# CFPreferencesGetAppBooleanValue(_:_:_:) Convenience function that directly obtains a Boolean preference value for the specified key. ``` func CFPreferencesGetAppBooleanValue(_ key: CFString, _ applicationID: CFString, _ keyExistsAndHasValidFormat: UnsafeMutablePointer?) -> Bool ``` ## Parameters `key` The preference key whose value to obtain. The key must specify a preference whose value is of type `Boolean`. `applicationID` The identifier of the application whose preferences are searched, typically [`kCFPreferencesCurrentApplication`](/documentation/CoreFoundation/kCFPreferencesCurrentApplication). Do not pass `NULL` or [`kCFPreferencesAnyApplication`](/documentation/CoreFoundation/kCFPreferencesAnyApplication). Takes the form of a Java package name, such as `com.foosoft`. `keyExistsAndHasValidFormat` On return, `true` if the preference value for the specified key was located and found to be of type `Boolean`, otherwise `false`. ## Return Value The preference data for the specified key and application, or if no value was located, `false`. ## 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)