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

[1520 gis]

Dear Ludwig,

That was it. I don't know somehow the init function went through with just
one underscore. Now it's working smoothly and beautifully. QGIS is just
amazing.

Thank you very much for your contribution and help.

Best regards

Julierme

On Thu, Aug 17, 2023 at 4:37 AM Ludwig Kniprath <ludwig at kni-online.de>
wrote:

> Hi Julierme,
>
> that's another and not a new problem, the button-widget and setFixedSize
> did not work before and even do not work in standalone-python outside QGis.
>
> The reason is quite simple, we overlooked it before: double-underscores
> for the __init__-functions.
>
>
> Here the running code, which does what You want (commented lines for
> QGis-usage, uncomment for standalone):
>
>
> 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()
>
>
>
>
> hth
>
> Ludwig
>
>
>
> Am 17.08.23 um 04:14 schrieb 1520 gis:
>
> Hi Ludwig,
>
> Thank you very much for your reply. You're right, QGIS stopped crashing,
> but now the button widget is not being carried out by the application
> window and neither the methods are working properly like the
> self.setFixedSize(QSize(400,300)). I am sending a window screenshot in
> attachment.
>
> I appreciated your time and help.
>
> Kind regards
>
> Julierme
>
> On Wed, Aug 16, 2023 at 4:07 PM Ludwig Kniprath via QGIS-User <
> qgis-user at lists.osgeo.org> wrote:
>
>> 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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>
>
> --
> ##########################################
> *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/>
>
>

-- 
##########################################
*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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