gitlab.com/pschlump/goqrcode

gogo-qrgenerate

This project was cloned because the original author seems to have abandoned it.

A fixed version based on "http://gitlab.com/pschlump/qrcode". This project did most of the original work.

Changed command line to work slightly differently.

Package goqrcode implements a QR Code encoder.

A QR Code is a matrix (two-dimensional) barcode. Arbitrary content may be encoded, with URLs being a popular choice :)

Each QR Code contains error recovery information to aid reading damaged or obscured codes. There are four levels of error recovery: Low, medium, high and highest. QR Codes with a higher recovery level are more robust to damage, at the cost of being physically larger.

Install

go get -u gitlab.com/pschlump/qrcode/...

A command-line tool qrcode will be built into $GOPATH/bin/.

Usage

import qrcode "gitlab.com/pschlump/qrcode"

• Create a PNG image:

    var png []byte
    png, err := qrcode.Encode("https://example.org", qrcode.Medium, 256)
  

• Create a PNG image and write to a file:

    err := qrcode.WriteFile("https://example.org", qrcode.Medium, 256, "qr.png")
  

• Create a PNG image with custom colors and write to file:

    err := qrcode.WriteColorFile("https://example.org", qrcode.Medium, 256, color.Black, color.White, "qr.png")
  

All examples use the qrcode.Medium error Recovery Level and create a fixed 256x256px size QR Code. The last function creates a white on black instead of black on white QR Code.

The maximum capacity of a QR Code varies according to the content encoded and the error recovery level. The maximum capacity is 2,953 bytes, 4,296 alphanumeric characters, 7,089 numeric digits, or a combination of these.

Demo Command Line Application

A command-line tool qrcode will be built into $GOPATH/bin/. In the ./qr-generate directory there is a main program that you can use.

$ cd qr-generate
$ go build
$ ./qr-generate -o sample.png "some text"

Links

• http://en.wikipedia.org/wiki/QR_code
• ISO/IEC 18004:2006 - Main QR Code specification (approx CHF 198,00)
  
• https://github.com/qpliu/qrencode-go/ - alternative Go QR encoding library based on ZXing