[Qgis-developer] buffer segmentation fault

[Richard Duivenvoorde]

Hi Carson,

I did have this behaviour a few months ago (around preview 1). I use the 
buffer function to define an AREA for point features in the HtmlImageMap 
plugin.
But after a certain version it doesn't segfault anymore, so I thought it 
was a known problem which was fixed.

Trying your lines in a Windows Preview2 NOW does NOT segfault qgis here.
On a freshly build 1.0 also not at this moment.
I'm not able to build trunk at this moment.

Does the memory/pointer erro Martin is pointing at maybe have something 
to do with it?

Regards,

Richard Duivenvoorde

Carson Farmer wrote:
> Hello again,
> 
> Quick question for the list before I submit a bug...
> 
> Is anyone else getting a segmentation fault when attempting to buffer 
> features (points, lines, or polygons)? It is possible this is a GEOS 
> issue, but I'm not sure...
> 
> Here is some sample code to try in the python console if you want to 
> confirm the above behaviour (assumes your target layer is the first 
> layer in your TOC):
> 
>  >>> map_canvas = iface.mapCanvas()
>  >>> layer = map_canvas.layer( 0 )
>  >>> provider = layer.dataProvider()
>  >>> all_attributes = provider.attributeIndexes()
>  >>> provider.select( all_attributes )
>  >>> feature = QgsFeature()
>  >>> provider.nextFeature( feature )
>  >>> geometry = feature.geometry()
>  >>> buffer = geometry.buffer( 500, 5 ) #replace with some relevant 
> value...
> 
> and here QGIS closes unexpectedly, leaving the following in the console:
> 
> Python support ENABLED :-)
> Loaded : Plugin Installer (package: plugin_installer)
> Loaded : fTools (package: fTools)
> Segmentation fault
> 
> Cheers,
> 
> Carson
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