j接口创建外部Erlang术语 [英] jInterface to create External Erlang Term

问题描述

如何格式化以下erlang术语：

  {atom，message} 
  

在jInterface中，我可以在erlang shell中调用外部格式

  erlang：binary_to_term（Binary）
  

示例：
注意，由于元组将通过网络发送，我通过转换为byte []完成。

  OtpErlangObject [] msg = new OtpErlangObject [2]; 
 msg [0] = new OtpErlangAtom（atom）; 
 msg [1] = new OtpErlangString（message）; 
 
 OtpErlangTuple reply = new OtpErlangTuple（msg）; 
 
 OtpOutputStream stream = new OtpOutputStream（reply）; 
 
 stream.toByteArray（）//我通过net发送的字节[] 
  

Erlang收到的二进制文件是：

  B =<< 104,2,100,0,4,97,116,111,109,107,0 ，7,109,101,115,115,97,103,101>> 
  

然后在一个erlang shell中将接收到的术语转换为二进制给出一个badarg。

  binary_to_term（B）。 
 **异常错误：函数中的
函数binary_to_term / 1 
称为binary_to_term（<< 104,210,70,4,97,116,111,109,107,0,7,109，
 $ 100 $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $¬$>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>  binary_to_term（< 131,104,2,107,0,4,91,116,111,109,107,0,7,109,101,115,115,97,103,101>>）。 
 {atom，message} 
  

似乎该邮件缺少term_to_binary需要131个标签。从Java输出可以看出，这个标签没有被jinterface编码添加。如果我只是添加131到二进制的开始，它正确解码。

现在为什么Java不添加它？

我仍然会接受答案，因为我还没有正式回答我的问题（以支持的方式，即不用131进行黑客入侵）

参考：

http://www.erlang.org/doc/apps/erts/erl_ext_dist.html

How can I format the the following erlang term:

{ atom, "message" }

In jInterface to an external format that I may call in an erlang shell

erlang:binary_to_term( Binary )

Example: Note that since the tuple will be sent over the net, I finish by converting to byte[].

OtpErlangObject[] msg = new OtpErlangObject[2];
msg[0] = new OtpErlangAtom( "atom" );
msg[1] = new OtpErlangString( "message" );

OtpErlangTuple reply = new OtpErlangTuple(msg);

OtpOutputStream stream = new OtpOutputStream(reply);

stream.toByteArray()    // byte[] which I send over net

The binary received by Erlang is:

B = <<104,2,100,0,4,97,116,111,109,107,0,7,109,101,115,115,97,103,101>>

Then in an erlang shell converting the received term to binary gives a badarg.

 binary_to_term( B ).                                                     
** exception error: bad argument
     in function  binary_to_term/1
        called as binary_to_term(<<104,2,107,0,4,97,116,111,109,107,0,7,109,
                                   101,115,115,97,103,101>>)

解决方案

binary_to_term( <<131,104,2,107,0,4,97,116,111,109,107,0,7,109,101,115,115,97,103,101>> ).
{"atom","message"}

It seems that the message is missing the 131 tag required by term_to_binary. As is evident from the Java output, this tag is not being added by jinterface encode. If I simply add 131 to the beginning of the binary it decodes correctly.

Now why is Java not adding it?

I will still accept answers as I have not officially answered my question ( in a supported way ie. not hacking with 131 )

Ref:

http://www.erlang.org/doc/apps/erts/erl_ext_dist.html

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