Le dimanche 20 mars 2011 23:47:44, Mike Toews a écrit :
> Ok, I found the issue. Rather than adding a new field def'n:
> layer_defn.AddFieldDefn(new_field)
>
> it needs to instead be created on the layer:
> layer.CreateField(new_field)
>
> The documentation is misleading, as I thought I couldn't
Ok, I found the issue. Rather than adding a new field def'n:
layer_defn.AddFieldDefn(new_field)
it needs to instead be created on the layer:
layer.CreateField(new_field)
The documentation is misleading, as I thought I couldn't add a field
to an existing shapefile if there were features in it. I w
Mike,
A new field cannot be added to a feature definition while there are any
features based on that feature definition.
See the docs for OGRFeatureDefn::AddFieldDefn()
http://www.gdal.org/ogr/classOGRFeatureDefn.html#40e681d8464b42f1a1fac655f16ac3dd
On Fri, Mar 18, 2011 at 11:01 AM, Mike Toews
In a Python script, I am updating an exiting shapefile with data by
adding a column. However, my changes don't seem to be saved. Here is
what I have:
from osgeo import ogr
obs_file = 'myfile.shp'
source = ogr.Open(obs_file, 1)
layer = source.GetLayer()
layer_defn = layer.GetLayerDefn()
new_field
