#include "mainwindow.h"

 #include <QApplication>

 #include <QFile>

 #include <QDebug>

 int main(int argc, char *argv[])

 {

     QApplication a(argc, argv);

     QFile file("1.bin");

     file.open(QIODevice::WriteOnly|QIODevice::Truncate);

     QDataStream out(&file);

     QString str1 = "hello";

     QChar ch1 = 'A';

     out << str1<<<<ch1;

     file.close();

     file.setFileName("1.bin");

     if(file.open(QFile::ReadOnly))

     {

         QDataStream in(&file);

         QString str;

         int data;

         QChar ch;

         in>>str>>data>>ch;

         qDebug() << str << data << ch;

     }

     MainWindow w;

     w.show();

     return a.exec();

 }