<![CDATA[QtNodeEditor library data transfer problem]]>Hello, I would like to use QtNodeEditor library . I setup the system. Classes, functions, signals and slots. Everything is working. I can transfer data node to node.

There is a problem. Firstly, I want to tell my steps.

1 - take data from tcp server
2 - transfer data with signal-slot to node
3 - push data to connected nodes.
4 - nodes calculate data
5 - nodes update ui

6f85f1fc-321e-48e3-9ba5-b172a7e87c34-image.png

Step 3 is use emit for push data connected nodes and every node step by step calculating. I should not to use this way because, if my connected node size increase, total time increase.

If I do not use nodes and directly push data to obj which is comminicated with node, Time is ok, slow but ok, better then node push system.

    QtConcurrent::blockingMap(list, [&data](MyObj*pc) {
        pc->compute(data);
    });
    for (MyObj*pc : list)
        pc->render(); // render must be in main thread

// or

    QThreadPool *pool = QThreadPool::globalInstance();
    for (MyObj*pc : list){
        MyObjJob *job = new MyObjJob ;
        job->pc = pc;
        job->data = &data;

        job->setAutoDelete(true);

        pool->start(job);
    }
    pool->waitForDone();

    for (MyObj*pc : list)
        pc->render();

Parallel computing is solituon.

I want to ask, There is a someone worked or still work with QtNodeEditor library and help me ?

]]>https://forum.qt.io/topic/164439/qtnodeeditor-library-data-transfer-problemRSS for NodeSun, 26 Apr 2026 09:48:31 GMTMon, 16 Mar 2026 10:51:25 GMT60<![CDATA[Reply to QtNodeEditor library data transfer problem on Wed, 18 Mar 2026 19:47:18 GMT]]>There's quite a lot of libraries using Qt and one of the pitfall is that even if there's Qt in the name it does not make them an official Qt module nor a supported Qt library.
However, it is still valid to ask questions about them here as there might be a chance that one, or more, forum members might have experience with it.

]]>https://forum.qt.io/post/837169https://forum.qt.io/post/837169Wed, 18 Mar 2026 19:47:18 GMT<![CDATA[Reply to QtNodeEditor library data transfer problem on Wed, 18 Mar 2026 05:18:06 GMT]]>@SGaist said in QtNodeEditor library data transfer problem:

never heard of it before you mentioned it so it might also be the case of other current active forum contributors.

Thank you for your advice, I use lots of library with Qt and, sometimes I do not know what I will do

]]>https://forum.qt.io/post/837164https://forum.qt.io/post/837164Wed, 18 Mar 2026 05:18:06 GMT<![CDATA[Reply to QtNodeEditor library data transfer problem on Tue, 17 Mar 2026 23:02:03 GMT]]>Hi,

You should try to contact the library's author(s).

I never heard of it before you mentioned it so it might also be the case of other current active forum contributors.

]]>https://forum.qt.io/post/837161https://forum.qt.io/post/837161Tue, 17 Mar 2026 23:02:03 GMT<![CDATA[Reply to QtNodeEditor library data transfer problem on Tue, 17 Mar 2026 09:43:38 GMT]]>I did like that but I could not be sure is it right ?

// Original
void MyNode::onSendData(const QVector<float> &data)
{
    _data= std::make_shared<Data>();
    _data->data= data;

    emit dataUpdated(0); // Step by step for each connection
}

// My Edit
void MyNode::onSendData(const QVector<float> &data, std::shared_ptr<AppGraphModel> &graphModel, QtNodes::NodeId &id)
{
    _data= std::make_shared<Data>();
    _data->data= data;

    auto conns = graphModel->connections(id, QtNodes::PortType::Out, 0);
    QList<QtNodes::ConnectionId> connList(conns.begin(), conns.end());

    QtConcurrent::map(connList, [&](const QtNodes::ConnectionId &conn) {
        auto *node = graphModel->delegateModel<QtNodes::NodeDelegateModel>(conn.inNodeId);
        if (node)
            node->setInData(_data, conn.inPortIndex);
    }).waitForFinished();
}

Does nobody use QtNodeEditor lib ?

]]>https://forum.qt.io/post/837147https://forum.qt.io/post/837147Tue, 17 Mar 2026 09:43:38 GMT