You can use:
QString qs;
// do things
std::cout << qs.toStdString() << std::endl;
It internally uses QString::toUtf8() function to create std::string, so it's Unicode safe as well. Here's reference documentation for QString
.
One of the things you should remember when converting QString
to std::string
is the fact that QString
is UTF-16 encoded while std::string
... May have any encodings.
So the best would be either:
QString qs;
// Either this if you use UTF-8 anywhere
std::string utf8_text = qs.toUtf8().constData();
// or this if you're on Windows :-)
std::string current_locale_text = qs.toLocal8Bit().constData();
The suggested (accepted) method may work if you specify codec.
See: http://doc.qt.io/qt-5/qstring.html#toLatin1
If your ultimate aim is to get debugging messages to the console, you can use qDebug().
You can use like,
qDebug()<<string;
which will print the contents to the console.
This way is better than converting it into std::string
just for the sake of debugging messages.
QString qstr;
std::string str = qstr.toStdString();
However, if you're using Qt:
QTextStream out(stdout);
out << qstr;
Best thing to do would be to overload operator<< yourself, so that QString can be passed as a type to any library expecting an output-able type.
std::ostream& operator<<(std::ostream& str, const QString& string) {
return str << string.toStdString();
}
An alternative to the proposed:
QString qs;
std::string current_locale_text = qs.toLocal8Bit().constData();
could be:
QString qs;
std::string current_locale_text = qPrintable(qs);
See qPrintable documentation, a macro delivering a const char * from QtGlobal.
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