65 lines
2.4 KiB
C++
65 lines
2.4 KiB
C++
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// Copyright 2014 Renato Tegon Forti, Antony Polukhin.
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// Copyright Antony Polukhin, 2015-2022.
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//
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// Distributed under the Boost Software License, Version 1.0.
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// (See accompanying file LICENSE_1_0.txt
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// or copy at http://www.boost.org/LICENSE_1_0.txt)
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#ifndef BOOST_DLL_DETAIL_WINDOWS_PATH_FROM_HANDLE_HPP
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#define BOOST_DLL_DETAIL_WINDOWS_PATH_FROM_HANDLE_HPP
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#include <boost/dll/config.hpp>
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#include <boost/dll/detail/system_error.hpp>
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#include <boost/winapi/dll.hpp>
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#include <boost/winapi/get_last_error.hpp>
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#ifdef BOOST_HAS_PRAGMA_ONCE
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# pragma once
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#endif
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namespace boost { namespace dll { namespace detail {
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inline boost::dll::fs::error_code last_error_code() BOOST_NOEXCEPT {
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boost::winapi::DWORD_ err = boost::winapi::GetLastError();
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return boost::dll::fs::error_code(
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static_cast<int>(err),
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boost::dll::fs::system_category()
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);
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}
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inline boost::dll::fs::path path_from_handle(boost::winapi::HMODULE_ handle, boost::dll::fs::error_code &ec) {
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BOOST_STATIC_CONSTANT(boost::winapi::DWORD_, ERROR_INSUFFICIENT_BUFFER_ = 0x7A);
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BOOST_STATIC_CONSTANT(boost::winapi::DWORD_, DEFAULT_PATH_SIZE_ = 260);
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// On success, GetModuleFileNameW() doesn't reset last error to ERROR_SUCCESS. Resetting it manually.
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boost::winapi::GetLastError();
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// If `handle` parameter is NULL, GetModuleFileName retrieves the path of the
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// executable file of the current process.
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boost::winapi::WCHAR_ path_hldr[DEFAULT_PATH_SIZE_];
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boost::winapi::GetModuleFileNameW(handle, path_hldr, DEFAULT_PATH_SIZE_);
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ec = boost::dll::detail::last_error_code();
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if (!ec) {
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return boost::dll::fs::path(path_hldr);
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}
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for (unsigned i = 2; i < 1025 && static_cast<boost::winapi::DWORD_>(ec.value()) == ERROR_INSUFFICIENT_BUFFER_; i *= 2) {
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std::wstring p(DEFAULT_PATH_SIZE_ * i, L'\0');
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const std::size_t size = boost::winapi::GetModuleFileNameW(handle, &p[0], DEFAULT_PATH_SIZE_ * i);
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ec = boost::dll::detail::last_error_code();
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if (!ec) {
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p.resize(size);
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return boost::dll::fs::path(p);
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}
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}
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// Error other than ERROR_INSUFFICIENT_BUFFER_ occurred or failed to allocate buffer big enough.
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return boost::dll::fs::path();
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}
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}}} // namespace boost::dll::detail
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#endif // BOOST_DLL_DETAIL_WINDOWS_PATH_FROM_HANDLE_HPP
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