[gdal-dev] Create new fields in existing shapefile with Python

[Chaitanya kumar CH]

Alexander,

This has been fixed in http://trac.osgeo.org/gdal/ticket/3247
Use the latest version 1.7 overcome this issue. It was not incorporated in
1.6 branch.

On Thu, Apr 29, 2010 at 10:39 PM, Alexander Bruy
<alexander.bruy at gmail.com>wrote:

> Hi all,
>
> when writing a script in Python for processing shapefiles I found
> that I can add to the shapefile new fields with the same name many
> times without any error or warning. But AFAIK all fields in shapefile
> must have unique field names. Is this a bug and I need to post a
> ticket? Or maybe I do something wrong?
>
> Here is code
>
> #!/usr/bin/env python
> # -*- coding: utf-8 -*-
>
> try:
>  from osgeo import ogr
> except ImportError:
>  import ogr
>
> import sys
>
> def createField( inLayer, fieldName ):
>  fieldDef = ogr.FieldDefn( fieldName, ogr.OFTReal )
>  fieldDef.SetWidth( 12 )
>  fieldDef.SetPrecision( 4 )
>  if inLayer.CreateField( fieldDef ) != 0:
>    print "Can't create field %s" % fieldDef.GetNameRef()
>    return False
>  return True
>
> if __name__ == '__main__':
>  args = sys.argv[ 1: ]
>  filePath = args[ 0 ]
>  inShape = ogr.Open( filePath, True )
>  if inShape is None:
>    print 'Unable to open shapefile', filePath
>    sys.exit( 1 )
>
>  inLayer = inShape.GetLayer( 0 )
>  for i in range( 3 ):
>    name = 'new_field'
>    if not createField( inLayer, name ):
>      print 'ERROR'
>      sys.exit( 1 )
>
> Script get from commandline path to any shapefile and adds to it
> 4 new fields with same name.
> My software GDAL/OGR 1.6.3 with Python 2.5.2 under Linux.
>
> Thanks
> --
> Alexander Bruy
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> gdal-dev at lists.osgeo.org
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>



-- 
Best regards,
Chaitanya kumar CH.
/tʃaɪθənjə/ /kʊmɑr/
+91-9848167848
17.2416N 80.1426E
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