qr-repa

Library to generate QR codes from bytestrings and objects and scale image files https://github.com/vmchale/QRRepa#readme

Latest on Hackage:0.1.0.0

This package is not currently in any snapshots. If you're interested in using it, we recommend adding it to Stackage Nightly. Doing so will make builds more reliable, and allow stackage.org to host generated Haddocks.

BSD3 licensed by Vanessa McHale
Maintained by tmchale@wisc.edu

QR Imager Library

This is a library to generate .png files from QR codes.

Dependencies

The library depends on the C library https://github.com/fukuchi/libqrencode which you will need to install separately.

Usage

The library exports main functions - createQRCode and byteStringToQR - and their secured/signed versions. The first takes any object that is an instance of ToJSON and writes an image to file, while the second takes a (strict) bytestring and writes it to file.

Executable

Installation

For building haskell, the best tool is currently http://haskellstack.org. Install it, and then type

stack install --install-ghc

in the appropriate directory, and it will be installed on your path.

Use

Compiling will generate an executable called QRPipe which reads from stdin and outputs a file as the second argument, e.g.

`echo 'My name is:" | qrpipe "nametag.png"`

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