Howto dynamically modify 2D array of QvariantList?

[lorenwell]

Hi all,

I want to dynamically create a 2D array of QVariantList to pass it to qml after (for plotting)

I cannot append any values to any qvariantlist inside a qvariantlist.

What I am doing wrong?

#include <QGuiApplication>
#include <QQmlApplicationEngine>

#include "QDebug"


int main(int argc, char *argv[])
{
#if QT_VERSION < QT_VERSION_CHECK(6, 0, 0)
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
#endif

    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;
    const QUrl url(QStringLiteral("qrc:/main.qml"));
    QObject::connect(&engine, &QQmlApplicationEngine::objectCreated,
                     &app, [url](QObject *obj, const QUrl &objUrl) {
        if (!obj && url == objUrl)
            QCoreApplication::exit(-1);
    }, Qt::QueuedConnection);
    engine.load(url);


    QVariantList list1;
    QVariantList list2;

    //create row0
    list2.push_back("row0col1");
    list2.push_back("row0col2");
    list2.push_back("row0col3");
    list2.push_back("row0col4");

    list1.push_back(list2);
    qDebug() << "list1=" << list1;

    //create row1
    list2[0].toList().push_back("row1col1");
    list2[1].toList().push_back("row1col1");
    list2[2].toList().push_back("row1col1");
    list2[3].toList().push_back("row1col1");
    qDebug() << "list1=" << list1;

//noting append to  list2 :(


    return app.exec();
}

import QtQuick 2.12
import QtQuick.Window 2.12

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")
}

Thanks

BRs

[Christian Ehrlicher]

@lorenwell said in Howto dynamically modify 2D array of QvariantList?:

What I am doing wrong?

You forgot to add/replace list2 in list1 after you modified it.