[gdal-dev] OGRErr OGRLayer::CreateField // cant create fields

[Even Rouault]

Le lundi 22 juillet 2013 22:58:39, Mauro Pisano a écrit :
> Hi guys!
> 
> Im having a problem by using the OGRLayter::CreateField method, it isnt
> creating the field as the description saids :).
> 
> Maybe you can see the error or have an idea to go out of this hole.
> 
> Here are the lines of code:
> 
> *...*
> *...*
> *   OGRLayer* player = pvector->GetLayer(0);*
> 
> *   if (player->GetLayerDefn()->GetFieldIndex(SUR_HOTLINK_FIELD) < 0) {*
>       // If the field doesnt exist, I create it.
> *      OGRFieldDefn field(SUR_HOTLINK_FIELD, OFTString);*
>       // Try to insert it to the table.
> *      if ( player->CreateField(&field, TRUE) == OGRERR_NONE )*
> *         SHOW_ERROR("D:Error trying to create field);*
> *   }*
> *...*
> *...*
> 
> *NOTES:*
> the first line returns me without problems the Working Layer ( I just
>  using just 1 layer to avoid confusions )
> the first IF returns that there arent any SUR_HOTLINK_FIELD in the table (
> that its OK! )
> 
> and de last IF returns that the CreateField gives distinct as OGRERR_NONE.

Mauro,

You didn't really give a lot of context. But several possible causes :
- the datasource is not opened in update mode
- the driver does not support field creation at all

Even

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