[FWTools] CreateField on existing shape file

[Frank Warmerdam]

Bijoy Nair wrote:
> Hi,
> I am trying to add a new field on an existing shape file using ogr 
> python bindings but it seems to fail. The same steps work correctly when 
> a new shape file is created and a field is added to it.
> 
>  >>> from gdal import ogr
>  >>> ds = ogr.Open('d:/temp/delete-dublin-shapes',update = 1)
>  >>> lyr = ds.GetLayerByName('Zones')
>  >>> field = ogr.FieldDefn('Project',ogr.OFTString)
>  >>> field.SetWidth(100)
>  >>> lyr.CreateField(field)
> 6

Bijoy,

I believe the OGR Shapefile driver does not support creating fields on
a shapefile that already has records.  Is that the case for you?

Best regards,
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