FwpmCalloutSubscribeChanges0 function (fwpmu.h)
The FwpmCalloutSubscribeChanges0 function is used to request the delivery of notifications regarding changes in a particular callout.
Syntax
DWORD FwpmCalloutSubscribeChanges0(
[in] HANDLE engineHandle,
[in] const FWPM_CALLOUT_SUBSCRIPTION0 *subscription,
[in] FWPM_CALLOUT_CHANGE_CALLBACK0 callback,
[in, optional] void *context,
[out] HANDLE *changeHandle
);
Parameters
[in] engineHandle
Type: HANDLE
Handle for an open session to the filter engine. Call FwpmEngineOpen0 to open a session to the filter engine.
[in] subscription
Type: FWPM_CALLOUT_SUBSCRIPTION0*
The notifications which will be delivered.
[in] callback
Type: FWPM_CALLOUT_CHANGE_CALLBACK0
Function pointer that will be invoked when a notification is ready for delivery.
[in, optional] context
Type: void*
Optional context pointer. This pointer is passed to the callback function along with details of the change.
[out] changeHandle
Type: HANDLE*
Handle to the newly created subscription.
Return value
Type: DWORD
| Return code/value | Description |
|---|---|
|
The subscription was created successfully. |
|
A Windows Filtering Platform (WFP) specific error. See WFP Error Codes for details. |
|
Failure to communicate with the remote or local firewall engine. |
Remarks
Subscribers do not receive notifications for changes made with the same session handle used to subscribe. This is because subscribers only need to see changes made by others since they already know which changes they made themselves.
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.
The caller needs FWPM_ACTRL_SUBSCRIBE access to the callout's container and FWPM_ACTRL_READ access to the callout. The subscriber will only get notifications for callouts to which it has FWPM_ACTRL_READ access. See Access Control for more information.
FwpmCalloutSubscribeChanges0 is a specific implementation of FwpmCalloutSubscribeChanges. See WFP Version-Independent Names and Targeting Specific Versions of Windows for more information.
Requirements
| Requirement | Value |
|---|---|
| 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 |