savelij13
46155916b1
- Added a memory configuration option. (_USE_LFN) - Added file lock feature. (_FS_SHARE) - Added fast seek feature. (_USE_FASTSEEK) - Changed some types on the API, XCHAR->TCHAR. - Changed fname member in the FILINFO structure on Unicode cfg. - String functions support UTF-8 encoding files on Unicode cfg.
73 lines
2.0 KiB
HTML
73 lines
2.0 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/truncate.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_truncate</title>
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</head>
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<body>
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<div class="para">
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<h2>f_truncate</h2>
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<p>The f_truncate function truncates the file size.</p>
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<pre>
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FRESULT f_truncate (
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FIL* <em>FileObject</em> <span>/* Pointer to the file object */</span>
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);
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</pre>
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</div>
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<div class="para">
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<h4>Parameter</h4>
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<dl class="par">
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<dt>FileObject</dt>
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<dd>Pointer to the open file object to be truncated.</dd>
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</dl>
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</div>
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<div class="para">
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<h4>Return Values</h4>
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<dl class="ret">
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<dt>FR_OK (0)</dt>
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<dd>The function succeeded.</dd>
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<dt>FR_DENIED</dt>
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<dd>The file has been opened in read-only mode.</dd>
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<dt>FR_DISK_ERR</dt>
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<dd>The function failed due to an error in the disk function.</dd>
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<dt>FR_INT_ERR</dt>
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<dd>The function failed due to a wrong FAT structure or an internal error.</dd>
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<dt>FR_NOT_READY</dt>
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<dd>The disk drive cannot work due to no medium in the drive or any other reason.</dd>
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<dt>FR_INVALID_OBJECT</dt>
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<dd>The file object is invalid.</dd>
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</dl>
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</div>
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<div class="para">
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<h4>Description</h4>
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<p>The f_truncate function truncates the file size to the current file R/W point. When the file R/W pointer is already pointing end of the file, this function has no effect.</p>
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</div>
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<div class="para">
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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">
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<h4>See Also</h4>
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<p><tt><a href="open.html">f_open</a>, <a href="lseek.html">f_lseek</a>, <a href="sfile.html">FIL</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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