И снова кодировка

    wxTreeItemId root = TreeCtrl1->GetRootItem();
    Json::Value JSONval;
    Json::Reader reader;
    std::ifstream file("data_load.json");
    reader.parse(file, JSONval);
 
    Json::Value places = JSONval["places"];
    for (Json::ValueIterator i=places.begin(); i!=places.end(); ++i){
        TreeCtrl1->AppendItem(root, ((*i)["place"].asString()));
    }

    wxTreeItemId root = TreeCtrl1->GetRootItem();
    Json::Value JSONdb;
    JSONdb["places"] = getChildKnot(root, TreeCtrl1); //заполняю json
    Json::StyledWriter wrtr;
    std::string str = wrtr.write(JSONdb);
    std::ofstream fl("data.json");
    if(fl.is_open()){
        fl<<str;
        fl.close();
    }

JSONdb["places"] = getChildKnot(root, TreeCtrl1); //заполняю json

//...
   TreeCtrl1->AppendItem(root, wxString::FromUTF8(((*i)["place"].asString())));
//...

const wxScopedCharBuffer    utf8_str () const
const std::string   utf8_string () const

Json::Value getChildKnot(wxTreeItemId root, wxTreeCtrl* tree){
    Json::Value result;
    result["name"] = std::string(tree->GetItemText(root));
     ........................
    return result;
}

result["name"] = tree->GetItemText(root).utf8_string();

const Rational operator*(const Rational& lhs, const Rational& rhs);
 
Rational a, b, c;
 
(a * b) = c;
if (a * b = c) ...