[Gdal-dev] OGR:GetNextFeature() throws exception in WINXP

[Vidhiyadharan Nadarajah]

Hi,

Iam a begineer in this field. I have been using OGR for the past 6 months.
I have built a windows application (using VC++) which is runing perfectly
fine in WIN2K.
I have built this application based on the sample provided in the OGR
Tutorial (http://gdal.maptools.org/ogr/ogr_apitut.html). Reading a point
layer is alone described in the tutorial and i have added some code for
reading the polygon layer.
My problem is the same application crashes in WinXP. The function
"poLayer->GetNextFeature()" throws an exception in winXP.Iam unable to find
the exact exception.

I have compiled GDAL1.3.0 and PROJ4 and linking the DLL in my application.
Please find below the piece of code that Iam using. Please help me to find
out the mistake that Iam doing. I can also send the VC++ workspace and the
shape file, if it is needed for finding out the problem.


#include "stdafx.h"
#include "ogrsf_frmts.h"

int main()
{

    OGRRegisterAll();
    OGRDataSource       *poDS;
    poDS = OGRSFDriverRegistrar::Open( "C:\ind.shp", FALSE );
    if( poDS == NULL )
    {
        printf( "Open failed.\n%s" );
        exit( 1 );
    }

    OGRLayer  *poLayer;
    poLayer = poDS->GetLayerByName( "india_ds" );
    OGRFeature *poFeature;
    poLayer->ResetReading();
    while( (poFeature = poLayer->GetNextFeature()) != NULL )
    {
        OGRFeatureDefn *poFDefn = poLayer->GetLayerDefn();
        int iField;

        for( iField = 0; iField < poFDefn->GetFieldCount(); iField++ )
        {
            OGRFieldDefn *poFieldDefn = poFDefn->GetFieldDefn( iField );

            if( poFieldDefn->GetType() == OFTInteger )
                printf( "%d,", poFeature->GetFieldAsInteger( iField ) );
            else if( poFieldDefn->GetType() == OFTReal )
                printf( "%.3f,", poFeature->GetFieldAsDouble(iField) );
            else if( poFieldDefn->GetType() == OFTString )
                printf( "%s,", poFeature->GetFieldAsString(iField) );
            else
                printf( "%s,", poFeature->GetFieldAsString(iField) );
        }

        OGRGeometry *poGeometry;
        poGeometry = poFeature->GetGeometryRef();

        if( poGeometry != NULL
            && wkbFlatten(poGeometry->getGeometryType()) == wkbPoint )
        {
            OGRPoint *poPoint = (OGRPoint *) poGeometry;

            printf( "%.3f,%.3f\n", poPoint->getX(), poPoint->getY() );
        }
        else
        {
            printf( "no point geometry\n" );
        }


        if( poGeometry != NULL
            && wkbFlatten(poGeometry->getGeometryType()) == wkbPolygon )
        {
 			OGRPolygon *poPolygon = (OGRPolygon *)poGeometry ;
			OGRLinearRing *poLinearRing ;
			poLinearRing = poPolygon->getExteriorRing();
			OGRPoint *poPoint = (OGRPoint *) poGeometry;

			int i2 ;
			int i3  = poLinearRing->getNumPoints();
			for(i2=0;i2<i3;i2++){
				poLinearRing->getPoint(i2,poPoint);
				printf( "%.3f,%.3f\n", poPoint->getX(), poPoint->getY() );
			}
        }
        else
        {
            printf( "no polygon geometry\n" );
        }

    //OGRFeature::DestroyFeature( poFeature );
    }
	OGRFeature::DestroyFeature( poFeature );
    OGRDataSource::DestroyDataSource( poDS );
	return 0;
}

Best Regards,
N.Vidhiyadharan



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