Returns the number of cells in an array
long GetVectorCount2( ) const;
This function returns the total number of cells contained in an CXlOper.
Use this function with VectorCell() to iterate the cells in a vector.
If the CXlOper is not a vector (i.e. contains more than row and more than column) then the return value may be subject to overflow (because it is greater than 2^32) and will therefore be unreliable.