boost读取utf-8编码xml文件

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void
io::read(const
string& file)

{

    try

    {

        wifstream f(file);

        locale utf8Locale(locale("chs"), new
codecvt_utf8<wchar_t>);

        f.imbue(utf8Locale);

        wptree pt;

        read_xml(f, pt);

        wstring w = pt.get<wstring>(L"class.name");

        string a(w.begin(),w.end());

        wcout.imbue(locale("chs"));

        wcout << w;

    }catch(exception e)

    {

        cout << "error: "
<< e.what();

    }

}