| 1 |
606 |
jeremybenn |
<!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=iso-8859-1">
|
| 5 |
|
|
<meta http-equiv="Content-Style-Type" content="text/css">
|
| 6 |
|
|
<link rel="up" title="FatFs" href="../00index_e.html">
|
| 7 |
|
|
<link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default">
|
| 8 |
|
|
<title>FatFs - f_printf</title>
|
| 9 |
|
|
</head>
|
| 10 |
|
|
|
| 11 |
|
|
<body>
|
| 12 |
|
|
|
| 13 |
|
|
<div class="para">
|
| 14 |
|
|
<h2>f_printf</h2>
|
| 15 |
|
|
<p>The f_printf function writes formatted string to the file.</p>
|
| 16 |
|
|
<pre>
|
| 17 |
|
|
int f_printf (
|
| 18 |
|
|
FIL* <em>FileObject</em>, /* File object */
|
| 19 |
|
|
const char* <em>Foramt</em>, /* Format stirng */
|
| 20 |
|
|
...
|
| 21 |
|
|
);
|
| 22 |
|
|
</pre>
|
| 23 |
|
|
</div>
|
| 24 |
|
|
|
| 25 |
|
|
<div class="para">
|
| 26 |
|
|
<h4>Parameters</h4>
|
| 27 |
|
|
<dl class="par">
|
| 28 |
|
|
<dt>FileObject</dt>
|
| 29 |
|
|
<dd>Pointer to the open file object structure.</dd>
|
| 30 |
|
|
<dt>Format</dt>
|
| 31 |
|
|
<dd>Pointer to the null-terminated format string.</dd>
|
| 32 |
|
|
<dt>...</dt>
|
| 33 |
|
|
<dd>Optional arguments.</dd>
|
| 34 |
|
|
|
| 35 |
|
|
</dl>
|
| 36 |
|
|
</div>
|
| 37 |
|
|
|
| 38 |
|
|
|
| 39 |
|
|
<div class="para">
|
| 40 |
|
|
<h4>Return Values</h4>
|
| 41 |
|
|
<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</tt> will be returned.</p>
|
| 42 |
|
|
</div>
|
| 43 |
|
|
|
| 44 |
|
|
|
| 45 |
|
|
<div class="para">
|
| 46 |
|
|
<h4>Description</h4>
|
| 47 |
|
|
<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>
|
| 48 |
|
|
<ul>
|
| 49 |
|
|
<li>Type: <tt>c s d u X</tt></li>
|
| 50 |
|
|
<li>Size: <tt>l</tt></li>
|
| 51 |
|
|
<li>Flag: <tt>0</tt></li>
|
| 52 |
|
|
</ul>
|
| 53 |
|
|
</div>
|
| 54 |
|
|
|
| 55 |
|
|
|
| 56 |
|
|
<div class="para">
|
| 57 |
|
|
<h4>QuickInfo</h4>
|
| 58 |
|
|
<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>
|
| 59 |
|
|
</div>
|
| 60 |
|
|
|
| 61 |
|
|
|
| 62 |
|
|
<div class="para">
|
| 63 |
|
|
<h4>Example</h4>
|
| 64 |
|
|
<pre>
|
| 65 |
|
|
f_printf(&fil, "%6d", -200); /* " -200" */
|
| 66 |
|
|
f_printf(&fil, "%02u", 5); /* "05" */
|
| 67 |
|
|
f_printf(&fil, "%ld", 12345678L); /* "12345678" */
|
| 68 |
|
|
f_printf(&fil, "%08lX", 1194684UL); /* "00123ABC" */
|
| 69 |
|
|
f_printf(&fil, "%s", "String"); /* "String" */
|
| 70 |
|
|
f_printf(&fil, "%c", 'a'); /* "a" */
|
| 71 |
|
|
</pre>
|
| 72 |
|
|
</div>
|
| 73 |
|
|
|
| 74 |
|
|
|
| 75 |
|
|
<div class="para">
|
| 76 |
|
|
<h4>See Also</h4>
|
| 77 |
|
|
<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>
|
| 78 |
|
|
</div>
|
| 79 |
|
|
|
| 80 |
|
|
<p class="foot"><a href="../00index_e.html">Return</a></p>
|
| 81 |
|
|
</body>
|
| 82 |
|
|
</html>
|
