[Gdal-dev] easy ogr question...

[Will Cadell]

Thanks Frank,

No message I'm afraid but there are features, and I was wondering how
ogr would handle and 'empty' column. I assumed it would add nulls, but
hey ho seems like I'll have to make a new shapefile, copy the layer
definition then add the field then copy all the features to a new
shapefile... Does seem a bit cumbersome though... is there a better way
people can think of?

will

Frank Warmerdam wrote:
> Will Cadell wrote:
>> hi guys... am i just stupid or is there another way to add a field to a
>> shapefile other than:
>>        ds = ogr.open("c:\shapefile.shp", True)
>>        new_field = ogr.FieldDefn()
>>     new_field.SetName(new_field_name)
>>     new_field.SetType(new_field_type)
>>     new_field.SetWidth(new_field_width)
>>        layer = ds.GetLayer(0)
>>     layer.CreateField(new_field)
>>        ds.destroy
>>
>> because this doesn't work for me...
>
> Will,
>
> This does seem like the correct approach.  Are there any features in the
> shapefile already?  I'm pretty sure that adding a field only works when
> there are no features yet.  If you aren't getting an error message then
> there is a clear bug here, and a bug report in bugzilla would be
> appreciated.
>
> Best regards,

-- 
Will Cadell
Remote Sensing and GIS Analyst

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