[armedbear-devel] how to redirect format function to a socket stream

Erik Huelsmann ehuels at gmail.com
Sun May 13 19:15:54 UTC 2012

Hi Santiago,

Welcome to Armed Bear Common Lisp (and Common Lisp in general)!

I've a socket stream named "socket" in this port and host: 50362 and
> localhost
> I've written this function to redirect format function to the socket but
> only appears NIL. How can I redirect format t lisp function to a socket?
> (defun colors()
> (WITH-OPEN-STREAM (socket (SOCKET:SOCKET-CONNECT 50362 "localhost"))
>  (let ((*standard-output* socket))
> (format t "The color is ~A" "red")
>  )))

Maybe the underlying stream wants to optimize the socket writes and keeps
your write buffered for now? In that case, you want to use FORCE-OUTPUT to
make sure all internal buffers get written to the stream.

Hope that helps!


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