How to receive python QVariant(data_dict(..)) from Qt c++ QDatastream QVariantMap?

RahibeMeryem

Hi,

I am creating QVariantMap in python and sending to mqtt:

data = {'mq_username': QVariant('123'),  'np_database': QVariant('png') ,  'category': QVariant('png') ,  'enroll_name': QVariant('png') ,  'notes': QVariant('png') ,   'file': QVariant('png') ,
            'np_database': QVariant('png') , 'PNG-image': QVariant(png) }

v = QVariant(data)

block = QByteArray()
    xout = QDataStream(block, QIODevice.WriteOnly)
    xout.setVersion(qt.QDataStream.Qt_5_10)
    # xout << QByteArray(text.encode('utf-8')) << QByteArray((png))
    xout << v
    xox = (b'')
    xox = block.data()
    res = client.publish(test_kanali, xox, 2, retain=False)

I try to receive the data from Qt C++ code as below but no succes :

....
..

QDataStream stream(message)
stream.setversion(.....)

QVariantMap v_map;

stream  >> v_map;

How can I receive python QVariant(dict) from C++ code as above ? Any idea?

Thanks/Best

SGaist

Hi,

What if you load it directly in a QVariant ?

RahibeMeryem

@SGaist

no succes...

exchanging QVariant between python and C++ could be very usefull..

Is there anyway to do this ?

Best

eyllanesc

@RahibeMeryem Why don't you convert it to json?

import json

data = {
    "mq_username": "123",
    "np_database": "png",
    "category": "png",
    "enroll_name": "png",
    "notes": "png",
    "file": "png",
    "np_database": "png",
    "PNG-image": "png",
}

res = client.publish(test_kanali, json.dumps(data), 2, retain=False)

QVariantMap v_map;
QJsonDocument doc = QJsonDocument::fromJson(message);
if(iobj.isObject()){
    QJsonObject obj = doc.object();
    for(const  QString & key: obj.keys()){
        v_map[key] = obj[key].toVariant();
    }
}
qDebug() << v_map;