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

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><H1
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>yaz_scan</H1
><DIV
CLASS="refnamediv"
><A
NAME="AEN248381"
></A
><P
>    (PHP 4 &#62;= 4.0.5, PECL)</P
>yaz_scan&nbsp;--&nbsp;Prepares for a scan</DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN248384"
></A
><H2
>说明</H2
>void <B
CLASS="methodname"
>yaz_scan</B
> ( resource id, string type, string startterm [, array flags] )<BR
></BR
><P
>&#13;   This function prepares for a Z39.50 Scan Request on the specified 
   connection.
  </P
><P
>&#13;   To actually transfer the Scan Request to the server and receive the
   Scan Response, <A
HREF="function.yaz-wait.html"
><B
CLASS="function"
>yaz_wait()</B
></A
> must be called. Upon
   completion of <A
HREF="function.yaz-wait.html"
><B
CLASS="function"
>yaz_wait()</B
></A
> call
   <A
HREF="function.yaz-error.html"
><B
CLASS="function"
>yaz_error()</B
></A
> and <A
HREF="function.yaz-scan-result.html"
><B
CLASS="function"
>yaz_scan_result()</B
></A
> to
   handle the response.
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN248407"
></A
><H2
>参数</H2
><P
>&#13;   <P
></P
><DIV
CLASS="variablelist"
><DL
><DT
><CODE
CLASS="parameter"
>id</CODE
></DT
><DD
><P
>&#13;       The connection resource returned by <A
HREF="function.yaz-connect.html"
><B
CLASS="function"
>yaz_connect()</B
></A
>.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>type</CODE
></DT
><DD
><P
>&#13;       Currently only type <TT
CLASS="literal"
>rpn</TT
> is supported.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>startterm</CODE
></DT
><DD
><P
>&#13;       Starting term point for the scan.
      </P
><P
>&#13;       The form in which the starting term is specified is given by parameter
       <CODE
CLASS="parameter"
>type</CODE
>.
      </P
><P
>&#13;       The syntax this parameter is similar to the RPN query as described in
       <A
HREF="function.yaz-search.html"
><B
CLASS="function"
>yaz_search()</B
></A
>. It consists of zero or more 
       <TT
CLASS="literal"
>@attr</TT
>-operator specifications, then followed by 
       exactly one token.
      </P
></DD
><DT
><CODE
CLASS="parameter"
>flags</CODE
></DT
><DD
><P
>&#13;       This optional parameter specifies additional information to control 
       the behaviour of the scan request. Three indexes are currently read 
       from the flags array:
       <TT
CLASS="literal"
>number</TT
> (number of terms requested),
       <TT
CLASS="literal"
>position</TT
> (preferred position of term) and
       <TT
CLASS="literal"
>stepSize</TT
> (preferred step size).
      </P
></DD
></DL
></DIV
>
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN248441"
></A
><H2
>返回值</H2
><P
>&#13;   无返回值。
  </P
></DIV
><DIV
CLASS="refsect1"
><A
NAME="AEN248444"
></A
><H2
>范例</H2
><P
>&#13;   <TABLE
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><TR
><TD
><DIV
CLASS="example"
><A
NAME="AEN248447"
></A
><P
><B
>例 1. PHP function that scans titles</B
></P
><TABLE
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><code><font color="#000000">
<font color="#0000BB">&lt;?php<br /></font><font color="#007700">function </font><font color="#0000BB">scan_titles</font><font color="#007700">(</font><font color="#0000BB">$id</font><font color="#007700">, </font><font color="#0000BB">$startterm</font><font color="#007700">) <br />{<br />&nbsp;&nbsp;</font><font color="#0000BB">yaz_scan</font><font color="#007700">(</font><font color="#0000BB">$id</font><font color="#007700">, </font><font color="#DD0000">"rpn"</font><font color="#007700">, </font><font color="#DD0000">"@attr 1=4 " </font><font color="#007700">. </font><font color="#0000BB">$startterm</font><font color="#007700">);<br />&nbsp;&nbsp;</font><font color="#0000BB">yaz_wait</font><font color="#007700">();<br />&nbsp;&nbsp;</font><font color="#0000BB">$errno </font><font color="#007700">= </font><font color="#0000BB">yaz_errno</font><font color="#007700">(</font><font color="#0000BB">$id</font><font color="#007700">);<br />&nbsp;&nbsp;if (</font><font color="#0000BB">$errno </font><font color="#007700">== </font><font color="#0000BB">0</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;</font><font color="#0000BB">$ar </font><font color="#007700">= </font><font color="#0000BB">yaz_scan_result</font><font color="#007700">(</font><font color="#0000BB">$id</font><font color="#007700">, &amp;</font><font color="#0000BB">$options</font><font color="#007700">);<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">'Scan ok; '</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;foreach (</font><font color="#0000BB">$options </font><font color="#007700">as </font><font color="#0000BB">$key </font><font color="#007700">=&gt; </font><font color="#0000BB">$val</font><font color="#007700">) {<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"$key = $val &amp;nbsp;"</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">'&lt;br /&gt;&lt;table&gt;'</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;while (list(</font><font color="#0000BB">$key</font><font color="#007700">, list(</font><font color="#0000BB">$k</font><font color="#007700">, </font><font color="#0000BB">$term</font><font color="#007700">, </font><font color="#0000BB">$tcount</font><font color="#007700">)) = </font><font color="#0000BB">each</font><font color="#007700">(</font><font color="#0000BB">$ar</font><font color="#007700">)) {<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;if (empty(</font><font color="#0000BB">$k</font><font color="#007700">)) continue;<br />&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"&lt;tr&gt;&lt;td&gt;$term&lt;/td&gt;&lt;td&gt;$tcount&lt;/td&gt;&lt;/tr&gt;"</font><font color="#007700">;<br />&nbsp;&nbsp;&nbsp;&nbsp;}<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">'&lt;/table&gt;'</font><font color="#007700">;<br />&nbsp;&nbsp;} else {<br />&nbsp;&nbsp;&nbsp;&nbsp;echo </font><font color="#DD0000">"Scan failed. Error: " </font><font color="#007700">. </font><font color="#0000BB">yaz_error</font><font color="#007700">(</font><font color="#0000BB">$id</font><font color="#007700">) . </font><font color="#DD0000">"&lt;br /&gt;"</font><font color="#007700">;<br />&nbsp;&nbsp;}<br />}<br /></font><font color="#0000BB">?&gt;</font>
</font>
</code></TD
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