winuser.hpp

// Copyright Take Vos 2023.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at https://www.boost.org/LICENSE_1_0.txt)
 
#pragma once
 
#include "../win32_headers.hpp"
#include "../macros.hpp"
#include "win32_error_intf.hpp"
#include <expected>
#include <string>
#include <string_view>
#include <system_error>
 
hi_export_module(hikogui.win32 : winuser);
 
namespace hi { inline namespace v1 {
 
inline std::expected<UINT, win32_error> win32_MessageBox(HWND handle, std::string_view text, std::string_view caption, UINT type) noexcept
{
    auto const wtext = win32_MultiByteToWideChar(text);
    if (not wtext) {
        return std::unexpected{wtext.error()};
    }
 
    auto const wcaption = win32_MultiByteToWideChar(caption);
    if (not wcaption) {
        return std::unexpected{wcaption.error()};
    }
 
    auto const r = MessageBoxW(handle, wtext->c_str(), wcaption->c_str(), type);
    if (r == 0) {
        return std::unexpected{win32_GetLastError()};
    }
 
    return r;
}
 
}}