Swift 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. Swift

func chilkatTest() {
    var success: Bool = false

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

    let fmt = CkoFormats()!
    let json = CkoJsonObject()!
    let jsonOut = CkoJsonObject()!

    //  Digits only.
    json.updateString(jsonPath: "payload.text", value: "00123456789012345678")
    success = fmt.qrCode(op: "generate", jsonIn: json, jsonOut: jsonOut)
    if success == false {
        print("\(fmt.lastErrorText!)")
        return
    }

    print("digits: mode \(jsonOut.string(of: "symbols[0].selectedEncoding.mode")!), version \(jsonOut.int(of: "symbols[0].selectedEncoding.version").intValue)")

    //  Upper-case letters, digits, space and - are all in the alphanumeric set.
    json.updateString(jsonPath: "payload.text", value: "ORDER-12345 LOT A7 SHELF 12-C")
    success = fmt.qrCode(op: "generate", jsonIn: json, jsonOut: jsonOut)
    if success == false {
        print("\(fmt.lastErrorText!)")
        return
    }

    print("upper case: mode \(jsonOut.string(of: "symbols[0].selectedEncoding.mode")!), version \(jsonOut.int(of: "symbols[0].selectedEncoding.version").intValue)")

    //  Lower-case letters are not, so the same text in lower case needs byte mode.
    json.updateString(jsonPath: "payload.text", value: "order-12345 lot a7 shelf 12-c")
    success = fmt.qrCode(op: "generate", jsonIn: json, jsonOut: jsonOut)
    if success == false {
        print("\(fmt.lastErrorText!)")
        return
    }

    print("lower case: mode \(jsonOut.string(of: "symbols[0].selectedEncoding.mode")!), version \(jsonOut.int(of: "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(jsonPath: "payload.text", value: "00123456789012345678")
    json.updateString(jsonPath: "encoding.qr.mode", value: "byte")
    success = fmt.qrCode(op: "generate", jsonIn: json, jsonOut: jsonOut)
    if success == false {
        print("\(fmt.lastErrorText!)")
        return
    }

    print("digits as bytes: mode \(jsonOut.string(of: "symbols[0].selectedEncoding.mode")!), version \(jsonOut.int(of: "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

}