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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="alternate" hreflang="en" title="English" href="../en/forward.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 func">
<h2>f_forward</h2>
<p>�t�@�C������f�[�^��ǂݏo���A���M�X�g���[���ɒ��ړ]�����܂��B</p>
<pre>
FRESULT f_forward (
FIL* <span class="arg">fp</span>, <span class="c">/* [IN] �t�@�C���E�I�u�W�F�N�g�\���� */</span>
UINT (*<span class="arg">func</span>)(const BYTE*,UINT), <span class="c">/* [IN] �f�[�^�]���� */</span>
UINT <span class="arg">btf</span>, <span class="c">/* [IN] �]������o�C�g�� */</span>
UINT* <span class="arg">bf</span> <span class="c">/* [OUT] �]�����ꂽ�o�C�g�� */</span>
);
</pre>
</div>
<div class="para arg">
<h4>����</h4>
<dl class="par">
<dt>fp</dt>
<dd>�t�@�C���E�I�u�W�F�N�g�\���̂ւ̃|�C���^���w�肵�܂��B</dd>
<dt>func</dt>
<dd>�f�[�^��n�����[�U��`���ւ̃|�C���^���w�肵�܂��B���̊��̎d�l�̓T���v�����Q�Ƃ��Ă��������B</dd>
<dt>btf</dt>
<dd>�]������o�C�g��(0�`UINT�̍ő�l)���w�肵�܂��B</dd>
<dt>bf</dt>
<dd>���ۂɓ]�����ꂽ�o�C�g�����i�[����ϐ����w���|�C���^���w�肵�܂��B</dd>
</dl>
</div>
<div class="para ret">
<h4>�߂�l</h4>
<p>
<a href="rc.html#ok">FR_OK</a>,
<a href="rc.html#de">FR_DISK_ERR</a>,
<a href="rc.html#ie">FR_INT_ERR</a>,
<a href="rc.html#nr">FR_NOT_READY</a>,
<a href="rc.html#de">FR_DENIED</a>,
<a href="rc.html#io">FR_INVALID_OBJECT</a>,
<a href="rc.html#tm">FR_TIMEOUT</a>
</p>
</div>
<div class="para desc">
<h4>���</h4>
<p>�t�@�C���̃f�[�^���o�b�t�@�ɓǂݏo�����ɑ��M�X�g���[���ɒ��ړ]�����܂��B�A�v���P�[�V�������Ńf�[�^�E�o�b�t�@��K�v�Ƃ��Ȃ��̂ŁA�������̌���ꂽ���ŗL���ł��B���[�h/���C�g�E�|�C���^�͓]�����ꂽ�o�C�g�������i�݂܂��B�w�肳�ꂽ�o�C�g���̓]�����Ƀt�@�C���̏I�[�ɒB�����ꍇ��M�X�g���[�����r�W�[�ɂȂ����ꍇ�A<tt class="arg">*bf</tt>��<tt class="arg">btf</tt>�����������Ȃ�܂��B</p>
</div>
<div class="para comp">
<h4>�Ή����</h4>
<p><tt>_USE_FORWARD == 1</tt>�ŁA����<tt>_FS_TINY == 1</tt>�̂Ƃ��Ɏg�p�\�ł��B</p>
</div>
<div class="para use">
<h4>�g�p��i�I�[�f�B�I���j</h4>
<pre>
<span class="c">/*-----------------------------------------------------------------------*/</span>
<span class="c">/* f_forward������Ă��f�[�^���M���̗� */</span>
<span class="c">/*-----------------------------------------------------------------------*/</span>
UINT out_stream ( <span class="c">/* �߂�l: �]�����ꂽ�o�C�g���܂��̓X�g���[���̏�� */</span>
const BYTE *p, <span class="c">/* �]������f�[�^���w���|�C���^ */</span>
UINT btf <span class="c">/* >0: �]�����s��(�o�C�g��). 0: �X�g���[���̏�Ԃׂ� */</span>
)
{
UINT cnt = 0;
if (btf == 0) { <span class="c">/* �Z���X�v�� */</span>
<span class="c">/* �X�g���[���̏�Ԃ�Ԃ� (0: �r�W�[, 1: ���f�B) */</span>
<span class="c">/* ��U�A���f�B��Ԃ�����A�����]���v���ŏ��Ȃ��Ƃ�1�o�C�g�� */</span>
<span class="c">/* �]������Ȃ��� f_forward���� FR_INT_ERR �ƂȂ�B */</span>
if (FIFO_READY) cnt = 1;
}
else { <span class="c">/* �]���v�� */</span>
do { <span class="c">/* �S�Ẵo�C�g��]�����邩�A�X�g���[�����r�W�[�ɂȂ�܂ŌJ��Ԃ� */</span>
FIFO_PORT = *p++;
cnt++;
} while (cnt < btf && FIFO_READY);
}
return cnt;
}
<span class="c">/*-----------------------------------------------------------------------*/</span>
<span class="c">/* f_forward���̎g�p�� */</span>
<span class="c">/*-----------------------------------------------------------------------*/</span>
FRESULT play_file (
char *fn <span class="c">/* ������I�[�f�B�I�E�t�@�C�������w���|�C���^ */</span>
)
{
FRESULT rc;
FIL fil;
UINT dmy;
<span class="c">/* �t�@�C����ǂݏo�����[�h�ŊJ�� */</span>
rc = f_open(&fil, fn, FA_READ);
if (rc) return rc;
<span class="c">/* �S�Ẵf�[�^���]������邩�G���[����������܂ő����� */</span>
while (rc == FR_OK && fil.fptr < fil.fsize) {
<span class="c">/* �ق��̏���... */</span>
<span class="c">/* ����I�܂��͗v���ɉ����ăf�[�^���X�g���[���ɑ��o���� */</span>
rc = f_forward(&fil, out_stream, 1000, &dmy);
}
<span class="c">/* �t�@�C������Ė߂� */</span>
f_close(&fil);
return rc;
}
</pre>
</div>
<div class="para ref">
<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>
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