Visual FoxPro 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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LOCAL lnSuccess
LOCAL loJson
LOCAL loFmt
LOCAL loJsonOut

lnSuccess = 0

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

loJson = CreateObject('Chilkat.JsonObject')
loJson.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.
loJson.UpdateString("encoding.qr.errorCorrection","Q")
loJson.UpdateInt("render.moduleSize",8)

*  Say which network it is under the code.
loJson.UpdateBool("render.text.enabled",1)
loJson.UpdateString("render.text.value","Wi-Fi: Chilkat Guest")
loJson.UpdateInt("render.text.scale",2)

loJson.UpdateString("output.path","qa_output/qr_wifi.png")
loJson.UpdateBool("output.overwrite",1)
loJson.UpdateString("output.return","none")

loFmt = CreateObject('Chilkat.Formats')
loJsonOut = CreateObject('Chilkat.JsonObject')
lnSuccess = loFmt.QrCode("generate",loJson,loJsonOut)
IF (lnSuccess = 0) THEN
    ? loFmt.LastErrorText
    RELEASE loJson
    RELEASE loFmt
    RELEASE loJsonOut
    CANCEL
ENDIF

? "file: " + loJsonOut.StringOf("outputs[0].path")
? "QR version: " + STR(loJsonOut.IntOf("symbols[0].selectedEncoding.version"))
? "image: " + STR(loJsonOut.IntOf("outputs[0].width")) + " x " + STR(loJsonOut.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

RELEASE loJson
RELEASE loFmt
RELEASE loJsonOut