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<html><head><title>Tie::Handle (Perl in a Nutshell, 2nd Edition)</title><link rel="stylesheet" type="text/css" href="../style/style1.css" /><meta name="DC.Creator" content="Stephen Spainhour" /><meta name="DC.Format" content="text/xml" scheme="MIME" /><meta name="DC.Language" content="en-US" /><meta name="DC.Publisher" content="O'Reilly & Associates, Inc." /><meta name="DC.Source" scheme="ISBN" content="0596002416L" /><meta name="DC.Subject.Keyword" content="stuff" /><meta name="DC.Title" content="Perl in a Nutshell, 2nd Edition" /><meta name="DC.Type" content="Text.Monograph" /></head><body bgcolor="#ffffff"><img src="gifs/smbanner.gif" usemap="#banner-map" border="0" alt="Book Home" /><map name="banner-map"><area shape="rect" coords="1,-2,616,66" href="index.htm" alt="Java and XSLT" /><area shape="rect" coords="629,-11,726,25" href="jobjects/fsearch.htm" alt="Search this book" /></map><div class="navbar"><table width="684" border="0"><tr><td align="left" valign="top" width="228"><a href="ch08_216.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0" /></a></td><td align="center" valign="top" width="228" /><td align="right" valign="top" width="228"><a href="ch08_218.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr></table></div><h2 class="sect1">8.217. Tie::Handle</h2><p><a name="INDEX-1586" />Provides skeletal methods forhandle-tying classes. Tie::Handle provides a <tt class="literal">new</tt>method as backup in case a class has no <tt class="literal">TIEHANDLE</tt>method. (See the <em class="emphasis">perltie</em> manpage for moredetailed information and for examples.) To write your own tied-handleclasses, use the following methods.</p><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>TIEHANDLE</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>TIEHANDLE <em class="replaceable">classname</em>, <em class="replaceable">list</em></pre><p>Constructor. This method is invoked by the command<tt class="literal">tie</tt> <em class="replaceable"><tt> *</em><em class="replaceable">glob</tt></em>,<em class="replaceable"><tt>classname</tt></em>. Associates new glob instancewith class <em class="replaceable"><tt>classname</tt></em>.<em class="replaceable"><tt>list</tt></em> represents any additional argumentsneeded to complete the association.</p></div><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>DESTROY</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>DESTROY <em class="replaceable">this</em></pre><p>Frees storage associated with the tied handle<em class="replaceable"><tt>this</tt></em>. Permits class to take some actionwhen an instance is destroyed. Rarely needed.</p></div><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>GETC</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>GETC <em class="replaceable">this</em></pre><p>Gets one character from tied handle <em class="replaceable">this</em>.</p></div><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>PRINT</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>PRINT <em class="replaceable">this</em>, <em class="replaceable">list</em></pre><p>Prints the values in <em class="replaceable">list</em>.</p></div><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>PRINTF</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>PRINTF <em class="replaceable">this</em>, <em class="replaceable">format</em>, <em class="replaceable">list</em></pre><p>Prints the values in <em class="replaceable">list</em> using<em class="replaceable"><tt>format</tt></em>.</p></div><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>READ</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>READ <em class="replaceable">this</em>, <em class="replaceable">scalar</em>, <em class="replaceable">length</em>, <em class="replaceable">offset</em></pre><p>Reads <em class="replaceable">length</em> bytes from<em class="replaceable"><tt>scalar</tt></em> starting at<em class="replaceable"><tt>offset</tt></em>.</p></div><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>READLINE</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>READLINE <em class="replaceable">this</em></pre><p>Reads one line from <em class="replaceable">this</em>.</p></div><div class="refentry"><table width="515" border="0" cellpadding="5"><tr><td align="left"><font size="+1"><b>WRITE</b></font></td><td align="right"><i></i></td></tr></table><hr width="515" size="3" noshade="true" align="left" color="black" /><pre>WRITE <em class="replaceable">this</em>, <em class="replaceable">scalar</em>, <em class="replaceable">length</em>, <em class="replaceable">offset</em></pre><p>Writes <em class="replaceable">length</em> bytes of data from<em class="replaceable"><tt>scalar</tt></em> starting at<em class="replaceable"><tt>offset</tt></em>.</p></div><hr width="684" align="left" /><div class="navbar"><table width="684" border="0"><tr><td align="left" valign="top" width="228"><a href="ch08_216.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0" /></a></td><td align="center" valign="top" width="228"><a href="index.htm"><img src="../gifs/txthome.gif" alt="Home" border="0" /></a></td><td align="right" valign="top" width="228"><a href="ch08_218.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0" /></a></td></tr><tr><td align="left" valign="top" width="228">8.216. Tie::File</td><td align="center" valign="top" width="228"><a href="index/index.htm"><img src="../gifs/index.gif" alt="Book Index" border="0" /></a></td><td align="right" valign="top" width="228">8.218. Tie::Hash</td></tr></table></div><hr width="684" align="left" /><img src="../gifs/navbar.gif" usemap="#library-map" border="0" alt="Library Navigation Links" /><p><p><font size="-1"><a href="copyrght.htm">Copyright © 2002</a> O'Reilly & Associates. 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