96 lines
3.1 KiB
HTML
96 lines
3.1 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1">
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<meta http-equiv="Content-Style-Type" content="text/css">
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<link rel="up" title="FatFs" href="../00index_e.html">
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<link rel="alternate" hreflang="ja" title="Japanese" href="../ja/getfree.html">
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<link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default">
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<title>FatFs - f_getfree</title>
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</head>
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<body>
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<div class="para func">
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<h2>f_getfree</h2>
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<p>The f_getfree function gets number of the free clusters.</p>
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<pre>
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FRESULT f_getfree (
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const TCHAR* <span class="arg">path</span>, <span class="c">/* [IN] Logical drive number */</span>
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DWORD* <span class="arg">nclst</span>, <span class="c">/* [OUT] Number of free clusters */</span>
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FATFS** <span class="arg">fatfs</span> <span class="c">/* [OUT] Corresponding file system object */</span>
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);
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</pre>
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</div>
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<div class="para arg">
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<h4>Parameters</h4>
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<dl class="par">
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<dt>path</dt>
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<dd>Pinter to the null-terminated string that specifies the <a href="filename.html">logical drive</a>. A null-string means the current drive.</dd>
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<dt>nclst</dt>
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<dd>Pointer to the <tt>DWORD</tt> variable to store number of free clusters.</dd>
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<dt>fatfs</dt>
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<dd>Pointer to pointer that to store a pointer to the corresponding file system object.</dd>
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</dl>
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</div>
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<div class="para ret">
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<h4>Return Values</h4>
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<p>
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<a href="rc.html#ok">FR_OK</a>,
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<a href="rc.html#de">FR_DISK_ERR</a>,
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<a href="rc.html#ie">FR_INT_ERR</a>,
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<a href="rc.html#nr">FR_NOT_READY</a>,
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<a href="rc.html#id">FR_INVALID_DRIVE</a>,
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<a href="rc.html#ne">FR_NOT_ENABLED</a>,
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<a href="rc.html#ns">FR_NO_FILESYSTEM</a>,
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<a href="rc.html#tm">FR_TIMEOUT</a>
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</p>
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</div>
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<div class="para desc">
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<h4>Descriptions</h4>
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<p>The <tt>f_getfree()</tt> function gets number of free clusters on the drive. The member <tt>csize</tt> in the file system object is refrecting number of sectors per cluster, so that the free space in unit of sector can be calcurated with this. When FSInfo structure on FAT32 volume is not in sync, this function can return an incorrect free cluster count.</p>
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</div>
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<div class="para comp">
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<h4>QuickInfo</h4>
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<p>Available when <tt>_FS_READONLY == 0</tt> and <tt>_FS_MINIMIZE == 0</tt>.</p>
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</div>
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<div class="para use">
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<h4>Example</h4>
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<pre>
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FATFS *fs;
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DWORD fre_clust, fre_sect, tot_sect;
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<span class="c">/* Get volume information and free clusters of drive 1 */</span>
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res = f_getfree("1:", &fre_clust, &fs);
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if (res) die(res);
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<span class="c">/* Get total sectors and free sectors */</span>
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tot_sect = (fs->n_fatent - 2) * fs->csize;
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fre_sect = fre_clust * fs->csize;
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<span class="c">/* Print free space in unit of KiB (assuming 512 bytes/sector) */</span>
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printf("%lu KB total drive space.\n%lu KB available.\n",
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tot_sect / 2, fre_sect / 2);
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</pre>
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</div>
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<div class="para ref">
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<h4>See Also</h4>
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<p><tt><a href="sfatfs.html">FATFS</a></tt></p>
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</div>
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<p class="foot"><a href="../00index_e.html">Return</a></p>
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</body>
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</html>
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