185 lines
12 KiB
HTML
185 lines
12 KiB
HTML
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<html lang="zh" dir="ltr" class="client-nojs" xmlns="http://www.w3.org/1999/xhtml" xml:lang="zh">
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<title>std::filesystem::directory_entry::refresh</title>
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<body class="mediawiki ltr sitedir-ltr ns-0 ns-subject page-cpp_filesystem_directory_entry_refresh skin-cppreference2 action-view cpp-navbar">
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<div id="cpp-content-base">
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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::filesystem::directory_entry::</span>refresh</h1>
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<div id="contentSub"><span class="subpages">< <a href="cpp.html">cpp</a>‎ | <a href="cpp-filesystem.html">filesystem</a>‎ | <a href="cpp-filesystem-directory_entry.html">directory entry</a></span></div>
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<div><span class="mw-geshi cpp source-cpp"><span class="kw4">void</span> refresh<span class="br0">(</span><span class="br0">)</span> <span class="kw4">const</span><span class="sy4">;</span><br />
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<span class="kw4">void</span> refresh<span class="br0">(</span> <a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a><span class="sy3">&</span> ec <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div>
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<td class="t-dcl-nopad"></td>
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<td><span class="t-mark-rev t-since-cxx17">(C++17 起)</span></td>
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<td></td>
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<td></td>
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<td></td>
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<p>检验此 directory_entry 所指代的文件系统对象，并为令 <a href="cpp-filesystem-directory_entry-status.html"><tt>status()</tt></a> 、 <a href="cpp-filesystem-directory_entry-exists.html"><tt>exists()</tt></a> 、 <a href="cpp-filesystem-directory_entry-is_regular_file.html"><tt>is_regular_file()</tt></a> 可获取其属性，而存储属性及其他状态访问器。</p>
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<p>若发生错误，则任何缓冲的属性的值是未指定的</p>
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<h3><span class="mw-headline" id=".E5.8F.82.E6.95.B0">参数</span></h3>
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<table class="t-par-begin">
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<td>ec</td>
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<td>-</td>
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<td>不抛出重载中报告错误的输出参数</td>
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<h3><span class="mw-headline" id=".E8.BF.94.E5.9B.9E.E5.80.BC">返回值</span></h3>
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<p>（无）</p>
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<h3><span class="mw-headline" id=".E5.BC.82.E5.B8.B8">异常</span></h3>
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<p>不接受 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a><span class="sy3">&</span></span></span> 参数的重载在底层 OS API 错误时抛出 <a href="cpp-filesystem-filesystem_error.html"><tt>filesystem_error</tt></a> ，以第一 path 参数 <code>p</code> 和作为错误码参数的 OS 错误码构造。若 OS API 调用失败，则接受 <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="cpp-error-error_code.html"><span class="kw877">std::<span class="me2">error_code</span></span></a><span class="sy3">&</span></span></span> 参数的重载设置该参数为 OS API 错误码，而若不出现错误则执行 <span class="t-c"><span class="mw-geshi cpp source-cpp">ec.<span class="me1">clear</span><span class="br0">(</span><span class="br0">)</span></span></span> 。若内存分配失败，则任何不标记为 <code>noexcept</code> 的重载可能抛出 <span class="t-lc"><a href="cpp-memory-new-bad_alloc.html">std::bad_alloc</a></span> 。</p>
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<h3><span class="mw-headline" id=".E6.B3.A8.E6.84.8F">注意</span></h3>
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<p>许多遍历目录的低层 OS API 将下个目录条目与文件属性一同获取。若它们存在，则 <code>directory_iterator</code> 的构造函数和非 const 函数将这些属性存储于所指向的 <a href="cpp-filesystem-directory_entry.html"><tt>directory_entry</tt></a> 中，而不调用 <strong class="selflink"><tt>directory_entry::refresh</tt></strong> 。这使得程序能够在迭代目录条目的同时检验其属性，而不进行额外的系统调用。</p>
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<h3><span class="mw-headline" id=".E7.A4.BA.E4.BE.8B">示例</span></h3>
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<table class="metadata plainlinks ambox mbox-small-left ambox-notice" style="">
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<td class="mbox-empty-cell"></td>
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<td class="mbox-text" style="">本节未完成<br />
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原因：暂无示例</td>
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<h3><span class="mw-headline" id=".E5.8F.82.E9.98.85">参阅</span></h3>
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-filesystem-directory_entry-status.html"><span class="t-lines"><span>status</span><span>symlink_status</span></span></a></div>
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</div>
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</td>
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<td>此 directory_entry 所指代的文件的状态<br />
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此 directory_entry 所指代的文件的符号链接状态<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-filesystem-directory_entry-exists.html"><span class="t-lines"><span>exists</span></span></a></div>
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</div>
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</td>
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<td>检查 directory_entry 是否代表既存文件系统对象<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-filesystem-directory_entry-is_block_file.html"><span class="t-lines"><span>is_block_file</span></span></a></div>
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</div>
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</td>
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<td>检查 directory_entry 是否代表阻塞设备<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<div class="t-dsc-member-div">
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<div><a href="cpp-filesystem-directory_entry-is_character_file.html"><span class="t-lines"><span>is_character_file</span></span></a></div>
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</div>
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</td>
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<td>检查 directory_entry 是否代表字符设备<br />
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<span class="t-mark">(公开成员函数)</span></td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-filesystem-directory_entry-is_directory.html"><span class="t-lines"><span>is_directory</span></span></a></div>
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</div>
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</td>
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<td>检查 directory_entry 是否代表目录<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<div class="t-dsc-member-div">
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<div><a href="cpp-filesystem-directory_entry-is_fifo.html"><span class="t-lines"><span>is_fifo</span></span></a></div>
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</div>
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</td>
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<td>检查 directory_entry 是否代表具名管道<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-filesystem-directory_entry-is_other.html"><span class="t-lines"><span>is_other</span></span></a></div>
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</div>
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</td>
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<td>检查 directory_entry 是否代表<i>其他</i>文件<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-filesystem-directory_entry-is_regular_file.html"><span class="t-lines"><span>is_regular_file</span></span></a></div>
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</div>
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</td>
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<td>检查 directory_entry 是否代表常规文件<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-filesystem-directory_entry-is_socket.html"><span class="t-lines"><span>is_socket</span></span></a></div>
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</div>
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</td>
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<td>检查 directory_entry 是否代表具名 IPC 接头<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-filesystem-directory_entry-is_symlink.html"><span class="t-lines"><span>is_symlink</span></span></a></div>
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</div>
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</td>
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<td>检查 directory_entry 是否代表符号链接<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-filesystem-directory_entry-file_size.html"><span class="t-lines"><span>file_size</span></span></a></div>
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</div>
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</td>
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<td>返回 directory_entry 所指代的文件大小<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-filesystem-directory_entry-hard_link_count.html"><span class="t-lines"><span>hard_link_count</span></span></a></div>
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</div>
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</td>
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<td>返回引用到该 directory_entry 所表示的文件的硬链接数<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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<tr class="t-dsc">
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<td>
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<div class="t-dsc-member-div">
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<div><a href="cpp-filesystem-directory_entry-last_write_time.html"><span class="t-lines"><span>last_write_time</span></span></a></div>
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</div>
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</td>
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<td>获取或设置 directory_entry 所代表的文件的最后数据修改时间<br />
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<span class="t-mark">(公开成员函数)</span></td>
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</tr>
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</table>
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</div>
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<div class="visualClear"></div>
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