Visual Basic 6.0 Requires Chilkat v11.7.0+

Generate a QR Code PNG in Memory

See more QR Code Examples

Demonstrates getting a QR code image without writing a file. With no output options the result is a PNG returned as base64 in outputs[0].base64 of the response. The example decodes it into a BinData, which holds the bytes of the PNG to send in an HTTP response, store in a database, attach to an email, or save. Visual Basic 6.0

Dim success As Long
success = 0

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

Dim json As New ChilkatJsonObject
success = json.UpdateString("payload.text","https://www.chilkatsoft.com/")
success = json.UpdateInt("render.moduleSize",6)

Dim fmt As New ChilkatFormats
Dim jsonOut As New ChilkatJsonObject
success = fmt.QrCode("generate",json,jsonOut)
If (success = 0) Then
    Debug.Print fmt.LastErrorText
    Exit Sub
End If

Debug.Print "format: " & jsonOut.StringOf("outputs[0].format")
Debug.Print "MIME type: " & jsonOut.StringOf("outputs[0].mimeType")
Debug.Print "image: " & jsonOut.IntOf("outputs[0].width") & " x " & jsonOut.IntOf("outputs[0].height") & " pixels"

'  outputs[0].base64 is the PNG file, base64 encoded.
Dim bdPng As New ChilkatBinData
success = bdPng.AppendEncoded(jsonOut.StringOf("outputs[0].base64"),"base64")
If (success = 0) Then
    Debug.Print bdPng.LastErrorText
    Exit Sub
End If

Debug.Print "PNG bytes: " & bdPng.NumBytes

'  The BinData holds the image.  Here it is simply saved.
success = bdPng.WriteFile("qa_output/qr_in_memory.png")
If (success = 0) Then
    Debug.Print bdPng.LastErrorText
    Exit Sub
End If

'  The PNG held in bdPng:

'  

'  Sample output:

'  format: png
'  MIME type: image/png
'  image: 222 x 222 pixels
'  PNG bytes: 877