R5RS Scheme输入输出：如何将文本写入/附加到输出文件？ [英] R5RS Scheme input-output: How to write/append text to an output file?

问题描述

在符合R5RS的Scheme版本中，将文本输出到文件的简单方法是什么？
我使用MIT的MEEP（使用Scheme进行脚本编写），我想将文本输出到文件。我在Stackoverflow上找到了以下其他答案：

What is a simple way to output text to file in a R5RS compliant version of Scheme? I use MIT's MEEP (which uses Scheme for scripting) and I want to output text to file. I have found the following other answers on Stackoverflow:

文件I / O操作 - 方案

如何使用Scheme附加到文件

将字符串附加到IronScheme中的现有文本文件[sic]

但是，他们并不是我想要的。

But, they weren't exactly what I was looking for.

推荐答案

Charlie Martin，Ben Rudgers和Vijay Mathew的答案是非常有帮助，但我想给出一个简单易懂的答案，对于新的Schemers，比如我自己：）

The answers by Charlie Martin, Ben Rudgers, and Vijay Mathew were very helpful, but I would like to give an answer which is simple and easy to understand for new Schemers, like myself :)

; This call opens a file in the append mode (it will create a file if it doesn't exist)
(define my-file (open-file "my-file-name.txt" "a"))

; You save text to a variable
(define my-text-var1 "This is some text I want in a file")
(define my-text-var2 "This is some more text I want in a file")

; You can output these variables or just text to the file above specified
; You use string-append to tie that text and a new line character together.
(display (string-append my-text-var1 "\r\n" my-file))
(display (string-append my-text-var2 "\r\n" my-file))
(display (string-append "This is some other text I want in the file" "\r\n" my-file))

; Be sure to close the file, or your file will not be updated.
(close-output-port my-file)

并且，对于任何挥之不去的问题整个\\ n的事情，请看以下答案：

And, for any lingering questions about the whole "\r\n" thing, please see the following answer:

\ r和\ n之间有什么区别？

干杯！

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