Visual FoxPro Requires Chilkat v11.7.0+

Generate a QR Code with the Barcode Method

See more QR Code Examples

Demonstrates the Barcode method, which is the general form of QrCode: the request names the symbology, and everything else is the same. QrCode is Barcode with the symbology already set to qr, and identical requests to the two methods give identical results. A program that will produce more than one kind of barcode can use Barcode for all of them. Visual FoxPro

LOCAL lnSuccess
LOCAL loJson
LOCAL loFmt
LOCAL loJsonOut
LOCAL loJson2

lnSuccess = 0

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

loJson = CreateObject('Chilkat.JsonObject')
loJson.UpdateString("symbology","qr")
loJson.UpdateString("payload.text","https://www.chilkatsoft.com/")
loJson.UpdateString("output.path","qa_output/qr_from_barcode.png")
loJson.UpdateBool("output.overwrite",1)
loJson.UpdateString("output.return","none")

loFmt = CreateObject('Chilkat.Formats')
loJsonOut = CreateObject('Chilkat.JsonObject')
lnSuccess = loFmt.Barcode("generate",loJson,loJsonOut)
IF (lnSuccess = 0) THEN
    ? loFmt.LastErrorText
    RELEASE loJson
    RELEASE loFmt
    RELEASE loJsonOut
    CANCEL
ENDIF

? "symbology: " + loJsonOut.StringOf("symbols[0].symbology")
? "QR version: " + STR(loJsonOut.IntOf("symbols[0].selectedEncoding.version"))
? "image: " + STR(loJsonOut.IntOf("outputs[0].width")) + " x " + STR(loJsonOut.IntOf("outputs[0].height")) + " pixels"

*  The image written to qa_output/qr_from_barcode.png:

*  

*  Barcode requires the symbology.  QrCode does not.
loJson2 = CreateObject('Chilkat.JsonObject')
loJson2.UpdateString("payload.text","https://www.chilkatsoft.com/")
lnSuccess = loFmt.Barcode("generate",loJson2,loJsonOut)
IF (lnSuccess = 0) THEN
    ? "without a symbology: " + loJsonOut.StringOf("errors[0].code") + " at " + loJsonOut.StringOf("errors[0].path")
ENDIF

*  Sample output:

*  symbology: qr
*  QR version: 3
*  image: 148 x 148 pixels
*  without a symbology: missingOption at /symbology

RELEASE loJson
RELEASE loFmt
RELEASE loJsonOut
RELEASE loJson2