[gdal-dev] How does OGRFeature::GetFieldAsDouble handle NULL values

[Paul Meems]

Thanks Nyall,

Looking at the documentation it seems to be what I'm looking for.

Thanks,

Paul

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2017-01-05 23:24 GMT+01:00 Nyall Dawson <nyall.dawson at gmail.com>:

>
>
> On 6 Jan 2017 7:37 AM, "Paul Meems" <bontepaarden at gmail.com> wrote:
>
> We're using GDAL v2.1.2 on Windows.
>
> We use the GDAL library with MapWinGIS to connect to a PostGIS database.
> When the PostGIS table has NULL values in integer, numeric or double
> fields and that data is read the returned values are 0 (zero), which is
> unexpected by us.
>
> We use Feature->GetFieldAsDouble() and Feature->GetFieldAsInteger().
> Am I correct that these function return 0 when the database value is NULL?
> If not our implementation is wrong and I need to continue my search.
> The documentation http://www.gdal.org/classOGRFe
> ature.html#ab8a57c94e8bb8ffac5e7048d896254b4 doesn't say either way.
>
>
> Try Feature->IsFieldSet(...)
>
> http://www.gdal.org/classOGRFeature.html#a7ad01c76b7b13bcf9eab5092aacac5fb
>
> That should return false for null values.
>
> Nyall
>
>
> Thanks,
>
> Paul
>
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