Go Requires Chilkat v11.7.0+

QR Code Numeric, Alphanumeric and Byte Modes

See more QR Code Examples

Demonstrates the QR encoding modes. Digits alone are stored in numeric mode, and text made only of digits, upper-case letters, space and $ % * + - . / : in alphanumeric mode. Both pack more characters into a symbol than byte mode, which is used for everything else. QrCode chooses the most compact mode the text allows, and the response reports it. A product code written in upper case therefore gives a smaller symbol than the same code in lower case. Go

    success := false

    //  This example requires the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    fmt := chilkat.NewFormats()
    json := chilkat.NewJsonObject()
    jsonOut := chilkat.NewJsonObject()

    //  Digits only.
    json.UpdateString("payload.text","00123456789012345678")
    success = fmt.QrCode("generate",json,jsonOut)
    if success == false {
        fmt.Println(fmt.LastErrorText())
        fmt.DisposeFormats()
        json.DisposeJsonObject()
        jsonOut.DisposeJsonObject()
        return
    }

    fmt.Println("digits: mode ", *jsonOut.StringOf("symbols[0].selectedEncoding.mode"), ", version ", jsonOut.IntOf("symbols[0].selectedEncoding.version"))

    //  Upper-case letters, digits, space and - are all in the alphanumeric set.
    json.UpdateString("payload.text","ORDER-12345 LOT A7 SHELF 12-C")
    success = fmt.QrCode("generate",json,jsonOut)
    if success == false {
        fmt.Println(fmt.LastErrorText())
        fmt.DisposeFormats()
        json.DisposeJsonObject()
        jsonOut.DisposeJsonObject()
        return
    }

    fmt.Println("upper case: mode ", *jsonOut.StringOf("symbols[0].selectedEncoding.mode"), ", version ", jsonOut.IntOf("symbols[0].selectedEncoding.version"))

    //  Lower-case letters are not, so the same text in lower case needs byte mode.
    json.UpdateString("payload.text","order-12345 lot a7 shelf 12-c")
    success = fmt.QrCode("generate",json,jsonOut)
    if success == false {
        fmt.Println(fmt.LastErrorText())
        fmt.DisposeFormats()
        json.DisposeJsonObject()
        jsonOut.DisposeJsonObject()
        return
    }

    fmt.Println("lower case: mode ", *jsonOut.StringOf("symbols[0].selectedEncoding.mode"), ", version ", jsonOut.IntOf("symbols[0].selectedEncoding.version"))

    //  The mode can be named.  Byte mode can hold any text.  Naming a mode the text cannot use
    //  (numeric for text with letters, for example) fails with conflictingOptions.
    json.UpdateString("payload.text","00123456789012345678")
    json.UpdateString("encoding.qr.mode","byte")
    success = fmt.QrCode("generate",json,jsonOut)
    if success == false {
        fmt.Println(fmt.LastErrorText())
        fmt.DisposeFormats()
        json.DisposeJsonObject()
        jsonOut.DisposeJsonObject()
        return
    }

    fmt.Println("digits as bytes: mode ", *jsonOut.StringOf("symbols[0].selectedEncoding.mode"), ", version ", jsonOut.IntOf("symbols[0].selectedEncoding.version"))

    //  The four symbols, in the order they were made:

    //  

    //  Sample output:

    //  digits: mode numeric, version 1
    //  upper case: mode alphanumeric, version 2
    //  lower case: mode byte, version 3
    //  digits as bytes: mode byte, version 2

    fmt.DisposeFormats()
    json.DisposeJsonObject()
    jsonOut.DisposeJsonObject()