1 // Copyright 2015-2019 Antony Polukhin. 2 // 3 // Distributed under the Boost Software License, Version 1.0. 4 // (See accompanying file LICENSE_1_0.txt 5 // or copy at http://www.boost.org/LICENSE_1_0.txt) 6 7 #include <boost/predef/os.h> 8 #if BOOST_OS_WINDOWS 9 10 //[callplugcpp_tutorial9 11 #include <boost/dll/import.hpp> // for dll::import 12 #include <boost/dll/shared_library.hpp> // for dll::shared_library 13 #include <boost/function.hpp> 14 #include <iostream> 15 #include <windows.h> 16 17 namespace dll = boost::dll; 18 main()19int main() { 20 typedef HANDLE(__stdcall GetStdHandle_t)(DWORD ); // function signature with calling convention 21 22 // OPTION #0, requires C++11 compatible compiler that understands GetStdHandle_t signature. 23 /*<-*/ 24 #if defined(_MSC_VER) && !defined(BOOST_NO_CXX11_TRAILING_RESULT_TYPES) && !defined(BOOST_NO_CXX11_DECLTYPE) && !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) /*->*/ 25 auto get_std_handle = dll::import<GetStdHandle_t>( 26 "Kernel32.dll", 27 "GetStdHandle", 28 boost::dll::load_mode::search_system_folders 29 ); 30 std::cout << "0.0 GetStdHandle() returned " << get_std_handle(STD_OUTPUT_HANDLE) << std::endl; 31 32 // You may put the `get_std_handle` into boost::function<>. But boost::function<Signature> can not compile with 33 // Signature template parameter that contains calling conventions, so you'll have to remove the calling convention. 34 boost::function<HANDLE(DWORD)> get_std_handle2 = get_std_handle; 35 std::cout << "0.1 GetStdHandle() returned " << get_std_handle2(STD_OUTPUT_HANDLE) << std::endl; 36 /*<-*/ 37 #endif /*->*/ 38 39 // OPTION #1, does not require C++11. But without C++11 dll::import<> can not handle calling conventions, 40 // so you'll need to hand write the import. 41 dll::shared_library lib("Kernel32.dll", dll::load_mode::search_system_folders); 42 GetStdHandle_t& func = lib.get<GetStdHandle_t>("GetStdHandle"); 43 44 // Here `func` does not keep a reference to `lib`, you'll have to deal with that on your own. 45 std::cout << "1.0 GetStdHandle() returned " << func(STD_OUTPUT_HANDLE) << std::endl; 46 47 return 0; 48 } 49 50 //] 51 52 #else // BOOST_WINDOWS 53 54 #include <boost/dll/shared_library.hpp> // for dll::shared_library 55 main()56int main() { 57 return 0; 58 } 59 60 #endif // BOOST_WINDOWS 61