Library to generate QR codes from bytestrings and objects and scale image files.
Please see README.md
#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"