How to decode 2d data matrix barcode in HTML/Javascipt (Android)?

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Context: I need to scan a data matrix barcode with the camera of my android mobile phone. I access the camera over html5 and got the picture into a canvas element.

Approach: I can't find a javascript library for scanning a picture to decode a 2D data matrix code. Actually i call the ZXing App and copy and go backt etc. So i'm not happy with this laborious solution.

Question: Somebody knows a javascript library for decoding 2D data matrix codes? Or maybe an easy solution by using another app like ZXing / Goggles and get the result of the scan automatically back in JS?!

I'd appreciate your input.

Posted 29-Sep-14 1:04am

tvelop

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Sergey Alexandrovich Kryukov 29-Sep-14 11:41am

Why Javascript? Any legitimate reason to do so?
Also, there are different barcode standards; not all libraries support them all. Which one is yours?
—SA

tvelop 29-Sep-14 12:00pm

Cause it's a web application which supports offline functionality, used by android-based mobile devices.

Sergey Alexandrovich Kryukov 29-Sep-14 12:26pm

It does not answer to this concern... For example, you could have Java application communicating with the Web application, something else...
And what is the barcode standard to be used?
—SA

tvelop 29-Sep-14 12:44pm

Hm okay, i thought JS is the only option here. I'm curious and happy with any other solutions to fix this! At the end my offline web application should be able to scan this barcode using the camera and save the result in my local storage or indexeddb. How do i achieve this?
What do you mean with "barcode standard"? DataMatrix ECC200?

Sergey Alexandrovich Kryukov 29-Sep-14 13:10pm

I think the problem is a bit too hard for Javascript, then you cannot find the solution. It's easier to find for Java. You did not explain why "JS is the only option".
—SA

tvelop 29-Sep-14 15:06pm

JS isn't the only option. But i want to extend my already existing web application by this function. Field worker should easily scan a barcode with their android smartphone. They press the button in the web app and take a picture or scan directly and will get the result string back to save it over JS. It doesn't matter how its happen, important is that it's userfriendly and you don't have to copy the result by yourself etc. So how i can do the job with java in android?

Sergey Alexandrovich Kryukov 29-Sep-14 15:25pm

I perfectly understand the need. Probably the service need the data to be sent, not an image. So you have to recognize it in your smartphone. Good idea, sure.

Thank about doing it as a Java application instead of Web browser. I understand that the service may not provide the Java API. But even without that, you can fully mimic the behavior of the browser, by directly sending some HTTP request to the service and processing HTTP response. It will open the opportunity to use some Java library for ECC200 recognition.

So, how about writing it in Java? Or C/C++?

—SA

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Sergey Alexandrovich Kryukov · Answer 1 · 2014-09-29T09:33:00

Solution 1

Please see my comments to the question, the part where I advise to use Java, C or C++. Then you would be able to find an open-source library.

With C/C++, you can use this open-source library: http://www.libdmtx.org[^].

You can try to find some more: http://bit.ly/1pmrWZ3[^].

Many products are commercial, but try to spot something of open-source.

—SA

Posted 29-Sep-14 9:33am

Sergey Alexandrovich Kryukov

Comments

tvelop 30-Sep-14 3:55am

Thanks for your advise! I can write a separate application for the scan/decoding part, but i can't rewrite the web application as a Java/C application. Maybe you know a comfortable solution to get back the result from the app to my web app? Maybe by using a service, public method or shareable folder?

Sergey Alexandrovich Kryukov 30-Sep-14 11:05am

I advised to use C/C++ or Java application only on the client side.
—SA