# CFStringAppendCharacters(_:_:_:) Appends a buffer of Unicode characters to the character contents of a CFMutableString object. ``` func CFStringAppendCharacters(_ theString: CFMutableString!, _ chars: UnsafePointer!, _ numChars: CFIndex) ``` ## Parameters `theString` The string to which the characters in `chars` are appended. `chars` A pointer to a buffer of Unicode characters. `numChars` The number of Unicode characters in `chars`. ## 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)