Thank you both Germán and David, Original code didn't crashed a QGIS 3.28.11 here, but it seemed to work silently with an empty reference layer.
Regards, Gabriel El vie, 20 oct 2023 a la(s) 10:23, Germán Carrillo ( carrillo.ger...@gmail.com) escribió: > *> The underlying C++ code expects a pointer to the reference layer. If > the python wrapper just passes the pointer of the object that was created > in the call, the object will be out of scope after the function call > returns and will be garbage collected. Someone who actually knows the code > details can verify or contradict this.* > > This makes sense to me. > In fact, the original code makes QGIS crash (using v3.28.6) with a > Segmentation Fault, indicating that the underlying C++ object has been > deleted. > That's why you should first create a Python variable to make it clear that > the layer object should persist in the outer scope. > > Regards, > > Germán > > > El vie, 20 oct 2023 a las 5:30, David Strip (<qgis-u...@stripfamily.net>) > escribió: > >> On 10/19/2023 10:32 AM, Gabriel De Luca via QGIS-Developer wrote: >> >> Hi German, >> >> Thanks. Yes, it works that way. Do you know why? >> >> >> Regards, >> Gabriel >> >> >> Since nobody who really knows the code has responded yet, I'll conjecture >> it's a scoping issue. The underlying C++ code expects a pointer to the >> reference layer. If the python wrapper just passes the pointer of the >> object that was created in the call, the object will be out of scope after >> the function call returns and will be garbage collected. Someone who >> actually knows the code details can verify or contradict this. >> > > > -- > ----------- > |\__ > (:>__)( > |/ > Soluciones Geoinformáticas Libres > http://geotux.tuxfamily.org/ > https://twitter.com/GeoTux2 <http://twitter.com/GeoTux2> > > <http://gis.stackexchange.com/users/4972/germ%c3%a1n-carrillo> >
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