[FWTools] Starting with FWTool

[Faizan Tayyab]

Hi,

 Thanks for the help. I am trying to do the following:

map = ogr.Open( str, update = 0 )

where str holds the complete path but

I get the following error:

Traceback (most recent call last):
  File "C:\Python24\My Programs\GISI.py", line 39, in
OnOpen
    x.f(dialog.GetPath())
  File "C:\Python24\My Programs\GISI.py", line 7, in f
    map = ogr.Open( str, update = 0 )
  File "C:\Python24\Lib\site-packages\osgeo\ogr.py",
line 3092, in Open
    return _ogr.Open(*args, **kwargs)
TypeError: in method 'Open', argument 1 of type 'char
const *'

If i hard code the file path liek
c:\something\somthing\.... then it works fine.
Can anyone tell me why the ogr.open doesnt like
variable holding a string as parameter.

--- Frank Warmerdam <warmerdam at pobox.com> wrote:

> Faizan Tayyab wrote:
> > Hi,
> > 
> >  Can anyone provide me with python code (OGR) for
> > reading the geometry of a polygon shapefile. I am
> able
> > to obtain the geomerty reference but am unsure how
> to
> > read the geometry. I am planning to use matplotlib
> to
> > visualize the geometry.
> > 
> > Anyone already done this????
> 
> Faizan,
> 
> I'm not aware of a direct example, but:
> 
>   
>
http://svn.osgeo.org/gdal/trunk/gdal/swig/python/samples/vec_tr.py
> 
> has logic to walk through any kind of geometry that
> might be helpful.
> 
> Basically, a polygon geometry will consist of a top
> level object that
> contains one or more rings accessed using
> geom.GetGeometryRef().  Each
> ring will contain 3 or more points accessed using
> GetX(), and GetY().
> 
> Best regards,
> -- 
>
---------------------------------------+--------------------------------------
> I set the clouds in motion - turn up   | Frank
> Warmerdam, warmerdam at pobox.com
> light and sound - activate the windows |
> http://pobox.com/~warmerdam
> and watch the world go round - Rush    | President
> OSGeo, http://osgeo.org
> 
> 



      ____________________________________________________________________________________
Never miss a thing.  Make Yahoo your home page. 
http://www.yahoo.com/r/hs