How to convert QString to std string

Question

I am trying to do something like this   QString string     do things    std  cout  lt  lt  string  lt  lt  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

User · Answer

Try this    include  lt QDebug gt  QString string     do things    qDebug    lt  lt   right   lt  lt  string  lt  lt  std  endl

User · Answer

The simplest way would be QString  toStdString

User · Answer

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

User · Answer

You can use   QString qs     do things std  cout  lt  lt  qs toStdString    lt  lt  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

User · Answer

Best thing to do would be to overload operator lt  lt  yourself  so that QString can be passed as a type to any library expecting an output-able type   std  ostream amp  operator lt  lt  std  ostream amp  str  const QString amp  string        return str  lt  lt  string toStdString

User · Answer

QString data     data toStdString   c str      could even throw exception on VS2017 compiler in xstring    basic string    NOEXCEPT                destroy the string          Tidy deallocate                the right way   secure - no exception  is how is explained above from Artyom   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

User · Answer

You can use this   QString data  data toStdString   c str

User · 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 toLatin1

User · Answer

QString qstr  std  string str   qstr toStdString      However  if you re using Qt   QTextStream out stdout   out  lt  lt  qstr

User · Answer

If your ultimate aim is to get debugging messages to the console  you can use qDebug     You can use like   qDebug   lt  lt 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

[c++] How to convert QString to std::string?

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