Unicode C++ Requires Chilkat v11.7.0+

Embed a QR Code in HTML as a Data URI

See more QR Code Examples

Demonstrates putting a QR code directly into an HTML page or HTML email with no separate image file. The base64 PNG returned by QrCode becomes the src of an img tag as a data URI, which is the MIME type from outputs[0].mimeType followed by the base64 from outputs[0].base64. Unicode C++

#include <CkJsonObjectW.h>
#include <CkFormatsW.h>
#include <CkStringBuilderW.h>

void ChilkatSample(void)
    {
    bool success = false;

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

    CkJsonObjectW json;
    json.UpdateString(L"payload.text",L"https://www.chilkatsoft.com/");
    json.UpdateInt(L"render.moduleSize",5);

    CkFormatsW fmt;
    CkJsonObjectW jsonOut;
    success = fmt.QrCode(L"generate",json,jsonOut);
    if (success == false) {
        wprintf(L"%s\n",fmt.lastErrorText());
        return;
    }

    //  A data URI has the form  data:<MIME type>;base64,<base64 data>
    CkStringBuilderW sbHtml;
    sbHtml.Append(L"<html><body><p>Scan to visit chilkatsoft.com</p><img alt=\"QR code\" width=\"");
    sbHtml.AppendInt(jsonOut.IntOf(L"outputs[0].width"));
    sbHtml.Append(L"\" height=\"");
    sbHtml.AppendInt(jsonOut.IntOf(L"outputs[0].height"));
    sbHtml.Append(L"\" src=\"data:");
    sbHtml.Append(jsonOut.stringOf(L"outputs[0].mimeType"));
    sbHtml.Append(L";base64,");
    sbHtml.Append(jsonOut.stringOf(L"outputs[0].base64"));
    sbHtml.Append(L"\"></body></html>");

    success = sbHtml.WriteFile(L"qa_output/qr_page.html",L"utf-8",false);
    if (success == false) {
        wprintf(L"%s\n",sbHtml.lastErrorText());
        return;
    }

    wprintf(L"image: %d x %d pixels\n",jsonOut.IntOf(L"outputs[0].width"),jsonOut.IntOf(L"outputs[0].height"));
    wprintf(L"HTML length: %d\n",sbHtml.get_Length());

    //  The page, as a browser shows it:

    //  

    //  Sample output:

    //  image: 185 x 185 pixels
    //  HTML length: 1211
    }