serialization

[Ivan Filko]

hello everyone, I have no experience in serialization. I have a problem like:
This is my
struct plane
{
int id;
int size_az;
int size_dal;

 int amplityda;
 double speed;
 QList <int> k_x, k_y;
 QList <int> k_az, k_dal;

};

and
QList <plane> all_plane;

I need to serializ and deserializ all_plane, use the file.
Please help me.
I need an example step by step.

[[merged all serialization threads, Tobias]]

[bjanuario]

Hi, hope this can help you ...

@#include <QtCore>
#include <QApplication>
#include <QHash>
#include <QFile>
#include <QDataStream>

#define PATH "./file.dat"

int main()
{

//create a dictionary
QHash<QString,QString> dict;
dict["project.owner"] = “owner”;
dict["project.version"] = “0.10.0″;

QFile file&#40;PATH&#41;;
file.open(QIODevice::WriteOnly);
QDataStream out(&file);   // write the data
out << dict;
file.close();

//setting new a value
dict["project.owner"] = “new”;

//update the dictionary
file.open(QIODevice::ReadOnly);
QDataStream in(&file);   // read the data serialized from the file
in >> dict;

qDebug() << “value: ” << dict.value(”project.owner”);
return 0;

}@

[SGaist]

Hi,

Please use coding tags with your code, without it's difficult to read it.

You can achieve this by implementing QTextStream or QDataStream for both your struct plane and your QList<plane>

[8majkel8]

QDataStream has automatic serizalization of base types.

Create custom write and read operators.

@
QDataStream & operator << (QDataStream & out, const plane & obj)
{
out << obj.id << obj.size_az << ...

out << obj.k_x.size();
foreach (int v in k_x) {
   out << obj.k_x.v;
}

...

return out;

}
@

@
QDataStream & operator>>(QDataStream & in, plane & obj)
{
out >> obj.id;
out >> obj.size_az
out >> ...

int cnt; out >> cnt;
for (; cnt > 0; cnt--) {
   int v; out >> v;
   obj.k_x.push_back(v);
}

...

return in;

}
@

Example usage.

@QFile file("file.dat");
file.open(QIODevice::ReadWrite);
QDataStream out(&file);

plane thePlane;
out << thePlane; //to write
out >> thePlane; //to read
@

[qxoz]

Добрый день Ivan Filko.
На форуме лучше не дублировать посты, к какому бы разделу они не относились видны для всех одинаково.