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I have a project running with rxing-wasm on my mac and worked fine. But when I wanted to move to windows - running the same code that works on mac - gives me this error

this is the code I was trying to run:

const ctx = canvas.getContext('2d'); if (!ctx) { throw 'no context'; } const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height); try { // @ts-ignore const luma_data = convert_js_image_to_luma(imageData.data); const hints = new DecodeHintDictionary(); hints.set_hint(DecodeHintTypes.PossibleFormats, 'UpcEanExtension'); hints.set_hint(DecodeHintTypes.TryHarder, 'true'); const result = decode_barcode_with_hints(luma_data, canvas.width, canvas.height, hints); console.warn(result.text()); } catch (e) { console.log(e); }

Currently, a new, empty HashMap is passed into the Rust library when encode_barcode is called. However for Telepen Numeric, I would need to pass a hint.

Could there either be an additional method - e.g. encode_barcode_with_hints?

@yuezk Should I move the rxing-wasm crate into the RXing org on npmjs? Thoughts?

Hi,

My knowledge of Rust and of WebAssembly internals is still pretty shallow so apologies in advance if I am missing something obvious. I am trying to use the rxing-wasm package as bundled by the wasm-pack build command described here:

https://www.furidamu.org/blog/2020/07/10/rust-webassembly-in-the-browser/

That seems to work fine and I am able to initialize the resultant WASM binary and invoke the convert_js_image_to_luma function but when I try to call decode_barcode it panics with the following error:

Uncaught RuntimeError: unreachable executed
    decode_barcode http://localhost:8080/rxing_wasm.js:187
    onload http://localhost:8080/?:43
    onclick http://localhost:8080/?:30
    main http://localhost:8080/?:24
    async* http://localhost:8080/?:54
[rxing_wasm_bg.wasm:1171526:1](http://localhost:8080/rxing_wasm_bg.wasm)
    __rust_start_panic http://localhost:8080/rxing_wasm_bg.wasm:1171526
    rust_panic http://localhost:8080/rxing_wasm_bg.wasm:1157051
    hc53aea0352e77326 http://localhost:8080/rxing_wasm_bg.wasm:1006605
    ha183a8279614f03a http://localhost:8080/rxing_wasm_bg.wasm:1062504
    hc33870f333461503 http://localhost:8080/rxing_wasm_bg.wasm:1154372
    rust_begin_unwind http://localhost:8080/rxing_wasm_bg.wasm:1116658
    hf4a9df75710ece83 http://localhost:8080/rxing_wasm_bg.wasm:1147033
    h8c0b59521a475ac0 http://localhost:8080/rxing_wasm_bg.wasm:1085500
    hac996b83e550b52f http://localhost:8080/rxing_wasm_bg.wasm:624364
    he1247e4575455453 http://localhost:8080/rxing_wasm_bg.wasm:746459
    hc2a7bc7f939092d4 http://localhost:8080/rxing_wasm_bg.wasm:882929
    hf770383115561eeb http://localhost:8080/rxing_wasm_bg.wasm:947342
    <rxing::qrcode::qr_code_reader::QRCodeReader as rxing::reader::Reader>::decode_with_hints::h004a4523f4768536 http://localhost:8080/rxing_wasm_bg.wasm:389867

I have been testing this with a PDF417 barcode image that can be successfully decoded using the rxing-cli tool. All the code in question can be found here:

https://github.com/sfomuseum/rust-rxing-wasm/blob/main/www/index.html

The image I've been testing with is here:

https://github.com/sfomuseum/rust-rxing-wasm/blob/main/images/deltabp.png

Whic was taken from here:

https://krebsonsecurity.com/2015/10/whats-in-a-boarding-pass-barcode-a-lot/

Do you have any thoughts on what might be happening here or what I am doing wrong?

I noticed that you need to convert the image to an array of 8bit luma data, or rgb before passing it to decode_barcode. why not also expose the methods that do that?
Maybe I'm wrong and you can do this in vanilla js, but I couldn't find any example that do that without installing zxing (for js).
If there are other ways to pass image from js to the decoding function without installing zxing, I will be happy to know .

Hi,

My Rust-knowledge is a little better than the last time I asked a question but it is still pretty raw so apologies if I've missed something obvious.

I have (4) barcodes all created by, and which can be decoded by, rxing-cli in the PDF-417, Aztec, DataMatrix and QR code formats. Copies of these barcodes can be found here:

https://github.com/sfomuseum/rs-rxing-wasm/tree/main/images

When I try to decode them using a rxing-wasm binary created by wasm-pack build --target web only the PDF-417 can be decoded. All the others fail with a "Not found" error. For example:

Uncaught not found [rxing_wasm.js:293:14](http://localhost:8080/rxing_wasm.js)
    decode_barcode_with_hints http://localhost:8080/rxing_wasm.js:293
    onload http://localhost:8080/:59
    (Async: EventHandlerNonNull)
    onclick http://localhost:8080/:44
    (Async: EventHandlerNonNull)
    main http://localhost:8080/:38
    AsyncFunctionNext self-hosted:810
    (Async: async)
    <anonymous> http://localhost:8080/:79

The code in question can be found here:

https://github.com/sfomuseum/rs-rxing-wasm/blob/main/www/index.html

I have spent some time poking around the rxing-cli package to see whether there are hints, or other arguments, I should be passing to the decode_barcode function but it doesn't seem like it? I get the same results if I call decode_barcode or decode_barcode_with_hints. I feel like I must be missing something obvious but I am having trouble seeing what. Do you have any ideas?

Thanks,

          looks great. tried to play with it and was going great. I do think you will need to eventually create a table that maps between properties and thier type ( and maybe even a column of an example value at the so it will be explicit) .

one last this is that with TryHarder true nad UpcEanExtension - I managed to make the browser totally freeze while trying to scan this particular image.
I will be more than happy if you could have a look why would that be .

Originally posted by @VerioN1 in #1 (comment)