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tolua.html
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tolua.html
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<!DOCTYPE html>
<html dir="ltr" class="js desktop" lang="en">
<head>
<meta http-equiv="content-type" content="text/html; charset=UTF-8">
<meta charset="utf-8">
<title>tolua</title>
<script>
(function(H) {
H.className = H.className.replace(/\bno-js\b/, 'js')
})(document.documentElement)
</script>
<link rel="stylesheet" type="text/css" href="css.css">
<script type="text/javascript" charset="utf-8" src="js.js"></script>
</head>
<body>
<!--[if lte IE 7 ]><div id="IE7"><![endif]-->
<!--[if IE 8 ]><div id="IE8"><![endif]-->
<div id="dokuwiki__site">
<div id="dokuwiki__top" class="dokuwiki site mode_show ">
<!-- ********** HEADER ********** -->
<div id="dokuwiki__header">
<div class="pad group">
<hr class="a11y">
</div>
</div>
<!-- /header -->
<div class="wrapper group">
<!-- ********** CONTENT ********** -->
<div id="dokuwiki__content"><div class="pad group">
<div class="pageId"><span>zh_cn:api:tolua</span></div>
<div class="page group">
<!-- wikipage start -->
<!-- TOC START -->
<div id="dw__toc">
<h3 class="toggle">Table of Contents</h3>
<div>
<ul class="toc">
<li class="level1"><div class="li"><a href="#tolua">tolua</a></div>
<ul class="toc">
<li class="level2"><div class="li"><a href="#toluatype">tolua.type</a></div></li>
<li class="level2"><div class="li"><a href="#toluacast">tolua.cast</a></div></li>
<li class="level2"><div class="li"><a href="#toluaisnull">tolua.isnull</a></div></li>
</ul></li>
</ul>
</div>
</div>
<!-- TOC END -->
<h1 class="sectionedit1" id="tolua">tolua</h1>
<div class="level1">
<p>
提供几个 C++ 与 Lua 进行数据交换的工具函数。
</p>
<p>
~~
</p>
</div>
<h2 class="sectionedit2" id="toluatype">tolua.type</h2>
<div class="level2">
<p>
返回一个 C++ 对象的类型描述字符串。
</p>
<pre class="code lua"><span class="kw1">local</span> node <span class="sy0">=</span> display<span class="sy0">.</span>newNode<span class="br0">(</span><span class="br0">)</span>
<span class="kw3">print</span><span class="br0">(</span>tolua<span class="sy0">.</span><span class="kw3">type</span><span class="br0">(</span>node<span class="br0">)</span><span class="br0">)</span> <span class="co1">-- 输出 CCNode</span></pre>
<p>
~~
</p>
</div>
<h2 class="sectionedit3" id="toluacast">tolua.cast</h2>
<div class="level2">
<p>
强制转换对象类型，用途请参考
<a href="ccarray.html" class="wikilink1" title="zh_cn:api:ccarray">CCArray</a>。
</p>
<p>
格式：
</p>
<pre class="code lua">tolua<span class="sy0">.</span>cast<span class="br0">(</span>对象<span class="sy0">,</span> 类型名称<span class="br0">)</span></pre>
<p>
~~
</p>
</div>
<h2 class="sectionedit4" id="toluaisnull">tolua.isnull</h2>
<div class="level2">
<p>
检查指定 Lua 值中保存的 C++ 对象是否已经被删除。
</p>
<p>
我们在将 C++ 对象保存到 Lua 值后。只要还有 Lua 代码在使用这些值，那么即使 C++ 对象已经被删除了，但 Lua 值仍然会存在。如果此时调用 Lua 值的方法就会出错。
</p>
<p>
因此可以用 tolua.isnull() 检查 Lua 值中的 C++ 对象是否已经被删除。
</p>
<p>
关于 C++ 对象如何在 Lua 中存储的问题，请参考
<a target="_blank" href="http://wiki.quick-x.com/doku.php?id=zh_cn:faq" class="wikilink1" title="zh_cn:faq">FAQ</a> 。
</p>
</div>
<!-- wikipage stop -->
</div>
<div class="docInfo">zh_cn/api/tolua.txt · Last modified: 2013/08/19 17:11 by Yu Lei Liao</div>
</div></div>
<!-- /content -->
<hr class="a11y">
<!-- PAGE ACTIONS -->
<div id="dokuwiki__pagetools">
<h3 class="a11y">Page Tools</h3>
<div class="tools">
<ul>
<li>
<a href="index.html" class="action backlink" rel="nofollow" title="home">
<span>home</span>
</a>
</li>
<li>
<a href="#dokuwiki__top" class="action top" accesskey="t" rel="nofollow" title="Back to top [T]">
<span>Back to top</span>
</a>
</li>
</ul>
</div>
</div>
</div>
<!-- /wrapper -->
</div>
</div>
<!-- /site -->
<div class="no">
<img src="zh_cn_api%20%5Bquick-cocos2d-x%20docs%5D_files/indexer.gif" alt="" height="1" width="2">
</div>
<div id="screen__mode" class="no"></div>
<!--[if ( lte IE 7 | IE 8 ) ]></div><![endif]-->
</body>
</html>