[Qgis-developer] set attributes of a new feature

[Chris Crook]

HI Siki

You need to keep the fields() array as a python entity for the duration of the existence of the feature...

that is

   feat=QgsFeature()
   fields=lay.dataProvider().fields()
   feat.setFields(fields,true)
   feat['point_id']=xxx


Think this should work...

Cheers
Chris
________________________________________
From: Siki Zoltan [siki at agt.bme.hu]
Sent: 16 November 2014 03:21
To: qgis-developer at lists.osgeo.org
Subject: [Qgis-developer] set attributes of a new feature

Dear List Members,

i've got in trouble creating new point feature in a shape file using
python (QGIS 2.2 on Fedora):

feat = QgsFeature()
feat.setFields(lay.dataProvider().fields(), True)
feat.setAttribute(feat.fieldNameIndex('point_id'), xxx)

The fieldNameIndex call makes QGIS crash

QGIS died on signal 11[Thread debugging using libthread_db enabled]
[New Thread 0x7f60fe021700 (LWP 12981)]
0x00000034ef8ac30d in waitpid () from /lib64/libc.so.6
[Current thread is 1 (Thread 0x7f610488b860 (LWP 12980))]
#0  0x00000034ef8ac30d in waitpid () from /lib64/libc.so.6
No symbol table info available.
#1  0x000000000055d0d9 in qgisCrash(int) ()
No symbol table info available.
#2  <signal handler called>
No symbol table info available.
#3  0x00000000005bc8bb in QVector<QgsFields::Field>::count() const ()
No symbol table info available.
...

lay is a valid layer:
(Pdb) p lay.name()
u'coord_sample'

The feature has attributes:
(Pdb) len(feat.attributes())
6

but
(Pdb) p feat.attributes()
[None, None, None, None, None, None]

but
(Pdb) lay.dataProvider().fields()[0].name()
u'point_id'

How can I populate attributes of the new feature?

Thanks,
Zoltan


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