Save (already-existing) QSetting into an INI file

Question

I want to save an alredy-existing QSettings object into some INI file for backup.

The QSettings comes from the application's global settings, ie. it can be registry, ini file, etc.

---

In case it helps, my context is:

class Params
{
    // All params as data members
    // ...
    void loadGlobal ()
    {
        Qettings s; // Global parameters, paths set by application
        // Fill data members: s.value (...);
    }
};

class Algo
{
    Result run (Params p)
    {
        Result r = F(p);
        return r;
    }
};

int main (...)
{
    Params p;
    p.loadGlobal ();
    Algo a;
    Result r = a.run (p);

    // At this point, save Result and Params into a specific directory
    // Is there a way to do:
    p.saveToIni ("myparams.ini"); // <-- WRONG
}

---

A solution would be to add a saveTo (QSetting & s) method into the Params class:

class Params
{
    void saveTo (QSettings & s)
    {
        s.setValue (...);
    }
};

int main (...)
{
    Params p;
    p.loadGlobal ();
    QSettings bak ("myparams.ini", ...);
    p.saveTo (bak);
}

But I am looking for a solution without modifying the Params class.

Answer 1

Well, no, QT Doesn't really support this directly. I think your best bet is writing a helper class...something like:

void copySettings( QSettings &dst, QSettings &src )
{
    QStringList keys = src.allKeys();
    for( QStringList::iterator i = keys.begin(); i != keys.end(); i++ )
    {
        dst.setValue( *i, src.value( *i ) );
    }
}