43 lines
2.5 KiB
HTML
43 lines
2.5 KiB
HTML
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
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<html lang="en">
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<meta http-equiv="Content-Style-Type" content="text/css">
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<link rel="stylesheet" href="../css_e.css" type="text/css" media="screen" title="ELM Default">
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<title>FatFs - FIL</title>
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</head>
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<body>
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<div class="para">
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<h2>FIL</h2>
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<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>
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<pre>
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<span class="k">typedef</span> <span class="k">struct</span> {
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FFOBJID obj; <span class="c">/* Object identifier */</span>
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BYTE flag; <span class="c">/* File object status flags */</span>
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BYTE err; <span class="c">/* Abort flag (error code) */</span>
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FSIZE_t fptr; <span class="c">/* File read/write pointer (Byte offset origin from top of the file) */</span>
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DWORD clust; <span class="c">/* Current cluster of fptr (One cluster behind if fptr is on the cluster boundary. Invalid if fptr == 0.) */</span>
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LBA_t sect; <span class="c">/* Current data sector (Can be invalid if fptr is on the cluster boundary.)*/</span>
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<span class="k">#if</span> !FF_FS_READONLY
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LBA_t dir_sect; <span class="c">/* Sector number containing the directory entry */</span>
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BYTE* dir_ptr; <span class="c">/* Ponter to the directory entry in the window */</span>
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<span class="k">#endif</span>
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<span class="k">#if</span> FF_USE_FASTSEEK
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DWORD* cltbl; <span class="c">/* Pointer to the cluster link map table (Nulled on file open. Set by application.) */</span>
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<span class="k">#endif</span>
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<span class="k">#if</span> !FF_FS_TINY
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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>
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<span class="k">#endif</span>
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} FIL;
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</pre>
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</div>
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<p class="foot"><a href="../00index_e.html">Return</a></p>
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</body>
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</html>
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