Unbound value File.make_blob

Learning
1

I am running into another silly error. I can not figure out what I am doing wrong.

Here is a Minimal Failure Case:

open Js_of_ocaml

let _ = File.make_blob ""

Error:

File "Code.ml", line 3, characters 8-22:
3 | let _ = File.make_blob ""
            ^^^^^^^^^^^^^^
Error: Unbound value File.make_blob

Dune:

(library
 (name f_msg)
 (inline_tests)
 (libraries core_kernel js_of_ocaml js_of_ocaml-lwt)
 (preprocess
  (pps ppx_jane ppx_blob ppx_inline_test ppx_assert js_of_ocaml-ppx)))

opam list shows 5.2.0 installed

What am I doing wrong ?

Location of function: js_of_ocaml/file.mli at master · ocsigen/js_of_ocaml · GitHub

2

File.make_blob is a type constructor, not a value.

Cheers,
Nicolas

1 Like
3

Followup:

Minimal error code:

open Js_of_ocaml

let _ = Dom_html._URL##.createObjectURL ""

Error:

3 | let _ = Dom_html._URL##.createObjectURL "" 
            ^^^^^^^^^^^^^
Error: Unbound value Dom_html._URL

The coded I want to call looks like:

class type _URL =
  object
    method createObjectURL : #File.blob t -> js_string t meth

    method revokeObjectURL : js_string t -> unit meth
  end

This is in file dom_html.ml, thus module name Dom_html.
Class name _URL. What am I doing wrong ?

4

_URL is not a class, it is a class type. In any case, it is not a value. I suggest you read OCaml - Objects in OCaml to learn the basics of objects in OCaml.

Cheers,
Nicolas

1 Like
5

Found the solution:

let _ : Dom_html._URL Js.t = Dom_html.window##._URL ;