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. 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 sbHtml;

    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_UpdateInt(json,"render.moduleSize",5);

    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;
    }

    //  A data URI has the form  data:<MIME type>;base64,<base64 data>
    sbHtml = CkStringBuilder_Create();
    CkStringBuilder_Append(sbHtml,"<html><body><p>Scan to visit chilkatsoft.com</p><img alt=\"QR code\" width=\"");
    CkStringBuilder_AppendInt(sbHtml,CkJsonObject_IntOf(jsonOut,"outputs[0].width"));
    CkStringBuilder_Append(sbHtml,"\" height=\"");
    CkStringBuilder_AppendInt(sbHtml,CkJsonObject_IntOf(jsonOut,"outputs[0].height"));
    CkStringBuilder_Append(sbHtml,"\" src=\"data:");
    CkStringBuilder_Append(sbHtml,CkJsonObject_stringOf(jsonOut,"outputs[0].mimeType"));
    CkStringBuilder_Append(sbHtml,";base64,");
    CkStringBuilder_Append(sbHtml,CkJsonObject_stringOf(jsonOut,"outputs[0].base64"));
    CkStringBuilder_Append(sbHtml,"\"></body></html>");

    success = CkStringBuilder_WriteFile(sbHtml,"qa_output/qr_page.html","utf-8",FALSE);
    if (success == FALSE) {
        printf("%s\n",CkStringBuilder_lastErrorText(sbHtml));
        CkJsonObject_Dispose(json);
        CkFormats_Dispose(fmt);
        CkJsonObject_Dispose(jsonOut);
        CkStringBuilder_Dispose(sbHtml);
        return;
    }

    printf("image: %d x %d pixels\n",CkJsonObject_IntOf(jsonOut,"outputs[0].width"),CkJsonObject_IntOf(jsonOut,"outputs[0].height"));
    printf("HTML length: %d\n",CkStringBuilder_getLength(sbHtml));

    //  The page, as a browser shows it:

    //  

    //  Sample output:

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


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

    }