: Because the data resides in the kernel memory pool, it is highly efficient for system-wide broadcasts Helpful Resources
To monitor a state, you need the 64-bit State Name (often found in security research tools like SharpWnfSuite ).
What specific or system data are you attempting to query? ntquerywnfstatedata ntdlldll better
// Focus Assist state WNF_STATE_NAME state 0xA3BF1C75, 0xD83063E ; WNF_CHANGE_STAMP stamp = 0; DWORD buffer = 0; ULONG size = sizeof(buffer);
#define NT_SUCCESS(Status) (((NTSTATUS)(Status)) >= 0) : Because the data resides in the kernel
The WNF_STATE_NAME structure must be packed exactly as the kernel expects. Most compilers handle this automatically, but explicit #pragma pack directives can prevent subtle alignment bugs.
In the deep, often undocumented territory of Windows internals, ntdll.dll reigns supreme as the primary user-mode interface to the kernel. Among its specialized, undocumented functions, NtQueryWnfStateData stands out as a powerful mechanism for accessing real-time system state information. While standard APIs like QueryServiceStatusEx or Registry queries provide high-level snapshots, NtQueryWnfStateData allows for faster, more granular, and often more revealing insights. NtQueryWnfStateData allows for faster
typedef NTSTATUS(NTAPI* _NtQueryWnfStateData)( _In_ PULONG64 StateName, _In_opt_ PWNF_TYPE_ID TypeId, _In_opt_ PVOID ExplicitScope, _Out_ PULONG ChangeSequenceNumber, _Out_writes_bytes_to_opt_(*BufferLength, *BufferLength) PVOID Buffer, _Inout_ PULONG BufferLength ); Use code with caution. Argument Analysis: