B4X 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. B4X

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 ChilkatJsonObject
json.Initialize
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 ChilkatFormats
fmt.Initialize
Dim jsonOut As ChilkatJsonObject
jsonOut.Initialize
success = fmt.Barcode("generate", json, jsonOut)
If success = False Then
    Log(fmt.LastErrorText)
    Return
End If


Log("symbology: " & jsonOut.StringOf("symbols[0].symbology"))
Log("QR version: " & jsonOut.IntOf("symbols[0].selectedEncoding.version"))
Log("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 ChilkatJsonObject
json2.Initialize
json2.UpdateString("payload.text", "https://www.chilkatsoft.com/")
success = fmt.Barcode("generate", json2, jsonOut)
If success = False Then
    Log("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