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php-manual-zh-5.2.4-1mdv2008.1.noarch.rpm

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><H1
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>dio_seek</H1
><DIV
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><A
NAME="AEN36315"
></A
><P
>    (PHP 4 &#62;= 4.2.0, PHP 5 &#60;= 5.0.4)</P
>dio_seek&nbsp;--&nbsp;Seeks to pos on fd from whence</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN36318"
></A
><H2
>说明</H2
>int <B
CLASS="methodname"
>dio_seek</B
> ( resource fd, int pos [, int whence] )<BR
></BR
><P
>&#13;   The function <B
CLASS="function"
>dio_seek()</B
> is used to change the
   file position of the given file descriptor.  
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN36334"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>fd</CODE
></DT
><DD
><P
>&#13;       The file descriptor returned by <A
HREF="function.dio-open.html"
><B
CLASS="function"
>dio_open()</B
></A
>.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>pos</CODE
></DT
><DD
><P
>&#13;       The new position.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>whence</CODE
></DT
><DD
><P
>&#13;       Specifies how the position <CODE
CLASS="parameter"
>pos</CODE
> should be 
       interpreted:
       <P
></P
><UL
><LI
><P
>&#13;          <TT
CLASS="constant"
><B
>SEEK_SET</B
></TT
> (default) - specifies that 
          <CODE
CLASS="parameter"
>pos</CODE
> is specified from the beginning of the 
          file.
         </P
></LI
><LI
><P
>&#13;          <TT
CLASS="constant"
><B
>SEEK_CUR</B
></TT
> - Specifies that 
          <CODE
CLASS="parameter"
>pos</CODE
> is a count of characters from the current
          file position. This count may be positive or negative.
         </P
></LI
><LI
><P
>&#13;          <TT
CLASS="constant"
><B
>SEEK_END</B
></TT
> - Specifies that 
          <CODE
CLASS="parameter"
>pos</CODE
> is a count of characters from the end of
          the file. A negative count specifies a position within the current 
          extent of the file; a positive count specifies a position past the 
          current end. If you set the position past the current end, and 
          actually write data, you will extend the file with zeros up to that
          position.
         </P
></LI
></UL
>
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
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><A
NAME="AEN36368"
></A
><H2
>返回值</H2
><P
>&#13;  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN36371"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
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><DIV
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><A
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></A
><P
><B
>例 1. Positioning in a file</B
></P
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /><br />$fd </font><font color="#007700">= </font><font color="#0000BB">dio_open</font><font color="#007700">(</font><font color="#DD0000">'/dev/ttyS0'</font><font color="#007700">, </font><font color="#0000BB">O_RDWR</font><font color="#007700">);<br /><br /></font><font color="#0000BB">dio_seek</font><font color="#007700">(</font><font color="#0000BB">$fd</font><font color="#007700">, </font><font color="#0000BB">10</font><font color="#007700">, </font><font color="#0000BB">SEEK_SET</font><font color="#007700">);<br /></font><font color="#FF8000">// position is now at 10 characters from the start of the file<br /><br /></font><font color="#0000BB">dio_seek</font><font color="#007700">(</font><font color="#0000BB">$fd</font><font color="#007700">, -</font><font color="#0000BB">2</font><font color="#007700">, </font><font color="#0000BB">SEEK_CUR</font><font color="#007700">);<br /></font><font color="#FF8000">// position is now at 8 characters from the start of the file<br /><br /></font><font color="#0000BB">dio_seek</font><font color="#007700">(</font><font color="#0000BB">$fd</font><font color="#007700">, -</font><font color="#0000BB">5</font><font color="#007700">, </font><font color="#0000BB">SEEK_END</font><font color="#007700">);<br /></font><font color="#FF8000">// position is now at 5 characters from the end of the file<br /><br /></font><font color="#0000BB">dio_seek</font><font color="#007700">(</font><font color="#0000BB">$fd</font><font color="#007700">, </font><font color="#0000BB">10</font><font color="#007700">, </font><font color="#0000BB">SEEK_END</font><font color="#007700">);<br /></font><font color="#FF8000">// position is now at 10 characters past the end of the file. <br />// The 10 characters between the end of the file and the current<br />// position are filled with zeros.<br /><br /></font><font color="#0000BB">dio_close</font><font color="#007700">(</font><font color="#0000BB">$fd</font><font color="#007700">);<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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