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---
title: nsIDirectoryServiceProvider
slug: Mozilla/Tech/XPCOM/Reference/Interface/nsIDirectoryServiceProvider
translation_of: Mozilla/Tech/XPCOM/Reference/Interface/nsIDirectoryServiceProvider
---
<p></p><div style="border: solid #ddd 2px; margin-bottom: 12px;">
<div style="background: #eee; padding: 2px;"><code><a href="https://dxr.mozilla.org/mozilla-central/source/xpcom/io/nsIDirectoryService.idl" rel="custom">xpcom/io/nsIDirectoryService.idl</a></code><span style="text-align: right; float: right;"><a href="/zh-CN/docs/Interfaces/About_Scriptable_Interfaces" style="color: #00cc00; font-weight: 700;">脚本化</a></span></div>
<span style="padding: 4px 2px;">
本接口是目录服务用于得到文件位置的函数。
</span>
<div style="background: #eee; padding: 2px;">
继承于: <code><a href="/zh-CN/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsISupports" title="">nsISupports</a></code>
<span style="text-align: right; float: right;">最后修改于Gecko 1.7 </span></div>
</div><p></p>
<p><code>nsIDirectoryServiceProvider</code>.</p>
<h2 id="Method_overview" name="Method_overview">方法概览</h2>
<table class="standard-table">
<tbody>
<tr>
<td><code>nsIFile <a href="#getFile()">getFile</a>(in string prop, out PRBool persistent);</code></td>
</tr>
</tbody>
</table>
<h2 id="Methods" name="Methods">方法</h2>
<h3 id="getFile()" name="getFile()">getFile()</h3>
<p>The Directory Service calls this method when it gets the first request for a prop or on every request if the prop is not persistent.</p>
<pre class="eval">nsIFile getFile(
in string prop,
out PRBool persistent
);
</pre>
<h6 id="Parameters" name="Parameters">Parameters</h6>
<dl>
<dt>
<code>prop</code></dt>
<dd>
The symbolic name of the file.</dd>
<dt>
<code>persistent</code></dt>
<dd>
<code>true</code> if the returned file will be cached by Directory Service. Subsequent requests for this prop will bypass the provider and use the cache. <code>false</code> if the provider will be asked for this prop each time it is requested.</dd>
</dl>
<h6 id="Return_value" name="Return_value">Return value</h6>
<p>The <code><a href="/zh-CN/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIFile" title="">nsIFile</a></code> represented by the property.</p>
<h2 id="Example" name="Example">示例</h2>
<p>This code creates a global, read-only string called <code>currDir</code> with the value of the current working directory.</p>
<pre class="eval"> __defineGetter__("currDir",
function getCurrDir() {
return Components.classes["@mozilla.org/file/directory_service;1"]
.getService(Components.interfaces.nsIDirectoryServiceProvider)
.getFile("CurWorkD",{}).path;
});
</pre>
<p>Test it with to see the magic happen.</p>
<pre class="eval"> alert(currDir);
</pre>
<h2 id="See_also" name="See_also">参见</h2>
<ul>
<li><a href="/en/nsDirectoryService" title="en/nsDirectoryService">nsDirectoryService</a></li>
<li><code><a href="/zh-CN/docs/Mozilla/Tech/XPCOM/Reference/Interface/nsIDirectoryService" title="">nsIDirectoryService</a></code></li>
<li>（译注）其它目录服务关键字见<a href="http://mxr.mozilla.org/mozilla-central/source/xpcom/io/nsDirectoryServiceDefs.h" title="http://mxr.mozilla.org/mozilla-central/source/xpcom/io/nsDirectoryServiceDefs.h">nsDirectoryServiceDefs.h</a></li>
</ul>
<p>Additionally, see <a class="external" href="http://mb.eschew.org/16.php#sub_16.5.2">section 16.5.2</a> of the <a class="external" href="http://mb.eschew.org/">Rapid Application Development with Mozilla</a> book for instructions on how to get the <strong>current working directory</strong> and the <strong>process binary directory</strong>, among other things.</p>
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