[QGIS-Developer] QGIS Seg fault from python

[Chris Crook]

For the record it seems that the seg fault is coming from the line

    symbol=QgsLineSymbol([basePointLine])

It works perfectly using:


    symbol=QgsLineSymbol()
    symbol.changeSymbolLayer(0,basePointLine)

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From: Chris Crook
Sent: Saturday, 5 October 2019 9:03 a.m.
To: qgis-developer at lists.osgeo.org
Subject: QGIS Seg fault from python

Hi All

I am trying to configure a renderer with a marker line in python.  Currently it is killing QGIS with seg fault.  Running recent dev build or 3.8.4 on ubuntu 18.04.

Below is the code I am running in python console which crashes QGIS.  Any ideas as to what I am doing wrong?

Thanks in advance
Chris

#!/usr/bin/python3
from qgis.core import *
from PyQt5.QtCore import *
from PyQt5.QtGui import *

def tryit():
    basePointSymbol = QgsMarkerSymbol.createSimple({})
    basePointLine = QgsMarkerLineSymbolLayer()
    basePointLine.setPlacement(QgsMarkerLineSymbolLayer.FirstVertex)
    basePointLine.setSubSymbol(basePointSymbol)
    symbol=QgsLineSymbol([basePointLine])
    renderer = QgsSingleSymbolRenderer(symbol)
    layer=iface.mapCanvas().currentLayer()
    layer.setRenderer(renderer)
    layer.triggerRepaint()

tryit()

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