call-with-bytevector-output-port - call a procedure with a bytevector output port

(import (rnrs))                     ;R6RS
(import (rnrs io ports))            ;R6RS

(call-with-bytevector-output-port proc)
(call-with-bytevector-output-port proc maybe-transcoder)

Creates an output port that accumulates the bytes written to it and calls proc with that output port as an argument. Whenever proc returns, a bytevector consisting of all of the port's accumulated bytes (regardless of the port’s current position) is returned and the port is closed.

The transcoder associated with the output port is determined as for a call to open-bytevector-output-port(3scm).

Returns a single value; a bytevector.

(call-with-bytevector-output-port
  (lambda (p)
    (put-u8 p 7)))
        => #vu8(7)
(call-with-bytevector-output-port
  (lambda (p)
    (put-string p "0123"))
  (native-transcoder))
        => #vu8(48 49 50 51)

This procedure is commonly used when creating bytevectors piecemeal.

This procedure is unique to R6RS. It is a wrapper around open-bytevector-output-port(3scm).

This procedure can raise exceptions with the following condition types:

&assertion (R6RS)

The wrong number of arguments was passed or an argument was outside its domain. In particular, proc must be a procedure that can accept one argument, and maybe-transcoder must be a transcoder or #f.

open-bytevector-output-port(3scm), open-bytevector-input-port(3scm)

R6RS

This procedure is new to the reworked I/O in R6RS.

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