how can I get msg_hash?

[fishTsai20]

method 1:
Below is how ton-index(https://github.com/toncenter/ton-index-worker) get msg-hash

trans.r1 struct:
struct Record {
    typedef Transaction_aux type_class;
    Ref<CellSlice> in_msg;  	// in_msg : Maybe ^(Message Any)
    Ref<CellSlice> out_msgs;  	// out_msgs : HashmapE 15 ^(Message Any)
    Record() = default;
    Record(Ref<CellSlice> _in_msg, Ref<CellSlice> _out_msgs) : in_msg(std::move(_in_msg)), out_msgs(std::move(_out_msgs)) {}
  };

Ref<Cell> CellSlice::prefetch_ref(unsigned offset) const {
  if (offset < size_refs()) {
    auto ref_id = refs_st + offset;
    auto res = cell->get_ref(ref_id)->virtualize(child_virt());
    if (!tree_node.empty()) {
      res = UsageCell::create(std::move(res), tree_node.create_child(ref_id));
    }
    return res;
  } else {
    return Ref<Cell>{};
  }
}

auto msg = trans.r1.in_msg->prefetch_ref();
tx_info.in_msg_hash = msg->get_hash().bits();

method 2:
Below is how I get msg-hash with your code

message tlb.Message
msgCell, err := tlb.ToCell(message)
msg.Hash = msgCell.Hash()
hash = base64.StdEncoding.EncodeToString(msg.Hash)

The msg-hash generated by these two methods is different, how can I use your code to get the same msg-hash as ton-index-worker?

[byte1023]

i wanna also know how this tx hash is figured out. plz tell me if u have solved this problem. thank u