[gdal-dev] Shapefile read/write

[Mullins, Steven]

Thanks for the quick reply.  I am using GDAL 1.5dev, FWTools 1.3.9, released 2007/10/11 on win32.
I assume since it is a development build, it is the new bindings.

-----Original Message-----
From: Howard Butler [mailto:hobu.inc at gmail.com]
Sent: Mon, December 03, 2007 2:52 PM
To: Mullins, Steven
Cc: gdal-dev at lists.osgeo.org
Subject: Re: [gdal-dev] Shapefile read/write


Which version of GDAL?
Which bindings are you using, next-gen or old-gen?

On Dec 3, 2007, at 1:41 PM, Mullins, Steven wrote:

> I have written this short python program to update the northing and  
> easting datafields of a shapefile with the point locations for each  
> point.  I need to write this data back to the same shapefile.  Doing  
> a .Destroy() does not write back to the file.  I assume ogr.Open is  
> read only.  Is there a way to open a file read/write and write the  
> changes back when closing or Destroying?  Do I have to open a new  
> file and iterate over all the fields and points and write to a new  
> file?
>
> Thanks,
>
> Steve
>
> ###############################################
> #!/usr/local/bin/python
> #
>
> import ogr
> import osr
> import string
>
> ###############################################
> # Data Source
> data_source = ogr.Open('./shapefiles83/rainfalls-active/rainfalls- 
> active.shp', update = 1)
> layer_0 = data_source.GetLayer(0)
> ###############################################
>
>
>
> current_feature = layer_0.GetNextFeature()
>
> while current_feature is not None:
>
>    current_point = current_feature.GetGeometryRef()
>
>    # update coords from point X,Y
>    current_feature.SetField ( 0, current_point.GetX())
>    current_feature.SetField ( 1, current_point.GetY())
>
>    current_feature = layer_0.GetNextFeature()
>
> data_source.Destroy()
> ####################################################
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