[Qgis-developer] symbol.symbolLayer(n) triggers RTTI error in one place, but doesn't in another

[Matthias Kuhn]

Hi Tom,

If we are lucky, 2.14 users also no longer suffer from this issue as of
the next nighly build [1]

Bests
Matthias

[1]
https://github.com/qgis/QGIS/commit/176987ea0d352ae1b1d2a7bdc0daab176a24c69c

On 11/21/2016 12:03 PM, Tom Chadwin wrote:
> QGIS 2.18, qgis2web leafletRefactor branch 
> (https://github.com/tomchadwin/qgis2web/tree/leafletRefactor).
> 
> - open a point layer
> - change marker type to SVG
> - start qgis2web
> - OpenLayers 3 preview works
> - click Leaflet in plugin dialog
> - RTTI error
> 
> The error is triggered by:
> 
>  sl = symbol.symbolLayer(0)
> (https://github.com/tomchadwin/qgis2web/blob/leafletRefactor/leafletStyleScripts.py#L67)
> 
> However, these lines in the OpenLayers 3 export code does not trigger the
> RTTI error:
> 
> for i in xrange(symbol.symbolLayerCount()):
>     sl = symbol.symbolLayer(i)
> (https://github.com/tomchadwin/qgis2web/blob/leafletRefactor/olwriter.py#L851)
> 
> I just don't understand how the same method - symbol.symbolLayer(n) - can
> trigger the error in one place but not in the other (with everything
> identical in QGIS).
> 
> Matthias has removed the problem by removing the dependence of the SIP
> symbol bindings on RTTI (https://github.com/qgis/QGIS/commit/c3852c0).
> However, I still wonder if I can work around the issue, given that the
> OpenLayers call to symbol.symbolLayer(n) doesn't trigger the error.
> 
> If I can work around it, I could maintain qgis2web compatibility back to 2.8
> as I currently do. Otherwise, I'll have to switch to 2.18, and I don't like
> not supporting LTR (or I'll have to ask for c3852c0 to be backported to
> 2.14).
> 
> Does anyone have any ideas?
> 
> Thanks
> 
> Tom
> 
> 
> 
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