CODEWITHSUNDEEP
c++qml
DavidJ
DavidJ

Reputation: 4577

Reading a QML array property from C++

Given QML such as:

Item {
  objectName: "myitem"
  property var myarr: [1,2,3]
}

How can it be read from C++?

The following doesn't work:

QObject* item = root->findChild<QObject*>("myitem");
QVariant value = item->property("myarr");

While value.isValid() returns true, if I query QMetaType::typeName( QMetaType::Type(int(value.type())) ) it yields "QWidget*".

(Using Qt 5.9.4 on x86)

Upvotes: 2

Views: 523

Answers (1)

eyllanesc
eyllanesc

Reputation: 244132

This returns a list of QVariant since it is the most generic type, in the next example I unpack it and store it in a container:

if(QObject *item = root->findChild<QObject *>("myitem")){
    std::vector<int> vector; // another option std::vector<float>;
    for(const QVariant & v: item->property("myarr").toList()){
       vector.push_back(v.toInt()); // another option toFloat();
    }
    qDebug() << vector;
}

Upvotes: 1

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