<div class="content"><p> </p><p>The <b>R_DhcpRemoveOptionV5</b> method removes the option
definition of a specific option for a specific user class and vendor class at
the default option level. If the user class or the vendor class is not
specified, the option definition is removed from the default user class or
vendor class. The <i>OptionID</i> specifies the identifier of the option
definition.</p><dl>
<dd>
<div><pre> DWORD R_DhcpRemoveOptionV5(
   [in, unique, string] DHCP_SRV_HANDLE ServerIpAddress,
   [in] DWORD Flags,
   [in] DHCP_OPTION_ID OptionID,
   [in, string, unique] WCHAR* ClassName,
   [in, string, unique] WCHAR* VendorName
 );
</pre></div>
</dd></dl><p><b>ServerIpAddress: </b>The IP address/host name of
the DHCP server. This parameter is unused.</p><p><b>Flags: </b>This is of type <span><a href="../ms-dtyp/262627d8-3418-4627-9218-4ffe110850b2" data-linktype="relative-path">DWORD</a></span>
that specifies that the option definition is removed for a specific or default
vendor class.</p><dl>
<dd>
<table><thead>
  <tr>
   <th>
   <p>Value</p>
   </th>
   <th>
   <p>Meaning</p>
   </th>
  </tr>
 </thead><tbody><tr>
  <td>
  <p>DHCP_FLAGS_OPTION_DEFAULT</p>
  <p>0x00000000</p>
  </td>
  <td>
  <p>Option definition is removed for the default vendor
  class.</p>
  </td>
 </tr><tr>
  <td>
  <p>DHCP_FLAGS_OPTION_IS_VENDOR</p>
  <p>0x00000003</p>
  </td>
  <td>
  <p>If a bitwise AND operation with this bitmask yields a
  nonzero value, it indicates that the option definition is removed for a
  specific vendor class.</p>
  </td>
 </tr></tbody></table>
</dd></dl><p><b>OptionID: </b>This is of type <span><a href="4a0bb785-ceec-4f7a-b4a7-64555f6e0b62" data-linktype="relative-path">DHCP_OPTION_ID (section 2.2.1.2.3)</a></span>,
containing the option identifier for the option definition being removed.</p><p><b>ClassName: </b>A pointer to a null-terminated
Unicode string that contains the name of the user class for which the option
definition is removed. This parameter is optional. If the <i>ClassName</i>
parameter is not specified, the option definition is removed for the default
user class.</p><p><b>VendorName: </b>A pointer to a null-terminated
Unicode string that contains the name of the vendor class for which the option
definition is removed. This parameter is optional. If vendor class name is not
specified, the option definition is removed for the default 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 <span><a href="../ms-erref/1bc92ddf-b79e-413c-bbaa-99a5281a6c90" data-linktype="relative-path">[MS-ERREF]</a></span>.
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>
  <p>0x00000000</p>
  <p>ERROR_SUCCESS</p>
  </td>
  <td>
  <p>The call was successful.</p>
  </td>
 </tr><tr>
  <td>
  <p>0x00004E2A</p>
  <p>ERROR_DHCP_OPTION_NOT_PRESENT</p>
  </td>
  <td>
  <p>The specified option definition does not exist on the
  DHCP server database.</p>
  </td>
 </tr><tr>
  <td>
  <p>0x00004E4C</p>
  <p>ERROR_DHCP_CLASS_NOT_FOUND</p>
  </td>
  <td>
  <p>The class name being used is unknown or incorrect.</p>
  </td>
 </tr></tbody></table>
</dd></dl><p>The opnum field value for this method is 18.</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 <span><a href="38840bd0-0a5a-47ed-bc69-0dd870d33aec" data-linktype="relative-path">3.5.5</a></span>. If not,
return the error ERROR_ACCESS_DENIED.</p>
</li><li><p><span><span> 
</span></span>The <i>Flags</i> parameter MUST pass one of the validations given
in the <i>Flags</i> field description. Otherwise, the method returns
ERROR_INVALID_PARAMETER.</p>
</li><li><p><span><span> 
</span></span>Iterate through the server ADM element <b>DHCPv4OptionDefList</b>
and retrieve <b>DHCPv4OptionDef.DHCPv4ClassedOptDefList</b> corresponding to
the user and vendor class specified by <i>ClassName</i> and <i>VendorName</i>
respectively. If <i>ClassName</i> or <i>VendorName</i> is NULL, it refers to
the default user class or vendor class respectively, as specified in section <span><a href="4aa40625-0f9f-4e89-93a4-e4455bc1cc95" data-linktype="relative-path">3.1.1.9</a></span>.
If there is no <b>DHCPv4OptionDef</b> entry corresponding to the specified user
and vendor classes, return ERROR_DHCP_CLASS_NOT_FOUND.</p>
</li><li><p><span><span> 
</span></span>Iterate through <b>DHCPv4ClassedOptDefList</b> and if there is no
<b>DHCPv4ClassedOptDef</b> entry corresponding to the <i>OptionID</i>, return
the error ERROR_DHCP_OPTION_NOT_PRESENT.</p>
</li><li><p><span><span> 
</span></span>Delete the <b>DHCPv4ClassedOptDef</b> entry corresponding to the <i>OptionID</i>
from the <b>DHCPv4ClassedOptDefList</b>, and return ERROR_SUCCESS.</p>
</li></ul><p><b>Exceptions Thrown:</b> No exceptions are thrown beyond
those thrown by the underlying RPC protocol <span><a href="../ms-rpce/290c38b1-92fe-4229-91e6-4fc376610c15" data-linktype="relative-path">[MS-RPCE]</a></span>.</p></div>