c - 如何从对 ffi :c-inline in ecl? 的调用中返回字符串

Question

如何从对 ffi:c-inline 的调用中返回字符串常量？

我尝试了以下变体，但没有成功(ORGANIZATION 是在constants.h 中定义的常量):

(ffi:clines "#include \"./constants.h\"")
(ffi:c-inline () () :string "ORGANIZATION" :one-liner t)

上面的示例会导致以下编译器错误:

Unknown representation type :STRING

Answer 1

使用:cstring代替:string:

constants.h:

#define ORGANIZATION "foobar"

ecl.lsp:

(ffi:clines "#include \"./constants.h\"")
(defun myfun ()
  (ffi:c-inline () () :cstring "ORGANIZATION" :one-liner t))

来自 ecl 提示符:

> (compile-file "ecl.lsp" :load t)
...
> (myfun)

"foobar"
> 

引用:https://ecl.common-lisp.dev/static/manual/Foreign-Function-Interface.html#Primitive-Types