QString to char conversion

Question

I was trying to convert a QString to char  type by the following methods  but they don t seem to work     QLineEdit  line new QLineEdit    just to describe what is line here   QString temp line- gt text    char  str  char   malloc 10   QByteArray ba temp toLatin1    strcpy str ba data       Can you elaborate the possible flaw with this method  or give an alternative method

User · Answer

the Correct Solution Would be like this     QString k     k    CRAZYYYQT      char ab 16      sprintf ab   s   const char     QByteArray  k toLatin1    data          sprintf ab   s   const char     QByteArray  k toStdString    data           sprintf ab   s   const char   k toStdString   c str          qDebug   lt  lt  --- gt   lt  lt ab lt  lt   lt ---

User · Answer

Qt provides the simplest API const char  qPrintable const QString  amp str  const char  qUtf8Printable const QString  amp str   If you want non-const data pointer use str toLocal8Bit   data   str toUtf8   data

User · Answer

Maybe   my qstring toStdString   c str     or safer  as Federico points out   std  string str   my qstring toStdString    const char  p   str c str      It s far from optimal  but will do the work

User · Answer

Your string may contain non Latin1 characters  which leads to undefined data  It depends of what you mean by  it deosn t seem to work

User · Answer

The easiest way to convert a QString to char  is qPrintable const QString amp  str   which is a macro expanding to str toLocal8Bit   constData

User · Answer

It is a viable way to use std  vector as an intermediate container  QString dataSrc  quot FooBar quot    QString databa   dataSrc toUtf8    std  vector lt char gt  data databa begin    databa end     char  pDataChar   data data

User · Answer

EDITED  this way also works  QString str   Something     char  ch   str toStdString   C str

User · Answer

David s answer works fine if you re only using it for outputting to a file or displaying on the screen  but if a function or library requires a char  for parsing  then this method works best      copy QString to char  QString filename    C  dev file xml   char  cstr  string fname   filename toStdString    cstr   new char  fname size   1   strcpy  cstr  fname c str          function that requires a char  parameter parseXML cstr

User · Answer

Well  the Qt FAQ says   int main int argc  char   argv     QApplication app argc  argv     QString str1    Test     QByteArray ba   str1 toLocal8Bit      const char  c str2   ba data      printf  str2   s   c str2     return app exec        So perhaps you re having other problems  How exactly doesn t this work

User · Answer

If your string contains non-ASCII characters - it s better to do it this way  s toUtf8   data    or s- gt toUtf8   data

[c++] QString to char* conversion

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