PC程序为何搜索不到蓝牙设备

int _tmain(int argc, _TCHAR* argv[]){    WSADATA wsaData;    DWORD dwResult;    HANDLE hLookup = 0;    WSAQUERYSET lpRestrictions;    GUID guid = SVCID_HOSTNAME;    dwResult = WSAStartup(MAKEWORD(2,2), &wsaData);    if (dwResult != 0)    {        printf("Cannot startup Winsock, error code %d\n", dwResult);        exit(1);    }    else        printf("WSAStartup is OK!\n");    ZeroMemory(&lpRestrictions, sizeof(WSAQUERYSET));    lpRestrictions.dwSize = sizeof(WSAQUERYSET);    lpRestrictions.lpServiceClassId = &guid;    dwResult = WSALookupServiceBegin(&lpRestrictions, LUP_RETURN_NAME, &hLookup);    if (dwResult != SOCKET_ERROR)    {        DWORD dwLength = 0;        WSAQUERYSET * pqs = NULL;        printf("WSALookupServiceBegin() is OK!\r\n");        pqs = (WSAQUERYSET *) malloc(sizeof(WSAQUERYSET) + 100);        dwLength = sizeof(WSAQUERYSET) + 100;        do        {            if (WSALookupServiceNext(hLookup, 0, &dwLength, pqs) != 0)            {                dwResult = WSAGetLastError();                if((dwResult == WSA_E_NO_MORE) || (dwResult == WSAENOMORE))                {                    printf("No more record found!\n");                    break;                }                printf("WSALookupServiceNext() failed with error code %d\n", WSAGetLastError());            }            else            {                dwResult = 0;                printf("WSALookupServiceNext() looks fine!\r\n");            }            if (dwResult == WSAEFAULT)            {                if (pqs)                {                    printf("Freeing pqs...\r\n");                    free(pqs);                }                // Reallocate                pqs = (WSAQUERYSET *) malloc(dwLength);                if (!pqs)                {                    printf("Could not allocate memory: %d\n", GetLastError());                    exit(2);                }                else                {                    printf("Memory allocated for pqs successfully!\r\n");                    continue;                }            }            // Output it since we have it now            if ((dwResult == 0) && (pqs))            {                printf("  Service instance name: %S\n", pqs->lpszServiceInstanceName);                printf("  Name space num: %d\r\n", pqs->dwNameSpace);                printf("  Num of protocols: %d\r\n", pqs->dwNumberOfProtocols);                //printf("  Version: %d\r\n", pqs->lpVersion->dwVersion);            }        } while ((dwResult != WSA_E_NO_MORE) && (dwResult != WSAENOMORE));        // clean-up        free(pqs);        if(WSALookupServiceEnd(hLookup) == 0){            printf("hLookup handle was released!\n");        }        else{            printf("WSALookupServiceEnd(hLookup) failed with error code %d\n", WSAGetLastError());        }    }    else    {        printf("Error on WSALookupServiceBegin: %d\n", WSAGetLastError());        exit(3);    }    if(WSACleanup() == 0){        printf("WSACleanup() is OK!\n");    }    else{        printf("WSACleanup() failed with error code %d\n", WSAGetLastError());    }    printf("按回车键退出!\n");    char c = getchar();    return 0;}