| 123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990919293949596979899100101102103104105106107108109110111112113114115116117118119120121122123124125126127128129 | 
							- <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
 
- <html lang="en">
 
- <head>
 
- <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
 
- <meta http-equiv="Content-Style-Type" content="text/css">
 
- <link rel="up" title="FatFs" href="../00index_e.html">
 
- <link rel="alternate" hreflang="ja" title="Japanese" href="../ja/readdir.html">
 
- <link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default">
 
- <title>FatFs - f_readdir</title>
 
- </head>
 
- <body>
 
- <div class="para func">
 
- <h2>f_readdir</h2>
 
- <p>The f_readdir function reads an item of the directory.</p>
 
- <pre>
 
- FRESULT f_readdir (
 
-   DIR* <span class="arg">dp</span>,      <span class="c">/* [IN] Directory object */</span>
 
-   FILINFO* <span class="arg">fno</span>  <span class="c">/* [OUT] File information structure */</span>
 
- );
 
- </pre>
 
- </div>
 
- <div class="para arg">
 
- <h4>Parameters</h4>
 
- <dl class="par">
 
- <dt>dp</dt>
 
- <dd>Pointer to the open directory object or null pointer.</dd>
 
- <dt>fno</dt>
 
- <dd>Pointer to the <a href="sfileinfo.html">file information structure</a> to store the information about read item.</dd>
 
- </dl>
 
- </div>
 
- <div class="para ret">
 
- <h4>Return Values</h4>
 
- <p>
 
- <a href="rc.html#ok">FR_OK</a>,
 
- <a href="rc.html#de">FR_DISK_ERR</a>,
 
- <a href="rc.html#ie">FR_INT_ERR</a>,
 
- <a href="rc.html#io">FR_INVALID_OBJECT</a>,
 
- <a href="rc.html#tm">FR_TIMEOUT</a>,
 
- <a href="rc.html#nc">FR_NOT_ENOUGH_CORE</a>
 
- </p>
 
- </div>
 
- <div class="para desc">
 
- <h4>Description</h4>
 
- <p>The <tt>f_readdir</tt> function reads a directory item, informations about the object. All items in the directory can be read in sequence by <tt>f_readdir</tt> function calls. Dot entries (<tt>"."</tt> and <tt>".."</tt>) in the sub-directory are filtered out and they will never appear in the read items. When all directory items have been read and no item to read, a nul string is stored into the <tt>fno->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>
 
- <p>When support of long file name (LFN) is enabled, a member <tt>altname[]</tt> is defined in the file information structure to store the short file name of the object. In case of the some conditions listed below, short file name is stored into the <tt>fname[]</tt> and <tt>altname[]</tt> has a null string.</p>
 
- <ul>
 
- <li>The item has no long file name. (Not the case at exFAT volume)</li>
 
- <li>Setting of <tt>_MAX_LFN</tt> is insufficient for the long file name. (Not the case at <tt>_MAX_LFN == 255</tt>)</li>
 
- <li>The long file name contains any character not allowed in ANSI/OEM code. (Not the case at <tt>_LFN_UNICODE == 1</tt>)</li>
 
- </ul>
 
- <p>There is a problem on reading a directory of exFAT volume. The exFAT does not support short file name. This means no name can be returned on the condition above. If it is the case, a "?" is returned as file name to indicate that the object is not accessible. To avoid this problem, configure FatFs <tt>_LFN_UNICODE = 1</tt> and <tt>_MAX_LFN = 255</tt> to support the full feature of LFN specification.</p>
 
- </div>
 
- <div class="para comp">
 
- <h4>QuickInfo</h4>
 
- <p>Available when <tt>_FS_MINIMIZE <= 1</tt>.</p>
 
- </div>
 
- <div class="para use">
 
- <h4>Sample Code</h4>
 
- <pre>
 
- FRESULT scan_files (
 
-     char* path        <span class="c">/* Start node to be scanned (***also used as work area***) */</span>
 
- )
 
- {
 
-     FRESULT res;
 
-     DIR dir;
 
-     UINT i;
 
-     static FILINFO fno;
 
-     res = f_opendir(&dir, path);                       <span class="c">/* Open the directory */</span>
 
-     if (res == FR_OK) {
 
-         for (;;) {
 
-             res = f_readdir(&dir, &fno);                   <span class="c">/* Read a directory item */</span>
 
-             if (res != FR_OK || fno.fname[0] == 0) break;  <span class="c">/* Break on error or end of dir */</span>
 
-             if (fno.fattrib & AM_DIR) {                    <span class="c">/* It is a directory */</span>
 
-                 i = strlen(path);
 
-                 sprintf(&path[i], "/%s", fno.fname);
 
-                 res = scan_files(path);                    <span class="c">/* Enter the directory */</span>
 
-                 if (res != FR_OK) break;
 
-                 path[i] = 0;
 
-             } else {                                       <span class="c">/* It is a file. */</span>
 
-                 printf("%s/%s\n", path, fno.fname);
 
-             }
 
-         }
 
-         f_closedir(&dir)
 
-     }
 
-     return res;
 
- }
 
- int main (void)
 
- {
 
-     FATFS fs;
 
-     FRESULT res;
 
-     char buff[256];
 
-     res = f_mount(&fs, "", 1);
 
-     if (res == FR_OK) {
 
-         strcpy(buff, "/");
 
-         res = scan_files(buff);
 
-     }
 
-     return res;
 
- }
 
- </pre>
 
- </div>
 
- <div class="para ref">
 
- <h4>See Also</h4>
 
- <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>
 
- </div>
 
- <p class="foot"><a href="../00index_e.html">Return</a></p>
 
- </body>
 
- </html>
 
 
  |