1<!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=utf-8"> 5<meta http-equiv="Content-Style-Type" content="text/css"> 6<link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default"> 7<title>FatFs - FIL</title> 8</head> 9 10<body> 11 12<div class="para"> 13<h2>FIL</h2> 14<p>The <tt>FIL</tt> structure (file object) holds the state of an open file. It is created by <tt>f_open</tt> function and discarded by <tt>f_close</tt> function. Application program <em>must not</em> modify any member in this structure except for <tt>cltbl</tt>, or the FAT volume will be collapsed. Note that a sector buffer is defined in this structure at non-tiny configuration (<tt><a href="config.html#fs_tiny">FF_FS_TINY</a> == 0</tt>), so that the <tt>FIL</tt> structures at that configuration should not be defined as auto variable.</p> 15 16<pre> 17<span class="k">typedef</span> <span class="k">struct</span> { 18 FFOBJID obj; <span class="c">/* Object identifier */</span> 19 BYTE flag; <span class="c">/* File object status flags */</span> 20 BYTE err; <span class="c">/* Abort flag (error code) */</span> 21 FSIZE_t fptr; <span class="c">/* File read/write pointer (Byte offset origin from top of the file) */</span> 22 DWORD clust; <span class="c">/* Current cluster of fptr (One cluster behind if fptr is on the cluster boundary. Invalid if fptr == 0.) */</span> 23 LBA_t sect; <span class="c">/* Current data sector (Can be invalid if fptr is on the cluster boundary.)*/</span> 24<span class="k">#if</span> !FF_FS_READONLY 25 LBA_t dir_sect; <span class="c">/* Sector number containing the directory entry */</span> 26 BYTE* dir_ptr; <span class="c">/* Ponter to the directory entry in the window */</span> 27<span class="k">#endif</span> 28<span class="k">#if</span> FF_USE_FASTSEEK 29 DWORD* cltbl; <span class="c">/* Pointer to the cluster link map table (Nulled on file open. Set by application.) */</span> 30<span class="k">#endif</span> 31<span class="k">#if</span> !FF_FS_TINY 32 BYTE buf[FF_MAX_SS]; <span class="c">/* File private data transfer buffer (Always valid if fptr is not on the sector boundary but can be invalid if fptr is on the sector boundary.) */</span> 33<span class="k">#endif</span> 34} FIL; 35</pre> 36 37</div> 38 39 40<p class="foot"><a href="../00index_e.html">Return</a></p> 41</body> 42</html> 43