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| <title>FatFs - f_write</title> | |
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| <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 */ | |
| UINT <em>ByteToWrite</em>, /* Number of bytes to write */ | |
| UINT* <em>ByteWritten</em> /* Pointer to the variable to return number of bytes written */ | |
| ); | |
| </pre> | |
| </div> | |
| <div class="para"> | |
| <h4>Parameters</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 in range of UINT.</dd> | |
| <dt>ByteWritten</dt> | |
| <dd>Pointer to the UINT 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"> | |
| <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 non-write mode.</dd> | |
| <dt>FR_DISK_ERR</dt> | |
| <dd>The function failed due to an error in the disk function.</dd> | |
| <dt>FR_INT_ERR</dt> | |
| <dd>The function failed due to a wrong FAT structure or an internal error.</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 R/W pointer in the file object is increased in number of bytes written. After the function succeeded, <tt>*ByteWritten</tt> should be checked to detect the disk full. In case of <tt>*ByteWritten < ByteToWrite</tt>, it means the volume got full during the write operation.</p> | |
| </div> | |
| <div class="para"> | |
| <h4>QuickInfo</h4> | |
| <p>Available when <tt>_FS_READONLY == 0</tt>.</p> | |
| </div> | |
| <div class="para"> | |
| <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> | |
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