# CFPropertyListWrite(_:_:_:_:_:) Write the bytes of a serialized property list out to a stream. ``` func CFPropertyListWrite(_ propertyList: CFPropertyList!, _ stream: CFWriteStream!, _ format: CFPropertyListFormat, _ options: CFOptionFlags, _ error: UnsafeMutablePointer?>!) -> CFIndex ``` ## Parameters `propertyList` The property list to write out. `stream` The CFWriteStream to which to write the data. The stream must be opened and configured. `format` A CFPropertyListFormat constant to specify the data format. See [`CFPropertyListFormat`](/documentation/CoreFoundation/CFPropertyListFormat) for possible values. `options` This parameter is currently unused and should be set to `0`. `error` If this parameter is non-NULL, if an error occurs, on return this will contain a CFError error describing the problem. Ownership follows the [The Create Rule](https://developer.apple.com/library/archive/documentation/CoreFoundation/Conceptual/CFMemoryMgmt/Concepts/Ownership.html#//apple_ref/doc/uid/20001148-103029). ## Return Value The number of bytes written to `stream`. If an error occurs, returns `0`. ## 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)