QDataStream and pointer

[stevocz]

Hi. how can i send data over QDataStream?

a try this:

QByteArray test;
QtMobility::QGeoMapGroupObject *points = AddToMap();
QDataStream ds(&test, QIODevice::WriteOnly);
ds << points;

but reading not woks

QByteArray packet ....
QtMobility::QGeoMapGroupObject *points = new QtMobility::QGeoMapGroupObject();
QDataStream ds(&packet, QIODevice::ReadOnly);
ds >> points;


i have this error:

error: no match for 'operator>>' in 'ds >> points'

[anda_skoa]

A pointer just points (hence the name) to the actual data.

If this is a pointer to a list and the list has operators for QDataStream than you can derefernce before streaming.
Otherwise iterate over whatever this is (an array?) and stream each element.
You might want to first stream the length, so you can allocate the necessary structures before reading.

Cheers,
_

[stevocz]

can you write me example how can i send this data?

[anda_skoa]

Well, the QGeoMapGroupObject is a QObject derived class, so it can't be easily serialized.

What exactly is your goal?

Cheers,
_

[stevocz]

in QtMobility::QGeoMapGroupObject i have some routes, pixmap and other things which i can add to map. but this is in plugin. And map is in mainwindow where is connected this plugin. I must send this created QtMobility::QGeoMapGroupObject into mainwindow for adding to map.

[anda_skoa]

Ah, within the same process.
You don't need to serialize for that.

The plugin host API could have a method that the plugin can call with the pointer or the plugin could emit the object via signal.

Cheers,
_