>我做了一个简单的程序来将文本写入现有文件:
;; 写入现有文件
(define write-to-a-file
(lambda (path txt)
(call-with-output-file path
(lambda (output-port)
(write txt output-port)))))
但是我想修改它,以便如果该文件不存在,则应创建它。如果该文件存在,则它应该写入该文件,而不删除该文件的先前内容。我正在写鸡肉计划。有什么想法吗?
试试这个鸡方案:
(define (write-to-a-file path txt)
(call-with-output-file path
(lambda (output-port)
(write txt output-port))
#:append))
或者这个对于球拍:
(define (write-to-a-file path txt)
(call-with-output-file path
(lambda (output-port)
(write txt output-port))
#:exists 'append))