QDataStream(自定义数据结构序列化)

class Student{

public:

    QString name;
    int age;
    double score;

    Student(const QString& _name = "", int _age = 0, double _score = 0.0)
        : name(_name)
        , age(_age)
        , score(_score)
    {

    }

    friend QDataStream& operator << (QDataStream& stream, const Student& stu)
    {
        stream<<stu.name<<stu.age<<stu.score;
        return stream;
    }

    friend QDataStream& operator >>(QDataStream& stream, Student& stu)
    {
        stream >> stu.name >> stu.age >> stu.score;
        return stream;
    }

};


void saveStudent(const Student& stu)
{
    QFile file("student.dat");
    file.open(QIODevice::WriteOnly | QIODevice::Append);
    QDataStream ds(&file);
    ds << stu;
    file.close();
}

void readStudent()
{
    QFile file("student.dat");
    file.open(QIODevice::ReadOnly);
    QDataStream ds(&file);
    Student stu;
    while(!ds.atEnd())
    {
        ds >> stu;
        qDebug() << "{" << stu.name << ", " << stu.age << ", " << stu.score << "}";
    }
    file.close();
}


int main(int argc, char **argv)
{
    //LOG_BEG
    QApplication app(argc, argv);
    MainWindow w;
    w.show();
    Student stu1{"Alice", 10, 87.1};
    Student stu2{"Linda", 14, 67.2};
    Student stu3{"Bruce", 13, 57.3};
    saveStudent(stu1);
    saveStudent(stu2);
    saveStudent(stu3);
    readStudent();
    //LOG_END
    return app.exec();
}