113 lines
3.8 KiB
HTML
113 lines
3.8 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="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">
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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>, /* Pointer to the open directory object */
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FILINFO* <em>FileInfo</em> /* Pointer to the file information structure */
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);
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</pre>
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</div>
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<div class="para">
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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">
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<h4>Return Values</h4>
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<dl class="ret">
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<dt>FR_OK (0)</dt>
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<dd>The function succeeded.</dd>
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<dt>FR_NOT_READY</dt>
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<dd>The disk drive cannot work due to no medium in the drive or any other reason.</dd>
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<dt>FR_DISK_ERR</dt>
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<dd>The function failed due to an error in the disk function.</dd>
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<dt>FR_INT_ERR</dt>
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<dd>The function failed due to a wrong FAT structure or an internal error.</dd>
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<dt>FR_INVALID_OBJECT</dt>
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<dd>The directory object is invalid.</dd>
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</dl>
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</div>
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<div class="para">
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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 items 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 calling 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. When either the size of specified buffer or LFN working buffer is insufficient to store the LFN or LFN is not exist, a null string will be returned. When <tt>lfname</tt> is a NULL, nothing is returned.</p>
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<p>For details on the file informations, refer to the <tt>FILINFO</tt>. This function is not supported in minimization level of >=2.</p>
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</div>
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<div class="para">
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<h4>Sample Code</h4>
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<pre>
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FRESULT scan_files (char* path)
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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;
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#if _USE_LFN
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static char lfn[_MAX_LFN * (_DF1S ? 2 : 1) + 1];
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fno.lfname = lfn;
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fno.lfsize = sizeof(lfn);
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#endif
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res = f_opendir(&dir, path);
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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);
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if (res != FR_OK || fno.fname[0] == 0) break;
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#if _USE_LFN
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fn = *fno.lfname ? fno.lfname : fno.fname;
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#else
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fn = fno.fname;
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#endif
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if (fno.fattrib & AM_DIR) {
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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 {
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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">
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<h4>References</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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