72 lines
2.0 KiB
HTML
72 lines
2.0 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
|
|
<html lang="en">
|
|
<head>
|
|
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
|
|
<meta http-equiv="Content-Style-Type" content="text/css">
|
|
<link rel="up" title="FatFs" href="../00index_e.html">
|
|
<link rel="alternate" hreflang="ja" title="Japanese" href="../ja/chdrive.html">
|
|
<link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default">
|
|
<title>FatFs - f_chdrive</title>
|
|
</head>
|
|
|
|
<body>
|
|
|
|
<div class="para func">
|
|
<h2>f_chdrive</h2>
|
|
<p>The f_chdrive function changes the current drive.</p>
|
|
<pre>
|
|
FRESULT f_chdrive (
|
|
const TCHAR* <span class="arg">path</span> <span class="c">/* [IN] Logical drive number */</span>
|
|
);
|
|
</pre>
|
|
</div>
|
|
|
|
<div class="para arg">
|
|
<h4>Parameters</h4>
|
|
<dl class="par">
|
|
<dt>path</dt>
|
|
<dd>Specifies the <a href="filename.html">logical drive number</a> to be set as the current drive.</dd>
|
|
</dl>
|
|
</div>
|
|
|
|
|
|
<div class="para ret">
|
|
<h4>Return Values</h4>
|
|
<p>
|
|
<a href="rc.html#ok">FR_OK</a>,
|
|
<a href="rc.html#id">FR_INVALID_DRIVE</a>
|
|
</p>
|
|
</div>
|
|
|
|
|
|
<div class="para desc">
|
|
<h4>Description</h4>
|
|
<p>The <tt>f_chdrive</tt> function changes the current drive. The initial value of the current drive number is 0. Note that the current drive is retained in a static variable so that it also affects other tasks that using the file functions.</p>
|
|
</div>
|
|
|
|
<div class="para comp">
|
|
<h4>QuickInfo</h4>
|
|
<p>Available when <tt>FF_FS_RPATH >= 1</tt> and <tt>FF_VOLUMES >= 2</tt>.</p>
|
|
</div>
|
|
|
|
|
|
<div class="para use">
|
|
<h4>Example</h4>
|
|
<pre>
|
|
<em>f_chdrive</em>("2:"); <span class="c">/* Set current drive to drive 2 */</span>
|
|
|
|
<em>f_chdrive</em>(""); <span class="c">/* No effect (set current drive to current drive) */</span>
|
|
|
|
</pre>
|
|
</div>
|
|
|
|
|
|
<div class="para ref">
|
|
<h4>See Also</h4>
|
|
<p><tt><a href="chdir.html">f_chdir</a>, <a href="getcwd.html">f_getcwd</a></tt></p>
|
|
</div>
|
|
|
|
<p class="foot"><a href="../00index_e.html">Return</a></p>
|
|
</body>
|
|
</html>
|