[gdal-dev] Delete Feature

Hema Yeedunuri hema.yeedunuri at amigooptima.in
Mon Feb 16 04:10:57 PST 2015


all,

If i want to update every time the layer every time how can it be done? I
want to do undo redo operations on adding and deleting features .

thanks,
hema

On Mon, Feb 16, 2015 at 2:47 PM, Even Rouault <even.rouault at spatialys.com>
wrote:

> Le lundi 16 février 2015 10:07:35, Hema Yeedunuri a écrit :
> > hi all,
> >
> > I am trying to delete feature from shape layer using feature id.the
> feature
> > id is deleted when deleted in order descending order.When trying to
> delete
> > randomly it is giving error message
>
> Hema,
>
> REPACK will remove destroyed features, so it will modify the feature ids of
> the features after the deleted one(s). This might explain that you get
> failures if you REPACK after each deletion (wich will be inefficient, you
> should
> do it just after having deleted all features) if you've determined the
> feature
> ids before.
> Note: the below code is more complicated than necessary: you just need to
> call
> DeleteFeature(actualIndex), no need to NULLify its geometry before.
>
> Even
>
>
> > if i delete fid = 1, the below error is shown.
> >
> > ERROR 1: Attempt to read shape with feature id (2) out of available
> range.
> >
> > this is what i am doing
> >
> >  OGRFeature *delFeatur = poLayer->GetFeature(actualIndex);
> >
> >  delFeatur->SetGeometryDirectly(NULL);
> >   poLayer->SetFeature(delFeatur);
> >   poLayer->DeleteFeature(actualIndex);
> >
> >   OGRFeature::DestroyFeature( delFeatur );
> >
> >  QString sql = QString( "REPACK %1" ).arg( poLayer->GetName() );
> >  reader->ExecuteSQL(sql.toLatin1().data(),NULL,NULL);
> >
> > poLayer->SyncToDisk();
> >
> > reader->SyncToDisk();
> >
> >
> >
> > thanks,
> >
> > hema
>
> --
> Spatialys - Geospatial professional services
> http://www.spatialys.com
>
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