how tell calm windows clipboard iso 8859 utf-8 c++?

i know there an easy proceed detect calm clipboard iso 8859 utf-8 ?

here tide code:

    coledataobject  obj;

    (obj.attachclipboard())
    {
        (obj.isdataavailable(cf_text))
        {
            hglobal hmem = obj.getglobaldata(cf_text);
            cmemfile sf((byte*) ::globallock(hmem),(uint) ::globalsize(hmem));
            cstring buffer;

            lpstr str = buffer.getbuffersetlength((int)::globalsize(hmem));
            sf.read(str,(uint) ::globalsize(hmem));
            ::globalunlock(hmem);

            //this twine class
            s->setencoding(encoding_8bit);
            s->setstring(buffer);
        }
    }
}