# Common File System Resource Keys Keys that are applicable to file system URLs. ## Topics ### Constants [`kCFURLNameKey`](/documentation/CoreFoundation/kCFURLNameKey) Key for the resource’s name in the file system, returned as a `CFString` object. [`kCFURLLocalizedNameKey`](/documentation/CoreFoundation/kCFURLLocalizedNameKey) Key for the resource’s localized or extension-hidden name, retuned as a `CFString` object. [`kCFURLPathKey`](/documentation/CoreFoundation/kCFURLPathKey) A `CFString` value containing the URL’s path as a file system path. (read-only) [`kCFURLIsRegularFileKey`](/documentation/CoreFoundation/kCFURLIsRegularFileKey) Key for determining whether the resource is a regular file, as opposed to a directory or a symbolic link. Returned as a `CFBoolean` object. [`kCFURLIsDirectoryKey`](/documentation/CoreFoundation/kCFURLIsDirectoryKey) Key for determining whether the resource is a directory, returned as a `CFBoolean` object. [`kCFURLIsSymbolicLinkKey`](/documentation/CoreFoundation/kCFURLIsSymbolicLinkKey) Key for determining whether the resource is a symbolic link, returned as a `CFBoolean` object. [`kCFURLIsVolumeKey`](/documentation/CoreFoundation/kCFURLIsVolumeKey) Key for determining whether the resource is the root directory of a volume, returned as a `CFBoolean` object. [`kCFURLIsPackageKey`](/documentation/CoreFoundation/kCFURLIsPackageKey) Key for determining whether the resource is a packaged directory, returned as a `CFBoolean` object. [`kCFURLIsSystemImmutableKey`](/documentation/CoreFoundation/kCFURLIsSystemImmutableKey) Key for determining whether the resource’s system immutable bit is set, returned as a `CFBoolean` object. [`kCFURLIsUserImmutableKey`](/documentation/CoreFoundation/kCFURLIsUserImmutableKey) Key for determining whether the resource’s user immutable bit is set, returned as a `CFBoolean` object. [`kCFURLIsHiddenKey`](/documentation/CoreFoundation/kCFURLIsHiddenKey) Key for determining whether the resource is normally not displayed to users, returned as a `CFBoolean` object. [`kCFURLHasHiddenExtensionKey`](/documentation/CoreFoundation/kCFURLHasHiddenExtensionKey) Key for determining whether the resource’s extension is normally removed from its localized name, returned as a `CFBoolean` object. [`kCFURLCreationDateKey`](/documentation/CoreFoundation/kCFURLCreationDateKey) Key for the resource’s creation date, returned as a `CFDate` object if the volume supports creation dates, or `nil` if creation dates are unsupported. [`kCFURLContentAccessDateKey`](/documentation/CoreFoundation/kCFURLContentAccessDateKey) Key for the last time the resource was accessed, returned as a `CFDate` object if the volume supports access dates, or `nil` if access dates are unsupported. [`kCFURLContentModificationDateKey`](/documentation/CoreFoundation/kCFURLContentModificationDateKey) Key for the last time the resource was modified, returned as a `CFDate` object if the volume supports modification dates, or `nil` if modification dates are unsupported. [`kCFURLAttributeModificationDateKey`](/documentation/CoreFoundation/kCFURLAttributeModificationDateKey) Key for the last time the resource’s attributes were modified, returned as a `CFDate` object if the volume supports attribute modification dates, or `nil` if attribute modification dates are unsupported. [`kCFURLLinkCountKey`](/documentation/CoreFoundation/kCFURLLinkCountKey) Key for the number of hard links to the resource, returned as a `CFNumber` object. [`kCFURLParentDirectoryURLKey`](/documentation/CoreFoundation/kCFURLParentDirectoryURLKey) Key for the parent directory of the resource, returned as a `CFURL` object, or `nil` if the resource is the root directory of its volume. [`kCFURLVolumeURLKey`](/documentation/CoreFoundation/kCFURLVolumeURLKey) Key for the root directory of the resource’s volume, returned as a `CFURL` object. [`kCFURLTypeIdentifierKey`](/documentation/CoreFoundation/kCFURLTypeIdentifierKey) Key for the resource’s uniform type identifier (UTI), returned as a `CFString` object. [`kCFURLLocalizedTypeDescriptionKey`](/documentation/CoreFoundation/kCFURLLocalizedTypeDescriptionKey) Key for the resource’s localized type description, returned as a `CFString` object. [`kCFURLLabelNumberKey`](/documentation/CoreFoundation/kCFURLLabelNumberKey) Key for the resource’s label number, returned as a `CFNumber` object. [`kCFURLLabelColorKey`](/documentation/CoreFoundation/kCFURLLabelColorKey) Key for the resource’s label color, returned as a `CFColorRef` object, or `NULL` if the resource has no label color. [`kCFURLLocalizedLabelKey`](/documentation/CoreFoundation/kCFURLLocalizedLabelKey) Key for the resource’s localized label text, returned as a `CFString` object, or `NULL` if the resource has no localized label text. [`kCFURLEffectiveIconKey`](/documentation/CoreFoundation/kCFURLEffectiveIconKey) Key for the resource’s typical icon, returned as a `CGImageRef` object. [`kCFURLCustomIconKey`](/documentation/CoreFoundation/kCFURLCustomIconKey) Key for the icon stored with the resource, returned as a `CGImageRef` object, or `NULL` if the resource has no custom icon. [`kCFURLFileResourceIdentifierKey`](/documentation/CoreFoundation/kCFURLFileResourceIdentifierKey) Key for the resource’s unique identifier, returned as a `CFType` object. [`kCFURLVolumeIdentifierKey`](/documentation/CoreFoundation/kCFURLVolumeIdentifierKey) Key for the unique identifier of the resource’s volume, returned as a `CFType` object. [`kCFURLPreferredIOBlockSizeKey`](/documentation/CoreFoundation/kCFURLPreferredIOBlockSizeKey) Key for the optimal block size to use when reading or writing this file’s data, returned as a `CFNumber` object, or `NULL` if the preferred size is not available. [`kCFURLIsReadableKey`](/documentation/CoreFoundation/kCFURLIsReadableKey) Key for determining whether the current process (as determined by the EUID) can read the resource, returned as a `CFBoolean` object. [`kCFURLIsWritableKey`](/documentation/CoreFoundation/kCFURLIsWritableKey) Key for determining whether the current process (as determined by the EUID) can write to the resource, returned as a `CFBoolean` object. [`kCFURLIsExecutableKey`](/documentation/CoreFoundation/kCFURLIsExecutableKey) Key for determining whether the current process (as determined by the EUID) can execute the resource (if it is a file) or search the resource (if it is a directory), returned as a `CFBoolean` object. [`kCFURLFileSecurityKey`](/documentation/CoreFoundation/kCFURLFileSecurityKey) Key for the resource’s security information, returned as a `CFFileSecurity` object. [`kCFURLIsExcludedFromBackupKey`](/documentation/CoreFoundation/kCFURLIsExcludedFromBackupKey) [`kCFURLFileResourceTypeKey`](/documentation/CoreFoundation/kCFURLFileResourceTypeKey) Key for the resource’s object type, returned as a `CFString` object. --- 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)