QT 如何将本地字序转换至网络序列

qint32 Local2Net(qint32 lValue)

{

    qint32          lRetVal = 0;

    QByteArray      tgSource;

    QDataStream     tgStream(&tgSource,QIODevice::ReadWrite);

    tgStream.setByteOrder(QDataStream::BigEndian);

    tgStream<<lValue;

    memcpy(&lRetVal,tgSource.data(),sizeof(long));

    return lRetVal;

}