[gdal-dev] issue updating shapefile using python bindings

[Mike]

Hi -
I have a script which at one point adds fields to a shapefile, then at
another time updates those fields. This happens a couple times through this
whole process.

#earlier

driver = ogr.GetDriverByName('ESRI Shapefile')

dataSource = driver.Open(inshp, 1)

layer = dataSource.GetLayer()

    idfield = ogr.FieldDefn('INFLD', ogr.OFTInteger)

    layer.CreateField(idfield)

dataSource = None



#later

driver = ogr.GetDriverByName('ESRI Shapefile')

dataSource = driver.Open(inshp, 1)

layer = dataSource.GetLayer()

layerDefinition = layer.GetLayerDefn()

flds = [layerDefinition.GetFieldDefn(i).GetName()

        for i in range(layerDefinition.GetFieldCount())]

for feature in layer:

    for fld in flds:

        ...

        print fld,somevalue,type(somevalue) # --> INFLD -9 <type 'int'>

        feature.SetField(fld,somevalue) # produces error (see below)

    layer.SetFeature(feature)

    feature = None

dataSource = None



This is the error I get. All of this (later part) is inside a function.
However when I run the function in IDLE, it works.


    feature.SetField(fld, somevalue)

  File "C:\PROGRA~1\QGIS2~1.18\apps\Python27\lib\site-packages\osgeo\ogr.py",
line 4273, in SetField

    return _ogr.Feature_SetFieldInteger64(self, fld_index, args[1])

TypeError: in method 'Feature_SetFieldInteger64', argument 2 of type 'int'


This is what ogrinfo reports on that field..

ogrinfo -so INSHP.shp

INFLD: Integer (9.0)


It seems that it won't take the integer of -9 into the field.


So, I am fairly new at using the ogr bindings.

My thoughts are

1) Am I closing the shapefile properly from the earlier step?

2) Looking at ogr.py 4273, it seems that there is a field type
difference 'Feature_SetFieldInteger64'
vs regular int.


Any pointers on how to move past this would be good. I won't be able to
look at the error till Monday, so I might not be able to answer any follow
up questions till then.




Thanks!

-Mike
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/gdal-dev/attachments/20170422/9ab12784/attachment-0001.html>