B4A Library [B4X] QRGenerator - Cross platform QR code generator

QRGenerator is a class that generates QR codes.
It is written in B4X and it is compatible with B4A, B4i and B4J.

iPhone default camera app recognizing the QR code displayed in a B4A app:

Can create codes made of up to 2953 bytes.

It depends on XUI library and B4XCollections v1.50+.
It uses the very useful B4XBytesBuilder class.

Very good resource about the format: https://www.thonky.com/qr-code-tutorial/introduction
The Reed-Solomon error correction calculation is based on zxing open source project.

A B4J example is attached with QRGenerator class.

Versions

V1.60 - Added support for 1-L (max size is 17 bytes).
V1.50 - Added support for 40-L, 40-H and 23-H formats. Refactored code to make it easier to add more formats. BytesBuilder was replaced with B4XBytesBuilder from B4XCollections library.
V1.20 - Adds support for 9-L codes. Also renamed the local Block variable as it is a reserved word in B4i.
v1.11 - Fixes an issue with messages 35 or 36 bytes long.

Extended version that supports more QR versions: https://www.b4x.com/android/forum/t...-to-accommodate-more-qr-code-versions.116891/

 

[Alexander Stolte]

What would be the best way to print the generated code to a network printer?

Please start a new thread for this question.

 

[Erel]

Thread locked. Please feel free to ask any question you have in the questions forum.

 

[Erel]

Version 1.11 released. Fixes a bug with the max size of 4-H codes.

 

[Erel]

V1.20 released. Supports messages of up to 230 bytes.

 

[Erel]

V1.50 - Added support for 40-L, 40-H and 23-H formats. Refactored code to make it easier to add more formats. BytesBuilder was replaced with B4XBytesBuilder from B4XCollections library.

 

[Erel]

V1.60 - Added support for 1-L (max size is 17 bytes).

I've used @Johan Schoeman useful tool: https://www.b4x.com/android/forum/threads/qr-code-how-to-construct-a-generator-polynomial.43290/ to find the polynomial factors.