This call returns a declaration handle of the select element with the given index (zero based) It returns 0 if the index out of range


public const string ifcenginedll = @"ifcengine.dll";

[DllImport(IFCEngineDLL, EntryPoint = "engiGetSelectElement")]
public static extern Int64 engiGetSelectElement(Int64 select, Int64 index);    

Property select

Size: 64 bit / 8 byte (value)

Property index

Size: 64 bit / 8 byte (value)