89 lines
2.4 KiB
HTML
89 lines
2.4 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="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 reads directory items.</p>
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<pre>
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FRESULT f_readdir (
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DIR* <em>DirObject</em>, // Pointer to the directory object strcture
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FILINFO* <em>FileInfo</em> // Pointer to the blank 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 valid directory object strcture.</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</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_RW_ERROR</dt>
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<dd>Any error occured in low level disk I/O.</dd>
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<dt>FR_NOT_ENABLED</dt>
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<dd>FatFs module has not been enabled.</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 reads directory items in sequence. All items in the directory can be read by calling f_readdir repeatedly. When all items have been read and no item to read, the member <tt>f_name[]</tt> in the file information structure gets a null string. For details of the file informations, refer to the <tt>FILINFO</tt>.</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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void scan_files (char* path)
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{
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FILINFO finfo;
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DIR dirs;
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int i;
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if (f_opendir(&dirs, path) == FR_OK) {
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i = strlen(path);
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while ((f_readdir(&dirs, &finfo) == FR_OK) && finfo.f_name[0]) {
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if (finfo.f_attrib & AM_DIR) {
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sprintf(path+i, "/%s", &finfo.f_name[0]);
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scan_files(path);
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*(path+i) = '\0';
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} else {
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printf("%s/%s\n", path, &finfo.f_name[0]);
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}
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}
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}
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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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