Ntquerywnfstatedata Ntdlldll Better __top__ File

CloseHandle(hState);

Because WNF powers many Windows features, NtQueryWnfStateData can be used to read all kinds of system state that are not exposed through the regular Win32 API. Here are three practical examples.

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: 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

Using undocumented APIs is risky. Microsoft explicitly does not support them for third‑party applications, and they can change or be removed without warning. While WNF itself is stable (it has been used internally since Windows 8), the specific behavior of NtQueryWnfStateData could vary between Windows 10, 11, and future versions. This link or copies made by others cannot be deleted

First, you need to open the WNF state using NtOpenWnfState (another undocumented function) and then query it.

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Always check the returned BufferSize after the call. The function may indicate that the buffer was too small by returning STATUS_BUFFER_TOO_SMALL . In that case, reallocate a larger buffer and call again.

Because ntdll.dll is so fundamental, it contains hundreds of exported functions. Some are well documented (like RtlGetVersion ), but many are kept internal by Microsoft. This is where NtQueryWnfStateData lives—undocumented, unsupported for third‑party use, but extremely useful for those who know how to wield it.

return 0;