Ntquerywnfstatedata Ntdlldll Better __full__ Here
: WNF payloads vary up to 4KB. Always call NtQueryWnfStateData first with a Buffer set to NULL and BufferSize set to 0 . The API will return STATUS_BUFFER_TOO_SMALL along with the exact size required. Dynamically allocate your buffer based on that return value and query a second time.
: You passed an incorrectly formatted state name or a state name that does not exist on the current system.
#include #include // Define necessary internal structures typedef struct _WNF_STATE_NAME ULONG Data[2]; WNF_STATE_NAME, *PWNF_STATE_NAME; typedef ULONG WNF_CHANGE_STAMP, *PWNF_CHANGE_STAMP; // Function pointer prototype typedef NTSTATUS(NTAPI* _NtQueryWnfStateData)( _In_ PWNF_STATE_NAME StateName, _In_opt_ PVOID TypeId, _In_opt_ const VOID* ExplicitScope, _Out_ PWNF_CHANGE_STAMP ChangeStamp, _Out_ PVOID Buffer, _Inout_ PULONG BufferSize ); int main() // Load ntdll.dll HMODULE hNtDll = GetModuleHandleW(L"ntdll.dll"); if (!hNtDll) return -1; // Resolve the function address _NtQueryWnfStateData NtQueryWnfStateData = (_NtQueryWnfStateData)GetProcAddress(hNtDll, "NtQueryWnfStateData"); if (!NtQueryWnfStateData) std::cerr << "Failed to locate NtQueryWnfStateData" << std::endl; return -1; // Example Well-Known WNF State Name: WNF_SHEL_DESKTOP_APPLICATION_STARTED // Actual 64-bit codes vary by Windows build and target state WNF_STATE_NAME TargetState = 0x41C6013F, 0x0B830033 ; BYTE DataBuffer[256] = 0 ; ULONG BufferSize = sizeof(DataBuffer); WNF_CHANGE_STAMP ChangeStamp = 0; // Execute the native call NTSTATUS status = NtQueryWnfStateData(&TargetState, nullptr, nullptr, &ChangeStamp, DataBuffer, &BufferSize); if (status == 0) // STATUS_SUCCESS std::cout << "Successfully queried WNF State!" << std::endl; std::cout << "Current Change Stamp: " << ChangeStamp << std::endl; std::cout << "Bytes Returned: " << BufferSize << std::endl; else std::cerr << "NTSTATUS Error Code: 0x" << std::hex << status << std::endl; return 0; Use code with caution. Architectural Drawbacks and Mitigation ntquerywnfstatedata ntdlldll better
, a hidden publish-subscribe system used by Windows since version 8
: A crucial security and sync mechanism. This receives a monotonically increasing integer that increments every time the data updates, preventing race conditions or processing duplicate states. : WNF payloads vary up to 4KB
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Understanding each parameter is crucial for implementing correct error handling: Dynamically allocate your buffer based on that return
While undocumented officially by Microsoft, reverse-engineering efforts map the function signature roughly as follows:
Why NtQueryWnfStateData is "Better" for Low-Level Development