Basic QQmlApplicationEngine in PySide6

sunkeita

@eyllanesc Thanks for the quick response, however this doesn't seem to work either. I also tested my original qml on PySide2 and it also doesn't work. I think I'm missing something more fundamental about how to load qml with qqmlapplicationengine.

SGaist

Hi and welcome to devnet,

Might be a silly question but are you sure about your QML file path ?

eyllanesc

@sunkeita I have tested the code with PySide2 and I get the same errors and the solution was the same.

sunkeita

@SGaist
The QUrl I am passing looks like this:

PySide6.QtCore.QUrl('file:///C:/Users/alan/PycharmProjects/sozu-tmt/sozu/main.qml')

The URI scheme with a Windows path name looks correct to me. I'm looking at trying to pass this in as a qresource in python which should move path lookup concerns to the point that resources are built.

eyllanesc

@sunkeita The url is correct, the problem is that you are using properties that do not exist. I recommend you review the docs: https://doc.qt.io/qt-5/qml-qtquick-controls2-applicationwindow.html to know what properties exist.

sunkeita

@eyllanesc Ok, that's good to know. I changed toolbar and statusbar to header and footer, and I've left out the minimum width and height for now. I haven't seen any docs about dropping the version from the import; the docs you linked have versioned imports as well. Could you provide a bit more clarity on this one?

sunkeita

@eyllanesc I made changes to the properties that I am using, as noted in the other thread. I haven't seen any doc that removes versions from the import line. After reviewing the documentation you linked, this is what I have.

I haven't gotten an actual error message about the qml load, it just doesn't get loaded. Not sure if that is because of bad qml or a qml path issue although I'm pursuing both as possible issues.

Thank you for your time and assistance!

import QtQuick 2.12
import QtQuick.Controls 2.12

ApplicationWindow {
    id: root
    visible: true
    title: qsTr("MyTitle")

    menuBar: MenuBar {}

    header: ToolBar {}

    footer: TabBar {}

    StackView {
        anchors.fill: parent
    }
}

eyllanesc

@sunkeita 1) You have not received any error message because as soon as your qml is launched, the interpreter cannot understand it so no rootObjects is built and therefore sys.exit(-1) is executed, 2) I recommend you check the blog of Qt since there they point out the new modifications that come with Qt6 that are not yet documented, unfortunately, at this moment I cannot find the link but when I find it I will give it to you but you can read this: https://jbbgameich.github.io/qt/2020/05/18/compiled-qml.html 3) If you want to get the warnings then use qmlscene: qmlscene.exe main.qml

eyllanesc

@sunkeita See https://wiki.qt.io/New_Features_in_Qt_6.0 in seccion QML:

Qt QML

The QML import and versioning system has been overhauled:
- Version numbers are optional in the QML language. An import without any version number imports the latest version of the module. An import with only a major version number imports the module with specified major version and the latest minor version.
- QML supports "auto" imports: Instead of specifying a version number, one can write import <module> auto. In that case the imported module is imported in the same version as the importing module.

sunkeita

@eyllanesc Thanks so much! On a lark I decided to try running this on my linux machine, and it worked just fine. I will try using qmlscene on my windows machine to find the errors there. I opened this thread to ensure that I was using QQmlApplicationEngine correctly, this issue is resolved.

Thanks again :)