On Mon, 5 Dec 2022 at 07:35, Chris Crook via QGIS-Developer
<qgis-developer@lists.osgeo.org> wrote:
>
> Hi Developers
>
> The contour plugin I have been maintaining seems to occasionally lose the C++
> object that its processing algorithm is using.
> In particular this happens when changing settings.
>
> Before I get lost trying to track this through the Python/SWIG bindings and
> comparing with other processing algorithms I am wondering if this is familiar
> or you can offer ideas about how to track it down. It seems either my python
> object is persisting too long or or the underlying C++ object not long
> enough, but I'm very unfamiliar with SWIG so any suggestions would be very
> welcome 🙂
There's a bug in your loadAlgorithms() implementation. In this you
need to create a NEW instance of each algorithm, rather then adding an
instance which has previously been add in an earlier call to
loadAlgorithms().
Ie DON'T do this:
def __init__(self):
self.algs = [MyAlgorithm()]
def loadAlgorithms(self):
for alg in self.algs:
self.addAlgorithm(alg)
Rather do something like this:
def loadAlgorithms(self):
for alg in [MyAlgorithm()]:
self.addAlgorithm(alg)
(or alternatively:
def __init__(self):
self.alg_classes = [MyAlgorithm]
def loadAlgorithms(self):
for alg_class in self.alg_classes:
self.addAlgorithm(alg_class())
)
Hope that helps!
Nyall
>
> Thanks
> Chris
> ________________________________
> From: Taras Dubrava <notificati...@github.com>
> Sent: 04 December 2022 01:11
> To: ccrook/QGIS-Contour-Plugin <qgis-contour-plu...@noreply.github.com>
> Cc: Subscribed <subscri...@noreply.github.com>
> Subject: [ccrook/QGIS-Contour-Plugin] RuntimeError : wrapped C/C++ object of
> type ContourGeneratorAlgorithm has been deleted (Issue #46)
>
>
> Every time when I change the background colour in QGIS the following error
> appears
>
> QGIS 3.28 Firenze
>
> —
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