Objective-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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Objective-C

#import <CkoJsonObject.h>
#import <CkoFormats.h>

BOOL success = NO;

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

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json UpdateString: @"payload.text" value: @"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" value: @"Q"];
[json UpdateInt: @"render.moduleSize" value: [NSNumber numberWithInt: 8]];

//  Say which network it is under the code.
[json UpdateBool: @"render.text.enabled" value: YES];
[json UpdateString: @"render.text.value" value: @"Wi-Fi: Chilkat Guest"];
[json UpdateInt: @"render.text.scale" value: [NSNumber numberWithInt: 2]];

[json UpdateString: @"output.path" value: @"qa_output/qr_wifi.png"];
[json UpdateBool: @"output.overwrite" value: YES];
[json UpdateString: @"output.return" value: @"none"];

CkoFormats *fmt = [[CkoFormats alloc] init];
CkoJsonObject *jsonOut = [[CkoJsonObject alloc] init];
success = [fmt QrCode: @"generate" jsonIn: json jsonOut: jsonOut];
if (success == NO) {
    NSLog(@"%@",fmt.LastErrorText);
    return;
}

NSLog(@"%@%@",@"file: ",[jsonOut StringOf: @"outputs[0].path"]);
NSLog(@"%@%d",@"QR version: ",[[jsonOut IntOf: @"symbols[0].selectedEncoding.version"] intValue]);
NSLog(@"%@%d%@%d%@",@"image: ",[[jsonOut IntOf: @"outputs[0].width"] intValue],@" x ",[[jsonOut IntOf: @"outputs[0].height"] intValue],@" 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