<div class="content"><p> </p><p>The BaseRegCloseKey method is called by the client. In
response, the server destroys (closes) the handle to the specified registry
key.</p><dl>
<dd>
<div><pre> error_status_t BaseRegCloseKey(
   [in, out] PRPC_HKEY hKey
 );
</pre></div>
</dd></dl><p><b>hKey: </b>A handle to a key that MUST have been
opened previously by using one of the open methods that are specified in
section <span><a href="053e8515-dbae-47ea-a7c6-6dc054e3a48f" data-linktype="relative-path">3.1.5</a></span>: <span><a href="956a3052-6580-43ee-91aa-aaf61726149b" data-linktype="relative-path">OpenClassesRoot</a></span>,
<span><a href="ec140ed9-4d00-4c03-a15c-c7245a497ed5" data-linktype="relative-path">OpenCurrentUser</a></span>,
<span><a href="6cef29ae-21ba-423f-9158-05145ac80a5b" data-linktype="relative-path">OpenLocalMachine</a></span>,
<span><a href="7b514c63-6cad-4fe1-9780-743959e377e6" data-linktype="relative-path">OpenPerformanceData</a></span>,
<span><a href="694e57f4-da3e-4285-8b71-3181d71d6cd1" data-linktype="relative-path">OpenUsers</a></span>,
<span><a href="c7186ae2-1c82-45e9-933b-97d9873657e8" data-linktype="relative-path">BaseRegCreateKey</a></span>,
<span><a href="8cb48f55-19e1-4ea2-8d76-dd0f6934f0d9" data-linktype="relative-path">BaseRegOpenKey</a></span>,
<span><a href="160767d7-83cf-4718-a4f3-d864faee3bb1" data-linktype="relative-path">OpenCurrentConfig</a></span>,
<span><a href="44954f6d-ef2c-4ec1-a27d-32b9b87e3c8a" data-linktype="relative-path">OpenPerformanceText</a></span>,
<span><a href="3626fa8a-b20f-4243-bf85-cdb615ed2ca0" data-linktype="relative-path">OpenPerformanceNlsText</a></span>.</p><p><b>Return Values: </b>The method returns 0
(ERROR_SUCCESS) to indicate success; otherwise, it returns a nonzero error
code, as specified in <span><a href="../ms-erref/1bc92ddf-b79e-413c-bbaa-99a5281a6c90" data-linktype="relative-path">[MS-ERREF]</a></span>
section <span><a href="../ms-erref/18d8fbe8-a967-4f1c-ae50-99ca8e491d2d" data-linktype="relative-path">2.2</a></span>.
The most common error codes are listed in the following table.</p><dl>
<dd>
<table><thead>
  <tr>
   <th>
   <p>Return value/code</p>
   </th>
   <th>
   <p>Description</p>
   </th>
  </tr>
 </thead><tbody><tr>
  <td>
  <p>0x00000006</p>
  <p>ERROR_INVALID_HANDLE</p>
  </td>
  <td>
  <p>The handle is invalid.</p>
  </td>
 </tr><tr>
  <td>
  <p>0x000000AA</p>
  <p>ERROR_BUSY</p>
  </td>
  <td>
  <p>The requested resource is in use.</p>
  </td>
 </tr><tr>
  <td>
  <p>0x00000013</p>
  <p>ERROR_WRITE_PROTECT</p>
  </td>
  <td>
  <p>A read or write operation was attempted to a volume
  after it was dismounted. The server can no longer service registry requests
  because server shutdown has been initiated.</p>
  </td>
 </tr><tr>
  <td>
  <p>0x00000015</p>
  <p>ERROR_NOT_READY</p>
  </td>
  <td>
  <p>The service is not read. Calls can be repeated at a
  later time.</p>
  </td>
 </tr><tr>
  <td>
  <p>0x00000102</p>
  <p>WAIT_TIMEOUT</p>
  </td>
  <td>
  <p>The wait operation timed out.</p>
  </td>
 </tr></tbody></table>
</dd></dl><p>Server Operations</p><p>If the registry server can no longer service registry
requests because server shutdown has been initiated, the server MUST return
ERROR_WRITE_PROTECT.</p><p>If the handle provided in the <i>hKey</i> parameter is not a
valid open handle to a registry key, the server MUST fail the method and return
ERROR_INVALID_HANDLE. If the operation was unsuccessful, the server MUST NOT
change the value of the <i>hKey</i> parameter and return the original value to
the client.</p><p>If the registry server cannot obtain a lock on a registry
request, the server MUST return ERROR_BUSY. The operation SHOULD be repeated.</p><p>The server MUST determine if the UPDATECOPY column of the
entry for <i>hKey</i> in the HANDLETABLE is set to <b>true</b>. If UPDATECOPY
is set to <b>true</b>, the server MUST copy all subkeys and values of the key
indicated by the <i>hKey</i> parameter from the 32-bit key namespace into the
64-bit key namespace or from the 64-bit key namespace into the 32-bit key
namespace. Any values already in the target namespace are overwritten as part
of the copy operation. Any errors encountered during the copy operation are not
returned to the client, and the result of the copy operation is undefined.</p><p>In response to this request from the client, for a
successful operation, the server MUST return 0 to indicate success and close
the handle to the key that is specified by the <i>hKey</i> parameter in the
client request. The server MUST also set the value of the <i>hKey</i> parameter
to NULL. The server MUST also remove the entry for <i>hKey</i> in the
HANDLETABLE.</p><p>The implementation of the handle close operation is
server-specific. However, functionally, after a handle is closed, the server
MUST not allow the handle to refer to a given registry key until a new handle
is created and opened for that key using one of the open methods that are
specified in section 3.1.5: OpenClassesRoot, OpenCurrentUser, OpenLocalMachine,
OpenPerformanceData, OpenUsers, BaseRegCreateKey, BaseRegOpenKey,
OpenCurrentConfig, OpenPerformanceText, OpenPerformanceNlsText.</p><p>If the method is unsuccessful, the server MUST return a
nonzero error code, as specified in [MS-ERREF] section 2.2.</p><p>The server MUST return ERROR_BUSY if an internal lock cannot
be obtained. This would happen under very high contention rates or if the
client is corrupted. The operation SHOULD be repeated.</p><p>The server returns WAIT_TIMEOUT if the server load is high
and it is unable to acquire locks on the registry database.</p></div>