## f_readdir

The f_readdir function reads directory entries.

    FRESULT f_readdir (
      DIR* dp,      /* [IN] Directory object */
      FILINFO* fno  /* [OUT] File information structure */
    );

#### Parameters

dp
  Pointer to the directory object opened by `f_opendir` function.
fno
  Pointer to the file information structure to store the information about read item.

#### Return Values

FR_OK, FR_DISK_ERR, FR_INT_ERR, FR_INVALID_OBJECT, FR_TIMEOUT, FR_NOT_ENOUGH_CORE

#### Description

The `f_readdir` function reads directory items, informations about file and directory, in sequence. All items in the directory can be read by calling `f_readdir` function repeatedly. When relative path feature is enabled (`_FS_RPATH >= 1`), 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 stored into the `fno->fname[]` without any error. When a null pointer is given to the `fno`, the read index of the directory object is rewinded.

When LFN feature is enabled, `lfname` and `lfsize` in the file information structure must be initialized with valid value prior to use it. The `lfname` is a pointer to the LFN read buffer. The `lfsize` is size of the LFN read buffer in unit of `TCHAR`. If the LFN is not needed, set a null pointer to the `lfname` and the LFN is not returned. A null string will be returned into the LFN read buffer in case of following conditions.

- The directory item has no LFN information.
- Either the size of read buffer or LFN working buffer is insufficient for the LFN.
- The LFN contains any Unicode character that cannot be converted to OEM code. (not the case at Unicode API cfg.)

When the directory item has no LFN, lower case characters can be contained in the `fname[]`.

#### QuickInfo

Available when `_FS_MINIMIZE <= 1`.

#### Sample Code

    FRESULT scan_files (
        char* path        /* Start node to be scanned (also used as work area) */
    )
    {
        FRESULT res;
        FILINFO fno;
        DIR dir;
        int i;
        char *fn;   /* This function assumes non-Unicode configuration */
    #if _USE_LFN
        static char lfn[_MAX_LFN + 1];   /* Buffer to store the LFN */
        fno.lfname = lfn;
        fno.lfsize = sizeof lfn;
    #endif

        res = f_opendir(&dir, path);                       /* Open the directory */
        if (res == FR_OK) {
            i = strlen(path);
            for (;;) {
                res = f_readdir(&dir, &fno);                   /* Read a directory item */
                if (res != FR_OK || fno.fname[0] == 0) break;  /* Break on error or end of dir */
                if (fno.fname[0] == '.') continue;             /* Ignore dot entry */
    #if _USE_LFN
                fn = *fno.lfname ? fno.lfname : fno.fname;
    #else
                fn = fno.fname;
    #endif
                if (fno.fattrib & AM_DIR) {                    /* It is a directory */
                    sprintf(&path[i], "/%s", fn);
                    res = scan_files(path);
                    path[i] = 0;
                    if (res != FR_OK) break;
                } else {                                       /* It is a file. */
                    printf("%s/%s\n", path, fn);
                }
            }
            f_closedir(&dir)
        }

        return res;
    }

#### See Also

`f_opendir, f_closedir, f_stat, FILINFO, DIR`

Return