halcon如何判断HObject/HTuple为空

//halcon判断图像HObject是否为空
HObject ho_Null;
gen_empty_obj(&ho_Null);
if (!ho_ImageResult.IsInitialized())//IsInitialized只能用来判断图像有无初始化,不能判断图像空不空或有没有
{
  return;
}
HTuple hv_n;
test_equal_obj(ho_ImageResult, ho_Null, &hv_n);
if (hv_n == 1)//两个Obj相等
{
  return;
}

HTuple htCh = HTuple();
HTuple hv_Length;
TupleLength(htCh, &hv_Length);
if (hv_Length.I() == 0)
{
  return true;
}