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Date: Tue, 28 Oct 2014 21:18:43 +0100
From: Pierre Chambart <pierre.chambart@laposte.net>
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To: Gabriel Scherer <gabriel.scherer@gmail.com>, 
 David Allsopp <dra-news@metastack.com>
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Subject: Re: [Caml-list] <DKIM> Re: Vagaries of Printf variants

On 28/10/2014 10:19, Gabriel Scherer wrote:
> If you know from the start that you need this flexibility, the easiest
> way is probably to use Printf.bprintf from the start, which is
> reasonably efficient and flexible (or write your fprintf-formats with
> %s rather than %a).
>
> If you specifically need to convert code that uses (f)printf with
> minimal changes, you have the problem that your %a/%t functions work
> with out_channel, not strings. The simplest way out is probably to use
> Unix.pipe (which is available on Windows) to create an out_channel
> that you write into and read back the content as a string.
I wouldn't recommend something like that: you are exposing yourself to
deadlocks.
If you are not carefull, your write will reach the OS-defined limit to
the pipe size, and
will block the process until someone reads the pipe. So you will need
another
thread to read the channel...
-- 
Pierre