typedef struct _WNF_TYPE_ID GUID TypeId; WNF_TYPE_ID, *PWNF_TYPE_ID;
NTSTATUS NtQueryWnfStateData( PCWNF_STATE_NAME StateName, PCWNF_TYPE_ID TypeId, const VOID* ExplicitScope, PWNF_CHANGE_STAMP ChangeStamp, PVOID Buffer, PULONG BufferSize ); Use code with caution. : The 64-bit identifier of the WNF state. Buffer : Pointer to the memory receiving the data. ntquerywnfstatedata ntdlldll better
ntdll.dll serves as the gateway between user-mode applications and the Windows kernel. All WNF operations, whether creating, deleting, reading, or updating states, are marshaled through this DLL. It exposes several related system calls beyond NtQueryWnfStateData : You’ll still need to dynamically load them with
These have the same stability risks but at least follow a more predictable RTL pattern. You’ll still need to dynamically load them with GetProcAddress . // Typically 0 PVOID StateName
#include <windows.h> #include <winternl.h> // For NTSTATUS definitions
NTSTATUS NtQueryWnfStateData( HANDLE StateHandle, // Handle to a WNF state (if known) ULONG Unknown1, // Typically 0 PVOID StateName, // Pointer to the 128-bit WNF state name PVOID Buffer, // Output buffer for state data PULONG BufferSize, // Input: buffer size, Output: bytes written PVOID Unknown2, // Possibly timestamp or change stamp PVOID Unknown3 // Reserved );
Because of these risks, any use of NtQueryWnfStateData in production software must be carefully considered and ideally isolated behind a robust fallback mechanism. It is far better suited for diagnostic tools, security research, and systems programming experimentation than for applications that require long-term stability.