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<!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 - SLPFindAttrs</title></head><body text="#000000" bgcolor="#FFFFFF" link="#0000EF" vlink="#51188E" alink="#FF0000"><h2>SLPFindAttrs</h2><hr WIDTH="100%"><h3>Declaration</h3><tt>#include <slp.h></tt><p><tt><a href="/SLPError.html">SLPError</a> SLPFindAttrs( <a href="SLPTypes.html#SLPHandle">SLPHandle</a><a href="#hslp">hslp</a>,</tt><br><tt> const char* srvurl,</tt><br><tt> const char* <a href="#scopelist">scopelist</a>,</tt><br><tt> const char* attrids,</tt><br><tt> <a href="SLPAttrCallback.html">SLPAttrCallback</a> <a href="#callback">callback</a>,</tt><br><tt> void* <a href="#cookie">cookie</a>)</tt><h3>Description</h3>This function returns service attributes matching the <tt>attrids</tt>for the indicated Service URL or service type. OpenSLP doesnot support location of attributes by service type with <tt>attrids</tt>containing wildcards (see status below).<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> on which to searchfor attributes the service.</td></tr><tr VALIGN=TOP NOSAVE><td NOSAVE><a NAME="srvurlorsrvtype"></a><tt>srvurl</tt></td><td NOSAVE>The service URL of the service to the attributes of. See<a href="Syntax.html#Service Type">Syntax</a>for more information SLP Service URLs.</td></tr><tr VALIGN=TOP NOSAVE><td NOSAVE><a NAME="attrids"></a><tt>attrids</tt></td><td>A comma separated list of attribute ids to return. Use the empty string("") for all attributes. Wildcards are not supported.</td></tr><tr VALIGN=TOP NOSAVE><td><a NAME="scopelist"></a><tt>scopelist</tt></td><td NOSAVE>A pointer to a comma separated list of scope names. <i>Maybe the empty string</i> if you wish to use scopes this machine is configuredfor.. </td></tr><tr VALIGN=TOP NOSAVE><td><a NAME="callback"></a><tt>callback</tt></td><td NOSAVE>The address of an <a href="SLPAttrCallback.html">SLPAttrCallback</a>function that will be called to report the results of the operation. May not be NULL. See <a href="Callbacks.html">Callbacks</a> for more informationon how callbacks are used by the SLPAPI.</td></tr><tr VALIGN=TOP NOSAVE><td NOSAVE><a NAME="cookie"></a><tt>cookie</tt></td><td NOSAVE>Pointer to memory that gets passed to the callback code. May be NULL.</td></tr></table><h3>Returns</h3><table BORDER NOSAVE ><tr NOSAVE><td NOSAVE>SLP_OK</td><td>Indicates that the no error occurred during the operation.</td></tr><tr><td>SLP_PARSE_ERROR</td><td>The SLP message was rejected by a remote SLP agent. The API returnsthis error only when no information was retrieved, and at least one SAor DA indicated a protocol error. The data supplied through the API maybe malformed or a may have been damaged in transit.</td></tr><tr><td>SLP_AUTHENTICATION_ABSENT</td><td>If the SLP framework supports authentication, this error arises whenthe UA or SA failed to send an authenticator for requests or registrations.</td></tr><tr><td>SLP_AUTHENTICATION_FAILED</td><td>If the SLP framework supports authentication, this error arises whena authentication on an SLP message failed.</td></tr><tr><td>SLP_NETWORK_TIMED_OUT</td><td>When no reply can be obtained in the time specified by the configuredtimeout interval for a unicast request, this error is returned. Inother words, slpd is running, but something is wrong with it</td></tr><tr><td>SLP_NETWORK_INIT_FAILED</td><td>If the network cannot initialize properly, this error is returned.Will also be returned if an SA or DA agent (slpd) can not be contacted. slpd must be running in order to call SLPReg() or SLPDereg().</td></tr><tr><td>SLP_MEMORY_ALLOC_FAILED </td><td>Out of memory error</td></tr><tr><td>SLP_PARAMETER_BAD</td><td>If a parameter passed into a function is bad, this error is returned.</td></tr><tr><td>SLP_NETWORK_ERROR</td><td>The failure of networking during normal operations causes this errorto be returned. In OpenSLP, this is the error you'll get if an underlyingsocket() call failed.</td></tr><tr><td>SLP_INTERNAL_SYSTEM_ERROR</td><td>A basic failure of the API causes this error to be returned. This occurswhen a system call or library fails. The operation could not recover.</td></tr><tr><td>SLP_HANDLE_IN_USE</td><td>Callback functions are not permitted to recursively call into the APIon the same SLPHandle, either directly or indirectly. If an attempt ismade to do so, this error is returned from the called API function.</td></tr></table><p>If no service types can be found, no error is returned. However,no calls (other than the SLP_LAST_CALL) will be made to the SLPSrvTypesCallback. Be aware, especially if the call is async, of error codes that may be passedto the <tt>SLPAttrCallback</tt> callback function.<br> <h3>Status</h3><table CELLPADDING=5 NOSAVE ><tr VALIGN=TOP NOSAVE><td NOSAVE>OpenSLP 0.9.1</td><td NOSAVE>Fully implemented as specified by RFC2614 except for findingattributes by service type or with attrids containing wildcards. These behaviors are expected to be depreciated in the next RFC 2614 revision.</td></tr></table><h3>See Also</h3><a href="SLPSrvTypeCallback.html">SLPSrvTypeCallback</a>, <a href="Syntax.html">Syntax</a>,<a href="Callbacks.html">Callbacks</a><br> <h3>Example Code</h3><blockquote><tt>SLPBoolean myAttrCallback(SLPHandle hslp,</tt><br><tt> const char* attrlist,</tt><br><tt> SLPError errcode,</tt><br><tt> void* cookie )</tt><br><tt>{</tt><br><tt> if(errcode == SLP_OK)</tt><br><tt> {</tt><br><tt> printf("%s\n",attrlist);</tt><br><tt> }</tt><p><tt> return SLP_FALSE;</tt><br><tt>}</tt><br> <p><tt>int main(int argc, char* argv[])</tt><br><tt>{</tt><br><tt> SLPError result;</tt><br><tt> SLPHandle hslp;</tt><p><tt> if(SLPOpen("en",SLP_FALSE,&hslp) == SLP_OK)</tt><br><tt> {</tt><p><tt> result = SLPFindAttrs(hslp,</tt><br><tt> "service:myservice.x://myhost.mydomain.org"</tt><br><tt> "", /* return all attributes */</tt><br><tt> "", /* use configured scopes */</tt><br><tt> myAttrCallback,</tt><br><tt> NULL);</tt><br><tt> if(result != SLP_OK)</tt><br><tt> {</tt><br><tt> printf("errorcode: %i\n",result);</tt><br><tt> }</tt><p><tt> result = SLPFindAttrs(hslp,</tt><br><tt> "service:myservice.x://myhost.mydomain.org"</tt><br><tt> "attr1,attr2", /* return attr1 and attr1 only */</tt><br><tt> "", /* use configured scopes */</tt><br><tt> myAttrCallback,</tt><br><tt> NULL);</tt><br><tt> if(result != SLP_OK)</tt><br><tt> {</tt><br><tt> printf("errorcode: %i\n",result);</tt><br><tt> }</tt><p><tt> SLPClose(hslp);</tt><br><tt> }</tt><br><tt>}</tt></blockquote></body></html>⌨️ 快捷键说明
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