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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 - SLPReg()</title></head><body text="#000000" bgcolor="#FFFFFF" link="#0000EF" vlink="#51188E" alink="#FF0000"><h2>SLPReg</h2><hr WIDTH="100%"><h3>Declaration</h3><tt>#include <slp.h></tt><p><tt><a href="SLPError.html">SLPError</a> SLPReg( <a href="SLPTypes.html#SLPHandle">SLPHandle</a><a href="#hslp">hslp</a>,</tt><br><tt> const char* <a href="#srvurl">srvurl</a>,</tt><br><tt> unsigned short <a href="#lifetime">lifetime</a>,</tt><br><tt> const char* <a href="#srvtype">srvtype</a>,</tt><br><tt> const char* <a href="#attrs">attrs</a>,</tt><br><tt> <a href="SLPTypes.html#SLPBoolean">SLPBoolean</a> <a href="#fresh">fresh</a>,</tt><br><tt> <a href="SLPRegReport.html">SLPRegReport</a> <a href="#callback">callback</a>,</tt><br><tt> void* <a href="#cookie">cookie </a>)</tt><h3>Description</h3>Registers the URL in <tt>srvurl</tt> having the lifetime <tt>lifetime</tt>with the attribute list in <tt>attrs</tt>. The <tt>attrs</tt> list is acomma separated list of attribute assignments in the wire format (includingescaping of reserved characters). The <tt>lifetime</tt> parameter mustbe nonzero and less than or equal to <tt><a href="SLPTypes.html#SLPURLLifetime">SLP_LIFETIME_MAXIMUM</a></tt>.If the <tt>fresh</tt> flag is <tt>SLP_TRUE</tt>, then the registrationis new (the SLP protocol FRESH flag is set) and the registration replacesany existing registrations. The <tt>srvtype</tt> parameter is a servicetype name and can be included for service URLs that are not in the service:scheme. If the URL is in the service: scheme, the <tt>srvtype</tt> parameteris ignored. If the fresh flag is <tt>SLP</tt>_FALSE, then an existing registrationis updated. Registrations and updates take place in the language localeof the <tt>hslp</tt> handle.<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="srvurl"></a><tt>srvurl</tt></td><td NOSAVE>The service URL to register. May not be the empty string. May not be NULL. Must conform to SLP Service URL syntax. <tt><a href="SLPError.html#INVALID_REGISTRATION">SLP_INVALID_REGISTRATION</a></tt>will be returned if srvurl is not a SLP Service URL. See <a href="Syntax.html">Syntax</a>for more information on Service URL syntax.</td></tr><tr VALIGN=TOP NOSAVE><td NOSAVE><a NAME="lifetime"></a><tt>lifetime</tt></td><td NOSAVE>An unsigned short giving the lifetime of the service in seconds. The value must be an unsigned integer less than or equal to <tt><a href="SLPTypes.html#SLPURLLifetime">SLP_LIFETIME_MAXIMUM</a></tt>and greater than zero. <i>If lifetime is set to <tt><a href="SLPTypes.html#SLPURLLifetime">SLP_LIFETIME_MAXIMUM</a></tt>,it will remain registered for the life of the calling process.</i></td></tr><tr VALIGN=TOP NOSAVE><td><a NAME="srvtype"></a>srvtype</td><td NOSAVE>This parameter is always ignored because the Service URL syntaxrequired for the <tt>srvurl</tt> parameter encapsulates the service-type. See <a href="Syntax.html">Syntax</a> for more information on Service URLsyntax.</td></tr><tr VALIGN=TOP NOSAVE><td NOSAVE><a NAME="attrs"></a>attrs</td><td>A list of attribute assignment expressions for the attributes of theregistered service. Use the empty string, "" for no attributes. Example: "(attr1=val1),(attr2=val2),(attr3=val3)"</td></tr><tr VALIGN=TOP NOSAVE><td><a NAME="fresh"></a><tt>fresh</tt></td><td NOSAVE>An SLPBoolean that is <tt>SLP_TRUE</tt> if the registrationis new or <tt>SLP_FALSE</tt> for a re-registration. Currently, OpenSLPdoes not support incremental registrations. If <tt>fresh</tt> is<tt>SLP_FALSE</tt>,<tt>SLPReg()</tt>will return <tt><a href="SLPError.html#SLP_NOT_IMPLEMENTED">SLP_NOT_IMPLEMENTED</a></tt>.</td></tr><tr VALIGN=TOP NOSAVE><td><a NAME="callback"></a><tt>callback</tt></td><td NOSAVE>The address of an <tt><a href="SLPRegReport.html">SLPRegReport</a></tt>function that will be called to report the operation completion status. Man 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_INVALID_REGISTRATION</td><td>The deregistered service url does not conform to valid service urlsyntax. The service url being deregistered is not registered thismeans that either it was never registered via a call to SLPReg() or thatthe registration lifetime has expired. SLP_INVALID_REGISTRATIONis commonly returned when an attempt is made to deregister a service thatwas registered by a call to SLPReg() on a different host.</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>Be aware, especially if the call is async, of error codes that may bepassed to the SLPRegReport() callback function.<h3>Status</h3><table CELLPADDING=5 NOSAVE ><tr VALIGN=TOP NOSAVE><td NOSAVE>OpenSLP 0.8.0</td><td NOSAVE>Fully implemented as specified by RFC 2614</td></tr></table><h3>See Also</h3><a href="SLPDereg.html">SLPDeReg()</a>, <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>void MySLPRegReport(SLPHandle hslp, SLPError errcode, void* cookie)</tt><br><tt>{</tt><br><tt> /* return the error code in the cookie */</tt><br><tt> *(SLPError*)cookie = errcode;</tt><p><tt> /* You could do something else here like printout */</tt><br><tt> /* the errcode, etc. Remember, as a generalrule, */</tt><br><tt> /* do not try to do too much in a callback because */</tt><br><tt> /* it is being executed by the same thread thatis */</tt><br><tt> /* reading slp packets from the wire. */</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><p><tt> /* Register a service with SLP */</tt><br><tt> err = SLPReg( hslp,</tt><br><tt> "service:myservice.myorg://hostname.domain.com:6672",</tt><br><tt> SLP_LIFETIME_MAXIMUM,</tt><br><tt> 0,</tt><br><tt> "(public_key=......my_pgp_key.......)",</tt><br><tt> SLP_TRUE,</tt><br><tt> MySLPRegReport,</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><p><tt> /* rest of program */</tt><br><tt>}</tt><br><tt></tt> </blockquote></body></html>⌨️ 快捷键说明
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