How to show QWidget and QtQuick.Window

Knj.Tkm

Hi.

I need to show QWidget and QtQuick.Window.
However, when I try to do so, it force quits.
When I ran it in debug, I found that SIGSEGV was occurring, but I don't know how to avoid it.
SIGSEGV is occurring at windowForWidget in qapplication_p.h.
How can I do this correctly?

My environment:
Qt: 1.15.2 (QMake)
Compiler: MinGW7.3.0

My Code:

//main.cpp
#include <QGuiApplication>
#include <QApplication>
#include <QQmlApplicationEngine>
#include "Form.h"

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

    qmlRegisterType<Form>("Form", 1, 0, "Form");

    QApplication 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);

    return app.exec();
}

//Form.h
#ifndef FORM_H
#define FORM_H

#include <QObject>
#include <QWidget>

namespace Ui {
class Form;
}

class Form : public QWidget
{
    Q_OBJECT
public:
    Form();
private:
    Ui::Form *ui;
};
#endif // FORM_H


//Form.cpp
#include "Form.h"
#include "ui_Form.h"

Form::Form() : QWidget(), ui(new Ui::Form)
{
    ui->setupUi(this);
}

//main.qml
import QtQuick 2.15
import QtQuick.Window 2.15
import Form 1.0

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

    Form {
        id: myForm
    }
}

SGaist

Hi,

That's because widgets are not meant to be embedded like that.

You can check KDAB's Declarative Widget project to mix widgets and QtQuick.