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6 <link rel="up" title="FatFs" href="../00index_e.html">
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8 <title>FatFs - f_write</title>
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15 <p>The f_write writes data to a file.</p>
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18 FIL* <em>FileObject</em>, /* Pointer to the file object structure */
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19 const void* <em>Buffer</em>, /* Pointer to the data to be written */
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20 UINT <em>ByteToWrite</em>, /* Number of bytes to write */
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21 UINT* <em>ByteWritten</em> /* Pointer to the variable to return number of bytes written */
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30 <dd>Pointer to the open file object structure.</dd>
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32 <dd>Pointer to the data to be written.</dd>
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33 <dt>ByteToWrite</dt>
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34 <dd>Specifies number of bytes to write in range of UINT.</dd>
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35 <dt>ByteWritten</dt>
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36 <dd>Pointer to the UINT variable to return number of bytes written.</dd>
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42 <h4>Return Values</h4>
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45 <dd>The function succeeded.</dd>
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47 <dd>The function denied due to the file has been opened in non-write mode.</dd>
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48 <dt>FR_DISK_ERR</dt>
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49 <dd>The function failed due to an error in the disk function.</dd>
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51 <dd>The function failed due to a wrong FAT structure or an internal error.</dd>
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52 <dt>FR_NOT_READY</dt>
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53 <dd>The disk drive cannot work due to no medium in the drive or any other reason.</dd>
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54 <dt>FR_INVALID_OBJECT</dt>
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55 <dd>The file object is invalid.</dd>
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61 <h4>Description</h4>
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62 <p>The read/write pointer in the file object is increased in number of bytes written. After the function succeeded, <tt>*ByteWritten</tt> should be checked to detect disk full. In case of <tt>*ByteWritten < ByteToWrite</tt>, it means the disk got full during write operation.</p>
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63 <p>This function is not available in read-only configuration.</p>
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69 <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>
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72 <p class="foot"><a href="../00index_e.html">Return</a></p>
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