Function utf8_to_windows

libraries/lib-polymer/src/util-win32.cpp:20–28

#pragma comment(lib, "Shlwapi.lib")

std::wstring utf8_to_windows(const std::string & str)
{
    if (!str.size()) return {};
    auto l = ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, str.data(), static_cast<int>(str.size()), nullptr, 0);
    if (l == 0) throw std::invalid_argument("string cannot be converted to utf8: " + str);
    std::wstring win(l, ' ');
    ::MultiByteToWideChar(CP_UTF8, MB_ERR_INVALID_CHARS, str.data(), static_cast<int>(str.size()), &win[0], static_cast<int>(win.size()));
    return win;
}

// Adapted from https://github.com/sgorsten/editor/blob/master/src/editor/xplat.h
std::string windows_file_dialog(const std::string & filter_type, const std::string & extension, bool must_exist)