[geos-devel] WKTReader and python bindings

[John Cartwright]

Whoa - that was a fast response!  Thanks for the explanation Howard.

-- john

On Mar 9, 2006, at 10:24 PM, Howard Butler wrote:

> John,
>
> SWIG's __del__ implementation is biting you here.  In the second  
> example, the geos.GeometryFactory() goes out of scope and a  
> reference isn't kept alive by Python.  The GDAL guys tease me by  
> calling this incantination a "hobuism" because I like to chain  
> things together like this in Python (that's what it's for, right :)
>
> My only fix for this in the 2.2 series was to go through the  
> geos.py and comment out all of the __del__ implementations and let  
> it leak.
>
> Howard
>
> At 10:19 PM -0700 3/9/06, John Cartwright wrote:
>> Hello All,
>>
>> I'm using the python bindings for version 2.2.1 and am surprised  
>> to find that while
>>
>> gf = geos.GeometryFactory()
>> reader = geos.WKTReader(gf)
>> reader.read(wkt)
>>
>> works fine, the code below segfaults.
>>
>> reader = geos.WKTReader(geos.GeometryFactory())
>> geom = reader.read(wkt)
>>
>> I would have thought the two code snippets would behave  
>> identically - can someone explain why not?
>>
>> Thanks!
>>
>> -- john
>>
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