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.
86 lines
2.9 KiB
HTML
86 lines
2.9 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/printf.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_printf</title>
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</head>
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<body>
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<div class="para">
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<h2>f_printf</h2>
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<p>The f_printf function writes formatted string to the file.</p>
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<pre>
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int f_printf (
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FIL* <em>FileObject</em>, <span>/* File object */</span>
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const TCHAR* <em>Foramt</em>, <span>/* Format stirng */</span>
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...
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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>Parameters</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 structure.</dd>
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<dt>Format</dt>
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<dd>Pointer to the null terminated format string.</dd>
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<dt>...</dt>
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<dd>Optional arguments.</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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<p>When the function succeeded, number of characters written is returned. When the function failed due to disk full or any error, an <tt>EOF (-1)</tt> will be returned.</p>
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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_printf() is a wrapper function of <a href="putc.html">f_putc()</a> and <a href="puts.html">f_puts()</a>. The format control directive is a sub-set of standard library shown as follos:</p>
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<ul>
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<li>Type: <tt>c C s S d D u U x X b B</tt></li>
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<li>Size: <tt>l L</tt></li>
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<li>Flag: <tt>0</tt></li>
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</ul>
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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>_USE_STRFUNC</tt> is 1 or 2. When it is set to 2, <tt>'\n'</tt>s contained in the output are converted to <tt>"\r\n"</tt>.</p>
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<p>When the FatFs is configured to Unicode API (<tt>_LFN_UNICODE == 1</tt>), the generated UCS-2 characters are written to the file in UTF-8 encoding. If not the case, the byte characters will be written directly.</p>
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</div>
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<div class="para">
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<h4>Example</h4>
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<pre>
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f_printf(&fil, "%6d", -200); <span>/* " -200" */</span>
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f_printf(&fil, "%02u", 5); <span>/* "05" */</span>
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f_printf(&fil, "%ld", 12345678L); <span>/* "12345678" */</span>
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f_printf(&fil, "%08lX", 1194684UL); <span>/* "00123ABC" */</span>
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f_printf(&fil, "%08b", 0x55); <span>/* "01010101" */</span>
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f_printf(&fil, "%s", "String"); <span>/* "String" */</span>
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f_printf(&fil, "%c", 'a'); <span>/* "a" */</span>
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</pre>
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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="putc.html">f_putc</a>, <a href="puts.html">f_puts</a>, <a href="gets.html">f_gets</a>, <a href="close.html">f_close</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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