Thank you Adrian! Regards, alux
On 19 Mai, 14:33, Adrian Cuthbertson <[email protected]> wrote: > > thanks for the hint. I looked into clojure.core and similar files, > > and didnt find much use of *err*. > > There are a few in clojure.contrib. Have a look at logging.clj, > repl_ln.clj, server_socket.clj, internal.clj and utilities.clj. > > (doc *in*) > ------------------------- > clojure.core/*in* > A java.io.Reader object representing standard input for read operations. > Defaults to System/in, wrapped in a LineNumberingPushbackReader > > (doc *out*) > ------------------------- > clojure.core/*out* > A java.io.Writer object representing standard output for print operations. > Defaults to System/out > > (doc *err*) > ------------------------- > clojure.core/*err* > A java.io.Writer object representing standard error for print operations. > Defaults to System/err, wrapped in a PrintWriter > > Basically, by convention when a library function encounters an error > it will write error messages to the default error stream, i.e > System/err (which is normally just the console), but if you wanted to > "capture" that output and write it to a file say, then you could > rebind *err* to your own Writer before calling the library routine, > e.g > > (with-open [wtr (java.io.PrintWriter. > (java.io.FileOutputStream. > (java.io.File. "test.errors")))] > (binding [*err* wtr] > ; here you call the library, but I'll just... > (.println *err* "foo-error"))) > > Then test.errors would contain > foo-error > > Hth. > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to [email protected] > Note that posts from new members are moderated - please be patient with your > first post. > To unsubscribe from this group, send email to > [email protected] > For more options, visit this group > athttp://groups.google.com/group/clojure?hl=en -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to [email protected] Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/clojure?hl=en
