Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Having troubles with ArrayBuffer #167

Open
Tadeuchi opened this issue Mar 26, 2024 · 1 comment
Open

Having troubles with ArrayBuffer #167

Tadeuchi opened this issue Mar 26, 2024 · 1 comment

Comments

@Tadeuchi
Copy link

Hi,

I'm having troubles with passing array buffer.
I followed the first example in the readme, but with additional code to handle array buffer.
And then tried doing some modifications, but... every time the results are mostly undefined...
That leads me to conclusion that I must be doing something wrong (very likely) or there may be an implementation issue?

Following code

import { getQuickJS } from "quickjs-emscripten"

async function main() {
    const QuickJS = await getQuickJS()
    const vm = QuickJS.newContext()

    const world = vm.newString("ArrayBuffer")
    const ab = new Uint8Array([1, 1])
    console.log(ab[0], ab.length)
    const ones = vm.newArrayBuffer(ab);
    vm.setProp(vm.global, "NAME", world)
    vm.setProp(vm.global, 'ones', ones)
    world.dispose()
    ones.dispose()

    const result = vm.evalCode(`"Hello " + NAME + ", why are you " + ones.length + "?"`)
    if (result.error) {
        console.log("Execution failed:", vm.dump(result.error))
        result.error.dispose()
    } else {
        console.log("Success:", vm.dump(result.value))
        result.value.dispose()
    }

    vm.dispose()
}

main().then(r => console.log('Finished'));

produces following result

1 2
Success: Hello ArrayBuffer, why are you undefined?
Finished
@flawiddsouza
Copy link

Hi, I'm also seeing the same thing. When I log the length of the arraybuffer created using vm.newArrayBuffer, it shows as undefined in the output of vm.evalCode.

It can be easily recreated in the browser like so:

<!doctype html>
<script type="module">
  import { getQuickJS } from "https://esm.sh/[email protected]"
  const QuickJS = await getQuickJS()

  const vm = QuickJS.newContext()

  const string = '12'
  const arrayBuffer = new Uint8Array([1, 2]).buffer

  console.log('string.length', string.length)
  console.log('arrayBuffer.length', arrayBuffer.byteLength)

  const vmString = vm.newString(string)
  const vmArrayBuffer = vm.newArrayBuffer(arrayBuffer)

  vm.setProp(vm.global, 'vmString', vmString)
  vm.setProp(vm.global, 'vmArrayBuffer', vmArrayBuffer)

  console.log('vmString.length', vm.dump(vm.evalCode('vmString.length').value))
  console.log('vmArrayBuffer.length', vm.dump(vm.evalCode('vmArrayBuffer.length').value))

  vmString.dispose()
  vmArrayBuffer.dispose()
  vm.dispose()
</script>

Output:

string.length 2
arrayBuffer.length 2
vmString.length 2
vmArrayBuffer.length undefined

Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees
No one assigned
Labels
None yet
Projects
None yet
Milestone
No milestone
Development

No branches or pull requests
2 participants
@Tadeuchi @flawiddsouza