hi ,

My problem is , How to get std::string object from a QString in Qt 3

What i did :-
1) I have a binary/text file.
2) I stored the data in QByteArray
3) I created a QString from QByteArray

What am trying to achieve :-
1) I am trying to create a std::string object( for seding the object to an ENCRPTIONFUNCTION ) from QString
2) In Qt 4.2.2 am able to get a std::string from QString.
But how can i make it work in Qt3.

See the code below ( in Qt 4) . Please help me to work the same in Qt3..

Qt Code: 
  1. #include <QMessageBox>
  2. #include <QIODevice>
  3. #include <QFile>
  4. #include <QByteArray>
  5. #include <QString>
  6. #include <QtDebug>
  7.  
  8.  
  9. //FOR standard C++ libraries.
  10. #include <ios>
  11. #include <iostream>
  12. #include <string>
  13. using namespace std;
  14.  
  15. int main(int argc, char *argv[])
  16. {
  17.     QByteArray byteArray;   
  18.     QFile f ( "m1_enc.ct" );		//binary file encoded using CBC Mode.
  19. 	//QFile f ( "m1.ct" );			//Text file 
  20. 	//QFile f ( "Feb.ct");			//Text file 
  21.  
  22.     if ( f.open ( QIODevice::ReadOnly ) )
  23.           {  
  24.               // file opened successfully  
  25.               byteArray = f.readAll();
  26.           }
  27.     else
  28.     {
  29.         // problems opening the file - emit a warning message
  30.         QMessageBox::warning( 0, QObject::tr("error"),
  31.             QObject::tr("Error opening file %1") ) ;       
  32.         return -1;
  33.     }
  34.     f.close();
  35. 	Q_ASSERT( ! byteArray.isEmpty() );
  36.  
  37. 	//CASE_1
  38. 	qDebug() << "QString from Binary_Data( QByteArray )    \n\n"  << QString(byteArray) ;   
  39.  
  40. 	//CASE_2
  41. 	qDebug() << "Binary_Data(QByteArray) from QString      \n\n"  << QString(byteArray).toLatin1();
  42.  
  43.  
  44. 	//CASE_3	 
  45. 	string str = QString(byteArray).toStdString() ;
  46.  
  47.    // string strFromQString( str );           		
  48.    qDebug() << "String from QString					   \n\n"  <<  str.data();
  49.  
  50.  
  51.     return 0;
  52.  
  53. }
To copy to clipboard, switch view to plain text mode 

thanks in advance.