ltk问题(常见的lisp)

Question

我用asdf-install将ltk安装到，但我甚至不能开始使用它V_V，下面的代码是文档中最简单的示例，几乎是逐字复制的。

(asdf:operate 'asdf:load-op :ltk)

(defun hello-1()
  (with-ltk ()
   (let ((b (make-instance 'button
                           :master nil
                           :text "Press Me"
                           :command (lambda ()
                                      (format t "Hello World!~&")))))
     (pack b))))
(hello-1)

这是从sbcl获得的错误消息：

> ; in: LAMBDA NIL
;     (PACK B)
; 
; caught STYLE-WARNING:
;   undefined function: PACK

;     (WITH-LTK NIL
;      (LET ((B (MAKE-INSTANCE 'BUTTON :MASTER NIL :TEXT "Press Me" :COMMAND #)))
;        (PACK B)))
; 
; caught STYLE-WARNING:
;   undefined function: WITH-LTK
; 
; compilation unit finished
;   Undefined functions:
;     PACK WITH-LTK
;   caught 2 STYLE-WARNING conditions

debugger invoked on a SIMPLE-ERROR in thread #<THREAD "initial thread" RUNNING {1002A57B61}>:
  There is no class named BUTTON.

Type HELP for debugger help, or (SB-EXT:QUIT) to exit from SBCL.

restarts (invokable by number or by possibly-abbreviated name):
  0: [ABORT] Exit debugger, returning to top level.

(SB-PCL::FIND-CLASS-FROM-CELL BUTTON NIL T)

Answer 1

ASDF不会将包加载到通用LISP用户包中。因此，在当前包中没有定义WITH-LTK，因此需要这样做：

(asdf:oos 'asdf:load-op :ltk)
(in-package :ltk)
;put your function here