FwpmCalloutUnsubscribeChanges0 function

The FwpmCalloutUnsubscribeChanges0 function is used to cancel a callout change subscription and stop receiving change notifications.

Syntax

DWORD FwpmCalloutUnsubscribeChanges0(
  HANDLE engineHandle,
  HANDLE changeHandle
);

Parameters

engineHandle

Type: HANDLE

Handle for an open session to the filter engine. Call FwpmEngineOpen0 to open a session to the filter engine.

changeHandle

Type: HANDLE

Handle of the subscribed change notification. This is the handle returned by the call to FwpmCalloutSubscribeChanges0.

Return Value

Type: DWORD

Return code/value Description
ERROR_SUCCESS
0
The subscription was deleted successfully.
FWP_E_* error code
0x80320001—0x80320039
A Windows Filtering Platform (WFP) specific error. See WFP Error Codes for details.
RPC_* error code
0x80010001—0x80010122
Failure to communicate with the remote or local firewall engine.

Remarks

If the callback is currently being invoked, this function will not return until the callback completes. Thus, when calling this function, you must not hold any locks that the callback may also try to acquire lest you deadlock.

It is not necessary to unsubscribe before closing a session; all subscriptions are automatically canceled when the subscribing session terminates.

This function cannot be called from within a transaction. It will fail with FWP_E_TXN_IN_PROGRESS. See Object Management for more information about transactions.

FwpmCalloutUnsubscribeChanges0 is a specific implementation of FwpmCalloutUnsubscribeChanges. See WFP Version-Independent Names and Targeting Specific Versions of Windows for more information.

Requirements

   
Minimum supported client Windows Vista [desktop apps only]
Minimum supported server Windows Server 2008 [desktop apps only]
Target Platform Windows
Header fwpmu.h
Library Fwpuclnt.lib
DLL Fwpuclnt.dll

See Also

FwpmCalloutSubscribeChanges0