# xpc_dictionary_set_data(_:_:_:_:) Inserts a raw data value into a dictionary. ``` func xpc_dictionary_set_data(_ xdict: xpc_object_t, _ key: UnsafePointer, _ bytes: UnsafeRawPointer?, _ length: Int) ``` ## Parameters `xdict` The dictionary which is to be manipulated. `key` The key for which the primitive value shall be set. `bytes` The bytes to insert. After calling this method, the XPC object corresponding to the primitive value inserted may be safely retrieved with [`xpc_dictionary_get_value(_:_:)`](/documentation/XPC/xpc_dictionary_get_value(_:_:)). `length` The length of the data. ## Discussion --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)