使用Scheme检测二进制文件中的EOF

Question

(define (read-all-input)
  (local ((define line (bytes->list (read-bytes 4))))
    (if (eof-object? line)
        empty
        (cons line (read-all-input)))))

(void (read-all-input))

上面的代码失败，因为 bytes->list 需要一个字节字符串类型的参数，但给出了 #

Answer 1

#lang scheme

(define (read-all-input)
 (let ((b (read-bytes 4)))
  (cond
   ((eof-object? b) empty)
   (else (cons b (read-all-input)))
)))

(void (read-all-input))

该函数将字节读取到字节列表中。

Answer 2

我不太确定你想要获得什么，但这是我的尝试：

(define read-all-input
  (lambda ()
      (let ((line (read-bytes 4)))
        (if (eof-object? line)
            '()
            (cons (bytes->list line) (read-all-input))))))