> For the complete documentation index, see [llms.txt](https://www.pinvoke.dev/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.pinvoke.dev/ntdll/ntqueryinformationprocess.md).

# NtQueryInformationProcess

```csharp
[DllImport("ntdll.dll", ExactSpelling = true)]
[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
public static extern unsafe NTSTATUS NtQueryInformationProcess(
    HANDLE processHandle,
    PROCESSINFOCLASS processInformationClass,
    void* processInformation,
    uint processInformationLength,
    uint* returnLength);
```

[PROCESSINFOCLASS](/wdk/processinfoclass.md)