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. C#

bool success = false;

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

Chilkat.Formats fmt = new Chilkat.Formats();
Chilkat.JsonObject json = new Chilkat.JsonObject();
Chilkat.JsonObject jsonOut = new Chilkat.JsonObject();

//  Digits only.
json.UpdateString("payload.text","00123456789012345678");
success = fmt.QrCode("generate",json,jsonOut);
if (success == false) {
    Debug.WriteLine(fmt.LastErrorText);
    return;
}

Debug.WriteLine("digits: mode " + jsonOut.StringOf("symbols[0].selectedEncoding.mode") + ", version " + Convert.ToString(jsonOut.IntOf("symbols[0].selectedEncoding.version")));

//  Upper-case letters, digits, space and - are all in the alphanumeric set.
json.UpdateString("payload.text","ORDER-12345 LOT A7 SHELF 12-C");
success = fmt.QrCode("generate",json,jsonOut);
if (success == false) {
    Debug.WriteLine(fmt.LastErrorText);
    return;
}

Debug.WriteLine("upper case: mode " + jsonOut.StringOf("symbols[0].selectedEncoding.mode") + ", version " + Convert.ToString(jsonOut.IntOf("symbols[0].selectedEncoding.version")));

//  Lower-case letters are not, so the same text in lower case needs byte mode.
json.UpdateString("payload.text","order-12345 lot a7 shelf 12-c");
success = fmt.QrCode("generate",json,jsonOut);
if (success == false) {
    Debug.WriteLine(fmt.LastErrorText);
    return;
}

Debug.WriteLine("lower case: mode " + jsonOut.StringOf("symbols[0].selectedEncoding.mode") + ", version " + Convert.ToString(jsonOut.IntOf("symbols[0].selectedEncoding.version")));

//  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","00123456789012345678");
json.UpdateString("encoding.qr.mode","byte");
success = fmt.QrCode("generate",json,jsonOut);
if (success == false) {
    Debug.WriteLine(fmt.LastErrorText);
    return;
}

Debug.WriteLine("digits as bytes: mode " + jsonOut.StringOf("symbols[0].selectedEncoding.mode") + ", version " + Convert.ToString(jsonOut.IntOf("symbols[0].selectedEncoding.version")));

//  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