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· Jan 25, 2019

TWAIN interface to Cache Application

#API #Frontend #Caché

Hello Cache Developers:  I was curious if anyone has ever created a TWAIN interface to their Cache Application?   I am new to TWAIN and hence the reason for this question.  From what I understand, TWAIN is software used by various digital imaging software and TWAIN provides an API for applications to call to be able to import images into their application.   I work with a healthcare application and was wondering what types of things are required for a Cache Web Application to call the TWAIN API to be able to load images into a Cache table.    Any input, sample code, or suggestions is appreciated.   Thanks and Have a Great Day!    Happy Coding.

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Ward De Backer · Jan 26, 2019

A quick idea: doing a search for TWAIN on the NPM repository for JavaScript & Node.js, it seems you can quite easily add the ability to scan images to any web application:

  • add the Scanner.js module to your web page
  • add the scanner.scan() method in your webpage to show a native TWAIN dialog in the user's browser
  • from the examples in their developers guide, you can then show the images in the browser & upload them to the server (this should work with any back-end which allows file uploading)
  • I would upload the images to a (protected) image directory on your webserver instead of storing them as a blob inside the CACHE.DAT - your database will grow very quickly and it becomes much more difficult to show images e.g. in a browser page

You can easily search for more TWAIN npm modules on npm - Scanner.js seems to be the most popular one these days. You don't have to re-invent the wheel, npm contains a gazillion of modules for nearly every application you can think of!

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Dmitry Maslennikov · Jan 27, 2019

Well, such an interesting topic, and also quite wide.

Ok, TWAIN, is an API for image sources, it can be scanner or photo camera. You just asking about working with TWAIN, without any explanation of how you are going to use it and what sort of devices you going to utilize.

So, I'll just share some of my experience. How I've used only scanners, different types and with different workflows.

  • Server way. One or more stream document scanner (sorry don't know right term in English). Just any scanner which can work in network and configured to place all scans to some network folder or send my emails. Before sending some documents to this scanner, the operator should stick some barcode, on the title page, or on added empty first page. On the server side, we have used ABBYY Recognition Server, which just watches some folder, and can decode barcode and recognize text in the document, pack it in XML and place it in another folder. This folder was watched by Ensemble, where we searched for barcode in our system and placed this as an attachment to this document. With recognized text, we also are able to search documents in our system by the content of this document.
  • Client way. The operator working with a personal scanner connected right to his machine. While our application web-based and the server is far from this scanner, we used only client resources to scan images. We used java-applet which worked directly with TWAIN sources, so operator just called some functionality right from our application after finishing the scan, it has appeared as an attachment in the document. But this case now has some issues due to limitations for JAVA plugins in modern browsers. But it is now possible to find some modern solutions which may help to get access to twain on modern browsers, you can just google it.
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