Visual FoxPro Requires Chilkat v11.7.0+

QR Code with Non-English Text (UTF-8 and ECI)

See more QR Code Examples

Demonstrates text outside ASCII. QrCode always stores text as UTF-8 bytes, which is what phones expect. A QR code can also say so explicitly with an ECI header: setting encoding.eci to 26 declares the bytes to be UTF-8, for readers that would otherwise assume another character set. The header costs a little space, and a few older readers do not understand it, so it is off by default. Visual FoxPro

LOCAL lnSuccess
LOCAL loSbText
LOCAL loJson
LOCAL loFmt
LOCAL loJsonOut

lnSuccess = 0

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

*  The text is "Gruesse aus Muenchen" written with u-umlaut and sharp s.  It is given here with
*  JSON escapes only so that this source is plain ASCII.  Decode turns the escapes into characters.
loSbText = CreateObject('Chilkat.StringBuilder')
loSbText.Append("Gr\u00fc\u00dfe aus M\u00fcnchen")
loSbText.Decode("json","utf-8")

loJson = CreateObject('Chilkat.JsonObject')
loJson.UpdateSb("payload.text",loSbText)
loJson.UpdateString("output.path","qa_output/qr_utf8.png")
loJson.UpdateBool("output.overwrite",1)
loJson.UpdateString("output.return","none")

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

*  17 characters, three of which take two bytes in UTF-8.
? "characters: " + STR(loSbText.Length)
? "bytes encoded: " + STR(loJsonOut.IntOf("symbols[0].payloadBytes"))
? "ECI header: " + STR(loJsonOut.HasMember("symbols[0].selectedEncoding.eci"))

*  Without an ECI header (qa_output/qr_utf8.png):

*  

*  The same text with an ECI header declaring UTF-8.
loJson.UpdateInt("encoding.eci",26)
loJson.UpdateString("output.path","qa_output/qr_utf8_eci.png")
lnSuccess = loFmt.QrCode("generate",loJson,loJsonOut)
IF (lnSuccess = 0) THEN
    ? loFmt.LastErrorText
    RELEASE loSbText
    RELEASE loJson
    RELEASE loFmt
    RELEASE loJsonOut
    CANCEL
ENDIF

? "with encoding.eci = 26, ECI header: " + STR(loJsonOut.HasMember("symbols[0].selectedEncoding.eci")) + ", value " + STR(loJsonOut.IntOf("symbols[0].selectedEncoding.eci"))

*  With the ECI header (qa_output/qr_utf8_eci.png).  Both scan as the same text:

*  

*  Sample output:

*  characters: 17
*  bytes encoded: 20
*  ECI header: False
*  with encoding.eci = 26, ECI header: True, value 26

RELEASE loSbText
RELEASE loJson
RELEASE loFmt
RELEASE loJsonOut