Pointer to class

Hello, I need interaction between classes and I do it this way:

Code:

class tcp_packet
{
    private:

    public:
        int *from;
    .....
};

class con_client
{
    private :
        int sock;
    public :
        DWORD ServeClient();
        ....
};

........

DWORD con_client::ServeClient()
{
...
cResult =  recv(this->sock, (char*)RecPck.buff, 1024, 0);
        if (cResult > 0)
        {
            RecPck.size = cResult;
            RecPck.from = (int*)this;
        }
...
}

void tcp_packet_s_handler::read_Login(tcp_packet pck)
{
    con_client *c;
    c = (con_client*)pck.from;
}

But it doesnt work, whats wrong there?

how do you propose to convert the data in that packet into an address of an instance of your con client class?