[gdal-dev] PointOnSurface returning (0, 0, 0)

[Reynolds, Scott]

Hi,

I'm trying to use PointOnSurface but get (0, 0, 0) no matter what geometry I use.  I'm using the MapServer libraries from gisinternals.com.  One thing I'm seeing is osgeo::proj::io::FactoryException being thrown when I call SetWellKnownGeogCS("WGS84").  Any ideas what I'm doing wrong?

Thanks,
Scott

#include <iostream>

#include "ogrsf_frmts.h"
#include "ogr_geometry.h"

static void CPL_STDCALL CplErrorHandler(CPLErr cplErr, int nError, char* pszErrorTxt) {
    std::cout << "GDAL(" << nError << "): " << pszErrorTxt << "\n";
}

int main()
{
    (void)_putenv("GDAL_DATA=D:\\Temp\\GeosTest\\gdal\\bin\\gdal-data");
    (void)_putenv("PROJ_DATA=D:\\Temp\\GeosTest\\gdal\\bin\\proj9\\share"); // PROJ 9.1
    (void)_putenv("PROJ_LIB=D:\\Temp\\GeosTest\\gdal\\bin\\proj9\\share"); // pre PROJ 9.1
    (void)_putenv("PROJ_DEBUG=3");

    OGRErr ogrErr;

    CPLSetConfigOption("GDAL_DATA", "D:\\Temp\\GeosTest\\gdal\\bin\\gdal-data");
    CPLSetConfigOption("PROJ_DATA", "D:\\Temp\\GeosTest\\gdal\\bin\\proj9\\share"); // PROJ 9.1
    CPLSetConfigOption("PROJ_LIB", "D:\\Temp\\GeosTest\\gdal\\bin\\proj9\\share"); // pre PROJ 9.1

    CPLPushErrorHandler((CPLErrorHandler)CplErrorHandler);

    GDALAllRegister();

    OGRSpatialReference* pSrs = new OGRSpatialReference();
    pSrs->SetWellKnownGeogCS("WGS84");

    const char* pszWkt = "POLYGON ((-5.0 5.0, 5.0 5.0, 5.0 -5.0, 3.0 -5.0, 3.0 3.0, -5.0 3.0, -5.0 5.0))";

    OGRGeometry* pGeom;
    OGRGeometryFactory::createFromWkt(pszWkt, pSrs, &pGeom);
    OGRPoint pointOnSurface;

    OGRSurface* pSurface = pGeom->toSurface();
    pSurface->PointOnSurface(&pointOnSurface);

    char* pszWkt2;
    pGeom->exportToWkt(&pszWkt2);
    std::cout << pszWkt2 << "\n";
    std::cout << "PointOnSurface = (" << pointOnSurface.getX() << ", " << pointOnSurface.getY() << ")\n";
}

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