在c ++中发现UPnP？

Question

我试图在c ++应用程序中实现UpNp，我发现这个代码与谷歌：

BOOL upnp_discover( upnp_device_t* Device, ushort Tries )
{
    SOCKET              Sock;
    struct sockaddr_in  Addr;
    char                Buffer[1450],
                       *Begin   = NULL,
                       *End     = NULL;
    int                 i       = 0,
                        t       = 0,
                        Ret     = 0,
                        TrueLen = sizeof(bool);
    bool                True    = true;
    ulong               One     = 1,
                        Zero    = 0;
    Sock = socket( AF_INET, SOCK_DGRAM, IPPROTO_UDP );
    memset( &Addr, 0, sizeof(Addr) );
    Addr.sin_family      = AF_INET;
    Addr.sin_port        = htons( upnp_broadcast_port );
    Addr.sin_addr.s_addr = inet_addr( upnp_broadcast_ip );
    Ret = setsockopt( Sock, SOL_SOCKET, SO_BROADCAST, (char*)&True, TrueLen );
    for( i = 0; i < Tries; ++i )
    {
        memset( &Buffer, 0, sizeof(Buffer) );
        strcpy( Buffer, upnp_search_request );
        sendto( Sock, Buffer, strlen(Buffer), 0, (struct sockaddr*)&Addr, sizeof(Addr) );
        for( t = 0; t < 10; ++t )
        {
            ioctlsocket( Sock, FIONBIO, &One );
            memset( &Buffer, 0, sizeof(Buffer) );
            Ret = recvfrom( Sock, Buffer, (sizeof(Buffer) - 1), 0, NULL, NULL );
            if( Ret == SOCKET_ERROR)
            {
                Sleep( 1000 );
                continue;
            } else {
                Begin = strstr( Buffer, "http://" );
                if( Begin != NULL )
                {
                    End = strchr( Begin, '\r' );
                    if( End != NULL )
                    {
                        *End = '\0';
                        strncpy( Device->Location, Begin, (sizeof(Device->Location) - 1) );
                        upnp_parse_url( Device );
                        closesocket( Sock );
                        return TRUE;
                    }
                }
            }
        }
        ioctlsocket( Sock, FIONBIO, &Zero );
    }
    closesocket( Sock );
    return FALSE;
}

但它始终返回false，并且在启用了UPnP的路由器后面。我在谷歌上找到了一些其他的资源，但是他们对他们所属的应用程序的其余部分过于依赖，因为我在c ++上有点新意，我几乎无法理解它们。

有人有一个在c ++中使用UpNP的简单例子吗？

---

编辑：

调试显示：

Ret = recvfrom( Sock, Buffer, (sizeof(Buffer) - 1), 0, NULL, NULL );

总是-1（SOCKET_ERROR），有人知道为什么会这样吗？

Answer 1

您可以查看此link以获取与UPnP相关的源代码

Answer 2

我想知道你是否愿意利用Windows中现有的UPnP APIs。

目的

UPnP™框架支持智能设备，无线设备和PC的动态联网。有两个API可用于使用UPnP认证的设备：

The Control Point API, which consists of a set of COM interfaces used to find and control devices.
The Device Host API, which consists of a set of COM interfaces used to implement devices that are hosted by a computer.

Answer 3

还有一个免费的UPnP库，适用于家庭NAT上的端口转发：http://miniupnp.free.fr/