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struct my_struct
{
    int a;
    int b;
};

QMap<QString, my_struct> mapMain;

   QByteArray arr;
    QDataStream stream(&arr, QIODevice::WriteOnly);
    stream.setVersion(QDataStream::Qt_4_7);

    my_struct udt;

    udt.a = 1;
    udt.b = 2;

    mapMain.insert("Hello", udt);

    stream << mapMain;

C:\dev\est_strucrt-build-desktop\..\..\Qt\2010.05\qt\src\corelib\io\qdatastream.h:427: ошибка: no match for 'operator<<' in 'operator<<(((QDataStream&)((QDataStream*)out)), ((const QString&)((const QString*)it.QMap<Key, T>::const_iterator::key [with Key = QString, T = my_struct]()))) << it.QMap<Key, T>::const_iterator::value [with Key = QString, T = my_struct]()'

  friend QDataStream &operator<<(QDataStream &out, const QMap<QString, my_struct> &map)
    {
        //Тут код :)
        return out;
    }

 friend QDataStream &operator<<(QDataStream &out, const QMap<QString, my_struct> &map)
    {

        QMapIterator<QString, my_struct> iter(map);
        while(iter.hasNext())
        {
            iter.next();
            out << iter.key();
            out << iter.value().a;
            out << iter.value().b;
        }
        return out;
    }

template <class Key, class T>
Q_OUTOFLINE_TEMPLATE QDataStream &operator<<(QDataStream &out, const QMap<Key, T> &map)
{
    out << quint32(map.size());
    typename QMap<Key, T>::ConstIterator it = map.end();
    typename QMap<Key, T>::ConstIterator begin = map.begin();
    while (it != begin) {
        --it;
        out << it.key() << it.value();
    }
    return out;
}

QByteArray arr;
QDataStream stream(&arr, QIODevice::WriteOnly);
stream.setVersion(QDataStream::Qt_4_7);

QMapIterator<QString, my_struct> iter(mapMain);
        while(iter.hasNext())
        {
            iter.next();

            stream << iter.key();
            stream << iter.value();
        }