?? write.html
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<title>FatFs - f_write</title>
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<body>
<div class="para">
<h2>f_write</h2>
<p>The f_write writes data to a file.</p>
<pre>
FRESULT f_write (
FIL* <em>FileObject</em>, /* Pointer to the file object structure */
const void* <em>Buffer</em>, /* Pointer to the data to be written */
WORD <em>ByteToWrite</em>, /* Number of bytes to write */
WORD* <em>ByteWritten</em> /* Pointer to the variable to return number of bytes written */
);
</pre>
</div>
<div class="para">
<h4>Parameter</h4>
<dl class="par">
<dt>FileObject</dt>
<dd>Pointer to the open file object structure.</dd>
<dt>Buffer</dt>
<dd>Pointer to the data to be written.</dd>
<dt>ByteToWrite</dt>
<dd>Specifies number of bytes to write.</dd>
<dt>ByteWritten</dt>
<dd>Pointer to the WORD variable to return number of bytes written.</dd>
</dl>
</div>
<div class="para">
<h4>Return Values</h4>
<dl class="ret">
<dt>FR_OK (0)</dt>
<dd>The function succeeded.</dd>
<dt>FR_DENIED</dt>
<dd>The function denied due to the file has been opened in read only mode.</dd>
<dt>FR_RW_ERROR</dt>
<dd>Any error has occured in low level disk I/O layer.</dd>
<dt>FR_NOT_READY</dt>
<dd>The disk drive cannot work due to no medium in the drive or any other reason.</dd>
<dt>FR_INVALID_OBJECT</dt>
<dd>The file object is invalid.</dd>
</dl>
</div>
<div class="para">
<h4>Description</h4>
<p>The read/write pointer in the file object is increased in number of bytes written. The <tt>ByteWritten</tt> will become less than <tt>ByteToWrite</tt> when disk gets full during write function. This function is not supported in read-only configuration.</p>
</div>
<div class="para">
<h4>References</h4>
<p><tt><a href="open.html">f_open</a>, <a href="read.html">f_read</a>, <a href="close.html">f_close</a>, <a href="sfile.html">FIL</a></tt></p>
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