I think you also have to load QML module in PRO file:
MenuBar.pro
===========
QT += quick qml
Best regards
Fabrice Mousset
Von: Interest <interest-boun...@qt-project.org> Im Auftrag von Nicholas Yue
Gesendet: Donnerstag, 3. Juni 2021 06:09
An: Tony Rietwyk <t...@rightsoft.com.au>
Cc: interest@qt-project.org
Betreff: Re: [Interest] QML MenuBar : works with PySide2 but not c++ ?
I copied the qml loading code from another working example, I was just testing
a change in the QML content.
I'd have to dig further about the lambda
MenuBar.pro
===========
QT += quick
CONFIG += c++11
# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Refer to the documentation for the
# deprecated API to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS
# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version
of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs
deprecated before Qt 6.0.0
SOURCES += \
main.cpp
RESOURCES += main.qrc
# Additional import path used to resolve QML modules in Qt Creator's code model
QML_IMPORT_PATH =
# Additional import path used to resolve QML modules just for Qt Quick Designer
QML_DESIGNER_IMPORT_PATH =
# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target
main.qrc
=======
<RCC>
<qresource prefix="/">
<file>MenuBar.qml</file>
</qresource>
</RCC>
On Wed, 2 Jun 2021 at 20:36, Tony Rietwyk
<t...@rightsoft.com.au<mailto:t...@rightsoft.com.au>> wrote:
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
https://vimeo.com/channels/naiadtools
_______________________________________________
Interest mailing list
Interest@qt-project.org<mailto:Interest@qt-project.org>
https://lists.qt-project.org/listinfo/interest
_______________________________________________
Interest mailing list
Interest@qt-project.org<mailto:Interest@qt-project.org>
https://lists.qt-project.org/listinfo/interest
--
Nicholas Yue
Graphics - Arnold, Alembic, RenderMan, OpenGL, HDF5
Custom Dev - C++ porting, OSX, Linux, Windows
http://au.linkedin.com/in/nicholasyue
https://vimeo.com/channels/naiadtools
_______________________________________________
Interest mailing list
Interest@qt-project.org
https://lists.qt-project.org/listinfo/interest
