---
title: "addWhoHeader(_:length:)"
framework: foundation
role: symbol
role_heading: Instance Method
path: "foundation/nsmutabledictionary/addwhoheader(_:length:)"
---

# addWhoHeader(_:length:)

## Declaration

```swift
func addWhoHeader(_ inHeaderData: UnsafeRawPointer!, length inHeaderDataLength: UInt32) -> OBEXError
```