# CFURLCreateBookmarkDataFromFile(_:_:_:) Initializes and returns bookmark data derived from a file pointed to by a specified URL. ``` func CFURLCreateBookmarkDataFromFile(_ allocator: CFAllocator!, _ fileURL: CFURL!, _ errorRef: UnsafeMutablePointer?>!) -> Unmanaged! ``` ## Parameters `allocator` The allocator to use to allocate memory for the new `CFURL` object. Pass `NULL` or [`kCFAllocatorDefault`](/documentation/CoreFoundation/kCFAllocatorDefault) to use the current default allocator. `fileURL` The file URL. `errorRef` The error that occurred in the case that the bookmark data cannot be created. ## Return Value The bookmark data for the file, or `NULL` if an error occurs. ## 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)