[gdal-dev] Using OGRLayer::GetNextFeature() to read Dgn file ?

[taibc]

Hi everyone,

I am trying read features in a dgn file and convert to shape file.
Everything is ok before I adding the last while loop. After adding this
while loop, I can't exit the program. Please see my below codes.

Do you know why ?

OGRRegisterAll();
OGRDataSource       *poDS,  *poSHPDS;
OGRLayer  *poLayer;
poLayer = poDS->GetLayer(0);
...
OGRFeature *poFeature;
while( (poFeature = poLayer->GetNextFeature()) != NULL )
{
    OGRGeometry *poGeometry;
    poGeometry = poFeature->GetGeometryRef();
    if( poGeometry != NULL && (wkbFlatten(poGeometry->getGeometryType()) ==
wkbPolygon) && (poFeature->GetFieldAsInteger ("Level") == 62) 
                && (strstr(poFeature->GetStyleString (), "BRUSH") != NULL))

    {
         poLayer->SetSpatialFilter(poGeometry); 
         // .............
         // .............
         OGRFeature *poTempFeature; 

         while((poTempFeature = poLayer->GetNextFeature()) != NULL)
         {
             if ((poTempFeature->GetGeometryRef () != NULL) &&
(poTempFeature->GetGeometryRef()->getGeometryType() == wkbPolygon)
                        && (strstr(poTempFeature->GetStyleString (),
"BRUSH") != NULL)
                        && poTempFeature->GetGeometryRef
()->Within(poGeometry) 
             {
                  poLayer->SetSpatialFilter(poTempFeature->GetGeometryRef
()); 
                  .....
                  OGRFeature *poSubFeature; 


                  while ((poSubFeature = poLayer->GetNextFeature ()) !=
NULL)
                  {
                       // do something 
                       // Can't exit the programe after adding this while
loop 
                  }
             }
         }
    }

}

Thanks and regards,

Tai



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