[Gabor]

Hi,

I started to experiment with this example. Unfortunately I keep getting the following error message:

ReferenceError: myGlobalObject is not defined.

myglobalobject.h:

#ifndef MYGLOBALOBJECT_H
#define MYGLOBALOBJECT_H

#include <QObject>

class MyGlobalObject : public QObject
{
    Q_OBJECT

public:
    MyGlobalObject();

public slots:
    void doSomething(const QString &text);
};

#endif // MYGLOBALOBJECT_H

main.cpp:

#include <QApplication>
#include <VPApplication>

#include <QQmlApplicationEngine>
#include <QQmlContext>
#include "myglobalobject.h"


int main(int argc, char *argv[])
{
    QApplication app(argc, argv);
    VPApplication vplay;

    vplay.setPreservePlatformFonts(true);

    QQmlApplicationEngine engine;
    vplay.initialize(&engine);

    vplay.setMainQmlFileName(QStringLiteral("qml/Main.qml"));

    MyGlobalObject *myGlobal = new MyGlobalObject();
    myGlobal->doSomething ("TEXT FROM C++");
    engine.rootContext ()->setContextProperty ("myGlobalObject",myGlobal);

    engine.load(QUrl(vplay.mainQmlFileName()));

    return app.exec();
}

myglobalobject.cpp:

#include "myglobalobject.h"
#include <QDebug>

MyGlobalObject::MyGlobalObject()
{

}

void MyGlobalObject::doSomething(const QString &text)
{
qDebug() << "MyGlobelObject doSomething called with " << text;
}

main.qml:

import Felgo 3.0
import QtQuick 2.0

App {

    NavigationStack {

        Page {
            title: qsTr("Integration")

            Column {

                AppButton {
                    text: "MyGlobalObject.doSomething()"
                    onClicked: myGlobalObject.doSomething("TEXT FROM QML")
                }
            }
        }
    }
}

Please tell me what is wrong with my code.

Thank you for your help.

[GüntherFelgo Team]

Hi,

are you manually building the project with the green play button in Qt Creator?

As this example uses C++ code, which require compilation, these code parts are not available when using the Felgo Live Preview on Desktop or Mobiles.

Best,
Günther

[Gabor Toth]

Hi  Günther,

I tried both ways and I even cleaned, ran qmake and rebuilt the project. I kept getting the same error message. I am handbuilding it to learn.

When I downloaded the sample and ran it it was looking for a company file in c++. How can I create that company file?

Thank you.

 

[GüntherFelgo Team]

Hi,

did you make any changes that could affect the demo behavior, or do you run into this issue directly with the demo taken from GitHub?

 

Regarding the myGlobalObject identifier: In your main.cpp, this line adds the myGlobalObject context property:

    engine.rootContext ()->setContextProperty ("myGlobalObject",myGlobal);

Thus, you should be able to to use the myGlobalObject identifier in your QML code.

You can also find a written guide about the Felgo CPP Example here: https://felgo.com/cross-platform-development/how-to-expose-a-qt-cpp-class-with-signals-and-slots-to-qml

 

Hope this helps,
Günther from Felgo

[Gabor Toth]

Hi,

I ran into the issue with the downloaded example. I reinstalled Qt and that solved the issue. Thank you for your help.