How to convert QVector<QPainterPath> to QByteArray and convert it back?

Christina123

Hi, I am writing a code that can safely serialise a QVector<QPainterPath> to QByteArray and deserialise. I am not sure how to do so but I write some code based on my knowledge on it. Also, I am wondering what is the difference between sending data in terms of QByteArray or QDatastream. Any help is very welcome :)

/*Serialising the data*/
QByteArray Sender::convertPathToByteArray()
{
    QByteArray data = QByteArray::fromRawData(reinterpret_cast<const char*>(path.constData()),sizeof(QPainterPath)*path.size());
    return data;
}

eyllanesc

@Christina123 Use QDataStream:

// QPainterPath to QByteArray
QByteArray ba;
QDataStream ds(&ba, QIODevice::WriteOnly);
ds.setVersion(QDataStream::Qt_5_15);
ds << path;
qDebug() << ba;

// QByteArray to QPainterPath
QPainterPath path;
QDataStream ds(ba);
ds.setVersion(QDataStream::Qt_5_15);
ds >> path;
qDebug() << path;

And knowing that QDataStream supports QVector then in your case the code doesn't change much:

// QVector<QPainterPath> to QByteArray
QByteArray ba;
QDataStream ds(&ba, QIODevice::WriteOnly);
ds.setVersion(QDataStream::Qt_5_15);
ds << paths;
qDebug() << ba;

// QByteArray to QVector<QPainterPath>
QVector<QPainterPath> paths;
QDataStream ds(ba);
ds.setVersion(QDataStream::Qt_5_15);
ds >> paths;
qDebug() << paths;