Elixir marshal ISO 8583 消息错误与 Erlang 库

我是长生不老药的新手，我需要用这种语言和凤凰框架创建ISO 8583客户端。我从这里的stackoverflow线程中找到了一个Erlang库，成功编译并遵循了此处存储库中的示例，但在封送消息时出现错误。这是我的 Elixir 代码来封送消息：

msg1 = :erl8583_message.new()
msg2 = :erl8583_message.set_mti("0800", msg1)
msg3 = :erl8583_message.set(3, "300000", msg2)
msg4 = :erl8583_message.set(24, "045", msg3)
msg5 = :erl8583_message.set(41, "11111111", msg4)
msg6 = :erl8583_message.set(42, "222222222222222", msg5)
msg7 = :erl8583_message.set(63, "This is a Test Message", msg6)
marshalled = :erl8583_marshaller_ascii.marshal(msg7)

这只是存储库示例中的灵丹妙药版本。这是我在运行应用程序时遇到的错误：

[error] #PID<0.438.0> running TestlangIsoClientWeb.Endpoint (cowboy_protocol) terminated
Server: 127.0.0.1:4001 (http)
Request: POST /api/process
** (exit) an exception was raised:
** (FunctionClauseError) no function clause matching in :erl8583_marshaller_ascii.marshal_data_element/2
(erl8583) /home/muhammad/Workspace/testlang/testlang_iso_client/deps/erl8583/src/erl8583_marshaller_ascii.erl:168: :erl8583_marshaller_ascii.marshal_data_element({:n, :fixed, 4}, "0800")
(erl8583) /home/muhammad/Workspace/testlang/testlang_iso_client/deps/erl8583/src/erl8583_marshaller.erl:108: :erl8583_marshaller.marshal/2
(testlang_iso_client) lib/testlang_iso_client_web/controllers/my_controller.ex:61: TestlangIsoClientWeb.MyController.process/2
(testlang_iso_client) lib/testlang_iso_client_web/controllers/my_controller.ex:1: TestlangIsoClientWeb.MyController.action/2
(testlang_iso_client) lib/testlang_iso_client_web/controllers/my_controller.ex:1: TestlangIsoClientWeb.MyController.phoenix_controller_pipeline/2
(testlang_iso_client) lib/testlang_iso_client_web/endpoint.ex:1: TestlangIsoClientWeb.Endpoint.instrument/4
(phoenix) lib/phoenix/router.ex:278: Phoenix.Router.__call__/1
(testlang_iso_client) lib/testlang_iso_client_web/endpoint.ex:1: TestlangIsoClientWeb.Endpoint.plug_builder_call/2
(testlang_iso_client) lib/testlang_iso_client_web/endpoint.ex:1: TestlangIsoClientWeb.Endpoint.call/2
(plug) lib/plug/adapters/cowboy/handler.ex:16: Plug.Adapters.Cowboy.Handler.upgrade/4
(cowboy) /home/muhammad/Workspace/testlang/testlang_iso_client/deps/cowboy/src/cowboy_protocol.erl:442: :cowboy_protocol.execute/4

我错过了什么让它工作吗？任何帮助将不胜感激。

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我尝试将字符串参数更改为字符列表，但仍然收到相同的错误。以下是代码片段：

def test(conn, _params) do
IO.puts("Test")
msg1 = :erl8583_message.new()
msg2 = :erl8583_message.set_mti('0800', msg1)
msg3 = :erl8583_message.set(3, '300000', msg2)
msg4 = :erl8583_message.set(24, '045', msg3)
msg5 = :erl8583_message.set(41, '11111111', msg4)
msg6 = :erl8583_message.set(42, '222222222222222', msg5)
msg7 = :erl8583_message.set(63, 'This is a Test Message', msg6)
marshalled = :erl8583_marshaller_ascii.marshal(msg7)
json(conn, %{status: "ok"})
end

下面是堆栈跟踪中提到的erl8583_marshaller.erl:108函数：

marshal(Message, MarshalHandlers) ->
OptionsRecord = parse_options(MarshalHandlers, #marshal_options{}),
{Marshalled1, Message1} = init_marshalling(OptionsRecord, Message),
MarshalledMti = encode_mti(OptionsRecord, Message1),  % --- Line 108
Marshalled2 = <<Marshalled1/binary, MarshalledMti/binary>>,
{MarshalledBitmap, Message2} = encode_bitmap(OptionsRecord, Message1),
Marshalled3 = <<Marshalled2/binary, MarshalledBitmap/binary>>,
MarshalledFields = encode_fields(OptionsRecord, Message2),
Marshalled4 = <<Marshalled3/binary, MarshalledFields/binary>>,
end_marshalling(OptionsRecord, Message2, Marshalled4).

这是堆栈跟踪中提到的erl8583_marshaller_ascii.erl:168函数：

%%
%% Local Functions
%%
marshal_data_element({n, llvar, Length}, FieldValue) when length(FieldValue) =< Length ->
erl8583_convert:integer_to_string(length(FieldValue), 2) ++ FieldValue;

我不明白为什么对该函数的调用无法与从我的函数发送{:n, :fixed, 4}, "0800"参数匹配。我试图将双引号更改为单引号，但没有成功。还有其他建议我应该怎么做吗？

代码中可能存在错误。您可以在此处参考此问题

有一个比较新的丹药库。

它被称为ALE8583。

关于这个的文档仍在发布，但看起来非常有希望。

你可以看看。

尝试传递字符列表而不是字符串：

msg1 = :erl8583_message.new()
msg2 = :erl8583_message.set_mti('0800', msg1)
msg3 = :erl8583_message.set(3, '300000', msg2)
msg4 = :erl8583_message.set(24, '045', msg3)
msg5 = :erl8583_message.set(41, '11111111', msg4)
msg6 = :erl8583_message.set(42, '222222222222222', msg5)
msg7 = :erl8583_message.set(63, 'This is a Test Message', msg6)
marshalled = :erl8583_marshaller_ascii.marshal(msg7)

这里可能会造成混淆：

Erlang称之为"字符串"并放入双引号(

"foo"(，Elixir称为"charlists"并放入单引号('foo'(。
Elixir称之为"字符串"并放入双引号("foo"(，Erlang称为"二进制"并放入双引号加尖括号(<<"foo">>(。

似乎 erl8583 库始终期望 Erlang 字符串。

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