ssdp协议获取局域网设备 求大神或者做过的人指点！

[mikeconan]

不多说直接上代码！

int ReceiveData(int socket, char * data, int length, int timeout)
{
int n;
fd_set socketSet;
struct timeval timeval;
FD_ZERO(&socketSet);
FD_SET(socket, &socketSet);
timeval.tv_sec = timeout / 1000;
timeval.tv_usec = (timeout % 1000) * 1000;
n = select(socket + 1, &socketSet, NULL, NULL, &timeval);
if (n < 0) {
printf("select");
return -1;
}
else if (n == 0) {
return 0;
}
n = recv(socket, data, length, 0);
if (n < 0) {
printf("recv");
}
return n;
}

//发广播包
SArray<string> UpnpTool::upnpDiscover(int delay, const char * multicastif)
{
SArray<string> devlist;
WSADATA wsaData;
int opt = 1;
static const char MSearchMsgFmt[] = "M-SEARCH * HTTP/1.1\r\n HOST: 239.255.255.250:1900\r\n ST: %s\r\n MAN: ssdp:discover\r\n MX: 3\r\n\r\n";

char bufr[1536]; /* reception and emission buffer */
int sudp;
int n;
struct sockaddr_in sockudp_r, sockudp_w;

if (WSAStartup(MAKEWORD(2, 0), &wsaData) == SOCKET_ERROR){
return devlist;
}

sudp = socket(AF_INET, SOCK_DGRAM, 0);
if (sudp < 0)
{
WSACleanup();
return devlist;
}
memset(&sockudp_r, 0, sizeof(struct sockaddr_in));//
sockudp_r.sin_family = AF_INET;
sockudp_r.sin_port = htons(65364);
sockudp_r.sin_addr.s_addr = inet_addr("192.168.168.133");

memset(&sockudp_w, 0, sizeof(struct sockaddr_in));
sockudp_w.sin_family = AF_INET;
sockudp_w.sin_port = htons(PORT);
sockudp_w.sin_addr.s_addr = inet_addr(UPNP_MCAST_ADDR); //htonl(INADDR_BROADCAST)

if (setsockopt(sudp, SOL_SOCKET, SO_REUSEADDR, (const char *)&opt, sizeof(int)) < 0)
{
goto failed;
}
opt = 1;
if (setsockopt(sudp, SOL_SOCKET, SO_BROADCAST, (const char *)&opt, sizeof(int)) < 0)
{
goto failed;
}

if (multicastif)
{
struct in_addr mc_if;
mc_if.s_addr = inet_addr(multicastif);
sockudp_r.sin_addr.s_addr = mc_if.s_addr;
if (setsockopt(sudp, IPPROTO_IP, IP_MULTICAST_IF, (const char *)&mc_if, sizeof(mc_if)) < 0)
{
goto failed;
}
}
if (bind(sudp, (struct sockaddr*)&sockudp_r, sizeof(struct sockaddr_in)) != 0) {
goto failed;
}
int trynum = 1;
while (trynum > 0) {
SLOGFMTE("剩余尝试次数%d \n", trynum);
/* sending the SSDP M-SEARCH packet */
sprintf(bufr, MSearchMsgFmt, "urn:schem-as-upnp-org:device:MediaServer:"); // //ssdp:all
sockudp_w.sin_addr.s_addr = inet_addr(UPNP_MCAST_ADDR);
n = sendto(sudp, bufr, strlen(bufr), 0, (struct sockaddr*)&sockudp_w, sizeof(struct sockaddr_in));
if (n < 0) {
goto failed;
}
sockudp_w.sin_addr.s_addr = htonl(INADDR_BROADCAST);
n = sendto(sudp, bufr, strlen(bufr), 0, (struct sockaddr*)&sockudp_w, sizeof(struct sockaddr_in));

if (n < 0) {
SLOGFMTE("Find upnp device broadcast fail!");
}
do
{
//memset(bufr, 0, sizeof(bufr));
int ret = recvfrom(sudp, bufr, sizeof(bufr), 0, (struct sockaddr*)&sockudp_r, (socklen_t*)&sockudp_r);
n = ReceiveData(sudp, bufr, sizeof(bufr), delay);
if (n > 0) {
bufr[n] = 0;
SLOGFMTE("%s", bufr);
string deviceString = bufr;
if (!deviceString.empty())
{
devlist.Add(deviceString);
}
}
} while (n > 0);
trynum--;
// usleep(600);
}
failed:
closesocket(sudp);
WSACleanup();
return devlist;
}

没有响应，直接抓包，也没有发送出去，哪位看下，哪里错了！

[zgl7903]

http://blog.csdn.net/sakaue/article/details/27308313

[mikeconan]

终于解决问题了！知道哪里错了！

[mikeconan]

我只要一个简单的例子，你这个还包括服务端的，还用了boost 库，与我想要的相差很远啊！

[tf_ace]

假设我局域网内有两台PC（ｗｉｎ10）分别为A和B，我用A以编码方式向组播地址发送search消息，B设备（ssdp discover 服务开启）收到后是否会自动回应A的消息？ 我测试过程中发现，A没有收到B回复search的消息；打开B的媒体流选项并启用媒体流后，A才能收到B的回复，这是为什么？

[林兴南]

大佬，有没有关于设备发现的资料 给点