241 lines
6.9 KiB
HTML
241 lines
6.9 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
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<html>
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta name="Copyright" content="Copyright (c) 2006 by IBM Corporation">
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<title>QlgReaddir()--Read Directory Entry (using NLS-enabled path name)</title>
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<!-- Begin Header Records -->
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<!-- All rights reserved. Licensed Materials Property of IBM -->
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<!-- US Government Users Restricted Rights -->
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<!-- Use, duplication or disclosure restricted by -->
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<!-- GSA ADP Schedule Contract with IBM Corp. -->
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<!-- file cleaned -->
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<!-- Created by Yvonne Griffin for V5R1-->
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<!-- Change History: -->
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<!-- 011022 JTROUS Changes from API Review 1, V5R2 -->
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<!-- This file has undergone html cleanup June 2002 by JET -->
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<!-- End Header Records -->
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<link rel="stylesheet" type="text/css" href="../rzahg/ic.css">
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</head>
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<body>
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<a name="Top_Of_Page"></a>
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<!--Java sync-link-->
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<script language="Javascript" src="../rzahg/synch.js" type="text/javascript">
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</script>
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<h2>QlgReaddir()--Read Directory Entry (using NLS-enabled path name)</h2>
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<div class="box" style="width: 60%;">
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<br>
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Syntax<br>
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<pre>
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#include <sys/types.h>
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#include <dirent.h>
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struct dirent_lg *QlgReaddir(DIR <em>*dirp</em>);
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</pre>
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Service Program Name: QP0LLIB1<br>
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<!-- iddvc RMBR -->
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<br>
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Default Public Authority: *USE<br>
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<!-- iddvc RMBR -->
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<br>
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Threadsafe: No; see Usage Notes for <a href=
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"readdir.htm">readdir()</a>.<br>
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<!-- iddvc RMBR -->
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<br>
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</div>
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<p>The <strong>QlgReaddir()</strong> function, like the <strong>
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readdir()</strong> function, returns a pointer to a structure describing the
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next directory entry in the directory stream associated with <em>dirp</em>. The
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difference is that the <strong>QlgReaddir()</strong> function takes a pointer
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to a <samp>dirent_lg</samp> structure, while <strong>readdir()</strong> takes a
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pointer to a <samp>dirent</samp> structure.</p>
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<p>Limited information on the <em>dirp</em> parameter is provided here. For
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more information on the <em>dirp</em> parameter and for a discussion of
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authorities required, return values, and related information, see <a href=
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"readdir.htm">readdir()</a>--Read Directory Entry.</p>
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<br>
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<h3>Parameters</h3>
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<dl>
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<dt><strong><em>dirp</em></strong></dt>
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<dd>(Input) A pointer to DIR that refers to the open directory stream to be
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read. This pointer is returned by <strong>QlgOpendir()</strong>.
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<p>A <samp>dirent_lg</samp> structure has the following contents:</p>
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<table border>
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<tr>
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<td align="left" valign="top" width="20%">char</td>
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<td align="left" valign="top" width="20%">d_reserved1[16]</td>
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<td align="left" valign="top" width="60%">Reserved.</td>
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</tr>
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<tr>
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<td align="left" valign="top">unsigned int</td>
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<td align="left" valign="top">d_fileno_gen_id</td>
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<td align="left" valign="top">The generation ID associated with the file
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ID.</td>
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</tr>
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<tr>
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<td align="left" valign="top">ino_t</td>
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<td align="left" valign="top">d_fileno</td>
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<td align="left" valign="top">The file ID of the file. This number uniquely
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identifies the object within a file system.</td>
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</tr>
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<tr>
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<td align="left" valign="top">unsigned int</td>
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<td align="left" valign="top">d_reclen</td>
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<td align="left" valign="top">The length of the directory entry in bytes.</td>
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</tr>
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<tr>
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<td align="left" valign="top">int</td>
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<td align="left" valign="top">d_reserved3</td>
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<td align="left" valign="top">Reserved.</td>
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</tr>
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<tr>
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<td align="left" valign="top">char</td>
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<td align="left" valign="top">d_reserved4[6]</td>
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<td align="left" valign="top">Reserved.</td>
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</tr>
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<tr>
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<td align="left" valign="top">char</td>
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<td align="left" valign="top">d_reserved5[2]</td>
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<td align="left" valign="top">Reserved.</td>
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</tr>
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<tr>
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<td align="left" valign="top">Qlg_Path_Name_T</td>
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<td align="left" valign="top">d_lg_name</td>
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<td align="left" valign="top">A Qlg_Path_Name_T that gives the name of a file
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in the directory. The path name is not null-terminated within the structure.
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The structure also provides National Language Support information, which
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includes ccsid, country_id, and language_id. This structure has a maximum
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length of {_QP0L_DIR_NAME_LG} bytes. For more information on the
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Qlg_Path_Name_T structure, see <a href="../apiref/pns.htm">Path name format</a>.</td>
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</tr>
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</table>
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</dd>
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</dl>
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<br>
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<h3>Related Information</h3>
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<ul>
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<li><a href="readdir.htm">readdir()</a>--Read Directory Entry<br>
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<br>
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</li>
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<li><a href="opendiru.htm">QlgOpendir()</a>--Open Directory (using NLS-enabled
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path name)<br>
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<br>
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</li>
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<li><a href="pathconfu.htm">QlgPathconf()</a>--Get Configurable Path Name
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Variables (using NLS-enabled path name)</li>
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</ul>
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<br>
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<h3>Example</h3>
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<p>See <a href="../apiref/aboutapis.htm#codedisclaimer">Code disclaimer information</a>
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for information pertaining to code examples.</p>
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<p>The following example reads the contents of a root directory:</p>
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<pre>
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#include <sys/types.h>
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#include <dirent.h>
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#include <errno.h>
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#include <stdio.h>
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main() {
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typedef struct my_dirent_lg
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{
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struct dirent_lg *entry;
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char d_lg_name[1];
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};
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struct my_dirent_lg lg_struct;
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struct dirent_lg *entry;
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#define mypath "/"
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const char US_const[3]= "US";
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const char Language_const[4]="ENU";
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typedef struct pnstruct
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{
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Qlg_Path_Name_T qlg_struct;
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char pn[100]; /* This array size must be >= */
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/* the length of the path name */
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/* or this must be a pointer */
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/* to the path name. */
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};
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struct pnstruct path;
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DIR *dir;
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/***************************************************************/
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/* Initialize Qlg_Path_Name_T parameters */
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/***************************************************************/
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memset((void*)&path, 0x00, sizeof(struct pnstruct));
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path.qlg_struct.CCSID = 37;
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memcpy(path.qlg_struct.Country_ID,US_const,2);
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memcpy(path.qlg_struct.Language_ID,Language_const,3);
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path.qlg_struct.Path_Type = QLG_CHAR_SINGLE;
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path.qlg_struct.Path_Length = sizeof(mypath)-1;
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path.qlg_struct.Path_Name_Delimiter[0] = '/';
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memcpy(path.pn,mypath,sizeof(mypath)-1);
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if ((dir = QlgOpendir((Qlg_Path_Name_T *)&path)) == NULL)
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perror("QlgOpendir() error");
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else {
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puts("contents of root:");
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while ((entry = QlgReaddir(dir)) != NULL)
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printf(" %s\n", entry->d_lg_name);
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closedir(dir);
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}
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}
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</pre>
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<p><strong>Output:</strong></p>
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<pre>
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contents of root:
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.
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..
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QSYS.LIB
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QDLS
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QOpenSys
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QOPT
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home
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</pre>
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<hr>
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API introduced: V5R1
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<hr>
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<center>
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<table cellpadding="2" cellspacing="2">
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<tr align="center">
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<td valign="middle" align="center"><a href="#Top_Of_Page">Top</a> | <a href=
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"unix.htm">UNIX-Type APIs</a> | <a href="aplist.htm">APIs by category</a></td>
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</tr>
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</table>
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</center>
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</body>
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</html>
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