public int GetNumAxles(int unitIndex) { int retNumAxles = 0; if (IntPtr.Zero != VsVehicleHandle) { Check(VS_Vehicle.IsValidVehicle(VsVehicleHandle)); if (VS_Vehicle.IsOk(VsVehicleHandle)) { retNumAxles = (int)VS_Vehicle.GetNumAxles(VsVehicleHandle, unitIndex); } } return(retNumAxles); }