21.QT二进制文件

 #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();
 }