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

# addImageDescriptorHeader(_:length:)

## Declaration

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