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+<!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/write.html">
+<link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default">
+<title>FatFs - f_write</title>
+</head>
+
+<body>
+
+<div class="para func">
+<h2>f_write</h2>
+<p>The f_write writes data to a file.</p>
+<pre>
+FRESULT f_write (
+ FIL* <span class="arg">fp</span>, <span class="c">/* [IN] Pointer to the file object structure */</span>
+ const void* <span class="arg">buff</span>, <span class="c">/* [IN] Pointer to the data to be written */</span>
+ UINT <span class="arg">btw</span>, <span class="c">/* [IN] Number of bytes to write */</span>
+ UINT* <span class="arg">bw</span> <span class="c">/* [OUT] Pointer to the variable to return number of bytes written */</span>
+);
+</pre>
+</div>
+
+<div class="para arg">
+<h4>Parameters</h4>
+<dl class="par">
+<dt>fp</dt>
+<dd>Pointer to the open file object structure.</dd>
+<dt>buff</dt>
+<dd>Pointer to the data to be written.</dd>
+<dt>btw</dt>
+<dd>Specifies number of bytes to write in range of <tt>UINT</tt> type.</dd>
+<dt>bw</dt>
+<dd>Pointer to the <tt>UINT</tt> variable to return the number of bytes written. The value is always valid after the function call regardless of the result.</dd>
+</dl>
+</div>
+
+
+<div class="para ret">
+<h4>Return Values</h4>
+<p>
+<a href="rc.html#ok">FR_OK</a>,
+<a href="rc.html#de">FR_DISK_ERR</a>,
+<a href="rc.html#ie">FR_INT_ERR</a>,
+<a href="rc.html#nr">FR_NOT_READY</a>,
+<a href="rc.html#io">FR_INVALID_OBJECT</a>,
+<a href="rc.html#tm">FR_TIMEOUT</a>
+</p>
+</div>
+
+
+<div class="para desc">
+<h4>Description</h4>
+<p>The read/write pointer of the file object advances number of bytes written. After the function succeeded, <tt class="arg">*bw</tt> should be checked to detect the disk full. In case of <tt class="arg">*bw</tt> is less than <tt class="arg">btw</tt>, it means the volume got full during the write operation. The function can take a time when the volume is full or close to full.</p>
+</div>
+
+
+<div class="para comp">
+<h4>QuickInfo</h4>
+<p>Available when <tt>_FS_READONLY == 0</tt>.</p>
+</div>
+
+
+<div class="para ref">
+<h4>See Also</h4>
+<p><tt><a href="open.html">f_open</a>, <a href="read.html">f_read</a>, <a href="putc.html">fputc</a>, <a href="puts.html">fputs</a>, <a href="printf.html">fprintf</a>, <a href="close.html">f_close</a>, <a href="sfile.html">FIL</a></tt></p>
+</div>
+
+<p class="foot"><a href="../00index_e.html">Return</a></p>
+</body>
+</html>