validateGetDescription

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

[DllImport(ifcenginedll, EntryPoint = "validateGetDescription")]
public static extern IntPtr validateGetDescription(int_t issue);

public static string validateGetDescriptionString(int_t issue)
        {
            IntPtr descr = validateGetDescription(issue);
            return System.Runtime.InteropServices.Marshal.PtrToStringAnsi(descr);
        }