Yes, the correct type to pass to Glib::locale_to_utf8() is a
std::string, rather than Glib::ustring which expects its contents to
already be valid UTF-8 bytes, something that locale-encoded characters
outside of 7-bit ASCII are not.
Also worth noting, you'll find that if your program uses Gtk, that once
that has been initialized (by constructing a Gtk::Main), the locale
stuff will be set up automatically - and not just setlocale(), also
things like textdomain(), which helps if your program has translatable
strings (marked with _("...") ). Letting Gtk do it also helps hide
platform differences (Windows' setlocale() for example works slightly
differently.)
Hope that helps.
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