QR Code Generator for Go

MIT License

Installation

go get -u github.com/grkuntzmd/qrcodegen

This package provides a QR Code generator that supports most of ISO/IEC 18004:2006. It is based on Nayuki and is released under the Apache-2 license.

Usage

Simple example

import "github.com/grkuntzmd/qrcodegen"

qrCode := EncodeText("Hello, World!", Medium) // Second parameter is the error correction level (Low, Medium, Quartile, High).
svg := qrCode.ToSVGString(2, false)           // First parameter is the border width in "modules" and the second is true if you
											  // want a "DOCTYPE" line included.

More complex example

import "github.com/grkuntzmd/qrcodegen"

segs := []*QRSegment{
	MakeAlphanumeric("SUDOKU://"),
	MakeNumeric("007020004930000600600300000000000050200010008006900400003700900020050001000008000"),
}
qrCode, err := EncodeSegments(segs, Low, WithAutoMask())
if err != nil {
	// Handle this.
}
svg := qrCode.ToSVGString(4, true)

If you want to produce an image instead of SVG, you can access the fields in the QRCode structure directly to get the size and which modules should be black:

type QRCode struct {
	Version                         // The QR code version, a number in the range [1, 40].
	Size                 int        // The width and height of the square QR code symbol as measured in "modules"
	ErrorCorrectionLevel ECL        // The error correction level used in this QR code (Low, Medium, Quartile, or High).
	Mask                            // The type of mask [0, 7] used in this QR code.
	Modules              [][]Module // The modules ("pixels") that make up this QR code (black = 1, white = 0)
	// Other fields are private.
}

The Modules field, indexed by row and column, is 1 if the pixels should be black and 0 if white.