Question 76086 in Flutter Question posted in
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Is there a way to override the qrcode after it is scanned once? – Flutter

I have generated a QrCode from flutter using "qr_flutter: 4.0.0" and I am scanning it from a different app using "mobile_scanner: ^3.0.0". What I want here is that after I scan the QR I don’t it to be scanable again. It should Simply show the details of the QR and also say that it is redeemed.

Please let me know if there is a solution for this. Thanks!

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2

Answers


  1. 0

    A "QR Code" is not a magical thing, it’s just data serialization.

    So if for example the data in your QR code is "www.webshop.example.com/coupon/123" then you cannot change that. That is the data. Just imagine you printed it in a magazine or hung it in a window.

    What you can do is have a database of your coupons, where you can add as much details to "123" as you want, any time you want.

    For example, you could have a list of users that has already redeemed it. Then when a user uses the URL/coupon code "123" you can decide, has this user used it before, then show "already used", else give 10% off. Or anything else you want.

    So to summarize: you cannot change the QR code, you can change the data attached to it in your database to do anything you want to do.

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  2. 0

    Is your data that generated into QR stored in any database? If data stored the answer is yes. You can generate single use QR codes.

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