#Pointer focus registration code driver#
#Pointer focus registration code code#

#Pointer focus registration code driver#

However, during a Registrењњallback call to handle a RegNtPreKeyHandleClose or RegNtPostKeyHandleClose notification, a registry filter driver can call a configuration manager routine (for example, CmGetBoundTransaction) that takes a registry object as a parameter. RegNtCallbackObjectContextCleanup ( REG_CALLBACK_CONTEXT_CLEANUP_INFORMATION structure)Д«ecause the Object member points to a key object that is not in a valid state, the registry filtering driver must not pass the Object pointer value as a parameter to a Windows driver support routine (for example, ObReferenceObjectByPointer). RegNtPostKeyHandleClose ( REG_POST_OPERATION_INFORMATION structure) RegNtPreKeyHandleClose ( REG_KEY_HANDLE_CLOSE_INFORMATION structure) If the second parameter in a registry callback is one of the following REG_NOTIFY_CLASS enumeration values, the Object member of the registry callback notification structure points to a key object that is being destroyed and whose reference count is zero:

#Pointer focus registration code code#

Any other Status value, including a nonzero status code for which the NT_SUCCESS macro evaluates to TRUE, indicates that the value of the Object member is undefined. The Object member of this structure is valid only if the Status member of the structure is set to STATUS_SUCCESS. If the second parameter in a call to the Registrењњallback routine of a registry filtering driver is a REG_NOTIFY_CLASS enumeration value of RegNtPostCreateKeyEx or RegNtPostOpenKeyEx, the third parameter is a pointer to a REG_POST_OPERATION_INFORMATION structure. In some cases, the Object member can contain a value that is non- NULL, but is not a pointer to a valid key object. Many of the notification structure types contain an Object member that points to a key object. The type of this structure varies according to the registry operation that is being performed. The notification structure contains information about the registry operation. This value indicates which type of registry callback notification structure the third parameter of the Registrењњallback routine points to.

In a registry filtering driver, the second parameter of the Registrењњallback routine is a REG_NOTIFY_CLASS enumeration value.

This topic lists the circumstances in which the Object member of a registry callback notification structure might contain an undefined, non- NULL value. The property change listener is notified of every change involving the focus, including changes to the focus owner, the focused window, and the default focus traversal policy. To avoid fatal errors and possible memory corruption, a registry filtering driver must not try to access a key object by using an invalid object pointer. If a focus listener is not appropriate, you can instead register a PropertењњhangeListener on the KeyboardFocusManager. Invalid Key Object Pointers in Registry Notifications