Java Requires Chilkat v11.7.0+

Handle QR Code Errors

See more QR Code Examples

Demonstrates what happens when a request is refused. QrCode returns false and the response holds errors[0] with three members: a code that does not change between versions, the path of the request member at fault (a JSON Pointer such as /encoding/qr/version), and a message. Requests are checked strictly, so a misspelled option is an error rather than being silently ignored. LastErrorText has the same information in more detail. Chilkat2 Java

import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Formats;
import com.chilkatsoft.chilkat2.JsonObject;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example requires the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

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

        // 1. A misspelled option: "moduleSise" for "moduleSize".
        json.updateString("payload.text", "https://www.chilkatsoft.com/");
        json.updateInt("render.moduleSise", 8);
        try {
            fmt.qrCode("generate", json, jsonOut);
        } catch (ChilkatException e) {
            System.out.println("code: " + jsonOut.stringOf("errors[0].code"));
            System.out.println("path: " + jsonOut.stringOf("errors[0].path"));
            System.out.println("message: " + jsonOut.stringOf("errors[0].message"));
        }

        // 2. A value out of range: QR versions are 1 to 40.
        json.clear();
        json.updateString("payload.text", "https://www.chilkatsoft.com/");
        json.updateInt("encoding.qr.version", 41);
        try {
            fmt.qrCode("generate", json, jsonOut);
        } catch (ChilkatException e) {
            System.out.println("code: " + jsonOut.stringOf("errors[0].code"));
            System.out.println("path: " + jsonOut.stringOf("errors[0].path"));
            System.out.println("message: " + jsonOut.stringOf("errors[0].message"));
        }

        // 3. Too much data: this text does not fit a version 1 symbol.
        json.clear();
        json.updateString("payload.text", "https://www.chilkatsoft.com/barcode_overview.asp");
        json.updateInt("encoding.qr.version", 1);
        try {
            fmt.qrCode("generate", json, jsonOut);
        } catch (ChilkatException e) {
            System.out.println("code: " + jsonOut.stringOf("errors[0].code"));
            System.out.println("path: " + jsonOut.stringOf("errors[0].path"));
            System.out.println("message: " + jsonOut.stringOf("errors[0].message"));
        }

        // A program can act on the code.
        if ("capacityExceeded".equals(jsonOut.stringOf("errors[0].code"))) {
            System.out.println("The text is too long for the symbol size allowed.");
        }

        // Sample output:

        // code: unknownOption
        // path: /render/moduleSise
        // message: unknown option
        // code: outOfRange
        // path: /encoding/qr/version
        // message: the value is out of range
        // code: capacityExceeded
        // path: /payload
        // message: the payload does not fit the requested QR version at the requested error-correction level
        // The text is too long for the symbol size allowed.
    }
}