VB.NET Requires Chilkat v11.7.0+

Choose the QR Code Version and Mask Pattern

See more QR Code Examples

Demonstrates fixing the QR version and the mask pattern. The version (1 to 40) is the size of the symbol: version 1 is 21 modules wide and each version adds 4. By default QrCode picks the smallest version that holds the data and the mask pattern that scores best under the QR standard. Fixing the version is useful when a series of codes must all be the same size, and minVersion and maxVersion bound the automatic choice instead. 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 fmt As New Chilkat.Formats
Dim json As New Chilkat.JsonObject
Dim jsonOut As New Chilkat.JsonObject
json.UpdateString("payload.text","https://www.chilkatsoft.com/")

'  Automatic: the smallest version that holds the text, and the best-scoring mask.
success = fmt.QrCode("generate",json,jsonOut)
If (success = False) Then
    Debug.WriteLine(fmt.LastErrorText)
    Exit Sub
End If

Debug.WriteLine("automatic: version " & jsonOut.IntOf("symbols[0].selectedEncoding.version") & ", " & jsonOut.IntOf("symbols[0].dimensions.modulesWide") & " modules wide, mask " _
     & jsonOut.IntOf("symbols[0].selectedEncoding.mask"))

'  A fixed version.  The call fails with capacityExceeded if the text does not fit it.
json.UpdateInt("encoding.qr.version",8)
success = fmt.QrCode("generate",json,jsonOut)
If (success = False) Then
    Debug.WriteLine(fmt.LastErrorText)
    Exit Sub
End If

Debug.WriteLine("version 8: version " & jsonOut.IntOf("symbols[0].selectedEncoding.version") & ", " & jsonOut.IntOf("symbols[0].dimensions.modulesWide") & " modules wide, mask " _
     & jsonOut.IntOf("symbols[0].selectedEncoding.mask"))

'  A fixed mask pattern, 0 to 7.  Every mask gives a valid symbol holding the same data.
json.UpdateInt("encoding.qr.mask",5)
success = fmt.QrCode("generate",json,jsonOut)
If (success = False) Then
    Debug.WriteLine(fmt.LastErrorText)
    Exit Sub
End If

Debug.WriteLine("version 8, mask 5: version " & jsonOut.IntOf("symbols[0].selectedEncoding.version") & ", mask " & jsonOut.IntOf("symbols[0].selectedEncoding.mask"))

'  Bounds for the automatic choice: no smaller than version 4, no larger than version 10.
Dim json2 As New Chilkat.JsonObject
json2.UpdateString("payload.text","https://www.chilkatsoft.com/")
json2.UpdateInt("encoding.qr.minVersion",4)
json2.UpdateInt("encoding.qr.maxVersion",10)
success = fmt.QrCode("generate",json2,jsonOut)
If (success = False) Then
    Debug.WriteLine(fmt.LastErrorText)
    Exit Sub
End If

Debug.WriteLine("minVersion 4: version " & jsonOut.IntOf("symbols[0].selectedEncoding.version"))

'  The four symbols, in the order they were made.  The second and the third hold the same data
'  in the same version and differ only in the mask:

'  

'  Sample output:

'  automatic: version 3, 29 modules wide, mask 2
'  version 8: version 8, 49 modules wide, mask 2
'  version 8, mask 5: version 8, mask 5
'  minVersion 4: version 4