I have the following code (very simple) for writing some binary data
to a file
(def ^{:dynamic true} *out*)
;; writers
(defmulti write-a
(fn [spec val]
(cond
(keyword? spec) spec)))
(defmethod write-a :byte [_ val]
(.writeByte *out* (int val)))
And this code to write to the dynamic *out* binding
(defn id3-encode
([] (id3-encode test-out))
([file]
(with-open [out (-> (File. file) (FileOutputStream.)
(BufferedOutputStream.) (DataOutputStream.))]
(binding [*out* out]
(map #(write-a :byte %) [\I \D \3])))))
When i run the id3-encode function I get this exception:
user=> (fixlkg.fix/id3-encode)
(user=> IllegalArgumentException No matching method found: writeByte
for class clojure.lang.Var$Unbound
clojure.lang.Reflector.invokeMatchingMethod (Reflector.java:52)
Could somebody help explain why this is happening. It appears to be
because of either the map or the anonymous function. Because if I
change the function to just iteratively call (write-a :byte \I) (write-
a :byte \D) etc it works fine.
Thanks,
matthew
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