[gdal-dev] Delete Feature

[Even Rouault]

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

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