How to list large number of files & folders ?

[rawfool]

I'm writing a utility function to list files & folders recursively/non-recursively in a given directory and returning the output as QStringList.

QStringList Utility::dirListing(const QString & path, bool recursive)
{
    QDir dir(path);
    if(!dir.exists())
        return QStringList();
 
    QStringList list;
 
    if(recursive)
    {
        QDirIterator iterator(path, QDirIterator::Subdirectories);
        while(iterator.hasNext())
        {
           list << iterator.next();
        }
    }
    else
    {
        QDirIterator iterator(path, QDirIterator::NoIteratorFlags);
        while(iterator.hasNext())
        {
            list << iterator.next();
        }
    }
    return list;
}

QStringList Utility::dirListing(const QString & path, bool recursive)
{
    QDir dir(path);
    if(!dir.exists())
        return QStringList();

    QStringList list;

    if(recursive)
    {
        QDirIterator iterator(path, QDirIterator::Subdirectories);
        while(iterator.hasNext())
        {
           list << iterator.next();
        }
    }
    else
    {
        QDirIterator iterator(path, QDirIterator::NoIteratorFlags);
        while(iterator.hasNext())
        {
            list << iterator.next();
        }
    }
    return list;
}

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But will this be fine for large data set ?

How can I do this batch wise ?

Kindly give me some hints to handle this case. Thank you.