Mapscript - PostGis Error

Question

I'm doing a spatial query, but I always get an error:

"msPOSTGISLayerGetShape(): Query error. msPOSTGISLayerGetShape called on unopened layer (layerinfo = NULL)"

This is my code:

layerObj layerUtbs = Util.MSMap.getLayerByName("Utbs");
if (layerUtbs.queryByRect(Util.MSMap, rect) == (int)MS_RETURN_VALUE.MS_SUCCESS)
{
 resultCacheObj resultado = layerUtbs.getResults();
 if (resultado.numresults > 0)
 {
 // here i got a error.
 layerUtbs.getFeature(resultado.getResult(0).shapeindex, resultado.getResult(0).tileindex);
 }
}

Here's my map file configuration

LAYER 
 CONNECTIONTYPE postgis 
 NAME "Utbs" 
 CONNECTION "user=pmc dbname=SiteInovacao host=localhost password=123 port=5432"
 PROCESSING "CLOSE_CONNECTION=DEFER" 
 DATA "geom from (SELECT *, oid FROM pmc.utbs) as utbs using unique oid using srid=31983"

Answer 1

Its basically telling you whats wrong- you have not 'opened' the layer Try this:

if (resultado.numresults > 0)
 {
 // Open layer
 layerUtbs.open();
 // here i got a error (you shouldn't now);.
 layerUtbs.getFeature(resultado.getResult(0).shapeindex, resultado.getResult(0).tileindex);
 }
 }