DataFlex Requires Chilkat v11.7.0+

QR Code with a Text Caption

See more QR Code Examples

Demonstrates printing a line of text under a QR code, such as the order number or the address the code holds, so that a person can read it too. render.text turns the caption on and gives its value, which is printable ASCII and is drawn in a built-in font that needs no font files. The caption can go above or below the symbol, be aligned left, center or right, and be scaled. DataFlex

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Variant vJson
    Handle hoJson
    Handle hoFmt
    Variant vJsonOut
    Handle hoJsonOut
    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/order/12345" To iSuccess
    Get ComUpdateInt Of hoJson "render.moduleSize" 6 To iSuccess

    //  The caption.  It need not be the same as the text in the QR code.
    Get ComUpdateBool Of hoJson "render.text.enabled" True To iSuccess
    Get ComUpdateString Of hoJson "render.text.value" "ORDER 12345" To iSuccess
    //  position is "below" (the default) or "above".  alignment is "center" (the default), "left" or "right".
    Get ComUpdateString Of hoJson "render.text.position" "below" To iSuccess
    //  Each dot of the caption's font is drawn this many pixels wide.
    Get ComUpdateInt Of hoJson "render.text.scale" 3 To iSuccess

    Get ComUpdateString Of hoJson "output.path" "qa_output/qr_caption.png" To iSuccess
    Get ComUpdateBool Of hoJson "output.overwrite" True To iSuccess
    Get ComUpdateString Of hoJson "output.return" "none" 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

    Get ComStringOf Of hoJsonOut "measurements[0].text" To sTemp1
    Showln "caption: " sTemp1
    Get ComIntOf Of hoJsonOut "measurements[0].textScale" To iTemp1
    Showln "caption scale: " iTemp1
    Get ComIntOf Of hoJsonOut "measurements[0].textBandPx" To iTemp1
    Showln "height added for the caption: " iTemp1 " pixels"
    Get ComIntOf Of hoJsonOut "measurements[0].canvasWidth" To iTemp1
    Get ComIntOf Of hoJsonOut "measurements[0].canvasHeight" To iTemp2
    Showln "image: " iTemp1 " x " iTemp2 " pixels"

    //  The image written to qa_output/qr_caption.png:

    //  

    //  Sample output:

    //  caption: ORDER 12345
    //  caption scale: 3
    //  height added for the caption: 21 pixels
    //  image: 222 x 243 pixels


End_Procedure