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<link title="Netsmtp" rel="Chapter" href="Netsmtp.html"><title>Ocamlnet 2 Reference Manual : Netconversion.conversion_pipe</title>
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<center><h1>Class <a href="type_Netconversion.conversion_pipe.html">Netconversion.conversion_pipe</a></h1></center>
<br>
<pre><span class="keyword">class</span> <a name="TYPEconversion_pipe"></a>conversion_pipe : <code class="type">?subst:int -> string -> in_enc:<a href="Netconversion.html#TYPEencoding">encoding</a> -> out_enc:<a href="Netconversion.html#TYPEencoding">encoding</a> -> unit -> </code><code class="type"><a href="Netchannels.io_obj_channel.html">Netchannels.io_obj_channel</a></code></pre>This pipeline class (see <code class="code">Netchannels</code> for more information) can be used
to recode a netchannel while reading or writing. The argument <code class="code">in_enc</code>
is the input encoding, and <code class="code">out_enc</code> is the output encoding.
<p>
The channel must consist of a whole number of characters. If it
ends with an incomplete multi-byte character, however, this is
detected, and the exception <code class="code">Malformed_code</code> will be raised.
This exception is also raised for other encoding errors in the
channel data.
<p>
<b>Example.</b> Convert ISO-8859-1 to UTF-8 while writing to the file
<code class="code">"output.txt"</code>:
<p>
<pre><code class="code"> let ch = new output_channel (open_out "output.txt") in
let encoder =
new conversion_pipe ~in_enc:`Enc_iso88591 ~out_enc:`Enc_utf8 () in
let ch' = new output_filter encoder ch in
... (* write to ch' *)
ch' # close_out();
ch # close_out(); (* you must close both channels! *)
</code></pre>
<p>
If you write as UTF-16, don't forget to output the byte order
mark yourself, as the channel does not do this.
<p>
<b>Example.</b> Convert UTF-16 to UTF-8 while reading from the file
<code class="code">"input.txt"</code>:
<p>
<pre><code class="code"> let ch = new input_channel (open_in "input.txt") in
let encoder =
new conversion_pipe ~in_enc:`Enc_utf16 ~out_enc:`Enc_utf8 () in
let ch' = new input_filter ch encoder in
... (* read from ch' *)
ch' # close_in();
ch # close_in(); (* you must close both channels! *)
</code></pre>
<p>
<br>
<div class="param_info"><code class="code">subst</code> : This function is invoked for code points of <code class="code">in_enc</code> that
cannot be represented in <code class="code">out_enc</code>, and the result of the function
invocation is substituted (directly, without any further conversion).
Restriction: The string returned by <code class="code">subst</code> must not be longer than 50
bytes.
If <code class="code">subst</code> is missing, <code class="code">Cannot_represent</code> is raised in this case.</div>
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