Bad Argument, (Bug or something I'm missing). - Erlang Programming

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Message from discussion Bad Argument, (Bug or something I'm missing).
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Date: Mon, 1 Oct 2012 03:46:51 -0500
Message-ID: <CAPTXyXcfPi_t0gn5pyRrRXkXPYuotjEKfpPdNaisfJ82Kz7...@mail.gmail.com>
From: Jesse Gumm <g...@sigma-star.com>
To: Chris Cook <cookchr...@gmail.com>
Cc: erlang-questi...@erlang.org
Subject: Re: [erlang-questions] Bad Argument, (Bug or something I'm missing).
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Hi,

You just need to convert List to a binary first with list_to_binary.

The <<"something">> syntax is just a friendly way to make binary literals.
But it does not perform automatic casting of lists.

Further, the extra << >> you're wrapping around "-" is unnecessary.

Example:

> L = "123456",
> B = list_to_binary(L),
> <<B/binary,"-">>.

Will yield:

<<"123456-">>

Hope that helps.

Take it easy,

-Jesse

--
Jesse Gumm
Owner, Sigma Star Systems
414.940.4866 || sigma-star.com || @jessegumm
On Oct 1, 2012 3:11 AM, "Chris Cook" <cookchr...@gmail.com> wrote:

> Morning list,
>
> I have,
>
> Erlang R15B01 (erts-5.9.1) [source] [async-threads:0] [hipe]
> [kernel-poll:false]
>
> Eshell V5.9.1  (abort with ^G)
> 1> List = "89234789234jhk2hk234892789fauky324978".
> "89234789234jhk2hk234892789fauky324978"
> 2> <<List, <<"-">>/binary>>.
> ** exception error: bad argument
>
> But when I write it as this,
>
> 3> <<"89234789234jhk2hk234892789fauky324978", <<"-">>/binary>>.
> <<"89234789234jhk2hk234892789fauky324978-">>
>
> I get the result I expected to get from the above 1 & 2. Could someone
> please explain what is going wrong and why, because I'm very confused
> with it.
>
> Regards
>
> Chris Cook.
> _______________________________________________
> erlang-questions mailing list
> erlang-questi...@erlang.org
> http://erlang.org/mailman/listinfo/erlang-questions
>

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<p>Hi,</p>
<p>You just need to convert List to a binary first with list_to_binary.</p>
<p>The &lt;&lt;&quot;something&quot;&gt;&gt; syntax is just a friendly way =
to make binary literals. But it does not perform automatic casting of lists=
.</p>
<p>Further, the extra &lt;&lt; &gt;&gt; you&#39;re wrapping around &quot;-&=
quot; is unnecessary.</p>
<p>Example:</p>
<p>&gt; L =3D &quot;123456&quot;,<br>
&gt; B =3D list_to_binary(L),<br>
&gt; &lt;&lt;B/binary,&quot;-&quot;&gt;&gt;.</p>
<p>Will yield:</p>
<p>&lt;&lt;&quot;123456-&quot;&gt;&gt;</p>
<p>Hope that helps.</p>
<p>Take it easy,</p>
<p>-Jesse</p>
<p>--<br>
Jesse Gumm<br>
Owner, Sigma Star Systems<br>
414.940.4866 || <a href=3D"http://sigma-star.com">sigma-star.com</a> || @je=
ssegumm</p>
<div class=3D"gmail_quote">On Oct 1, 2012 3:11 AM, &quot;Chris Cook&quot; &=
lt;<a href=3D"mailto:cookchr...@gmail.com">cookchr...@gmail.com</a>&gt; wro=
te:<br type=3D"attribution"><blockquote class=3D"gmail_quote" style=3D"marg=
in:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
Morning list,<br>
<br>
I have,<br>
<br>
Erlang R15B01 (erts-5.9.1) [source] [async-threads:0] [hipe] [kernel-poll:f=
alse]<br>
<br>
Eshell V5.9.1 =A0(abort with ^G)<br>
1&gt; List =3D &quot;89234789234jhk2hk234892789fauky324978&quot;.<br>
&quot;89234789234jhk2hk234892789fauky324978&quot;<br>
2&gt; &lt;&lt;List, &lt;&lt;&quot;-&quot;&gt;&gt;/binary&gt;&gt;.<br>
** exception error: bad argument<br>
<br>
But when I write it as this,<br>
<br>
3&gt; &lt;&lt;&quot;89234789234jhk2hk234892789fauky324978&quot;, &lt;&lt;&q=
uot;-&quot;&gt;&gt;/binary&gt;&gt;.<br>
&lt;&lt;&quot;89234789234jhk2hk234892789fauky324978-&quot;&gt;&gt;<br>
<br>
I get the result I expected to get from the above 1 &amp; 2. Could someone<=
br>
please explain what is going wrong and why, because I&#39;m very confused<b=
r>
with it.<br>
<br>
Regards<br>
<br>
Chris Cook.<br>
_______________________________________________<br>
erlang-questions mailing list<br>
<a href=3D"mailto:erlang-questi...@erlang.org">erlang-questi...@erlang.org<=
/a><br>
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blank">http://erlang.org/mailman/listinfo/erlang-questions</a><br>
</blockquote></div>

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