augustin augustin - 3 months ago 90
C++ Question

How to convert QString to std::string?

I am trying to do something like this:

QString string;
// do things...
std::cout << string << std::endl;


but the code doesn't compile.
How to output the content of qstring into the console (e.g. for debugging purposes or other reasons)? How to convert
QString
to
std::string
?

Answer

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#toAscii

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