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// Copyright Antony Polukhin, 2015-2025.
//
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt
// or copy at http://www.boost.org/LICENSE_1_0.txt)
#include <boost/predef/os.h>
#if BOOST_OS_WINDOWS
//[callplugcpp_tutorial9
#include <boost/dll/import.hpp> // for dll::import
#include <boost/dll/shared_library.hpp> // for dll::shared_library
#include <functional>
#include <iostream>
#include <windows.h>
namespace dll = boost::dll;
int main() {
typedef HANDLE(__stdcall GetStdHandle_t)(DWORD ); // function signature with calling convention
// OPTION #0, requires C++11 compatible compiler that understands GetStdHandle_t signature.
auto get_std_handle = dll::import_symbol<GetStdHandle_t>(
"Kernel32.dll",
"GetStdHandle",
boost::dll::load_mode::search_system_folders
);
std::cout << "0.0 GetStdHandle() returned " << get_std_handle(STD_OUTPUT_HANDLE) << std::endl;
// You may put the `get_std_handle` into std::function<>. But std::function<Signature> may not compile with
// Signature template parameter that contains calling conventions, so you'll have to remove the calling convention.
std::function<HANDLE(DWORD)> get_std_handle2 = get_std_handle;
std::cout << "0.1 GetStdHandle() returned " << get_std_handle2(STD_OUTPUT_HANDLE) << std::endl;
// OPTION #1, hand write the import.
dll::shared_library lib("Kernel32.dll", dll::load_mode::search_system_folders);
GetStdHandle_t& func = lib.get<GetStdHandle_t>("GetStdHandle");
// Here `func` does not keep a reference to `lib`, you'll have to deal with that on your own.
std::cout << "1.0 GetStdHandle() returned " << func(STD_OUTPUT_HANDLE) << std::endl;
return 0;
}
//]
#else // BOOST_WINDOWS
#include <boost/dll/shared_library.hpp> // for dll::shared_library
int main() {
return 0;
}
#endif // BOOST_WINDOWS
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