[FWTools] AttributeError: 'NoneType' object has no attribute 'GetGeometryRef'

[Susana Iraiis Delgado Rodriguez]

Hello members:

I start developing a python module to generate a file which will contain
some attributes from a shapefile. My code is:

import os
from xlwt import Workbook
from osgeo import ogr
import time

#This is for a kind of crawler into my system:
file_list = []
folders = None
 # look in this (root) folder for files with specified extension
for root, folders, files in os.walk( "C:\\" ):
     file_list.extend(os.path.join(root,fi) for fi in files if
fi.endswith(".shp"))

#Create the excel file
wrkbk = Workbook()
 #Add named parameter to allow overwriting cells: cell_overwrite_ok=True
wksht = wrkbk.add_sheet('shp')
wksht.row(0).write(0,'ruta')
wksht.row(0).write(1,'archivo')
wksht.row(0).write(2,'x_min')
wksht.row(0).write(3,'y_min')
wksht.row(0).write(4,'x_max')
wksht.row(0).write(5,'y_max')
wksht.row(0).write(6,'geometria')
wksht.row(0).write(7,'num_elem')
wksht.row(0).write(8,'prj')
wksht.row(0).write(9,'estrutura bd')
wksht.row(0).write(10,'extent')
wksht.row(0).write(11,'fecha_modificacion')
wksht.row(0).write(12,'maquina_host')

Start fiiling the cells with data
for row, filepath in enumerate(file_list, start=1):
 #Fill cells with the path
      wksht.row(row).write(0, filepath)
 #Do the featurecount()
      shapeData = ogr.Open(filepath)
      layer = shapeData.GetLayer()
      feature = layer.GetNextFeature()
      wksht.row(row).write(7, layer.GetFeatureCount())
 #Here is the problem, when I want to get the geometry name,
      geometry = feature.GetGeometryRef()
      geometryType = geometry.GetGeometryName()
      wksht.row(row).write(6, geometryType)
 #

wrkbk.save('shp.xls')

When the module gets to the geometryName part, ti throws me the error:
Python 2.6.6 (r266:84297, Aug 24 2010, 18:46:32) [MSC v.1500 32 bit (Intel)]
on
win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import excel_craw
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "excel_craw.py", line 45, in <module>
    geometry = feature.GetGeometryRef()
AttributeError: 'NoneType' object has no attribute 'GetGeometryRef'
>>>

I don't undestand the reason of the error, because I run the next lines in
IDLE Python an this is what I got:
>>> import os
>>> from osgeo import ogr
>>> shapeData = ogr.Open('tapalpa_05_plani_point.shp')
>>> layer = shapeData.GetLayer()
>>> feature = layer.GetNextFeature()
>>> geometry = feature.GetGeometryRef()
>>> geometryType = geometry.GetGeometryName()
>>> print geometryType
POINT

Why is my other code wrong?
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