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

#include <C_CkFormats.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkFormats fmt;
    HCkJsonObject json;
    HCkJsonObject jsonOut;

    success = FALSE;

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

    fmt = CkFormats_Create();
    json = CkJsonObject_Create();
    jsonOut = CkJsonObject_Create();

    //  Digits only.
    CkJsonObject_UpdateString(json,"payload.text","00123456789012345678");
    success = CkFormats_QrCode(fmt,"generate",json,jsonOut);
    if (success == FALSE) {
        printf("%s\n",CkFormats_lastErrorText(fmt));
        CkFormats_Dispose(fmt);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        return;
    }

    printf("digits: mode %s, version %d\n",CkJsonObject_stringOf(jsonOut,"symbols[0].selectedEncoding.mode"),CkJsonObject_IntOf(jsonOut,"symbols[0].selectedEncoding.version"));

    //  Upper-case letters, digits, space and - are all in the alphanumeric set.
    CkJsonObject_UpdateString(json,"payload.text","ORDER-12345 LOT A7 SHELF 12-C");
    success = CkFormats_QrCode(fmt,"generate",json,jsonOut);
    if (success == FALSE) {
        printf("%s\n",CkFormats_lastErrorText(fmt));
        CkFormats_Dispose(fmt);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        return;
    }

    printf("upper case: mode %s, version %d\n",CkJsonObject_stringOf(jsonOut,"symbols[0].selectedEncoding.mode"),CkJsonObject_IntOf(jsonOut,"symbols[0].selectedEncoding.version"));

    //  Lower-case letters are not, so the same text in lower case needs byte mode.
    CkJsonObject_UpdateString(json,"payload.text","order-12345 lot a7 shelf 12-c");
    success = CkFormats_QrCode(fmt,"generate",json,jsonOut);
    if (success == FALSE) {
        printf("%s\n",CkFormats_lastErrorText(fmt));
        CkFormats_Dispose(fmt);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        return;
    }

    printf("lower case: mode %s, version %d\n",CkJsonObject_stringOf(jsonOut,"symbols[0].selectedEncoding.mode"),CkJsonObject_IntOf(jsonOut,"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.
    CkJsonObject_UpdateString(json,"payload.text","00123456789012345678");
    CkJsonObject_UpdateString(json,"encoding.qr.mode","byte");
    success = CkFormats_QrCode(fmt,"generate",json,jsonOut);
    if (success == FALSE) {
        printf("%s\n",CkFormats_lastErrorText(fmt));
        CkFormats_Dispose(fmt);
        CkJsonObject_Dispose(json);
        CkJsonObject_Dispose(jsonOut);
        return;
    }

    printf("digits as bytes: mode %s, version %d\n",CkJsonObject_stringOf(jsonOut,"symbols[0].selectedEncoding.mode"),CkJsonObject_IntOf(jsonOut,"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


    CkFormats_Dispose(fmt);
    CkJsonObject_Dispose(json);
    CkJsonObject_Dispose(jsonOut);

    }