DataFlex 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. DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Variant vJson
    Handle hoJson
    Handle hoFmt
    Variant vJsonOut
    Handle hoJsonOut
    Handle hoSbHtml
    String sTemp1
    Integer iTemp1
    Integer iTemp2

    Move False To iSuccess

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

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Get ComUpdateString Of hoJson "payload.text" "https://www.chilkatsoft.com/" To iSuccess
    Get ComUpdateInt Of hoJson "render.moduleSize" 5 To iSuccess

    Get Create (RefClass(cComChilkatFormats)) To hoFmt
    If (Not(IsComObjectCreated(hoFmt))) Begin
        Send CreateComObject of hoFmt
    End
    Get Create (RefClass(cComChilkatJsonObject)) To hoJsonOut
    If (Not(IsComObjectCreated(hoJsonOut))) Begin
        Send CreateComObject of hoJsonOut
    End
    Get pvComObject of hoJson to vJson
    Get pvComObject of hoJsonOut to vJsonOut
    Get ComQrCode Of hoFmt "generate" vJson vJsonOut To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoFmt To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    //  A data URI has the form  data:<MIME type>;base64,<base64 data>
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbHtml
    If (Not(IsComObjectCreated(hoSbHtml))) Begin
        Send CreateComObject of hoSbHtml
    End
    Get ComAppend Of hoSbHtml '<html><body><p>Scan to visit chilkatsoft.com</p><img alt="QR code" width="' To iSuccess
    Get ComIntOf Of hoJsonOut "outputs[0].width" To iTemp1
    Get ComAppendInt Of hoSbHtml iTemp1 To iSuccess
    Get ComAppend Of hoSbHtml '" height="' To iSuccess
    Get ComIntOf Of hoJsonOut "outputs[0].height" To iTemp1
    Get ComAppendInt Of hoSbHtml iTemp1 To iSuccess
    Get ComAppend Of hoSbHtml '" src="data:' To iSuccess
    Get ComStringOf Of hoJsonOut "outputs[0].mimeType" To sTemp1
    Get ComAppend Of hoSbHtml sTemp1 To iSuccess
    Get ComAppend Of hoSbHtml ";base64," To iSuccess
    Get ComStringOf Of hoJsonOut "outputs[0].base64" To sTemp1
    Get ComAppend Of hoSbHtml sTemp1 To iSuccess
    Get ComAppend Of hoSbHtml '"></body></html>' To iSuccess

    Get ComWriteFile Of hoSbHtml "qa_output/qr_page.html" "utf-8" False To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoSbHtml To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComIntOf Of hoJsonOut "outputs[0].width" To iTemp1
    Get ComIntOf Of hoJsonOut "outputs[0].height" To iTemp2
    Showln "image: " iTemp1 " x " iTemp2 " pixels"
    Get ComLength Of hoSbHtml To iTemp1
    Showln "HTML length: " iTemp1

    //  The page, as a browser shows it:

    //  

    //  Sample output:

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


End_Procedure