VB.NET Requires Chilkat v11.7.0+

Create a Wi-Fi QR Code

Demonstrates a QR code that joins a phone to a Wi-Fi network when scanned. A QR code only holds text. Phones recognize text of the form WIFI:T:;S:;P:;; and offer to join the network. T is WPA (also used for WPA2 and WPA3), WEP, or nopass for an open network, and H:true can be added for a hidden network. In the name and the password, the characters backslash, semicolon, comma, colon and double quote must each be preceded by a backslash.

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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","WIFI:T:WPA;S:Chilkat Guest;P:correct-horse-battery-staple;;")

'  Level Q, so that the code still scans when it is printed small or gets worn.
json.UpdateString("encoding.qr.errorCorrection","Q")
json.UpdateInt("render.moduleSize",8)

'  Say which network it is under the code.
json.UpdateBool("render.text.enabled",True)
json.UpdateString("render.text.value","Wi-Fi: Chilkat Guest")
json.UpdateInt("render.text.scale",2)

json.UpdateString("output.path","qa_output/qr_wifi.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.QrCode("generate",json,jsonOut)
If (success = False) Then
    Debug.WriteLine(fmt.LastErrorText)
    Exit Sub
End If


Debug.WriteLine("file: " & jsonOut.StringOf("outputs[0].path"))
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_wifi.png:

'  

'  Sample output:

'  file: qa_output/qr_wifi.png
'  QR version: 5
'  image: 360 x 374 pixels