Appends a C string to the character contents of a CFMutableString object.
- iOS 2.0+
- macOS 10.0+
- Mac Catalyst 13.0+
- tvOS 9.0+
- watchOS 2.0+
- Core Foundation
The string to which the characters from
care appended. If this value is not a CFMutableString object, an assertion is raised.
A pointer to a C string buffer.
The encoding of the characters in