1<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd"> 2<html lang="en"> 3<head> 4<meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 5<meta http-equiv="Content-Style-Type" content="text/css"> 6<link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default"> 7<title>FatFs - f_chdir</title> 8</head> 9 10<body> 11 12<div class="para func"> 13<h2>f_chdir</h2> 14<p>The <tt>f_chdir</tt> function changes the current directory of the logical drive.</p> 15<pre> 16FRESULT f_chdir ( 17 const TCHAR* <span class="arg">path</span> <span class="c">/* [IN] Path name */</span> 18); 19</pre> 20</div> 21 22<div class="para arg"> 23<h4>Parameters</h4> 24<dl class="par"> 25<dt>path</dt> 26<dd>Pointer to the null-terminated string that specifies the <a href="filename.html">directory</a> to be set as current directory.</dd> 27</dl> 28</div> 29 30 31<div class="para ret"> 32<h4>Return Values</h4> 33<p> 34<a href="rc.html#ok">FR_OK</a>, 35<a href="rc.html#de">FR_DISK_ERR</a>, 36<a href="rc.html#ie">FR_INT_ERR</a>, 37<a href="rc.html#nr">FR_NOT_READY</a>, 38<a href="rc.html#np">FR_NO_PATH</a>, 39<a href="rc.html#in">FR_INVALID_NAME</a>, 40<a href="rc.html#id">FR_INVALID_DRIVE</a>, 41<a href="rc.html#ne">FR_NOT_ENABLED</a>, 42<a href="rc.html#ns">FR_NO_FILESYSTEM</a>, 43<a href="rc.html#tm">FR_TIMEOUT</a>, 44<a href="rc.html#nc">FR_NOT_ENOUGH_CORE</a> 45</p> 46</div> 47 48 49<div class="para desc"> 50<h4>Description</h4> 51<p>The <tt>f_chdir</tt> function changes the current directory of the logical drive. Also the current drive will be changed when in Unix style drive prefix, <tt><a href="config.html#str_volume_id">FF_STR_VOLUME_ID</a> == 2</tt>. The current directory of each logical drive is initialized to the root directory on mount.</p> 52<p>Note that the current directory is retained in the each file system object and the current drive is retained in a static variable, so that it also affects other tasks that use the file functions.</p> 53</div> 54 55 56<div class="para comp"> 57<h4>QuickInfo</h4> 58<p>Available when <tt><a href="config.html#fs_rpath">FF_FS_RPATH</a> >= 1</tt>.</p> 59</div> 60 61 62<div class="para use"> 63<h4>Example</h4> 64<pre> 65 <span class="c">/* Change current direcoty of the current drive ("dir1" under root directory) */</span> 66 <em>f_chdir</em>("/dir1"); 67 68 <span class="c">/* Change current direcoty of current drive (parent directory of drive 2) */</span> 69 <em>f_chdir</em>("2:.."); 70 71 <span class="c">/* Change current direcoty of the drive "sdcard" (at DOS/Windows style volume ID) */</span> 72 <em>f_chdir</em>("sdcard:/dir1"); 73 74 <span class="c">/* Change current direcoty of the drive "flash" and set it as current drive (at Unix style volume ID) */</span> 75 <em>f_chdir</em>("/flash/dir1"); 76</pre> 77</div> 78 79<div class="para ref"> 80<h4>See Also</h4> 81<p><tt><a href="chdrive.html">f_chdrive</a>, <a href="getcwd.html">f_getcwd</a></tt></p> 82</div> 83 84 85<p class="foot"><a href="../00index_e.html">Return</a></p> 86</body> 87</html> 88