How to draw a QR code with QML in native C++

Question

I want to generate the Qr code in QML in QT creator v5.7 so can you please help me to which qr library i will use and how to implement qr code.

The other question is about doing that with QWidgets, this one is about doing it in QML. — GrecKo, Feb 28 '18 at 11:15
Ok, so the question boils down to: https://stackoverflow.com/questions/33422265/pass-qimage-to-qml — p-a-o-l-o, Feb 28 '18 at 11:32

score 4 · Answer 1 · answered Feb 28 '18 at 11:57

4

A solution would be to use the QZXing library: https://github.com/ftylitak/qzxing#howToEncodingQtQuick

The sample usage is quite simple:
Include the library in your project and then in you QML code you can do :

import QZXing 2.3

Image{
    source: "image://QZXing/encode/" + textToBeEncoded
}

If you want to understand how it works under the hood, this library is a wrapper around the famous zxing library and it exposes a QQuickImageProvider that can be invoked from QML with the image url : image://QZXing/....

This image provider takes the text to be encoded and pass it to a c++ function generating a QImage from the data and returns this QImage to the qml engine that will display it.

answered Feb 28 '18 at 11:57

GrecKo

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This is to decode the QR by providing image to QR. – Mohammad Kanan Feb 28 '18 at 12:32
@MohammadKanan no – GrecKo Feb 28 '18 at 12:36
ah ok, I missed the second paragraph – Mohammad Kanan Feb 28 '18 at 12:51
Check this https://github.com/ftylitak/qzxing#how-to-include and if you have further problems open an issue on the github project. – GrecKo Feb 28 '18 at 15:23
@TM9412, there few examples in the repository ready for use, did you try one of them – Mohammad Kanan Feb 28 '18 at 17:52

How to draw a QR code with QML in native C++

1 Answers1