Visual FoxPro Requires Chilkat v11.7.0+

QR Code Numeric, Alphanumeric and Byte Modes

See more QR Code Examples

Demonstrates the QR encoding modes. Digits alone are stored in numeric mode, and text made only of digits, upper-case letters, space and $ % * + - . / : in alphanumeric mode. Both pack more characters into a symbol than byte mode, which is used for everything else. QrCode chooses the most compact mode the text allows, and the response reports it. A product code written in upper case therefore gives a smaller symbol than the same code in lower case. Visual FoxPro

LOCAL lnSuccess
LOCAL loFmt
LOCAL loJson
LOCAL loJsonOut

lnSuccess = 0

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

loFmt = CreateObject('Chilkat.Formats')
loJson = CreateObject('Chilkat.JsonObject')
loJsonOut = CreateObject('Chilkat.JsonObject')

*  Digits only.
loJson.UpdateString("payload.text","00123456789012345678")
lnSuccess = loFmt.QrCode("generate",loJson,loJsonOut)
IF (lnSuccess = 0) THEN
    ? loFmt.LastErrorText
    RELEASE loFmt
    RELEASE loJson
    RELEASE loJsonOut
    CANCEL
ENDIF

? "digits: mode " + loJsonOut.StringOf("symbols[0].selectedEncoding.mode") + ", version " + STR(loJsonOut.IntOf("symbols[0].selectedEncoding.version"))

*  Upper-case letters, digits, space and - are all in the alphanumeric set.
loJson.UpdateString("payload.text","ORDER-12345 LOT A7 SHELF 12-C")
lnSuccess = loFmt.QrCode("generate",loJson,loJsonOut)
IF (lnSuccess = 0) THEN
    ? loFmt.LastErrorText
    RELEASE loFmt
    RELEASE loJson
    RELEASE loJsonOut
    CANCEL
ENDIF

? "upper case: mode " + loJsonOut.StringOf("symbols[0].selectedEncoding.mode") + ", version " + STR(loJsonOut.IntOf("symbols[0].selectedEncoding.version"))

*  Lower-case letters are not, so the same text in lower case needs byte mode.
loJson.UpdateString("payload.text","order-12345 lot a7 shelf 12-c")
lnSuccess = loFmt.QrCode("generate",loJson,loJsonOut)
IF (lnSuccess = 0) THEN
    ? loFmt.LastErrorText
    RELEASE loFmt
    RELEASE loJson
    RELEASE loJsonOut
    CANCEL
ENDIF

? "lower case: mode " + loJsonOut.StringOf("symbols[0].selectedEncoding.mode") + ", version " + STR(loJsonOut.IntOf("symbols[0].selectedEncoding.version"))

*  The mode can be named.  Byte mode can hold any text.  Naming a mode the text cannot use
*  (numeric for text with letters, for example) fails with conflictingOptions.
loJson.UpdateString("payload.text","00123456789012345678")
loJson.UpdateString("encoding.qr.mode","byte")
lnSuccess = loFmt.QrCode("generate",loJson,loJsonOut)
IF (lnSuccess = 0) THEN
    ? loFmt.LastErrorText
    RELEASE loFmt
    RELEASE loJson
    RELEASE loJsonOut
    CANCEL
ENDIF

? "digits as bytes: mode " + loJsonOut.StringOf("symbols[0].selectedEncoding.mode") + ", version " + STR(loJsonOut.IntOf("symbols[0].selectedEncoding.version"))

*  The four symbols, in the order they were made:

*  

*  Sample output:

*  digits: mode numeric, version 1
*  upper case: mode alphanumeric, version 2
*  lower case: mode byte, version 3
*  digits as bytes: mode byte, version 2

RELEASE loFmt
RELEASE loJson
RELEASE loJsonOut