AW: Re: [Qgis-developer] provider.getNextFeature(fet) with PostGIS

[Düster Horst]

Code and corresponding outputs with respect to an example postgis layer:


...
    print "N-Features: "+str(provider.featureCount())
# Output: "N-Features: 4 "

    provider.getNextFeature(feat)
    attrib = feat.attributeMap()
    geom = feat.geometry()

    print "Geomtry: "+geom.exportToWkt()
# Error message: AttributeError: 'NoneType' object has no attribute
'exportToWkt'
    print "AttributeMap: "+str(attrib)    
# Output: "AttributeMap: {}"
...

The number of features is correct but no geometry and no attributeMap

Regards
Horst
------------------------------------------------

Dr. Horst Düster
GIS-Koordinator, Stv. Amtschef

Kanton Solothurn
Bau- und Justizdepartement
Amt für Geoinformation
SO!GIS Koordination
Rötistrasse 4
CH-4501 Solothurn

Telefon ++41(0)32 627 25 32
Telefax ++41(0)32 627 22 14

mailto:horst.duester at bd.so.ch
http://www.agi.so.ch



-----Ursprüngliche Nachricht-----
Von: Marco Hugentobler [mailto:marco.hugentobler at karto.baug.ethz.ch]
Gesendet am: Mittwoch, 13. Februar 2008 12:39
An: qgis-developer at lists.osgeo.org
Cc: Düster Horst
Betreff: Re: [Qgis-developer] provider.getNextFeature(fet) with PostGIS

I recently did some changes in the postgres provider to enhance
efficiency. 
Maybe this is a side-effect of my changes? It would therefore be
interesting 
to know what exactly does not work. Is the geometry empty? Or the
attribute 
information missing? Also, it would be good to know the arguments you
passed 
to 'getNextFeature'.

As it works with .shp layers, I think it is very unlikely that it is a
python 
bindings problem.

Regards,
Marco 


Am Mittwoch 13 Februar 2008 12:14:29 schrieb Düster Horst:
> Martin
>
> Thank you for Rev. 8153 now setAttributeMap() works fine. But now I'm
> faced with the next problem.
>
> provider.getNextFeature()
>
> doesn't work no more with PostGIS layers. It works fine with *.shp
> layers.
>
> Maybe the same issue like setAttributeMap()???
>
> Geoprocessing Plugin:
> >In my opinion you can put your plugin to the repository, maybe some
> >people would like to join your efforts!
>
> How can I put the plugin to the repository??
>
> Regards
> Horst
>
> ------------------------------------------------
>
> Dr. Horst Düster
> GIS-Koordinator, Stv. Amtschef
>
> Kanton Solothurn
> Bau- und Justizdepartement
> Amt für Geoinformation
> SO!GIS Koordination
> Rötistrasse 4
> CH-4501 Solothurn
>
> Telefon ++41(0)32 627 25 32
> Telefax ++41(0)32 627 22 14
>
> mailto:horst.duester at bd.so.ch
> http://www.agi.so.ch



-- 
Dr. Marco Hugentobler
Institute of Cartography
ETH Zurich
Technical Advisor QGIS Project Steering Committee

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