io.html

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<?xml version="1.0" ?>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
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<title>Tk::IO - high level interface to Tk's 'fileevent' mechanism</title>
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<h1><a>Tk::IO - high level interface to Tk's 'fileevent' mechanism</a></h1>
<p><a name="__index__"></a></p>

<!-- INDEX BEGIN -->

<ul>

	<li><a href="#name">NAME</a></li>
	<li><a href="#synopsis">SYNOPSIS</a></li>
	<li><a href="#warning">WARNING</a></li>
	<li><a href="#description">DESCRIPTION</a></li>
	<li><a href="#bugs">BUGS</a></li>
</ul>
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<hr />
<p>
</p>
<h1><a name="name">NAME</a></h1>
<p>Tk::IO - high level interface to Tk's 'fileevent' mechanism</p>
<p>
</p>
<hr />
<h1><a name="synopsis">SYNOPSIS</a></h1>
<pre>
  <span class="keyword">my</span> <span class="variable">$fh</span> <span class="operator">=</span> <span class="variable">Tk::IO</span><span class="operator">-&gt;</span><span class="variable">new</span><span class="operator">(</span><span class="string">-linecommand</span> <span class="operator">=&gt;</span> <span class="variable">callback</span><span class="operator">,</span> <span class="string">-childcommand</span> <span class="operator">=&gt;</span> <span class="variable">callback</span><span class="operator">);</span>
  <span class="variable">$fh</span><span class="operator">-&gt;</span><span class="keyword">exec</span><span class="operator">(</span><span class="string">"command"</span><span class="operator">)</span>
  <span class="variable">$fh</span><span class="operator">-&gt;</span><span class="keyword">wait</span>
  <span class="variable">$fh</span><span class="operator">-&gt;</span><span class="keyword">kill</span>
</pre>
<p>
</p>
<hr />
<h1><a name="warning">WARNING</a></h1>
<p>INTERFACES TO THIS MODULE MAY CHANGE AS PERL'S IO EVOLVES
AND WITH PORT OF TK4.1</p>
<p>
</p>
<hr />
<h1><a name="description">DESCRIPTION</a></h1>
<p>Tk::IO is now layered on perl's IO::Handle class. Interfaces
have changed, and are still evolving.</p>
<p>In theory C methods which enable non-blocking IO as in earlier Tk-b*
<code>release(s)</code> are still there. I have not changed them to use perl's
additional Configure information, or tested them much.</p>
<p>Assumption is that <strong>exec</strong> is
used to fork a child process and a callback is called each time a
complete line arrives up the implied pipe.</p>
<p>&quot;line&quot; should probably be defined in terms of perl's input record
separator but is not yet.</p>
<p>The -childcommand callback is called when end-of-file occurs.</p>
<p>$fh-&gt;<strong>wait</strong> can be used to wait for child process while processing
other Tk events.</p>
<p>$fh-&gt;<strong>kill</strong> can be used to send signal to child process.</p>
<p>
</p>
<hr />
<h1><a name="bugs">BUGS</a></h1>
<p>Still not finished.
Idea is to use &quot;exec&quot; to emulate &quot;system&quot; in a non-blocking manner.</p>

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