NTSTATUS FltpOpenFilterServicesKey(_In_ PFLT_FILTER Filter, _In_ ACCESS_MASK DesiredAccess, _In_opt_ PUNICODE_STRING SubKey, _Out_ PHANDLE Handle)
NTSTATUS FltpReadRegistryValue(_In_ HANDLE KeyHandle, _In_ PUNICODE_STRING ValueName, _In_opt_ ULONG Type, _Out_writes_bytes_(BufferSize) PVOID Buffer, _In_ ULONG BufferSize, _Out_opt_ PULONG BytesRequired)
_Must_inspect_result_ _In_opt_ PFLT_FILTER Filter
_Must_inspect_result_ _Out_ PNDIS_STATUS _In_ NDIS_HANDLE _In_ ULONG _Out_ PNDIS_STRING _Out_ PNDIS_HANDLE KeyHandle
#define _Out_writes_bytes_(s)
_Must_inspect_result_ _In_ WDFDEVICE _In_ ULONG _In_ ACCESS_MASK DesiredAccess
_In_ WDFMEMORY _Out_opt_ size_t * BufferSize
_Must_inspect_result_ _In_ WDFKEY _In_ PCUNICODE_STRING ValueName