將輸出寫入字串
巨集 WITH-OUTPUT-TO-STRING
可用於建立字串輸出流,並在結尾返回結果字串。
(with-output-to-string (str)
(write-line "Foobar!" str)
(write-string "Barfoo!" str))
;=> "Foobar!
; Barfoo!"
同樣可以使用 MAKE-STRING-OUTPUT-STREAM
和 GET-OUTPUT-STREAM-STRING
手動完成。
(let ((str (make-string-output-stream)))
(write-line "Foobar!" str)
(write-string "Barfoo!" str)
(get-output-stream-string str))