[Qgis-user] QGIS3 quits after PyQt Script 2 run

[Ludwig Kniprath]

Hi Julierme,

I think Your problem is, that You try to create a new application with 
"app = QApplication(sys.argv)" inside a running QGis, which already is a 
running Qt-application.

Simplified code should perform without crash:

import sys
from PyQt5.QtCore import (QSize,Qt)
from PyQt5.QtWidgets import (QApplication, QWidget, QPushButton, 
QMainWindow)

class MainWindow(QMainWindow):
     def _init_(self):
         super()._init_()
         self.setWindowTitle("My App")
         button = QPushButton("Press Me!")


         self.setCentralWidget(button)
         self.setFixedSize(QSize(400,300))

window = MainWindow()
window.show()


hth

Ludwig

Am 16.08.23 um 19:15 schrieb 1520 gis via QGIS-User:
> Hi all,
>
> I wrote the PyQt script below and I am running it through QGIS3. When 
> I run it for the first time after opening it in QGIS3, the 
> application's window pops up smoothly. However, when I close the 
> window and run the script, QGIS3 readily quits.  That may be something 
> related to the event loop, but I'm unsure and don't know how to stop 
> the QGIS3 shutdown for the subsequent runs.  Any hint on how to fix 
> this issue will be very appreciated.
>
> import sys
> from PyQt5.QtCore import (QSize,
>                           Qt)
> from PyQt5.QtWidgets import (QApplication,
>                               QWidget,
>                               QPushButton,
>                               QMainWindow)
> class MainWindow(QMainWindow):
>     def _init_(self):
>         super()._init_()
>         self.setWindowTitle("My App")
>         button = QPushButton("Press Me!")
>
>
>         self.setCentralWidget(button)
>         self.setFixedSize(QSize(400,300))
> app = QApplication(sys.argv)
> window = MainWindow()
> window.show()
> app.exec()
> -- 
> ##########################################
> *Julierme G Pinheiro*
> *SDI Expert & Geoprocessing Specialist*
> Phone: +55 61 99994-3569
> Website: GIS 
> <https://www.udemy.com/course/qgis-server-para-iniciantes-instalacao-e-configuracao/>
>
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