How to create a vector of bytes from pdf file with ClojureScript?

Question

I want to convert a pdf file to a vector of bytes like: [1 23 4 43 .....], using ClojureScript. Please, any ideas?

Thanks a lot!

Answer 1

I wrote this quick example that should get you most of what you need for a web version with the HTML5 Files API:

(defn handle-files [fs]
  (let [file  (aget (.-files fs) 0) ;; the first file
        slice (.slice file 0 100)]  ;; a slice with the first 100 bytes

    ;; The API to get the file contents returns a promise, so we'll update
    ;; the atom when the data is available
    (-> slice .text (.then #(swap! file-info assoc-in [:contents] %)))

    ;; Most of the file info is available right away
    (reset! file-info {:name (.-name file)
                       :size (.-size file)
                       :type (.-type file)})))

;; App initialization

(defn mount-root []
  (rdom/render [example-app] (.getElementById js/document "app"))

  ;; register fn to check on the file[s] we want the browser to scan
  (-> (.getElementById js/document "input")
      (.addEventListener "change" #(handle-files (.-target %)) false)))

You can find a working example on this repo: https://github.com/dfuenzalida/cljs-files-api