PySide 2 Sample application doesn't quit!

nullbuil7

Python Source:

import sys
from PySide2.QtGui import QGuiApplication
from PySide2.QtCore import QCoreApplication, Qt, QUrl
from PySide2.QtQuick import QQuickView

QCoreApplication.setAttribute(Qt.AA_EnableHighDpiScaling)
app = QGuiApplication(sys.argv)

view = QQuickView(QUrl('view.qml'))
view.show()

app.exec_()
sys.exit(0)

QML file:

import QtQuick 2.3
import QtQuick.Controls 1.4

Rectangle {
    width: 200
    height: 200
    color: "green"

    Button {
        text: "Hello World"
        anchors.centerIn: parent
        onClicked: Qt.quit()
    }
}

SGaist

Hi,

What version of Qt ?
On what OS ?
How did you install Qt ?

nullbuil7

Qt 5.5.1 (MSVC 2013, 32bit)
Windows 10 Pro 64bit
i got qt from a website that had an offline version build against mingw
and i installed PySide2 using Python 3 pip module

SGaist

I forgot: what version of PySide2 did you get with pip ?

nullbuil7

PySide2 version is 5.12.3
shiboken2 version is 5.12.3
they both are for py3.7-win-amd64

nullbuil7

Update on the situation i ran the code through command prompt directly and i received this error when i clicked the button:

Signal QQmlEngine::quit() emitted, but no receivers connected to handle it.

i googled the problem and it seems Qt has a new syntax and for this to work, I have to somehow make a connection between my .py and .qml file.

sorry for the late reply. I HAVE TO WAIT 600 SECONDS :D

nullbuil7

The docs notes:

    quit()

This function causes the QQmlEngine::quit() signal to be emitted. Within the Prototyping with qmlscene, this causes the launcher application to exit; to quit a C++ application when this method is called, connect the QQmlEngine::quit() signal to the QCoreApplication::quit() slot.

Clearly point out that you have to connect the QQmlEngine::quit() of QQuickView to QCoreApplication::quit():

import os
import sys

from PySide2.QtCore import QCoreApplication, Qt, QUrl
from PySide2.QtGui import QGuiApplication
from PySide2.QtQuick import QQuickView

if __name__ == '__main__':
    QCoreApplication.setAttribute(Qt.AA_EnableHighDpiScaling)
    app = QGuiApplication(sys.argv)

    current_dir = os.path.dirname(os.path.realpath(__file__))
    filename = os.path.join(current_dir, 'view.qml')
    view = QQuickView(QUrl.fromLocalFile(filename))
    view.engine().quit.connect(QCoreApplication.quit)           <---
    view.show()

    sys.exit(app.exec_())

Credits to eyllanesc
https://stackoverflow.com/questions/57581974/qt-error-signal-qqmlenginequit-emitted-but-no-receivers-connected-to-handl

SGaist

Glad you found out and thanks for sharing !