The QRCode Generator, Micro QRCode Generator, QRCode Decoder, Micro QRCode Decoder application.

According to ISO/IEC 18004-2015 Standard

go get -u github.com/KangSpace/gqrcode

Dependencies Package:

1. imaging

go get -u github.com/disintegration/imaging

2. image

mkdir $GOPATH/golang.org/x/
cd $GOPATH/golang.org/x/
git clone https://github.com/golang/image.git

3. text

cd $GOPATH/golang.org/x/
git clone https://github.com/golang/text.git

QRCode supports 4 character modes, and 40 versions with 4 Error correction levels.

Micro QRCode supports 4 character modes, and 4 versions with 4 Error correction levels.

4 Modes:

• numeric
  characters(10): 0 - 9

  maximum characters in Version 40-L: 7089 characters.

• alphanumeric
  characters(45): 0 - 9, A - Z, SP, $, %, *, +, -, ., /, :

  maximum characters in Version 40-L: 4296 characters.

  Alphanumeric mode is not available in Version M1 Micro QR Code Symbol

• byte
  8-bit characters.

  maximum characters in Version 40-L: 2953 characters.

  Byte mode is not available in Version M1 or M2 Micro QR Code Symbol.

• kanji
  Kanji characters in accordance with the Shift JIS system based on JIS X 0209. Only use for double-byte characters, Range are: \x8140-\x9FFC and \xE040-\xEBBF.

  maximum characters in Version 40-L: 2953 characters.

  Kanji mode is not available in Version M1 Or M2 Micro QR Code Symbol.

4 Error correction level:
Four levels of Reed-Solomon error correction(referred to as L, M, Q and H in increasing order of capacity) allowing recover of:

• L 7%
• M 15%
• Q 25%
• H 30%

  Micro QR Code is not support H level.

    // create a numeric qrcode
    data := "0123456"
    qrcode, err := NewQRCode(data)   
    outFileName := "/opt/temp/numeric.png"
    if err == nil{
        // set color for qrcode
        // out := output.NewOutput(&output.BaseOutput{Type: output.PNG, Size: 400, CodeColor: output.ColorfulCodeColor})
        out := output.NewPNGOutput0()
        qrcode.Encode(out,outFileName)
    }
    
    // create a numeric micro qrcode
    micQrcode, err := NewMicroQRCode(data)   
    outFileName2 := "/opt/temp/numeric_micro.png"
    if err == nil{
        out2 := output.NewPNGOutput0()
        micQrcode.Encode(out2,outFileName2)
    }

• NewQRCode(content string) (*mode.QRCodeStruct,error)

  Create a new QRCode(Model2) by input data.
  There will be auto-detected the Version, Error Correction Level, and without Quiet Zone.

  e.g.:
  

• NewQRCodeAutoQuiet(content string) (*mode.QRCodeStruct,error)

  Create a new QRCode(Model2) by input data with auto-size Quiet Zone, default is 4x modules per side.

  e.g.:
  

  QRCode with color:

  

• NewMicroQRCode(content string) (*mode.QRCodeStruct,error)

  Create a new Micro QRCode by input data.

  e.g.:
  

• NewMicroQRCodeAutoQuiet(content string) (*mode.QRCodeStruct,error)

  Create a new Micro QRCode by input data with auto-size Quiet Zone, default is 2x modules per side.

  e.g.:
  

• NewQRCode0(content string,format cons.Format,ec *mode.ErrorCorrection,m mode.Mode,quietZone *model.QuietZone) (qr *mode.QRCodeStruct,err error)

  Create a new QRCode by input data with full parameters.

  Params:

  Parameter	Type	Values	Comments
  content	string	numeric,alphanumeric,and other strings	-
  format	cons.Format	cons.QRCODE,cons.QrcodeModel2,cons.MicroQrcode	cons.QRCODE same with cons.QrcodeModel2
  ec	*mode.ErrorCorrection	NewErrorCorrection(level)	level in (cons.L,cons.M,cons.Q,cons.H)
  m	mode.Mode	NewNumericMode(),NewAlphanumericMode(),NewKanjiModeMode(), NewByteModeMode()	-
  quietZone	*model.QuietZone	model.AutoQuietZone,model.NoneQuietZone,NewQuietZone(size int)	-

   out := output.NewPNGOutput0()
   qrcode.Encode(out,outFileName)

• (qr *QRCodeStruct) Encode(out output.Output,fileName string) (err error)

  Encode the QRCode/Micro QRCode to the specified file and output.

• (qr *QRCodeStruct) EncodeToBase64(out output.Output) (base64Str string,err error)

  Encode the QRCode/Micro QRCode to Base64 URL String(like data:image/png,base64,xxxx) and output.

Encode Params:

output.ImageOutput implements output.Output interface to output PNG,JPG,GIF image.

    out := output.NewPNGOutput(100)
    out = output.NewPNGOutput0()
  
    logoImageFilePath := "logo.png"
    // add logo image into QRCode
    out.AddOption(output.LogoOption(logoImageFilePath))

Output Params:

All QRCode test in qrcode_test.go and micro_qrcode_test.go files.

附录：

1. Best size of QR code of each version. (1 point by 4 pixels!)