📄 ch32_10.htm

📁 编程珍珠,里面很多好用的代码,大家可以参考学习呵呵,
💻 HTM
字号:
<html><head><title>Data::Dumper (Programming Perl)</title><!-- STYLESHEET --><link rel="stylesheet" type="text/css" href="../style/style1.css"><!-- METADATA --><!--Dublin Core Metadata--><meta name="DC.Creator" content=""><meta name="DC.Date" content=""><meta name="DC.Format" content="text/xml" scheme="MIME"><meta name="DC.Generator" content="XSLT stylesheet, xt by James Clark"><meta name="DC.Identifier" content=""><meta name="DC.Language" content="en-US"><meta name="DC.Publisher" content="O'Reilly &amp; Associates, Inc."><meta name="DC.Source" content="" scheme="ISBN"><meta name="DC.Subject.Keyword" content=""><meta name="DC.Title" content="Data::Dumper"><meta name="DC.Type" content="Text.Monograph"></head><body><!-- START OF BODY --><!-- TOP BANNER --><img src="gifs/smbanner.gif" usemap="#banner-map" border="0" alt="Book Home"><map name="banner-map"><AREA SHAPE="RECT" COORDS="0,0,466,71" HREF="index.htm" ALT="Programming Perl"><AREA SHAPE="RECT" COORDS="467,0,514,18" HREF="jobjects/fsearch.htm" ALT="Search this book"></map><!-- TOP NAV BAR --><div class="navbar"><table width="515" border="0"><tr><td align="left" valign="top" width="172"><a href="ch32_09.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0"></a></td><td align="center" valign="top" width="171"><a href="ch32_01.htm">Chapter 32: Standard Modules</a></td><td align="right" valign="top" width="172"><a href="ch32_11.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0"></a></td></tr></table></div><hr width="515" align="left"><!-- SECTION BODY --><h2 class="sect1">32.10. Data::Dumper</h2><a name="INDEX-5815"></a><blockquote><pre class="programlisting">use Data::Dumper;print Dumper($store);</pre></blockquote><p>When used on the example from <tt class="literal">Class::Struct</tt>, this prints:<blockquote><pre class="programlisting">$VAR1 = bless( {             'Shoppe::owner' =&gt; 'Abdul Alhazred',             'Shoppe::stock' =&gt; {                                  'charms' =&gt; 3,                                  'books' =&gt; 208,                                  'potions' =&gt; 'none'                                },             'Shoppe::boss' =&gt; bless( {                                        'Manager::name' =&gt;                                            'Prof L. P. Haitch',                                        'Manager::salary' =&gt;                                            'madness',                                        'Manager::started' =&gt;                                            'Sat Apr  1 16:18:13 2000'                                      }, 'Manager' ),             'Shoppe::addrs' =&gt; [                                  'Miskatonic University',                                  'Innsmouth, Mass.'                                ]           }, 'Shoppe' );</pre></blockquote><a name="INDEX-5816"></a><a name="INDEX-5817"></a><a name="INDEX-5818"></a><a name="INDEX-5819"></a><a name="INDEX-5820"></a>The <tt class="literal">Data::Dumper</tt> module's <tt class="literal">Dumper</tt>function takes a list of scalars (including references, which can evenrefer to objects) and returns a printable or<tt class="literal">eval</tt>able string that accurately reproduces anfaithful copy of the original.  You could use this to write out asaved version of a data structure to a regular disk file or into a DBMfile, or to pass it to another process over a pipe or socketconnection.  This module can be used with <tt class="literal">MLDBM</tt>from CPAN and <tt class="literal">DB_File</tt> to implement a DBM file thatcan transparently store complex data values, not just flat strings.Other stringification (or <em class="emphasis">serialization</em>, or<em class="emphasis">marshalling</em>) modules include<tt class="literal">Storable</tt> and <tt class="literal">FreezeThaw</tt>, bothavailable from CPAN.</p><!-- BOTTOM NAV BAR --><hr width="515" align="left"><div class="navbar"><table width="515" border="0"><tr><td align="left" valign="top" width="172"><a href="ch32_09.htm"><img src="../gifs/txtpreva.gif" alt="Previous" border="0"></a></td><td align="center" valign="top" width="171"><a href="index.htm"><img src="../gifs/txthome.gif" alt="Home" border="0"></a></td><td align="right" valign="top" width="172"><a href="ch32_11.htm"><img src="../gifs/txtnexta.gif" alt="Next" border="0"></a></td></tr><tr><td align="left" valign="top" width="172">32.9. Cwd</td><td align="center" valign="top" width="171"><a href="index/index.htm"><img src="../gifs/index.gif" alt="Book Index" border="0"></a></td><td align="right" valign="top" width="172">32.11. DB_File</td></tr></table></div><hr width="515" align="left"><!-- LIBRARY NAV BAR --><img src="../gifs/smnavbar.gif" usemap="#library-map" border="0" alt="Library Navigation Links"><p><font size="-1"><a href="copyrght.htm">Copyright &copy; 2001</a> O'Reilly &amp; Associates. All rights reserved.</font></p><map name="library-map"> <area shape="rect" coords="2,-1,79,99" href="../index.htm"><area shape="rect" coords="84,1,157,108" href="../perlnut/index.htm"><area shape="rect" coords="162,2,248,125" href="../prog/index.htm"><area shape="rect" coords="253,2,326,130" href="../advprog/index.htm"><area shape="rect" coords="332,1,407,112" href="../cookbook/index.htm"><area shape="rect" coords="414,2,523,103" href="../sysadmin/index.htm"></map><!-- END OF BODY --></body></html>
⌨️ 快捷键说明

复制代码 Ctrl + C
搜索代码 Ctrl + F
全屏模式 F11
切换主题 Ctrl + Shift + D
显示快捷键 ?
增大字号 Ctrl + =
减小字号 Ctrl + -