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    QVariant var;

    var = qVariantFromValue(reg); // reg - моя структура

    QByteArray result;

    QDataStream stream(&result, QIODevice::WriteOnly);
    stream.setVersion(QDataStream::Qt_4_3);
    stream << var;

    sock->write(block); // QTcpSocket* sock;

    QVariant var;
    QTcpSocket *client = (QTcpSocket*)sender();
    QDataStream clientStream(client);

    clientStream >> var;