you might want to add definition for you own data type:
QDataStream &operator<<(QDataStream &out, const MyCustomType &var);
QDataStream &operator>>(QDataStream &in, MyCustomType &var);
This should be enough to make this work. You probably will have to serialize
the mode as int and the x/y/z as qreal value
out << (int)var.mode() << var.reading().x() << var.reading().y() <<
var.reading().z();
and do the inverse when reading into local var, then call the proper
constuctor/setter
qreal x, y, z;
int mode;
in >> mode >> x >> y >> z;
var.setAccelerationMode(mode);
var.reading().setX(x);
var.reading().setY(y);
var.reading().setZ(z);
________________________________
From: Interest <interest-bounces+godboutj=amotus...@qt-project.org> on behalf
of Jason H <jh...@gmx.com>
Sent: Wednesday, February 21, 2018 1:05:35 AM
To: interestqt-project.org
Subject: [Interest] Serializing QSensorReading derived classes
I'd like to serialize these values.
QAcceleromterReading has x,y,z properties, but to serialize this one, the
accelerometer mode should also be included.
But aside from that, I'm not clear on what I need to do. There's adding the
QDataStream << >> (QDataScream stream, QSensorReading reading) operators. But
that won't allow me to know what I'm reading, so I need to add a byte to know
what I'm deserializing, which means I should really do it via QVariant in the
QMetaType system.
qRegisterMetaType() and DECLARE_META_TYPE(). However, when I do this I get:
qmetatype.h:766: error: call to implicitly-deleted copy constructor of
'QAltimeterReading'
return new (where) T(*static_cast<const T*>(t));
^ ~~~~~~~~~~~~~~~~~~~~~~~~~
for each of the types.
What can I do to get this to work without having to write (derive) my own
classes?
I'm also wondering why this isn't supported already?
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http://lists.qt-project.org/mailman/listinfo/interest
