Objective-C Requires Chilkat v11.7.0+

QR Code Numeric, Alphanumeric and Byte Modes

See more QR Code Examples

Demonstrates the QR encoding modes. Digits alone are stored in numeric mode, and text made only of digits, upper-case letters, space and $ % * + - . / : in alphanumeric mode. Both pack more characters into a symbol than byte mode, which is used for everything else. QrCode chooses the most compact mode the text allows, and the response reports it. A product code written in upper case therefore gives a smaller symbol than the same code in lower case. Objective-C

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

BOOL success = NO;

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

CkoFormats *fmt = [[CkoFormats alloc] init];
CkoJsonObject *json = [[CkoJsonObject alloc] init];
CkoJsonObject *jsonOut = [[CkoJsonObject alloc] init];

//  Digits only.
[json UpdateString: @"payload.text" value: @"00123456789012345678"];
success = [fmt QrCode: @"generate" jsonIn: json jsonOut: jsonOut];
if (success == NO) {
    NSLog(@"%@",fmt.LastErrorText);
    return;
}

NSLog(@"%@%@%@%d",@"digits: mode ",[jsonOut StringOf: @"symbols[0].selectedEncoding.mode"],@", version ",[[jsonOut IntOf: @"symbols[0].selectedEncoding.version"] intValue]);

//  Upper-case letters, digits, space and - are all in the alphanumeric set.
[json UpdateString: @"payload.text" value: @"ORDER-12345 LOT A7 SHELF 12-C"];
success = [fmt QrCode: @"generate" jsonIn: json jsonOut: jsonOut];
if (success == NO) {
    NSLog(@"%@",fmt.LastErrorText);
    return;
}

NSLog(@"%@%@%@%d",@"upper case: mode ",[jsonOut StringOf: @"symbols[0].selectedEncoding.mode"],@", version ",[[jsonOut IntOf: @"symbols[0].selectedEncoding.version"] intValue]);

//  Lower-case letters are not, so the same text in lower case needs byte mode.
[json UpdateString: @"payload.text" value: @"order-12345 lot a7 shelf 12-c"];
success = [fmt QrCode: @"generate" jsonIn: json jsonOut: jsonOut];
if (success == NO) {
    NSLog(@"%@",fmt.LastErrorText);
    return;
}

NSLog(@"%@%@%@%d",@"lower case: mode ",[jsonOut StringOf: @"symbols[0].selectedEncoding.mode"],@", version ",[[jsonOut IntOf: @"symbols[0].selectedEncoding.version"] intValue]);

//  The mode can be named.  Byte mode can hold any text.  Naming a mode the text cannot use
//  (numeric for text with letters, for example) fails with conflictingOptions.
[json UpdateString: @"payload.text" value: @"00123456789012345678"];
[json UpdateString: @"encoding.qr.mode" value: @"byte"];
success = [fmt QrCode: @"generate" jsonIn: json jsonOut: jsonOut];
if (success == NO) {
    NSLog(@"%@",fmt.LastErrorText);
    return;
}

NSLog(@"%@%@%@%d",@"digits as bytes: mode ",[jsonOut StringOf: @"symbols[0].selectedEncoding.mode"],@", version ",[[jsonOut IntOf: @"symbols[0].selectedEncoding.version"] intValue]);

//  The four symbols, in the order they were made:

//  

//  Sample output:

//  digits: mode numeric, version 1
//  upper case: mode alphanumeric, version 2
//  lower case: mode byte, version 3
//  digits as bytes: mode byte, version 2