um/service/src/windows_error.cpp


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// Copyright (c) 2015 Egor Tensin <Egor.Tensin@gmail.com>
// This file is part of the "Windows 7 drivers" project.
// For details, see https://github.com/egor-tensin/windows7-drivers.
// Distributed under the MIT License.

#include "service/all.hpp"

#include <Windows.h>

#include <string>

namespace service
{
    namespace windows_error
    {
        std::string Category::message(int code) const
        {
            char* buf_ptr;

            const auto nbwritten = FormatMessageA(
                FORMAT_MESSAGE_ALLOCATE_BUFFER
                    | FORMAT_MESSAGE_FROM_SYSTEM
                    | FORMAT_MESSAGE_IGNORE_INSERTS,
                NULL,
                code,
                MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
                reinterpret_cast<char*>(&buf_ptr),
                0,
                NULL);

            if (0 == nbwritten)
            {
                LocalFree(buf_ptr);
                return "Couldn't format the error message";
            }

            std::string str(buf_ptr, nbwritten - 2);
            LocalFree(buf_ptr);
            return str;
        }
    }
}