objc:bytes

(objc:bytes data)

The contents of an NSData (or any object answering length and bytes as one does) as a fresh (unsigned-byte 8) vector. The read direction of objc:data: give a selector an objc:data block to write into, then read back what it wrote. Anything but an object pointer -- a class included -- signals an error.

Not in LispWorks' interface. Part of the macOS-only objc package -- the interpreter (java -jar, or the rontolisp native binary), a compiled .class / .jar and a --native executable for macOS on Apple silicon, never a .wasm; on a machine without the runtime it signals an error. See the macOS GUI guide.

CL-USER> (objc:bytes (objc:data "hi"))
#(104 105)
CL-USER> (objc:bytes (objc:invoke (objc:string-to-ns-string "hello") "dataUsingEncoding:" 4))
#(104 101 108 108 111)