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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>