Tcl 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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Tcl


load ./chilkat.dll

set success 0

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

set json [new_CkJsonObject]

CkJsonObject_UpdateString $json "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.
CkJsonObject_UpdateString $json "encoding.qr.errorCorrection" "Q"
CkJsonObject_UpdateInt $json "render.moduleSize" 8

#  Say which network it is under the code.
CkJsonObject_UpdateBool $json "render.text.enabled" 1
CkJsonObject_UpdateString $json "render.text.value" "Wi-Fi: Chilkat Guest"
CkJsonObject_UpdateInt $json "render.text.scale" 2

CkJsonObject_UpdateString $json "output.path" "qa_output/qr_wifi.png"
CkJsonObject_UpdateBool $json "output.overwrite" 1
CkJsonObject_UpdateString $json "output.return" "none"

set fmt [new_CkFormats]

set jsonOut [new_CkJsonObject]

set success [CkFormats_QrCode $fmt "generate" $json $jsonOut]
if {$success == 0} then {
    puts [CkFormats_lastErrorText $fmt]
    delete_CkJsonObject $json
    delete_CkFormats $fmt
    delete_CkJsonObject $jsonOut
    exit
}

puts "file: [CkJsonObject_stringOf $jsonOut {outputs[0].path}]"
puts "QR version: [CkJsonObject_IntOf $jsonOut {symbols[0].selectedEncoding.version}]"
puts "image: [CkJsonObject_IntOf $jsonOut {outputs[0].width}] x [CkJsonObject_IntOf $jsonOut {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

delete_CkJsonObject $json
delete_CkFormats $fmt
delete_CkJsonObject $jsonOut