savelij13
13034d028c
- f_mkfs() supports multiple partition to finish the multiple partition feature. - Added f_fdisk(). (_MULTI_PARTITION = 2)
120 lines
4.8 KiB
HTML
120 lines
4.8 KiB
HTML
<!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* <em>DirObject</em>, <span class="c">/* Pointer to the open directory object */</span>
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FILINFO* <em>FileInfo</em> <span class="c">/* Pointer to the 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>DirObject</dt>
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<dd>Pointer to the open directory object.</dd>
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<dt>FileInfo</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 f_readdir function reads directory entries in sequence. All items in the directory can be read by calling f_readdir function repeatedly. When all directory entries have been read and no item to read, the function returns a null string into <tt>f_name[]</tt> member without any error. When a null pointer is given to the <tt>FileInfo</tt>, the read index of the directory object will be 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 the f_readdir function. The <tt>lfname</tt> is a pointer to the string buffer to return the long file name. The <tt>lfsize</tt> is the size of the string buffer in unit of TCHAR. If either the size of read buffer or LFN working buffer is insufficient for the LFN or the object has no LFN, a null string will be returned to the LFN read buffer. If the LFN contains any charactrer that cannot be converted to OEM code, a null string will be returned but this is not the case on Unicode API configuration. When <tt>lfname</tt> is a NULL, nothing of the LFN is returned. When the object has no LFN, some small capitals can be contained in the SFN.</p>
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<p>When relative path feature is enabled <tt>(_FS_RPATH == 1)</tt>, "." and ".." entries are not filtered out and it will appear in the read entries.</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];
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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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}
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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="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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