QML "ChartView" crashing app

BD9a

Hey, I want to use ChartView to show statistics, but when trying to run my app just crashing. I heard about replacing QGuiApplication to QApplication, is it possible? I want QtQuick / QML, not QWidgets.

:-1: error: Debugger encountered an exception: Exception at 0x3d34d8, code: 0xc0000005: read access violation at: 0x0, flags=0x0 (first chance)

jsulm

@BD9a As stated in https://doc.qt.io/qt-5/qapplication.html
You need

QT += widgets

Quang Phu

Hi @BD9a,
I heard about replacing QGuiApplication to QApplication, is it possible?
Yes, it's possible, change to QApplication, your QtQuict app still works fine!

BD9a

But how? When I just replace

QGuiApplication app(argc, argv);

to

QApplication app(argc, argv);

I got error:

variable has incomplete type 'QApplication'

and more:
alt text

JonB

@BD9a
Did you change to #include <QApplication> ?

BD9a

@JonB Nope, "QApplication file not found". My .pro file have this:

QT += quick
QT += quickcontrols2

main.cpp

#include <QApplication>
#include <QQmlApplicationEngine>
#include <QQmlContext>
#include <Building/building.h>
#include <Clicking/clicking.h>
#include <Keytranslator/keytranslator.h>
#include <Conf/conf.h>

int main(int argc, char *argv[])
{

    QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);

    QGuiApplication app(argc, argv);

    QQmlApplicationEngine engine;

    Building building;
    Clicking clicking;
    KeyTranslator ktr;
    Conf config;

    building.config = &config;
    clicking.config = &config;

    config.create();

    building.loopStart();
    clicking.loopStart();

    QQmlContext *ctx = engine.rootContext();
    ctx->setContextProperty("Building", &building);
    ctx->setContextProperty("Clicking", &clicking);
    ctx->setContextProperty("keyTranslator", &ktr);
    ctx->setContextProperty("Config", &config);

    engine.rootContext()->setContextProperty("applicationDirPath", QGuiApplication::applicationDirPath());
    engine.load(QUrl(QStringLiteral("qrc:/main.qml")));

    if (engine.rootObjects().isEmpty())
        return -1;

    return app.exec();
}

JonB

@BD9a
I know nothing about QML, only widgets which is where I would do this, given your error message. @Quang-Phu said it was doable/fine, maybe you need clarification from him....

jsulm

@BD9a As stated in https://doc.qt.io/qt-5/qapplication.html
You need

QT += widgets

BD9a

Thanks, it's working. I thought it's only QtQuick or QWidgets, not both.