1)Hi guys...I've seen the tutorial and the example, but I don't understand why the function listen() of the acceptor is never called...despite that new connections arrived...how is it possible?
Because some other acceptor member functions and some constructors implicitly call listen(). If you've interested in the implementation details, you can try and step into acceptor implementation and see what happens there exactly.
2)By the following instructions, I create a socket(a connection socket?????or a listening socket???) and then pass it at the acceptor
tcp::socket sock (ioserv); acceptor.accept(sock);
sock is connection socket, acceptor is "listening socket" You can access their native handles (socket handles) by calling native() member function.