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<title>OpenSLP Programmers Guide - SLPFindAttrs</title>
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<h2>SLPFindAttrs<br />
<span id="breadcrumbs"><a href="index.html">OpenSLP Programmer's Guide</a> » Service Location Functions » <a href="SLPFindAttrs.html">SLPFindAttrs</a></span></h2>
<h3>Declaration</h3>
<pre>#include <slp.h>
<a href="SLPTypes.html#SLPEXP">SLPEXP</a> <a href="SLPError.html">SLPError</a> <a href="SLPTypes.html#SLPAPI">SLPAPI</a>SLPFindAttrs(
<a href="SLPTypes.html#SLPHandle">SLPHandle</a> <a href="#hslp">hslp</a>,
const char * srvurl,
const char * <a href="#scopelist">scopelist</a>,
const char * attrids,
<a href="SLPAttrCallback.html">SLPAttrCallback</a> <a href="#callback">callback</a>,
void * <a href="#cookie">cookie</a>);
</pre>
<h3>Description</h3>
<p>This function returns service attributes matching the <tt>attrids</tt>
for the indicated Service URL or service type. OpenSLP does
not support location of attributes by service type with <tt>attrids</tt>
containing wildcards (see status below).</p>
<h3>Parameters</h3>
<table nosave="" border="1" cellpadding="5">
<tbody>
<tr nosave="" valign="top">
<td nosave=""><a name="hslp"></a><tt>hslp</tt></td>
<td nosave="">The language specific <tt>SLPHandle</tt> on which to search
for attributes the service.</td>
</tr>
<tr nosave="" valign="top">
<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%20Type">
Syntax</a>
for more information SLP Service URLs.</td>
</tr>
<tr nosave="" valign="top">
<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 nosave="" valign="top">
<td><a name="scopelist"></a><tt>scopelist</tt></td>
<td nosave="">A pointer to a comma separated list of scope names. <i>May
be the empty string</i> if you wish to use scopes this machine is
configured for.. </td>
</tr>
<tr nosave="" valign="top">
<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
information on how callbacks are used by the SLPAPI.</td>
</tr>
<tr nosave="" valign="top">
<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>
</tbody>
</table>
<h3>Returns</h3>
<table nosave="" border="1">
<tbody>
<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 returns
this error only when no information was retrieved, and at least one SA or
DA indicated a protocol error. The data supplied through the API may be
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 when
the 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 when a
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 configured
timeout interval for a unicast request, this error is returned. In other
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 error
to be returned. In OpenSLP, this is the error you'll get if an underlying
socket() 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
occurs when 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 API
on the same SLPHandle, either directly or indirectly. If an attempt is
made to do so, this error is returned from the called API function.</td>
</tr>
</tbody>
</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 passed to
the <tt>SLPAttrCallback</tt> callback function.</p>
<h3>Status</h3>
<table nosave="" cellpadding="5">
<tbody>
<tr nosave="" valign="top">
<td nosave="">OpenSLP 0.9.1</td>
<td nosave="">Fully implemented as specified by RFC2614 except for finding
attributes by service type or with attrids containing wildcards. These
behaviors are expected to be depreciated in the next RFC 2614 revision.</td>
</tr>
</tbody>
</table>
<h3>See Also</h3>
<p><a href="SLPSrvTypeCallback.html">SLPSrvTypeCallback</a>,
<a href="Syntax.html">Syntax</a>,
<a href="Callbacks.html">Callbacks</a></p>
<h3>Example Code</h3>
<pre> #include <slp.h>
SLPBoolean myAttrCallback(
SLPHandle hslp,
const char* attrlist,
SLPError errcode,
void* cookie )
{
if(errcode == SLP_OK)
{
printf("%s\n",attrlist);
}
return SLP_FALSE;
}
int main(int argc, char* argv[])
{
SLPError result;
SLPHandle hslp;
if(SLPOpen("en",SLP_FALSE,&hslp) == SLP_OK)
{
result =
SLPFindAttrs(
hslp,
"service:myservice.x://myhost.mydomain.org"
"", /* return all attributes */
"", /* use configured scopes */
myAttrCallback,
NULL);
if(result != SLP_OK)
{
printf("errorcode: %i\n",result);
}
result =
SLPFindAttrs(
hslp,
"service:myservice.x://myhost.mydomain.org"
"attr1,attr2", /* return attr1 and attr1 only */
"", /* use configured scopes */
myAttrCallback,
NULL);
if(result != SLP_OK)
{
printf("errorcode: %i\n",result);
}
SLPClose(hslp);
}
}
</pre>
<p id="breadcrumbs0">Prepared by: <a href="http://www.calderasystems.com">Caldera Systems Inc</a><br />
Maintained by: <a href="http://www.openslp.org/">openslp.org</a></p>
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