126 lines
5.1 KiB
HTML
126 lines
5.1 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta http-equiv="Content-Style-Type" content="text/css">
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<link rel="up" title="FatFs" href="../00index_e.html">
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<link rel="alternate" hreflang="ja" title="Japanese" href="../ja/readdir.html">
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<link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default">
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<title>FatFs - f_readdir</title>
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</head>
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<body>
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<div class="para func">
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<h2>f_readdir</h2>
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<p>The f_readdir function reads directory entries.</p>
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<pre>
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FRESULT f_readdir (
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DIR* <span class="arg">dp</span>, <span class="c">/* [IN] Directory object */</span>
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FILINFO* <span class="arg">fno</span> <span class="c">/* [OUT] File information structure */</span>
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);
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</pre>
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</div>
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<div class="para arg">
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<h4>Parameters</h4>
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<dl class="par">
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<dt>dp</dt>
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<dd>Pointer to the open directory object.</dd>
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<dt>fno</dt>
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<dd>Pointer to the file information structure to store the read item.</dd>
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</dl>
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</div>
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<div class="para ret">
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<h4>Return Values</h4>
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<p>
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<a href="rc.html#ok">FR_OK</a>,
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<a href="rc.html#de">FR_DISK_ERR</a>,
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<a href="rc.html#ie">FR_INT_ERR</a>,
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<a href="rc.html#nr">FR_NOT_READY</a>,
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<a href="rc.html#io">FR_INVALID_OBJECT</a>,
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<a href="rc.html#tm">FR_TIMEOUT</a>,
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<a href="rc.html#nc">FR_NOT_ENOUGH_CORE</a>
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</p>
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</div>
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<div class="para desc">
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<h4>Description</h4>
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<p>The <tt>f_readdir()</tt> function reads directory items, file and directory, in sequence. All items in the directory can be read by calling <tt>f_readdir()</tt> function repeatedly. When relative path feature is enabled (<tt>_FS_RPATH >= 1</tt>), dot entries ("." and "..") are not filtered out and they will appear in the read items. When all directory items have been read and no item to read, a null string is returned into the <tt>fname[]</tt> without any error. When a null pointer is given to the <tt class="arg">fno</tt>, the read index of the directory object is rewinded.</p>
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<p>When LFN feature is enabled, <tt>lfname</tt> and <tt>lfsize</tt> in the file information structure must be initialized with valid value prior to use it. The <tt>lfname</tt> is a pointer to the LFN read buffer. The <tt>lfsize</tt> is size of the LFN read buffer in unit of <tt>TCHAR</tt>. If the LFN is not needed, set a null pointer to the <tt>lfname</tt> and the LFN is not returned. A null string will be returned into the LFN read buffer in case of following conditions.</p>
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<ul>
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<li>The directory item has no LFN information.</li>
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<li>Either the size of read buffer or LFN working buffer is insufficient for the LFN.</li>
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<li>The LFN contains Unicode charactrer that cannot be converted to OEM code. (not the case on Unicode API)</li>
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</ul>
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<p>When the directory item has no LFN information, lower case characters can be contained in the <tt>fname[]</tt>.</p>
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</div>
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<div class="para comp">
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<h4>QuickInfo</h4>
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<p>Available when <tt>_FS_MINIMIZE <= 1</tt>.</p>
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</div>
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<div class="para use">
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<h4>Sample Code</h4>
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<pre>
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FRESULT scan_files (
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char* path <span class="c">/* Start node to be scanned (also used as work area) */</span>
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)
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{
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FRESULT res;
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FILINFO fno;
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DIR dir;
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int i;
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char *fn; <span class="c">/* This function is assuming non-Unicode cfg. */</span>
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<span class="k">#if</span> _USE_LFN
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static char lfn[_MAX_LFN + 1]; <span class="c">/* Buffer to store the LFN */</span>
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fno.lfname = lfn;
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fno.lfsize = sizeof lfn;
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<span class="k">#endif</span>
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res = f_opendir(&dir, path); <span class="c">/* Open the directory */</span>
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if (res == FR_OK) {
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i = strlen(path);
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for (;;) {
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res = f_readdir(&dir, &fno); <span class="c">/* Read a directory item */</span>
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if (res != FR_OK || fno.fname[0] == 0) break; <span class="c">/* Break on error or end of dir */</span>
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if (fno.fname[0] == '.') continue; <span class="c">/* Ignore dot entry */</span>
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<span class="k">#if</span> _USE_LFN
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fn = *fno.lfname ? fno.lfname : fno.fname;
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<span class="k">#else</span>
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fn = fno.fname;
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<span class="k">#endif</span>
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if (fno.fattrib & AM_DIR) { <span class="c">/* It is a directory */</span>
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sprintf(&path[i], "/%s", fn);
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res = scan_files(path);
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if (res != FR_OK) break;
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path[i] = 0;
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} else { <span class="c">/* It is a file. */</span>
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printf("%s/%s\n", path, fn);
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}
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}
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f_closedir(&dir)
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}
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return res;
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}
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</pre>
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</div>
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<div class="para ref">
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<h4>See Also</h4>
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<p><tt><a href="opendir.html">f_opendir</a>, <a href="closedir.html">f_closedir</a>, <a href="stat.html">f_stat</a>, <a href="sfileinfo.html">FILINFO</a>, <a href="sdir.html">DIR</a></tt></p>
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</div>
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<p class="foot"><a href="../00index_e.html">Return</a></p>
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</body>
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</html>
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