C# 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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bool success = false;

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

Chilkat.JsonObject json = 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");

Chilkat.Formats fmt = new Chilkat.Formats();
Chilkat.JsonObject jsonOut = new Chilkat.JsonObject();
success = fmt.QrCode("generate",json,jsonOut);
if (success == false) {
    Debug.WriteLine(fmt.LastErrorText);
    return;
}

Debug.WriteLine("file: " + jsonOut.StringOf("outputs[0].path"));
Debug.WriteLine("QR version: " + Convert.ToString(jsonOut.IntOf("symbols[0].selectedEncoding.version")));
Debug.WriteLine("image: " + Convert.ToString(jsonOut.IntOf("outputs[0].width")) + " x " + Convert.ToString(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