B4X 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. B4X

Dim success As Boolean = False

'  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.
Dim sbText As ChilkatStringBuilder
sbText.Initialize
sbText.Append("Gr\u00fc\u00dfe aus M\u00fcnchen")
sbText.Decode("json", "utf-8")

Dim json As ChilkatJsonObject
json.Initialize
json.UpdateSb("payload.text", sbText)
json.UpdateString("output.path", "qa_output/qr_utf8.png")
json.UpdateBool("output.overwrite", True)
json.UpdateString("output.return", "none")

Dim fmt As ChilkatFormats
fmt.Initialize
Dim jsonOut As ChilkatJsonObject
jsonOut.Initialize
success = fmt.QrCode("generate", json, jsonOut)
If success = False Then
    Log(fmt.LastErrorText)
    Return
End If


'  17 characters, three of which take two bytes in UTF-8.
Log("characters: " & sbText.Length)
Log("bytes encoded: " & jsonOut.IntOf("symbols[0].payloadBytes"))
Log("ECI header: " & jsonOut.HasMember("symbols[0].selectedEncoding.eci"))

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

'  

'  The same text with an ECI header declaring UTF-8.
json.UpdateInt("encoding.eci", 26)
json.UpdateString("output.path", "qa_output/qr_utf8_eci.png")
success = fmt.QrCode("generate", json, jsonOut)
If success = False Then
    Log(fmt.LastErrorText)
    Return
End If

Log("with encoding.eci = 26, ECI header: " & jsonOut.HasMember("symbols[0].selectedEncoding.eci") & ", value " & jsonOut.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