C Requires Chilkat v11.7.0+

Generate a QR Code as SVG

See more QR Code Examples

Demonstrates SVG output. An SVG is a vector image, so it stays sharp at any size, which suits print and responsive web pages. Setting output.format to svg and output.return to text returns the SVG document as a string in outputs[0].text. The SVG can also be written straight to a file with output.path, the same as a PNG. C

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

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

    success = FALSE;

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

    json = CkJsonObject_Create();
    CkJsonObject_UpdateString(json,"payload.text","https://www.chilkatsoft.com/");
    CkJsonObject_UpdateString(json,"output.format","svg");

    //  An SVG is text, so it can be returned as text rather than as base64.
    CkJsonObject_UpdateString(json,"output.return","text");

    fmt = CkFormats_Create();
    jsonOut = CkJsonObject_Create();
    success = CkFormats_QrCode(fmt,"generate",json,jsonOut);
    if (success == FALSE) {
        printf("%s\n",CkFormats_lastErrorText(fmt));
        CkJsonObject_Dispose(json);
        CkFormats_Dispose(fmt);
        CkJsonObject_Dispose(jsonOut);
        return;
    }

    sbSvg = CkStringBuilder_Create();
    CkJsonObject_StringOfSb(jsonOut,"outputs[0].text",sbSvg);

    printf("MIME type: %s\n",CkJsonObject_stringOf(jsonOut,"outputs[0].mimeType"));
    printf("size: %d x %d %s\n",CkJsonObject_IntOf(jsonOut,"outputs[0].width"),CkJsonObject_IntOf(jsonOut,"outputs[0].height"),CkJsonObject_stringOf(jsonOut,"outputs[0].units"));
    printf("SVG length: %d characters\n",CkStringBuilder_getLength(sbSvg));

    //  The SVG is a complete document that can be saved, or placed inline in an HTML page.
    success = CkStringBuilder_WriteFile(sbSvg,"qa_output/qr_chilkat.svg","utf-8",FALSE);
    if (success == FALSE) {
        printf("%s\n",CkStringBuilder_lastErrorText(sbSvg));
        CkJsonObject_Dispose(json);
        CkFormats_Dispose(fmt);
        CkJsonObject_Dispose(jsonOut);
        CkStringBuilder_Dispose(sbSvg);
        return;
    }

    //  The SVG:

    //  

    //  Sample output:

    //  MIME type: image/svg+xml
    //  size: 148 x 148 px
    //  SVG length: 12500 characters


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

    }