如何加载二进制模块

Question

Next compiles well

-module(cipher_id).
-export([a1/1]).

a1(I) ->
    binary:encode_unsigned(I).

But then i try to call cipher_id:a1(I) it crashes with

** exception error: undefined function binary:encode_unsigned/1

The same happened if try to call function from binary module in erl shell. m() outputs lists in which no binary module present.

Answer 1

From the Erlang documentation of the binary module :

The module is implemented according to the EEP (Erlang Enhancement Proposal) 31.

From the proposal page :

Status: Final/R14A Proposal is implemented in OTP release R14A

You're using R13B03. My feeling is that you need to upgrade to a newer Erlang installation. Binaries for Ubuntu are available at:

http://www.erlang-solutions.com/section/132/erlang-otp-packages