Hi all;
Using the GDAL/OGR library, I made a module which extracts the depth points
from the sounding and contour layers of an ENC file.
Everything works perfect if this module is used in a non-MFC project
(btw, projects are compiled with VS 2008) However, when the module is moved
to an MFC-based project, sounding point values (x, y, and z) come as abnormal
values, whereas no problem occurs with the values that come from the
contour layer.
I know that this can possibly originate from different heaps (GDAL dll vs. MFC),
however I wrote the code so that all pointers are created, handled, and finally
destroyed by the GDAL library. Should I not expect a possible heap
corruption problem
here ?
Here, first I insert all features in a vector:
OGRFeature *poFeature = NULL;
m_poLayerRef = poDS->GetLayerByName( "SOUNDG" );
m_poLayerRef->ResetReading();
std::vector<OGRFeature*> m_features;
while( (poFeature = m_poLayerRef->GetNextFeature() ) != NULL )
{
OGRGeometry *poGeometry = poFeature->GetGeometryRef();
assert( poGeometry != NULL );
if ( poGeometry != NULL )
{
if ( wkbFlatten(poGeometry->getGeometryType()) == wkbPoint)
{
m_features.push_back(poFeature);
}
else
OGRFeature::DestroyFeature(poFeature);
}
else
OGRFeature::DestroyFeature(poFeature);
}
Then, I insert all the points to another structure as follows:
for (std::vector<OGRFeature*>::iterator it = m_features.begin(); it
!= m_features.end(); it++)
{
poFeature = (*it);
poGeometry = poFeature->GetGeometryRef();
assert( (poGeometry != NULL) && (
wkbFlatten(poGeometry->getGeometryType()) == wkbPoint ) );
if ( (poGeometry != NULL) && (
wkbFlatten(poGeometry->getGeometryType()) == wkbPoint ) )
{
x = ( ((OGRPoint *)poGeometry)->getX() );
y = ( ((OGRPoint *)poGeometry)->getY() );
z = ( ((OGRPoint *)poGeometry)->getZ() );
depthMap.Insert( x, y, z );
}
}
As another question, I do the following simple operation (again in MFC):
OGRSpatialReference *poSRS = new OGRSpatialReference;
OGRSpatialReference::DestroySpatialReference(poSRS);
and I get heap corruption error. Do we have another way to create a
spatial reference system object for this purpose?
Best regards,
Yilmaz
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