objc:bytes

(objc:bytes data)

The contents of an NSData as a packed (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.

Part of the macOS-only objc package -- the interpreter (java -jar, or the rontolisp native binary) and a compiled .class / .jar, 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> (length (objc:bytes (objc:send (objc:string "hello") "dataUsingEncoding:" 4)))
5