# CFURLGetFileSystemRepresentation(_:_:_:_:) Fills a buffer with the file system’s native string representation of a given URL’s path. ``` func CFURLGetFileSystemRepresentation(_ url: CFURL!, _ resolveAgainstBase: Bool, _ buffer: UnsafeMutablePointer!, _ maxBufLen: CFIndex) -> Bool ``` ## Parameters `url` The `CFURL` object whose native file system representation you want to obtain. `resolveAgainstBase` Pass `true` to return an absolute path name. `buffer` A pointer to a character buffer. On return, the buffer holds the native file system’s representation of `url`. The buffer is null-terminated. This parameter must be at least `maxBufLen` in size for the file system in question to avoid failures for insufficiently large buffers. `maxBufLen` The maximum number of characters that can be written to `buffer`. ## Return Value `true` if successful, `false` if an error occurred. ## Discussion No more than `maxBufLen` bytes are written to `buffer`. If `url` requires more than `maxBufLen` bytes to represent itself, including the terminating null byte, this function returns `false`. To avoid this possible failure, you should pass a buffer with size of at least the maximum path length for the file system in question. --- 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)