VB.NET Requires Chilkat v11.7.0+

Generate a QR Code with the Barcode Method

See more QR Code Examples

Demonstrates the Barcode method, which is the general form of QrCode: the request names the symbology, and everything else is the same. QrCode is Barcode with the symbology already set to qr, and identical requests to the two methods give identical results. A program that will produce more than one kind of barcode can use Barcode for all of them. 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("symbology","qr")
json.UpdateString("payload.text","https://www.chilkatsoft.com/")
json.UpdateString("output.path","qa_output/qr_from_barcode.png")
json.UpdateBool("output.overwrite",True)
json.UpdateString("output.return","none")

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


Debug.WriteLine("symbology: " & jsonOut.StringOf("symbols[0].symbology"))
Debug.WriteLine("QR version: " & jsonOut.IntOf("symbols[0].selectedEncoding.version"))
Debug.WriteLine("image: " & jsonOut.IntOf("outputs[0].width") & " x " & jsonOut.IntOf("outputs[0].height") & " pixels")

'  The image written to qa_output/qr_from_barcode.png:

'  

'  Barcode requires the symbology.  QrCode does not.
Dim json2 As New Chilkat.JsonObject
json2.UpdateString("payload.text","https://www.chilkatsoft.com/")
success = fmt.Barcode("generate",json2,jsonOut)
If (success = False) Then
    Debug.WriteLine("without a symbology: " & jsonOut.StringOf("errors[0].code") & " at " & jsonOut.StringOf("errors[0].path"))
End If


'  Sample output:

'  symbology: qr
'  QR version: 3
'  image: 148 x 148 pixels
'  without a symbology: missingOption at /symbology