QString to std::string

Question

I'm trying that sample code and it crashes, in visualc++ 2010

QString fileName = "helloworld";
std::string str = fileName.toStdString();

Solution 1

How to convert QString to std::string?

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.

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();

Solution 2

std::string str(fileName.toStdString()); if you want str to contain a copy of the qstring

Comments

[Martin Beckett]

.toStdString() call toAscii() internally so you don't need to know what qt uses itself

[paulsm4]

@Martin Beckett - thank you, you're correct. ALSO: I forgot to mention the "QtTextCodec" class: doc.qt.nokia.com/4.6/qtextcodec.html