# CFBundleOpenBundleResourceFiles(_:_:_:) Opens the non-localized and localized resource files (if any) for a bundle in separate resource maps. ``` func CFBundleOpenBundleResourceFiles(_ bundle: CFBundle!, _ refNum: UnsafeMutablePointer!, _ localizedRefNum: UnsafeMutablePointer!) -> Int32 ``` ## Parameters `bundle` The bundle whose resource map you want to open. `refNum` On return, the reference number of the non-localized resource map. `localizedRefNum` On return, the reference number of the localized resource map. ## Return Value An error code. The function returns `0` (`noErr`) if successful. If the bundle contains more than one resource file, the function returns an error code only if none was opened. The most common error is `resFNotFound`, but the function may also pass through other errors returned from the Resource Manager. ## 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)