> 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/kernel32/createmailslot.md).

# CreateMailslotW

```csharp
[DllImport("KERNEL32.dll", ExactSpelling = true, SetLastError = true)]
[DefaultDllImportSearchPaths(DllImportSearchPath.System32)]
public static extern unsafe HANDLE CreateMailslotW(
    PCWSTR lpName,
    uint nMaxMessageSize,
    uint lReadTimeout,
    [Optional] SECURITY_ATTRIBUTES* lpSecurityAttributes);
```