Error returned from IWkb::ExportToWkb() method

BobCave

Hello,

I am using the IWkb interface to read data from a geometry.  When reading from a file or personal geodatabase, I get the following result:  HR=-2147220968 (E_GEOMETRY_NOTSIMPLE).  When I call ITopologicalOperator::get_IsSimple(), it returns true.  Does anyone know how a geometry can be both simple and non-simple?

Here is the code I am using:

esriGeometry::ITopologicalOperatorPtr topoOp = pGeo; // pGeo initialized earlier   if (topoOp != NULL) {     VARIANT_BOOL isSimple = VARIANT_TRUE;     hr = topoOp->get_IsSimple(&isSimple);  // returns 'true' for the geometry in question       if (VARIANT_FALSE == isSimple)     {         // Simplifies the geometry in place         hr = topoOp->Simplify();     } }   esriGeometry::IWkbPtr ipWkb = pGeo;   long reqSize = 0;  if (FAILED(hr = ipWkb->get_WkbSize(&reqSize))) {     return false; }  esriGeometry::esriGeometryType aoGeoType; hr = pGeo->get_GeometryType(&aoGeoType); unsigned char* pInOutWorkingBuffer = new unsigned char[reqSize];  if (FAILED(hr = ipWkb->ExportToWkb(&reqSize, pInOutWorkingBuffer))) {     // Fails here with hr=-2147220968     return false; }

One other note: the geometry that fails is the first one in the feature class.  The WKB size is 59629.  Is there a limitation on the size of a WKB buffer?

I am using ArcGIS 10.1, ArcObjects C++, Visual Studio 2008.

Thanks,

Bob

NeilClemmons_GISinc

In order to simplify a geometry, you must use ITopologicalOperator2 and set IsKnownSimple to False.  After that, calling Simplify will simplify the geometry.  If you call Simplify without first setting IsKnownSimple to False, it will exit without doing anything if IsSimple returns true.  IsSimple pretty much returns True all of the time, which is the reason IsKnownSimple was added to the object model.  I don't know that it will solve your problem, but give it a try.