String Ports

Scheme input and output can be read from or collected into a string:

• (open-input-string string) creates an input port that reads characters from string.
• (open-output-string) creates an output port that accumulates the output into a string.
• (get-output-string string-output-port) returns the string accumulated in string-output-port.

String input and output ports do not need to be explicitly closed. The file-position procedure, described in section 11.1.5, works specially for string ports.

Example:

  (define i (open-input-string "hello world"))
  (define o (open-output-string))
  (write (read i) o)
  (get-output-string o) ; => "hello"