FATAL ERROR "WinSocket.h" already included

[FabrizioDys]

Hi!

I'm trying to use the HTTP request methods provided by this page:

I am actually implementing this to an already done project ( MEPP2 ) that uses graph and iterator components, I generated through CMake the dependencies with the boost library, and I'm "forced" to use version 1.67. The problem I have when I include `#include <boost/beast/core.hpp>

include <boost/beast/http.hpp>

include <boost/beast/version.hpp>

include <boost/asio/connect.hpp>

include <boost/asio/ip/tcp.hpp>`

these ones is "Fatal Error: Winsocket.h" already included. Can anyone help me out? I can send some more informations if needed. Thank you :)

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[madmongo1]

Hi @FabrizioDys ,

Are you able to share with me a compilation unit which exhibits the problem, perhaps by a gist or by sharing a link to github or godbolt?

R

[vinniefalco]

https://stackoverflow.com/questions/9750344/boostasio-winsock-and-winsock-2-compatibility-issue

[FabrizioDys]

Hi @madmongo1 , HERE is the link for MEPP2, I'm a student who's collaborating with one of the developers so the product was already as you see it. The thing that I am doing now is to add another piece of code ( a filter ) for retrieving a file from internet, so, since they were already using Boost libraries, I thought I could use the asio and beast components to achieve the result. The program is kind of complicated so, following @vinniefalco 's suggestion I am still trying to find where "#include " is to understand how to resolve this conflict. Do you think it's possible to edit this part of code? From "socket_types.hpp"

if defined(WINSOCKAPI) && !defined(WINSOCK2API)

error WinSock.h has already been included

endif // defined(WINSOCKAPI) && !defined(WINSOCK2API)

[madmongo1]

Ho @FabrizioDys ,

I think a better strategy would be to ensure that #include <boost/asio.hpp> is the first include in any compilation unit that needs it.

If you've created a project from scratch in Visual Studio, you might find that the precompiled header file StdAfx.h includes winsock?

[FabrizioDys]

Hi again.

I looked through the entire solution and there is no "windows.h" included, nor "StdAfx.h", I followed one of the answers of the stackoverflow page @vinniefalco linked me:

instead of including the boost headers I needed I wrote something like this:

ifdef _WIN32

ifdef USE_ASIO

// Set the proper SDK version before including boost/Asio

include

// Note boost/ASIO includes Windows.h.

include <boost/asio.hpp>

include <boost/beast/core.hpp>

include <boost/beast/http.hpp>

include <boost/beast/version.hpp>

include <boost/asio/connect.hpp>

include <boost/asio/ip/tcp.hpp>

else // USE_ASIO

include

endif // USE_ASIO

else // _WIN32

ifdef USE_ASIO

include <boost/asio.hpp>

include <boost/beast/core.hpp>

include <boost/beast/http.hpp>

include <boost/beast/version.hpp>

include <boost/asio/connect.hpp>

include <boost/asio/ip/tcp.hpp>

endif // USE_ASIO

endif //_WIN32

and the error concerning the "WinSock.h" disappeared. Then I tried to do something like this:

using tcp = boost::asio::ip::tcp; namespace http = boost::beast::http;

and I had the following errors:

asio: not a member of boost ip: not a member of boost asio: the symbol on the left of '::' must be a type

and going on for tcp, beast and http too. Do you have any idea what's happening?

[madmongo1]

It’s difficult to say without having code available to reproduce the problem.

Can you share a minimal project with me on github or godbolt that reproduces the problem?

[MasterBe]

This is still a problem for me

[ashtum]

This is still a problem for me

Could you please provide a minimal reproducible example?

[jjYBdx4IL]

#define WIN32_LEAN_AND_MEAN before windows.h include solves the issue for me, which probably isn't optimal.