_addr.sin_addr.s_addr = htonl(INADDR_ANY);
mc_addr.sin_port = htons(mc_port);
/* bind to multicast address to socket */
if ((bind(sock, (struct sockaddr *) &mc_addr,
sizeof(mc_addr))) < 0) {
perror("bind() failed");
LOGE("*********Inside Join Multicast -- bind() failed*********");
exit(1);
}
/* construct an IGMP join request structure */
mc_req.imr_multiaddr.s_addr = inet_addr(mc_addr_str);
mc_req.imr_interface.s_addr = htonl(INADDR_ANY);
/* send an ADD MEMBERSHIP message via setsockopt */
if ((setsockopt(sock, IPPROTO_IP, IP_ADD_MEMBERSHIP,
(void*) &mc_req, sizeof(mc_req))) < 0) {
perror("setsockopt() failed");
LOGE("*********Inside Join Multicast -- socketopt2() failed*********");
LOGE("Value of errno is %s",strerror(errno));
exit(1);
}
和已經收到的錯誤是errno的值是沒有這樣的設備。
我試圖做到這一點的OMAP板 - GB移植。
能否請你幫忙。
大回答解決了我的問題:)謝謝! – info
查找網絡界面並加入使用在我的Android上工作的組。沒有這個'joinGroup(group)'會失敗並顯示錯誤信息'no such device'。 – praneetloke
解決了我的問題!由於 – Semaphor