- iOS 7.0+
- macOS 10.5+
- tvOS 9.0+
The source JSString.
The destination byte buffer into which to copy a null-terminated UTF8 representation of string. On return, buffer contains a UTF8 string representation of string. If bufferSize is too small, buffer will contain only partial results. If buffer is not at least bufferSize bytes in size, behavior is undefined.
The size of the external buffer in bytes.
The number of bytes written into buffer (including the null-terminator byte).