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Showing content from http://docs.racket-lang.org/reference/stringport.html below:

13.1.6 String Ports

A string port reads or writes from a byte string. An input string port can be created from either a byte string or a string; in the latter case, the string is effectively converted to a byte string using string->bytes/utf-8. An output string port collects output into a byte string, but get-output-string conveniently converts the accumulated bytes to a string.

Input and output string ports do not need to be explicitly closed. The file-position procedure works for string ports in position-setting mode.

Byte Strings also provides information on bytestrings.

Added in version 6.0.1.6 of package base.

Creates an input

that reads characters from

(see

). Modifying

afterward does not affect the byte stream produced by the port. The optional

argument is used as the name for the returned port.

Examples:

Strings also provides information on strings.

Creates an input

that reads bytes from the UTF-8 encoding (see

) of

. The optional

argument is used as the name for the returned port.

Examples:

Creates an output

that accumulates the output into a byte string. The optional

argument is used as the name for the returned port.

Examples:

Examples:

If reset? is true, then all bytes are removed from the port, and the port’s position is reset to 0; if reset? is #f, then all bytes remain in the port for further accumulation (so they are returned for later calls to get-output-bytes or get-output-string), and the port’s position is unchanged.

The start-pos and end-pos arguments specify the range of bytes in the port to return; supplying start-pos and end-pos is the same as using subbytes on the result of get-output-bytes, but supplying them to get-output-bytes can avoid an allocation. The end-pos argument can be #f, which corresponds to not passing a second argument to subbytes.

Examples:

Examples:

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