[Qgis-user] How can I reset the starting point of a QgsFeatureIterator?

[Stefano Masera]

The reason is to be more fast. 
I think that restart an iterator is more fast than grab a new one from the same layer. 
But I don't know if it's true! 
Thanks 



----- Messaggio originale -----

Da: "Nathan Woodrow" <madmanwoo at gmail.com> 
A: "Stefano Masera" <stefano.masera at arpa.piemonte.it> 
Cc: "qgis-user" <qgis-user at lists.osgeo.org> 
Inviato: Lunedì, 21 ottobre 2013 15:56:35 
Oggetto: Re: [Qgis-user] How can I reset the starting point of a QgsFeatureIterator? 


Just grab a new iterator. Any reason you want to reuse the same iteratror. 
On 21/10/2013 11:44 PM, "Stefano Masera" < stefano.masera at arpa.piemonte.it > wrote: 




Hi list, 
I use an iterator two times in a python code and I have to reset it to the starting point before to recall it. 


# first use of the iterator 
iterator = layer.dataProvider().getFeatures() 

for feature in iterator: 
# operations 

# than, a second time I have to use the operator, in a following part of the code: 

for feature in iterator: 
# other operations 


But it doesn't start from the first feature! 



I try with: 
iterator.rewind() 
between the two blocks, but it doesn't work. 


Thanks. 





Stefano Masera 

_______________________________________________ 
Qgis-user mailing list 
Qgis-user at lists.osgeo.org 
http://lists.osgeo.org/mailman/listinfo/qgis-user 



-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/qgis-user/attachments/20131021/0ec957ee/attachment.html>