Go Requires Chilkat v11.7.0+

Embed a QR Code in HTML as a Data URI

See more QR Code Examples

Demonstrates putting a QR code directly into an HTML page or HTML email with no separate image file. The base64 PNG returned by QrCode becomes the src of an img tag as a data URI, which is the MIME type from outputs[0].mimeType followed by the base64 from outputs[0].base64. Go

    success := false

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

    json := chilkat.NewJsonObject()
    json.UpdateString("payload.text","https://www.chilkatsoft.com/")
    json.UpdateInt("render.moduleSize",5)

    fmt := chilkat.NewFormats()
    jsonOut := chilkat.NewJsonObject()
    success = fmt.QrCode("generate",json,jsonOut)
    if success == false {
        fmt.Println(fmt.LastErrorText())
        json.DisposeJsonObject()
        fmt.DisposeFormats()
        jsonOut.DisposeJsonObject()
        return
    }

    //  A data URI has the form  data:<MIME type>;base64,<base64 data>
    sbHtml := chilkat.NewStringBuilder()
    sbHtml.Append("<html><body><p>Scan to visit chilkatsoft.com</p><img alt=\"QR code\" width=\"")
    sbHtml.AppendInt(*jsonOut.IntOf("outputs[0].width"))
    sbHtml.Append("\" height=\"")
    sbHtml.AppendInt(*jsonOut.IntOf("outputs[0].height"))
    sbHtml.Append("\" src=\"data:")
    sbHtml.Append(*jsonOut.StringOf("outputs[0].mimeType"))
    sbHtml.Append(";base64,")
    sbHtml.Append(*jsonOut.StringOf("outputs[0].base64"))
    sbHtml.Append("\"></body></html>")

    success = sbHtml.WriteFile("qa_output/qr_page.html","utf-8",false)
    if success == false {
        fmt.Println(sbHtml.LastErrorText())
        json.DisposeJsonObject()
        fmt.DisposeFormats()
        jsonOut.DisposeJsonObject()
        sbHtml.DisposeStringBuilder()
        return
    }

    fmt.Println("image: ", jsonOut.IntOf("outputs[0].width"), " x ", jsonOut.IntOf("outputs[0].height"), " pixels")
    fmt.Println("HTML length: ", sbHtml.Length())

    //  The page, as a browser shows it:

    //  

    //  Sample output:

    //  image: 185 x 185 pixels
    //  HTML length: 1211

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