📄 slpfindsrvs.html
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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 - SLPFindSrvs()</title></head><body text="#000000" bgcolor="#FFFFFF" link="#0000EF" vlink="#51188E" alink="#FF0000"><h2>SLPFindSrvs</h2><hr WIDTH="100%"><h3>Declaration</h3><tt>#include <slp.h></tt><p><tt><a href="SLPError.html">SLPError</a> SLPFindSrvs( <a href="SLPTypes.html#SLPHandle">SLPHandle</a><a href="#hslp">hslp</a>,</tt><br><tt> const char* <a href="#srvtype">srvtype</a>,</tt><br><tt> const char* <a href="#scopelist">scopelist</a>,</tt><br><tt> const char* <a href="#filter">filter</a>,</tt><br><tt> <a href="SLPSrvURLCallback.html">SLPSrvURLCallback</a> callback,</tt><br><tt> void* <a href="#cookie">cookie</a>)</tt><h3>Description</h3>Issue a query for services.<br> <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 registerthe service.</td></tr><tr VALIGN=TOP NOSAVE><td><a NAME="srvtype"></a><tt>srvtype</tt></td><td NOSAVE>The service type string, including the authority string (ifany) for the request. May not be the empty string, "". May not beNULL. See <a href="Syntax.html">Syntax</a> more information on ServiceType syntax. </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 NOSAVE><a NAME="filter"></a><tt>filter</tt></td><td>A query formulated of attribute pattern matching expressions in theform of an LDAPv3 search filter. Pass in the empty string,"" for all services of the requested type. See <a href="Syntax.html">Syntax</a>for more information on LDAP3 search filter syntax.</td></tr><tr VALIGN=TOP NOSAVE><td><a NAME="callback"></a><tt>callback</tt></td><td NOSAVE>The address of an <a href="SLPSrvURLCallback.html">SLPSrvURLCallback</a>function that will be called to report the results of the query. 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 services can be found, no error is returned. However, nocalls (other than the SLP_LAST_CALL) will be made to the SLPSrvURLCallback. Be aware, especially if the call is async, of error codes that may be passedto the <tt>SLPSrvURLCallback</tt> callback function.<br> <h3>Status</h3><table CELLPADDING=5 NOSAVE ><tr VALIGN=TOP NOSAVE><td NOSAVE>OpenSLP 0.9.1</td><td NOSAVE>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><br> <h3>Example Code</h3><blockquote><tt>#include <slp.h></tt><p><tt>SLPBoolean MySLPSrvURLCallback( SLPHandle hslp,</tt><br><tt> const char* srvurl,</tt><br><tt> unsigned short lifetime,</tt><br><tt> SLPError errcode,</tt><br><tt> void* cookie )</tt><br><tt>{</tt><br><tt> if(errcode == SLP_OK || errcode == SLP_LAST_CALL)</tt><br><tt> {</tt><br><tt> printf("Service URL = %s\n",srvurl);</tt><br><tt> printf("Service Timeout= %i\n",lifetime);</tt><br><tt> *(SLPError*)cookie =SLP_OK;</tt><br><tt> }</tt><br><tt> else</tt><br><tt> {</tt><br><tt> *(SLPError*)cookie =errcode;</tt><br><tt> }</tt><p><tt> /* return SLP_TRUE because we want to be calledagain */</tt><br><tt> /* if more services were found */</tt><p><tt> return SLP_TRUE;</tt><br><tt>}</tt><p><tt>int main( int argc, char* argv[])</tt><br><tt>{</tt><br><tt> SLPError err;</tt><br><tt> SLPError callbackerr;</tt><br><tt> SLPHandle hslp;</tt><p><tt> err = SLPOpen("en",SLP_FALSE,&hslp);</tt><br><tt> if(err != SLP_OK)</tt><br><tt> {</tt><br><tt> printf("Error openingslp handle %i\n",err);</tt><br><tt> return err;</tt><br><tt> }</tt><br> <p><tt> err = SLPFindSrvs( hslp,</tt><br><tt> "myservice.myorg",</tt><br><tt> 0, /* use configured scopes */</tt><br><tt> 0, /* no attr filter */</tt><br><tt> MySLPSrvURLCallback,</tt><br><tt> &callbackerr );</tt><p><tt> /* err may contain an error code that occurredas the slp library */</tt><br><tt> /* _prepared_ to make the call. */</tt><br><tt> if((err != SLP_OK) || (callbackerr != SLP_OK))</tt><br><tt> {</tt><br><tt> printf("Error registeringservice with slp %i\n",err);</tt><br><tt> return err;</tt><br><tt> }</tt><p><tt> /* callbackerr may contain an error code (thatwas assigned through */</tt><br><tt> /* the callback cookie) that occurred as slppackets were sent on */</tt><br><tt> /* the wire */</tt><br><tt> if( callbackerr != SLP_OK)</tt><br><tt> {</tt><br><tt> printf("Error registeringservice with slp %i\n",callbackerr);</tt><br><tt> return callbackerr;</tt><br><tt> }</tt><p><tt> /* Now that we're done using slp, close the slphandle */</tt><br><tt> SLPClose(hslp);</tt><br> <p><tt> /* rest of program */</tt><br><tt>}</tt></blockquote></body></html>⌨️ 快捷键说明
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