B4X 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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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("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 ChilkatFormats
fmt.Initialize
Dim jsonOut As ChilkatJsonObject
jsonOut.Initialize
success = fmt.QrCode("generate", json, jsonOut)
If success = False Then
    Log(fmt.LastErrorText)
    Return
End If


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

'  

'  Sample output:

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