CRegKey::NotifyChangeKeyValue

This method notifies the caller about changes to the attributes or contents of the open registry key.

LONG NotifyChangeKeyValue(
   BOOL bWatchSubtree,
   DWORD dwNotifyFilter,
   HANDLE hEvent,
   BOOL bAsync = TRUE 
) throw( );

Parameters

bWatchSubtree
Specifies a flag that indicates whether to report changes in the specified key and all of its subkeys or only in the specified key. If this parameter is TRUE, the method reports changes in the key and its subkeys. If the parameter is FALSE, the method reports changes only in the key.

dwNotifyFilter
Specifies a set of flags that control which changes should be reported. This parameter can be a combination of the following values:

Value	Meaning
REG_NOTIFY_CHANGE_NAME	Notify the caller if a subkey is added or deleted.
REG_NOTIFY_CHANGE_ATTRIBUTES	Notify the caller of changes to the attributes of the key, such as the security descriptor information.
REG_NOTIFY_CHANGE_LAST_SET	Notify the caller of changes to a value of the key. This can include adding or deleting a value, or changing an existing value.
REG_NOTIFY_CHANGE_SECURITY	Notify the caller of changes to the security descriptor of the key.

hEvent
Handle to an event. If the bAsync parameter is TRUE, the method returns immediately and changes are reported by signaling this event. If bAsync is FALSE, hEvent is ignored.
bAsync
Specifies a flag that indicates how the method reports changes. If this parameter is TRUE, the method returns immediately and reports changes by signaling the specified event. When this parameter is FALSE, the method does not return until a change has occurred. If hEvent does not specify a valid event, the bAsync parameter cannot be TRUE.

If the method succeeds, the return value is ERROR_SUCCESS. If the method fails, the return value is a nonzero error code defined in WINERROR.H.

Note

This method does not notify the caller if the specified key is deleted.

For more details and a sample program, see RegNotifyChangeKeyValue.

Header: atlbase.h