[gtkmm] How can I dump a UTF8 text file into Glib::ustring ?

[Brian =?big5?b?SHN1?= (=?big5?b?pWq507xDpVA=?=) <brianhsu bone twbbs org tw>]

Hello everyone,

I'm trying to write a simple template library using Glib::ustring in order to handle
unicode files and strings.

But now I have a problem that deal with Glib::ustring and file I/O,
I can't read a UTF8 text file into a Glib::ustring.

I'v tried read file using standard C++ I/O library , dump the file
character by character to the std::string. But when I assign this
std::string to Glib::ustring , it will crash even the file only have
ascii charset in it.

I'v also tried using code that present in example/markup/parser.cc :

void file_get_contents(const std::string& filename, Glib::ustring& contents)
{
    const Glib::RefPtr<Glib::IOChannel> channel = Glib::IOChannel::create_from_file(filename, "r");
    channel->read_to_end(contents);
}

It work prefectly when the file only contain ascii character ,
but if the file have something other than ascii ( like Chinese/Japanese in UTF8 ) ,
it will crash.

Would any one like to tell me how to read hole UTF8 text file into Glib::ustring?

Sorry for my poor English,
Brian Hsu.

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