I cannot include "QApplication" into a QtQuick project. I'm using Visual Studio 2022.

ZeeoTwo

So basically i tried using QtCharts, and i got an error, i found out i need to change my QGuiApplication into QApplication.
As far as i read on the internet i just had to #include <QtWidgets/qapplication.h>
and i ended up with code like this:

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QtWidgets/qapplication.h>`

int main(int argc, char* argv[]) {
#if defined(Q_OS_WIN)
    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
#endif

    QApplication app(argc, argv);

    QQmlApplicationEngine engine;

    engine.addImportPath("qrc:/");

    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));
    if (engine.rootObjects().isEmpty())
        return -1;

    return app.exec();
}

and it should work. Unfortunately it don't.

How can i fix this error.?

My compiler can find this file but it can't find qapplication.cpp where all the definitions are.
I also do not have any .pro file neither qmake or cmake.

Do i need to install something in qt maintenance tool (i already installed Qt Charts)
Do i need to create a new project? (i would preffer not to)

My Qt version: 6.4.0
My compiler version:

TomZ

@ZeeoTwo said in I cannot include "QApplication" into a QtQuick project. I'm using Visual Studio 2022.:

I also do not have any .pro file neither qmake or cmake.

So, what buildsystem do you use?

You likely are simply not using the QWidgets module in your project.

ZeeoTwo

@TomZ said in I cannot include "QApplication" into a QtQuick project. I'm using Visual Studio 2022.:

So, what buildsystem do you use?

i found this folder in my project:

so qmake i guess but i do not have any qmake file in acctual project folder

You likely are simply not using the QWidgets module in your project.

Soo how can i start using it?
Can i do it simply and fast or do i need to just learn qmake and figure it out?

J.Hilk

@ZeeoTwo there's a QML version of QCharts:
https://doc.qt.io/qt-6/qtcharts-qmlchart-example.html

use that one. Don't mix QML and QWidget if you don't have to & also the qml variant is much more performant than the QWidget one

ZeeoTwo

@J-Hilk

@ZeeoTwo there's a QML version of QCharts:

i know there is a qml version but i can't use it without changing from QGuiApplication to QApplication

this is my qml file that im loading using loader into my main.qml:

import QtQuick
import QtCharts 2.4
import QtQuick.Controls 2.15
import QtQuick.Layouts 1.15
import Config 1.0
    Rectangle{
        id: home
    
            ChartView {
            id: chart
            title: "Top-5 car brand shares in Finland"
            anchors.fill: parent
            legend.alignment: Qt.AlignBottom
            antialiasing: true

                PieSeries {
                    id: pieSeries
                    PieSlice { label: "Volkswagen"; value: 13.5 }
                    PieSlice { label: "Toyota"; value: 10.9 }
                    PieSlice { label: "Ford"; value: 8.6 }
                    PieSlice { label: "Skoda"; value: 8.2 }
                    PieSlice { label: "Volvo"; value: 6.8 }
                }
            }
    }

and after running it using QGuiApplication i get:

ZeeoTwo

Okay i got it working.
I'm using Qt Vs Tools extension.
To make it work i had to open:
Extensions > Qt VS Tools > Qt Project Settings > Qt Project Settings (on the left) > Qt Modules
and inside that check QT Widgets.
I guess this is something like a pseudo .pro file or something.
and after including #include <QtWidgets/qapplication.h> inside main.cpp
and changing from QGuiApplication to QApplication inside main.cpp
everything worked, i got no errors and a chart.

Thank you for ur time @J-Hilk and @TomZ