source: branches/4.5.1/doc/src/snippets/streaming/main.cpp

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#include <QtGui>
#include <QByteArray>
#include <QDataStream>

//! [0]
struct Movie
{
    int id;
    QString title;
    QDate releaseDate;
};
//! [0]

//! [1]
QDataStream &operator<<(QDataStream &out, const Movie &movie)
{
    out << (quint32)movie.id << movie.title
        << movie.releaseDate;
    return out;
}
//! [1]

//! [2]
QDataStream &operator>>(QDataStream &in, Movie &movie)
{
    quint32 id;
    QDate date;

    in >> id >> movie.title >> date;
    movie.id = (int)id;
    movie.releaseDate = date;
    return in;
}
//! [2]

int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    Movie m;
    m.id = 0001;
    m.title = "Happy Meal";
    m.releaseDate = QDate(1995, 5, 17);

    QByteArray byteArray;
    QDataStream stream(&byteArray, QIODevice::WriteOnly);
    stream << m;
    
    // display
    qDebug() << m.id << m.releaseDate << m.title;

    Movie m2;
    
    int id2;
    QString title2;
    QDate date2;

    QDataStream stream2(byteArray);
    stream2 >> id2 >> title2 >> date2;

    m2.id = id2;
    m2.title = title2;
    m2.releaseDate = date2;

    qDebug() << id2 << " " << date2 << " " << title2;

    return 0;
}