<!doctype html public "-//w3c//dtd html 4.0 transitional//en"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <meta name="GENERATOR" content="Mozilla/4.77C-CCK-MCD Caldera Systems OpenLinux [en] (X11; U; Linux 2.4.2 i686) [Netscape]"> <title>OpenSLP Programmers Guide - SLPAttrCallback</title> </head> <body text="#000000" bgcolor="#FFFFFF" link="#0000EF" vlink="#51188E" alink="#FF0000"> <h2> SLPAttrCallback</h2> <hr WIDTH="100%"> <h3> Declaration</h3> <tt>typedef <a href="SLPTypes.html#SLPBoolean">SLPBoolean</a> SLPAttrCallback( <a href="SLPTypes.html#SLPHandle">SLPHandle</a> <a href="#hslp">hslp</a>,</tt> <br><tt> const char* attrlist,</tt> <br><tt> <a href="SLPTypes.html#SLPError">SLPError</a> <a href="#errcode">errcode</a>,</tt> <br><tt> void* <a href="#cookie">cookie</a> )</tt> <h3> Description</h3> The <tt>SLPAttrCallback</tt> type is the type of the callback function passed as a parameter to the <tt><a href="SLPFindAttrs.html">SLPFindAttrs()</a></tt> function. The behavior of the library is differs depending on whether the attribute request was by Service URL or by service type. <p>If the <tt><a href="SLPFindAttrs.html">SLPFindAttrs()</a></tt> function was called with a Service URL, then the callback is called once regardless of whether the handle was opened asynchronously or synchronously. The <tt>attrlist</tt> parameter will contain a comma separated list of attributes. <p>If the <tt><a href="SLPFindAttrs.html">SLPFindAttrs()</a></tt> function was called with a service type, then the callback called is until no more results are available. The <tt>attrlist</tt> parameter will contain a comma separated list of attributes. Returns will be collated to remove duplicates if <tt><a href="SLPFindAttrs.html">SLPFindAttrs()</a></tt> was called synchronously. If it was called asynchronously the <tt>attrlist</tt> may return duplicates. <h3> Parameters</h3> <table BORDER CELLPADDING=5 NOSAVE > <tr VALIGN=TOP NOSAVE> <td NOSAVE><a NAME="hslp"></a><tt>hslp</tt></td> <td NOSAVE>The language specific <tt>SLPHandle</tt> that was passed into the <tt>SLPFindAttrs()</tt> function.</td> </tr> <tr VALIGN=TOP NOSAVE> <td><a NAME="attrlist"></a><tt>attrlist</tt></td> <td NOSAVE>Pointer to a buffer containing a comma separated null terminated list of attribute id/value assignments in SLP wire format "(attr-id=attr-value-list)". </td> </tr> <tr VALIGN=TOP NOSAVE> <td><a NAME="errcode"></a><tt>errcode</tt></td> <td NOSAVE>An error code indicating if an error occurred during the operation. The callback should check this error code before processing the parameters. </td> </tr> <tr VALIGN=TOP NOSAVE> <td NOSAVE><a NAME="cookie"></a><tt>cookie</tt></td> <td NOSAVE>The same cookie that was passed as a parameter to the <tt>SLPFindAttrs()</tt> call</td> </tr> <caption ALIGN=BOTTOM> </caption> </table> <h3> Returns</h3> The callback should return <tt>SLP_TRUE</tt> if more data is desired. The callback may continue to return <tt>SLP_TRUE</tt> until it is called with an <tt>errcode</tt> of <tt><a href="SLPError.html#SLP_LAST_CALL">SLP_LAST_CALL</a></tt>. If no more data is requested the callback should return <tt>SLP_FALSE</tt>.. Since discovery of attributes by service-type is not supported, there is really no reason to return anything but <tt>SLP_FALSE</tt> from the SLPAttrCallback(). <br> <h3> Status</h3> <table CELLPADDING=5 NOSAVE > <tr VALIGN=TOP NOSAVE> <td NOSAVE>OpenSLP 1.0.0</td> <td NOSAVE><tt>SLPAttrCallback</tt> function is implemented as specified by RFC 2614</td> </tr> </table> <h3> See Also</h3> <a href="/Syntax.html">Syntax</a>, <a href="/Callbacks.html">Callbacks</a> </body> </html>
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