Hi Nicholas,
The short answer is because your C++ is doing completely different
things to the python code. :O)
I'm not sure about using QML. Have you included the qml file as a
resource correctly to access via qrc:? You aren't checking the result
of the engine.load. Also, why is the lambda exiting the application
when the objectCreated matches the url?
Have run the Qt QML examples? How is your C++ code different to those?
Hope that helps, Tony
On 3/06/2021 11:33 am, Nicholas Yue wrote:
Hi,
I am learning about QML.
I would like to find out why the PySide2 loading of the QML file
results in a visible window but the C++ one does not. The compiled
application runs but no window is displayed.
MenuBar.qml
===========
import QtQuick 2.4
import QtQuick.Controls 2.13
ApplicationWindow {
visible: true
width: 720
height: 480
title: "simple window"
menuBar: MenuBar{
Menu{
title: "Menu1"
}
Menu{
title: "Menu2"
}
Menu{
title: "&Menu3"
}
}
}
main.cpp
========
#include <QGuiApplication>
#include <QQmlApplicationEngine>
int main(int argc, char *argv[])
{
QCoreApplication::setAttribute(Qt::AA_EnableHighDpiScaling);
QGuiApplication app(argc, argv);
QQmlApplicationEngine engine;
const QUrl url(QStringLiteral("qrc:/MenuBar.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();
}
main.py
=======
import sys
from PySide2 import QtCore, QtGui, QtQml
if __name__ == '__main__':
QtCore.QCoreApplication.setAttribute(QtCore.Qt.AA_EnableHighDpiScaling)
app = QtGui.QGuiApplication(sys.argv)
engine = QtQml.QQmlApplicationEngine()
url = QtCore.QUrl.fromLocalFile('MenuBar.qml')
engine.load(url)
if not engine.rootObjects():
sys.exit(-1)
sys.exit(app.exec_())
--
Nicholas Yue
Graphics - Arnold, Alembic, RenderMan, OpenGL, HDF5
Custom Dev - C++ porting, OSX, Linux, Windows
http://au.linkedin.com/in/nicholasyue
<http://au.linkedin.com/in/nicholasyue>
https://vimeo.com/channels/naiadtools
<https://vimeo.com/channels/naiadtools>
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