FwpmCalloutDeleteByKey0 function (fwpmu.h)

The FwpmCalloutDeleteByKey0 function removes a callout object from the system.


DWORD FwpmCalloutDeleteByKey0(
  [in] HANDLE     engineHandle,
  [in] const GUID *key


[in] engineHandle


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

[in] key

Type: const GUID*

Unique identifier of the callout being removed from the system. This GUID was specified in the calloutKey member of the callout parameter when the application called FwpmCalloutAdd0 for this object.

Return value


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


An applications's callouts cannot be removed from the system as long as there are filters in the system that specify the callouts for an action.

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

This function can be called within a dynamic session if the corresponding object was added during the same session. If this function is called for an object that was added during a different dynamic session, it will fail with FWP_E_WRONG_SESSION. If this function is called for an object that was not added during a dynamic session, it will fail with FWP_E_DYNAMIC_SESSION_IN_PROGRESS.

The caller needs DELETE access to the callout. See Access Control for more information.

FwpmCalloutDeleteByKey0 is a specific implementation of FwpmCalloutDeleteByKey. See WFP Version-Independent Names and Targeting Specific Versions of Windows for more information.


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

See also


Kernel-Mode FwpmCalloutDeleteByKey0