[QGIS-Developer] Odd error

Paul Wittle paul.wittle at dorsetcouncil.gov.uk
Fri Apr 23 02:14:33 PDT 2021 

Hi,

I’ve done some more checks and decided that the error can be replicated outside of my plugin so I think it might be a more general bug relating to QgsProcessingParameterPoint.

I’ve created a script that you should be able to load to see if you can replicate the issue and it can be found at Example Process - Pastebin.com<https://pastebin.com/UaS4rWFW>

I’m on Windows 10 1909 and using QGIS version 3.16.0-Hannover (64bit).

Would someone be able to try loading the script for me and let me know if you can replicate the issue?

Thanks,
Paul

From: Paul Wittle
Sent: 22 April 2021 09:57
To: nagyrobi_r at yahoo.com; qgis-developer at lists.osgeo.org
Subject: RE: [QGIS-Developer] Odd error

Hi,

I’ve been thinking about this a bit more and I think the issue may relate specifically to the following lines:
dialog = processing.createAlgorithmDialog("script:atobroute",{})
       dialog.show()

I think the issue is that the dialog.show() opens the script dialog but that dialog then has interactive options where you can select a point from the map canvas. It is when you try to select the coordinates that QGIS crashes.

I think I tried using .exec_ instead of .show but of course the dialog opens and closes straight away. I think the issue may be that my plugin is waiting for the user to dismiss the dialog but is unhappy when it is hidden by the select from canvas tool.

I’ve slept since I wrote the script but I think the select from map is default functionality and the fields are defined as
self.addParameter(QgsProcessingParameterPoint(self.ORIG, 'Origin coordinates',None,True))

Is there a better way to open a script from a button on the toolbar. Ideally I want to simply replicate the behaviour of just double clicking the script from the processing toolbox.

Thanks,
Paul


From: Paul Wittle
Sent: 21 April 2021 09:16
To: nagyrobi_r at yahoo.com<mailto:nagyrobi_r at yahoo.com>
Subject: RE: [QGIS-Developer] Odd error

Hi,

Yes I used plugin builder as a base for the plugin. Here is the code in question:

#Create the routing toolbar
        self.routebar = self.iface.addToolBar("Routing Tools")
        self.routebar.setObjectName(u'Routing Tools')

        text = QLabel(
            QCoreApplication.translate('CouncilPlugin', 'Routing Tools:')
            )
        #No action to connect to this!
        self.routebar.addWidget(text)

        route1 = QAction(
            QIcon(':/plugins/council_plugin/AtoB.png'),
            QCoreApplication.translate('CouncilPlugin', 'Route from A to B'),
            self.iface.mainWindow()
            )
        route1.triggered.connect(self.AtoB)
        self.routebar.addAction(route1)

#Routing Tools
    def AtoB(self):
        self.CheckRoutingTools() #Always check the scripts are up to date first
        dialog = processing.createAlgorithmDialog("script:atobroute",{})
        dialog.show()

I don’t think it gives an error message. QGIS just disappears and you have to re-open it.

Thanks,
Paul


From: nagyrobi_r at yahoo.com<mailto:nagyrobi_r at yahoo.com> <nagyrobi_r at yahoo.com<mailto:nagyrobi_r at yahoo.com>>
Sent: 21 April 2021 09:11
To: Paul Wittle <paul.wittle at dorsetcouncil.gov.uk<mailto:paul.wittle at dorsetcouncil.gov.uk>>
Subject: Re: [QGIS-Developer] Odd error

Hei!

Have you bilt the plugin using "plugin builder?
Could you send the error message?

Cheers,
Robert

On Wed, Apr 21, 2021 at 10:00 AM, Paul Wittle
<paul.wittle at dorsetcouncil.gov.uk<mailto:paul.wittle at dorsetcouncil.gov.uk>> wrote:

Hi,



I have a python script that I wrote which routes from point A to B using the default tools in QGIS. If I go to the processing toolbox and open the dialog it runs fine and everything is great.



I also have a python plugin and I put a button in a toolbar to open the same script. It loads the dialog but when you try to run it the whole thing crashes out and QGIS disables my plugin.



Does anyone have any suggestions as to what I might have done wrong?



I’m assuming the issue is related to how I’m calling the script from my plugin rather than the script itself as it runs independently from the processing toolbox fine 😊



Any suggestions would be appreciated.



Paul Wittle

[cid:image001.jpg at 01D73829.73787E10]<https://www.dorsetcouncil.gov.uk/>

Business Solutions Analyst (GIS)

ICT Operations

Dorset Council

01305 228473

dorsetcouncil.gov.uk<https://www.dorsetcouncil.gov.uk>



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