<div class="content" name="R_DhcpModifyClassV6" uuid="81a007ee-8620-4000-bf9c-cbc16fbad84d"><p>The <b>R_DhcpModifyClassV6</b> method modifies the user
class or vendor class definition for the DHCPv6 server.</p><dl>
<dd>
<div><pre> DWORD R_DhcpModifyClassV6(
   [in, unique, string] DHCP_SRV_HANDLE ServerIpAddress,
   [in] DWORD ReservedMustBeZero,
   [in] LPDHCP_CLASS_INFO_V6 ClassInfo
 );
</pre></div>
</dd></dl><p><b>ServerIpAddress: </b>The IP address/host name of
the DHCP server. This parameter is unused.</p><p><b>ReservedMustBeZero: </b>This flag SHOULD be set to
0. Currently it is not used, and any value set to this parameter will not
affect the behavior of this method.</p><p><b>ClassInfo: </b>This is of type <a href="c820453d-a53c-4e36-99dd-caf5aa55909a" data-linktype="relative-path">DHCP_CLASS_INFO_V6 (section 2.2.1.2.70)</a>,
containing information regarding a user class or a vendor class.</p><p><b>Return Values: </b>A 32-bit unsigned integer value
that indicates return status. A return value ERROR_SUCCESS (0x00000000)
indicates that the operation was completed successfully, else it contains a
Win32 error code, as specified in <a href="../ms-erref/1bc92ddf-b79e-413c-bbaa-99a5281a6c90" data-linktype="relative-path">[MS-ERREF]</a>.
This error code value can correspond to a DHCP-specific failure, which takes a
value between 20000 and 20099, or any generic failure. </p><dl>
<dd>
<table><thead>
  <tr>
   <th>
   <p>Return value/code</p>
   </th>
   <th>
   <p>Description</p>
   </th>
  </tr>
 </thead><tbody><tr>
  <td>0x00000000 ERROR_SUCCESS</td>
  <td>The call was successful.</td>
 </tr><tr>
  <td>0x00004E2D ERROR_DHCP_JET_ERROR</td>
  <td>An error occurred while accessing the DHCP server database.</td>
 </tr></tbody></table>
</dd></dl><p>The opnum field value for this method is 75.</p><p>When processing this call, the DHCP server MUST do the
following:</p><ul><li><p><span><span> 
</span></span>Validate if this method is authorized for read/write access per
section <a href="38840bd0-0a5a-47ed-bc69-0dd870d33aec" data-linktype="relative-path">3.5.5</a>. If not,
return the error ERROR_ACCESS_DENIED.</p>
</li><li><p><span><span> 
</span></span>If <b>ClassInfo</b> is NULL, return ERROR_INVALID_PARAMETER.</p>
</li><li><p><span><span> 
</span></span>If <b>ClassName</b> is NULL, or if <b>ClassDataLength</b> is 0
and <b>ClassData</b> is not NULL, return ERROR_INVALID_PARAMETER.</p>
</li><li><p><span><span> 
</span></span>Retrieve the <b>DHCPv6ClassDefList</b> object. If the <b>DHCPv6ClassDef</b>
object indicated by <b>ClassInfo</b> is not in <b>DHCPv6ClassDefList</b>,
return ERROR_FILE_NOT_FOUND.</p>
</li><li><p><span><span> 
</span></span>Modify the <b>DHCPv6ClassDef</b> object found with the
information in <b>ClassInfo</b>.</p>
</li></ul><p><b>Exceptions Thrown:</b> No exceptions are thrown beyond
those thrown by the underlying RPC protocol <a href="../ms-rpce/290c38b1-92fe-4229-91e6-4fc376610c15" data-linktype="relative-path">[MS-RPCE]</a>.</p></div>