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PR_ReadDir
==========
Gets a pointer to the next entry in the directory.
Syntax
------
.. code::
#include <prio.h>
PRDirEntry* PR_ReadDir(
PRDir *dir,
PRDirFlags flags);
Parameters
~~~~~~~~~~
The function has the following parameters:
``dir``
A pointer to a :ref:`PRDir` object that designates an open directory.
``flags``
Specifies which directory entries, if any, to skip. Values can
include the following:
- :ref:`PR_SKIP_NONE`. Do not skip any files.
- :ref:`PR_SKIP_DOT`. Skip the directory entry "." representing the
current directory.
- :ref:`PR_SKIP_DOT_DOT`. Skip the directory entry ".." representing
the parent directory.
- :ref:`PR_SKIP_BOTH`. Skip both "." and ".."
- :ref:`PR_SKIP_HIDDEN`. Skip hidden files. On Windows platforms and
the Mac OS, this value identifies files with the "hidden"
attribute set. On Unix platform, this value identifies files whose
names begin with a period (".").
Returns
~~~~~~~
- A pointer to the next entry in the directory.
- If the end of the directory is reached or an error occurs, ``NULL``.
The reason can be retrieved via :ref:`PR_GetError`.
Description
-----------
:ref:`PR_ReadDir` returns a pointer to a directory entry structure:
.. code::
struct PRDirEntry {
const char *name;
};
typedef struct PRDirEntry PRDirEntry;
The structure has the following field:
``name``
Name of entry, relative to directory name.
The ``flags`` parameter is an enum of type ``PRDirFlags``:
.. code::
typedef enum PRDirFlags {
PR_SKIP_NONE = 0x0,
PR_SKIP_DOT = 0x1,
PR_SKIP_DOT_DOT = 0x2,
PR_SKIP_BOTH = 0x3,
PR_SKIP_HIDDEN = 0x4
} PRDirFlags;
The memory associated with the returned PRDirEntry structure is managed
by NSPR. The caller must not free the ``PRDirEntry`` structure.
Moreover, the ``PRDirEntry`` structure returned by each :ref:`PR_ReadDir`
call is valid only until the next :ref:`PR_ReadDir` or :ref:`PR_CloseDir` call
on the same :ref:`PRDir` object.
If the end of the directory is reached, :ref:`PR_ReadDir` returns ``NULL``,
and :ref:`PR_GetError` returns ``PR_NO_MORE_FILES_ERROR``.
See Also
--------
:ref:`PR_OpenDir`
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