typedef struct _WNF_STATE_NAME ULONG Data[2]; WNF_STATE_NAME;
NTSTATUS NtQueryWnfStateData( _In_ PCO_WNF_STATE_NAME StateName, _In_opt_ PWNF_TYPE_ID TypeId, _In_opt_ const VOID* ExplicitScope, _Out_ PWNF_CHANGE_STAMP ChangeStamp, _Out_writes_bytes_to_opt_(*BufferSize, *BufferSize) PVOID Buffer, _Inout_ PULONG BufferSize ); Use code with caution. Why Direct Execution inside ntdll.dll Is Better
NtQueryWnfStateData is an undocumented ntdll.dll function introduced in Windows 8 that allows processes to directly query ("pull") state information from the Windows Notification Facility (WNF). It is favored for system status monitoring and security research, providing immediate access to state data without needing to subscribe to updates. For a technical overview of this function, visit ntdoc.m417z.com NtCreateWnfStateName - NtDoc ntquerywnfstatedata ntdlldll better
against Registry queries. Let me know which area you'd like to dive into next! Share public link
Complex access control configurations; requires managing open connection handles. For a technical overview of this function, visit ntdoc
Because NtQueryWnfStateData is not formally documented, developers must rely on reverse engineering or header files from projects like System Informer .
WNF channels are protected by distinct security descriptors. If a thread lacks the necessary privileges for a specific state name, NtQueryWnfStateData will fail with an access violation ( 0xC0000022 ). Because NtQueryWnfStateData is not formally documented
: It avoids the need for complex IPC (Inter-Process Communication) setups like named pipes or ALPC for simple state-sharing tasks. Function Prototype Though undocumented, research into has established the following general prototype for NtQueryWnfStateData
Because the function is completely undocumented, developers must define its function signature and look up its entry point dynamically within . Below is a look at how to define and use the function in C++. Function Signature Definition
Below is an overview of how to use this function effectively, synthesized from community research and reverse engineering. Understanding NtQueryWnfStateData NtQueryWnfStateData