FwpmBfeStateUnsubscribeChanges0 function (fwpmk.h)
The FwpmBfeStateUnsubscribeChanges0 function deregisters a base filtering engine (BFE) callback function that was previously registered by calling the FwpmBfeStateSubscribeChanges0 function.
Warning
Do not call FwpmBfeStateUnsubscribeChanges0 from a callback function that your driver previously registered by calling FwpmBfeStateSubscribeChanges0. Doing so can cause a deadlock.
Syntax
NTSTATUS FwpmBfeStateUnsubscribeChanges0(
[in, out] HANDLE changeHandle
);
Parameters
[in, out] changeHandle
A handle associated with the registration of the callback function that is being deregistered. This handle was returned to the callout driver when it called the FwpmBfeStateSubscribeChanges0 function to register the callback function.
Return value
The FwpmBfeStateUnsubscribeChanges0 function returns one of the following NTSTATUS codes:
| Return code | Description |
|---|---|
| STATUS_SUCCESS | The callback function was successfully deregistered. |
| Other NTSTATUS codes | An error occurred. |
Remarks
A callout driver calls the FwpmBfeStateUnsubscribeChanges0 function to deregister a callback function that was previously registered by calling the FwpmBfeStateSubscribeChanges0 function.
If a callout driver registers a callback function by calling the FwpmBfeStateSubscribeChanges0 function, it must deregister the callback function before the callout driver can be unloaded.
FwpmBfeStateUnsubscribeChanges0 is a specific version of FwpmBfeStateUnsubscribeChanges. See WFP Version-Independent Names and Targeting Specific Versions of Windows for more information.
Requirements
| Requirement | Value |
|---|---|
| Minimum supported client | Available starting with Windows Vista. |
| Target Platform | Universal |
| Header | fwpmk.h (include Fwpmk.h) |
| Library | Fwpkclnt.lib |
| IRQL | PASSIVE_LEVEL |