objc Package Functions

The objc package binds the Objective-C runtime and AppKit through the foreign function API — no reflection, so unlike java: it works in the native binary as well as under java -jar. It is macOS, interpreter only (a compiled .class or .wasm refuses it) and not part of Common Lisp; reference its functions with the objc: qualifier. Each name below links to its own page; the macOS GUI guide covers marshalling, threads, ownership and the native binary's shape table.

Function	Example	Result
`objc:class`	`(objc:class "NSWindow")`	a class (`#<objc NSWindow>`)
`objc:send`	`(objc:send (objc:string "hi") "length")`	the result, marshalled by the selector's declared type
`objc:define-class`	`(objc:define-class "Target" "NSObject" (list (list "invoke:" fn)))`	a class whose methods are Lisp functions
`objc:on-main`	`(objc:on-main (lambda () ...))`	the function's value, computed on the main thread
`objc:string`	`(objc:string "hi")`	an `NSString`
`objc:data`	`(objc:data buffer)`	an `NSMutableData` holding the buffer's bytes
`objc:bytes`	`(objc:bytes data)`	an `NSData`'s bytes as a packed `(unsigned-byte 8)` vector
`objc:address`	`(objc:address obj)`	the object's address, an integer
`objc:objectp`	`(objc:objectp x)`	`t` for an Objective-C object