[gdal-dev] OGRLayer.Intersection() Question

[Ari Jolma]

On 07/01/2013 10:13 PM, Dheeraj Reddy Mamidi wrote:
> Hi All,
>
> I was trying to perform intersection on two feature classes (shape 
> file format) using OGRLayer.Intersection(),  but have problems making 
> it work with C# bindings. I am not able to figure out on how to pass 
> the arguments SWIGTYPE_p_GDALProgressFunc callback 
> and OSGeo.OGR.SWIGTYPE_p_void callback_data. Can someone please help 
> me figure out on how to handle these. I keep getting the error 
> "Attempt to dereference null GDALProgressFunc". I am not sure what 
> that means.

I don't know the details of C# bindings but the callback function and 
the callback data are by default NULL and you should be able to just 
ignore them, i.e., not supply any arguments.

Ari

>
> Please share an example on how to call Intersection routine or some 
> other routine which takes above mentioned argument types.
>
> Thank you,
> Dheeraj Reddy Mamidi
>
>
>
>
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