> 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/amsi/amsiopensession.md).

# AmsiOpenSession

```csharp
[DllImport("Amsi.dll", ExactSpelling = true)]
[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
public static extern unsafe HRESULT AmsiOpenSession(
    HAMSICONTEXT amsiContext,
    HAMSISESSION* amsiSession);
```

[HAMSICONTEXT](/antimalware/hamsicontext.md)

[HAMSISESSION](/antimalware/hamsisession.md)