# CFURLCreateResourcePropertyForKeyFromBookmarkData(_:_:_:) Returns the value of a resource property from specified bookmark data. ``` func CFURLCreateResourcePropertyForKeyFromBookmarkData(_ allocator: CFAllocator!, _ resourcePropertyKey: CFString!, _ bookmark: CFData!) -> 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. `resourcePropertyKey` The resource property key. See [Common File System Resource Keys](/documentation/CoreFoundation/common-file-system-resource-keys) for a list of possible keys. `bookmark` The bookmark data the resource value is derived from. ## Return Value The resource property value. ## Discussion This function does not attempt to resolve the bookmark data or perform I/O. --- 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)