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BARCODE READER SDK DEMO

Explore the flexibe barcode reading settings to optimize for your specific usage scenario.

WEB TWAIN SDK DEMO

Try the most popular web scanner features: scan images, import local images and PDF files, edit, save to local, upload to database, and etc.

BARCODE READER JAVASCRIPT DEMO

Transform any camera-equipped devices into real-time, browser-based barcode and QR code scanners.

MRZ SCANNER WEB DEMO

Detects the machine-readable zone of a passport, scans the text, and parses into human-readable data.

APP STORE DEMOS

BARCODE READER SDK FOR IOS

BARCODE READER SDK FOR ANDROID

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Table of contents

Error Troubleshooting

XMLHttpRequest cannot load XXX

Symptom

You get the error

XMLHttpRequest cannot load xxxxx. No 'Access-Control-Allow-Origin' header is present on the requested resource. Origin 'http://xxxxxxx' is therefore not allowed access.

Cause

You are uploading or downloading to/from a web server which is in a different domain than your current website and that web server doesn’t allow accessing from a different domain.

Solution

Try uploading to the same domain or update the server side configuration to allow cross domain requests. If you are using IIS, you can refer to the following configuration.

<system.webServer>
    <httpProtocol>
            <customHeaders>
            <add name="Access-Control-Allow-Origin" value="*" />
            <add name="Access-Control-Allow-Methods" value="OPTIONS, POST, GET, PUT" />
            <add name="Access-Control-Allow-Headers" value="x-requested-with" />
            <add name="Access-Control-Allow-Credentials" value="true" />
        </customHeaders>
    </httpProtocol>
</system.webServer>

Note

After updating the server configuration file, you’ll need to restart the server (i.e. IIS).

If you are downloading a file, you might need to clear the browser cache because a cached file will not be requested again from the server, thus still no ‘Access-Control-Allow-Origin’ header will be presented.

If you are using Windows Authentication, you may need to change the default setting of withCredentials in the dynamsoft.webtwain.initiate.js file. To do that, open the JS file, find withCredentials:false and change it to withCredentials:true .

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