VB.NET 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. VB.NET

Dim success As Boolean = False

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

Dim json As New Chilkat.JsonObject
json.UpdateString("payload.text","https://www.chilkatsoft.com/")
json.UpdateInt("render.moduleSize",5)

Dim fmt As New Chilkat.Formats
Dim jsonOut As New Chilkat.JsonObject
success = fmt.QrCode("generate",json,jsonOut)
If (success = False) Then
    Debug.WriteLine(fmt.LastErrorText)
    Exit Sub
End If


'  A data URI has the form  data:<MIME type>;base64,<base64 data>
Dim sbHtml As New Chilkat.StringBuilder
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) Then
    Debug.WriteLine(sbHtml.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("image: " & jsonOut.IntOf("outputs[0].width") & " x " & jsonOut.IntOf("outputs[0].height") & " pixels")
Debug.WriteLine("HTML length: " & sbHtml.Length)

'  The page, as a browser shows it:

'  

'  Sample output:

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