259 lines
7.9 KiB
HTML
259 lines
7.9 KiB
HTML
<!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>QlgOpendir()--Open Directory (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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<!-- Change History: -->
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<!-- YYMMDD USERID Change description -->
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<!-- Created by Yvonne Griffin for V5R1-->
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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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<!--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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<a name="Top_Of_Page"></a>
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<h2>QlgOpendir()--Open Directory (using NLS-enabled path name)</h2>
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<div class="box" style="width: 70%;">
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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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DIR *QlgOpendir(Qlg_Path_Name_T <em>*dirname</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: Conditional; see Usage Notes for <a href=
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"opendir.htm">opendir()</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>QlgOpendir()</strong> function, like the <strong>
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opendir()</strong> function, opens a directory so it can be read. The
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difference is that the <strong>QlgOpendir()</strong> function takes a pointer
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to a Qlg_Path_Name_T structure, while the <strong>opendir()</strong> function
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takes a pointer to a character string. The <strong>QlgOpendir()</strong>
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function opens a directory so it can be read with the <strong>
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QlgReaddir()</strong> function.</p>
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<p>Names returned on calls to <strong>QlgReaddir()</strong> are returned in the
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coded character set identifier (CCSID) specified at the time the directory is
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opened. <strong>QlgOpendir()</strong> allows the CCSID to be specified in the
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Qlg_Path_Name_T structure. <strong>opendir()</strong> uses the CCSID that is in
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effect for the current job at the time the <strong>opendir()</strong> function
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is called. See <a href="opendir.htm">opendir()</a>--Open Directory for more on
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the job CCSID.</p>
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<p>Limited information on the <em>dirname</em> parameter is provided here. For
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more information on the <em>dirname</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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"opendir.htm">opendir()</a>--Open Directory.</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>dirname</em></strong></dt>
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<dd>(Input) A pointer to a Qlg_Path_Name_T structure that contains a path name
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or a pointer to a path name of the directory to be opened. For more information
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on the Qlg_Path_Name_T structure, see <a href="../apiref/pns.htm">Path name
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format</a>.</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="opendir.htm">opendir()</a>--Open Directory<br>
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<br>
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</li>
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<li><a href="readdiru.htm">QlgReaddir()</a>--Read Directory Entry (using
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NLS-enabled path name)<br>
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<br>
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</li>
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<li><a href="spawnu.htm">QlgSpawn()</a>--Spawn Process (using NLS-enabled path
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name)<br>
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<br>
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</li>
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<li><a href="spawnpu.htm">QlgSpawnp()</a>--Spawn Process with Path (using
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NLS-enabled fileh 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 opens a 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 <sys/stat.h>
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#include <sys/types.h>
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#include <errno.h>
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#include <stdio.h>
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void traverse(char *fn, int indent) {
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DIR *dir;
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int count;
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struct stat info;
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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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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[1025]; /* This array size must be >= */
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/* the length of the path name or */
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/* this must be a pointer to the */
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/* path name. */
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};
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struct pnstruct path;
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struct pnstruct path_to_stat;
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char *temp_char_path[1025];
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/***************************************************************/
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/* Initialize Qlg_Path_Name_T structure, since the path name */
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/* was not in the Qlg_Path_Name_T format when this function */
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/* was called. */
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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_Name_Delimiter[0] = '/';
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path.qlg_struct.Path_Length = strlen(fn);
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memcpy(path.pn,fn,strlen(fn));
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for (count=0; count < indent; count++) printf(" ");
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printf("%s\n", fn);
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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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{
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path_to_stat = path;
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while ((entry = QlgReaddir(dir)) != NULL)
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{
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if
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(entry->d_lg_name[0] != '.')
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{
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/* Concat the components of the path name into a */
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/* Qlg_Path_Name_T structure that is used on the */
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/* next function that is called. Clear and */
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/* use a temporary buffer to ensure that only */
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/* characters returned by QlgReaddir() are */
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/* included in the concatenated path name */
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/* structure. */
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strcpy(path_to_stat.pn,path.pn);
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strcat(path_to_stat.pn, "/");
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memset(temp_char_path, 0x00,1025);
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memcpy(temp_char_path,
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entry->d_lg_name,entry->d_lg_qlg.Path_Length);
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strcat(path_to_stat.pn,(char *)&temp_char_path);
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/* Calculate the size of the path, including the */
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/* length of the path specified on the open, the */
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/* length of the name returned by QlgReaddir(), */
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/* and the delimiter. */
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path_to_stat.qlg_struct.Path_Length =
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(path.qlg_struct.Path_Length +
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entry->d_lg_qlg.Path_Length + 1);
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/* Call QlgStat() to determine if the path name */
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/* is a directory. */
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if (QlgStat((Qlg_Path_Name_T *)&path_to_stat,
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&info) != 0)
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{
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fprintf(stderr, "QlgStat() error on %s: %s\n",
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path_to_stat.pn,
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strerror(errno));
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}
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else if (S_ISDIR(info.st_mode))
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{
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/* this a directory so loop to open its objects.*/
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traverse(path_to_stat.pn, indent+1);
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}
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else printf(" %s\n",path_to_stat.pn);
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}
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}
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closedir(dir);
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}
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}
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main() {
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puts("Directory structure:");
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traverse("/etc", 0);
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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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Directory structure:
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/etc
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/etc/samples
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/etc/samples/IBM
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/etc/IBM
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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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