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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">
<html lang="ja">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Shift_JIS">
<meta http-equiv="Content-Style-Type" content="text/css">
<link rel="up" title="FatFs" href="../00index_j.html">
<link rel="stylesheet" href="../css_j.css" type="text/css" media="screen" title="ELM Default">
<title>FatFs - f_forward</title>
</head>
<body>
<div class="para">
<h2>f_forward</h2>
<p>t@Cf[^ǂݏoAMXg[ɒړ]܂B</p>
<pre>
FRESULT f_forward (
FIL* <em>FileObject</em>, /* t@CEIuWFNg\ */
UINT (*<em>Func</em>)(const BYTE*,UINT), /* f[^] */
UINT <em>ByteToFwd</em>, /* ]oCg */
UINT* <em>ByteFwd</em> /* ]ꂽoCg */
);
</pre>
</div>
<div class="para">
<h4></h4>
<dl class="par">
<dt>FileObject</dt>
<dd>t@CEIuWFNg\̂ւ̃|C^w肵܂B</dd>
<dt>Func</dt>
<dd>f[^n[U`ւ̃|C^w肵܂B̊̎dl̓TvQƂĂB</dd>
<dt>ByteToRead</dt>
<dd>]oCg(0`UINT̍ől)w肵܂B</dd>
<dt>ByteRead</dt>
<dd>ۂɓ]ꂽoCgi[ϐw|C^w肵܂B</dd>
</dl>
</div>
<div class="para">
<h4>߂l</h4>
<dl class="ret">
<dt>FR_OK (0)</dt>
<dd>IB</dd>
<dt>FR_DENIED</dt>
<dd>ǂݍ݃[hŊJt@CǂݍƂB</dd>
<dt>FR_DISK_ERR</dt>
<dd>fBXNEG[ɂ鎸sB</dd>
<dt>FR_INT_ERR</dt>
<dd>sFAT\܂͓G[ɂ鎸sB</dd>
<dt>FR_NOT_READY</dt>
<dd>fBAZbgĂȂȂǁAhCus\ԁB</dd>
<dt>FR_INVALID_OBJECT</dt>
<dd>ȃt@CEIuWFNgB</dd>
</dl>
</div>
<div class="para">
<h4></h4>
<p>t@C̃f[^obt@ɓǂݏoɑMXg[ɒړ]܂BAvP[VŃf[^Eobt@KvƂȂ̂ŁǍꂽŗLłB]JnʒúÃ݂t@CR/W|C^ɂȂ܂Bt@CR/W|C^͓]ꂽoCgi݂܂Bw肳ꂽoCg̓]Ƀt@C̏I[ɒBꍇMXg[rW[ɂȂꍇA<tt>*ByteFwd</tt><tt>ByteToFwd</tt>Ȃ܂B</p>
</div>
<div class="para">
<h4>Ή</h4>
<p><tt>_USE_FORWARD == 1</tt>ŁA<tt>_FS_TINY == 1</tt>̂ƂɎgp\łB</p>
</div>
<div class="para">
<h4>gpiI[fBIĐj</h4>
<pre>
/*-----------------------------------------------------------------------*/
/* f_forwardĂf[^M̗ */
/*-----------------------------------------------------------------------*/
UINT out_stream ( /* ߂l: ]ꂽoCg܂̓Xg[̏ */
const BYTE *p, /* ]f[^w|C^ */
UINT btf /* >0: ]s(oCg). 0: Xg[̏Ԃׂ */
)
{
UINT cnt = 0;
if (btf == 0) { /* ZXv */
/* Xg[̏ԂԂ (0: rW[, 1: fB) */
/* UAfBԂA]vŏȂƂ1oCg */
/* ]Ȃ f_forward FR_RW_ERROR ƂȂB */
if (FIFO_READY) cnt = 1;
}
else { /* ]v */
do { /* SẴoCg]邩AXg[rW[ɂȂ܂ŌJԂ */
FIFO_PORT = *p++;
cnt++;
} while (cnt < btf && FIFO_READY);
}
return cnt;
}
/*-----------------------------------------------------------------------*/
/* f_forward̎gp */
/*-----------------------------------------------------------------------*/
FRESULT play_file (
char *fn /* ĐI[fBIEt@Cw|C^ */
)
{
FRESULT rc;
FIL fil;
UINT dmy;
/* t@Cǂݏo[hŊJ */
rc = f_open(&fil, fn, FA_READ);
/* SẴf[^]邩G[܂ő */
while (rc == FR_OK && fil.fptr < fil.fsize) {
/* ق̏... */
/* I܂͗vɉăf[^Xg[ɑo */
rc = f_forward(&fil, out_stream, 1000, &dmy);
}
return rc; /* FR_OK: I, ق:ُI */
}
</pre>
</div>
<div class="para">
<h4>Q</h4>
<p><tt><a href="open.html">f_open</a>, <a href="gets.html">fgets</a>, <a href="write.html">f_write</a>, <a href="close.html">f_close</a>, <a href="sfile.html">FIL</a></tt></p>
</div>
<p class="foot"><a href="../00index_j.html">߂</a></p>
</body>
</html>
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