如果已被其他应用程序打开，则无法在Windows XP上打开SSDP套接字
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我想在端口1900上侦听SSDP多播。该端口已由Windows Discovery Service打开。即使使用SO_REUSEADDR套接字选项，我也无法绑定套接字。我以管理员身份启动我的应用程序。
如果我停止该服务，请启动我的应用程序，然后重新启动该服务，然后两者均会收到消息。我究竟做错了什么？
static SOCKET CreateSocket(const char *ccAddress, unsigned short ulPort, struct IfPoolItem *item) {
struct sockaddr_in sAddr;
struct ip_mreq mc_req;
SOCKET sRet;
char cSockParam = TRUE;
/* create a socket */
if((sRet = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) == INVALID_SOCKET)
{
return(INVALID_SOCKET);
}
item->s = sRet;
if (setsockopt(sRet, IPPROTO_IP, SO_REUSEADDR, &cSockParam, sizeof(cSockParam)) == -1) {
int iTmp = WSAGetLastError();
return (INVALID_SOCKET);
}
/* bind the socket to the given port */
memset(&sAddr, 0, sizeof(sAddr));
sAddr.sin_family = AF_INET;
sAddr.sin_addr.s_addr = inet_addr(item->szIP);
sAddr.sin_port = htons(ulPort);
if(bind(sRet, (struct sockaddr *)&sAddr, sizeof(sAddr)) == SOCKET_ERROR)
{
int iTmp = WSAGetLastError();
closesocket(sRet);
return(INVALID_SOCKET);
}
cSockParam = 4;
if (setsockopt(sRet, IPPROTO_IP, IP_MULTICAST_TTL, &cSockParam, sizeof(cSockParam)) == -1) {
int iTmp = WSAGetLastError();
return (INVALID_SOCKET);
}
/* Construct an IGMP join request structure */
mc_req.imr_multiaddr.s_addr = inet_addr(ccAddress);
mc_req.imr_interface.s_addr = inet_addr(item->szIP);
/* Send an ADD_MEMBERSHIP message via setsockopt */
if((setsockopt(sRet, IPPROTO_IP, IP_ADD_MEMBERSHIP, (char FAR *) &mc_req, sizeof(mc_req))) == -1) {
int iTmp = WSAGetLastError();
return (INVALID_SOCKET);
}
/* Return the created socket. */
return(sRet);
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2 个回复
容淑阔九
请尝试此操作，让我知道它是否有作用芜任亮蜡