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.