Qt error：'const class QString'has no member named'toStdString'

Question

我得到這個錯誤error: 'const class QString' has no member named 'toStdString'雖然QString有它。 (link)。

代碼

std::string Message::toStdString() const 
    { 
     return m_string.toStdString(); 
    } 

Answer 1

答案從這裏直接複製：

How to convert QString to std::string?

QString qs; 

// Either this if you use UTF-8 anywhere 
std::string utf8_text = qs.toUtf8().constData(); 

// or this if you on Windows :-) 
std::string current_locale_text = qs.toLocal8Bit().constData();