Re: [Boost-users] Boost.Asio, 0MQ, and Windows

Subject: Re: [Boost-users] Boost.Asio, 0MQ, and Windows
From: Bjorn Reese (breese_at_[hidden])
Date: 2013-08-10 06:51:59

On 08/09/2013 08:34 PM, Damien Kick wrote:

>      zocket.getsockopt(ZMQ_FD, &zfd, &zfd_size);
>      boost::asio::io_service ios;
>      boost::asio::windows::stream_handle io(ios, zfd);
>
> And the error I get when I try to compile it.
>
>      2>Z:\zee-zmq-socket.cpp(14): error C2664: \
>        'boost::asio::windows::basic_stream_handle<>::basic_stream_handle(\
>        boost::asio::io_service &,void *const &)' : cannot convert parameter \
>        2 from 'SOCKET' to 'void *const &'
>      2>          Reason: cannot convert from 'SOCKET' to 'void *const '
>      2>          Conversion from integral type to pointer type requires \
>        reinterpret_cast, C-style cast or function-style cast

Boost.Asio uses native_handle_type, which is a wrapper class for the
underlying socket type. In the case of Windows this is SOCKET. However,
you probably need to go via a intermediary variable:

    boost::asio::windows::stream_handle::native_handle_type handle(zfd);
    boost::asio::windows::stream_handle io(ios, handle);

Disclaimer: I have not compiled it. You may need to include something
from detail to make it work, or it may not work at all ;-)

> And so I'm worried there might be other gotchas about which I might
> not know and which would not even be so polite as to manifest
> themselves as compile-time errors.  Thank you in advance for any help.

Make sure to use null_buffers:

http://www.boost.org/doc/html/boost_asio/overview/core/reactor.html