QDataStream serialization/deserializatin of QVector Struct example :

RahibeMeryem

Hi,

I need an example for the below struct vector serialzation/deserialzation from / to File:

struct  q_person_struct {

    QVector<float> q_f_desc;
    QString name;
    QImage image;

};

QVector<q_person_struct> person;

Then there will be almost 10.000 person in the person QVector.

I tried from tutorials but some point I lost the direction.

I will be appreciated if you provide help, and could be helpfull for the other newbies.

Best

thanks

Maria

ofmrew

Try this:

class MyClass
{
public:
    explicit MyClass();
    MyClass(QRectF r, QLineF l);


    QRectF br;
    QLineF ln;

signals:

public slots:
};
QDataStream &operator <<(QDataStream &out, const MyClass &mc);
QDataStream &operator >>(QDataStream &in, MyClass &mc);

MyClass::MyClass() {}
MyClass::MyClass(QRectF r, QLineF l) : br{r}, ln{l}
{

}

QDataStream &operator <<(QDataStream &out, const MyClass &mc){
    out << mc.br << mc.ln;
    return out;

}
QDataStream &operator >>(QDataStream &in, MyClass &mc){
    in >> mc.br >> mc.ln;
    return in;
}
class MyCanvas : public QWidget
{
    Q_OBJECT
public:
    explicit MyCanvas(QWidget *parent = nullptr);

    void create();
    void store();
    void load();

    QVector<MyClass> cell;
    QVector<MyClass> cell2;
    QDataStream stream;

signals:

public slots:
};
void MyCanvas::create()
{
    MyClass line1(QRectF(50.0, 50.0, 200.0, 200.0), QLineF(50.0, 50.0, 250.0, 250.0));
    cell.append(line1);
    MyClass line2(QRectF(250.0, 50.0, 200.0, 200.0), QLineF(250.0, 250.0, 500.0, 50.0));
    cell.append(line2);
}

void MyCanvas::store()
{
    QFile file("test1.dat");
    file.open(QIODevice::WriteOnly);
    QDataStream out(&file);
    out << cell;
}

void MyCanvas::load()
{
    QFile file("test1.dat");
    file.open(QIODevice::ReadOnly);
    QDataStream in(&file);
    in >> cell2;
}