CkPython Requires Chilkat v11.7.0+

Handle QR Code Errors

See more QR Code Examples

Demonstrates what happens when a request is refused. QrCode returns false and the response holds errors[0] with three members: a code that does not change between versions, the path of the request member at fault (a JSON Pointer such as /encoding/qr/version), and a message. Requests are checked strictly, so a misspelled option is an error rather than being silently ignored. LastErrorText has the same information in more detail. CkPython

import chilkat

success = False

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

fmt = chilkat.CkFormats()
json = chilkat.CkJsonObject()
jsonOut = chilkat.CkJsonObject()

#  1. A misspelled option: "moduleSise" for "moduleSize".
json.UpdateString("payload.text","https://www.chilkatsoft.com/")
json.UpdateInt("render.moduleSise",8)
success = fmt.QrCode("generate",json,jsonOut)
if (success == False):
    print("code: " + jsonOut.stringOf("errors[0].code"))
    print("path: " + jsonOut.stringOf("errors[0].path"))
    print("message: " + jsonOut.stringOf("errors[0].message"))

#  2. A value out of range: QR versions are 1 to 40.
json.Clear()
json.UpdateString("payload.text","https://www.chilkatsoft.com/")
json.UpdateInt("encoding.qr.version",41)
success = fmt.QrCode("generate",json,jsonOut)
if (success == False):
    print("code: " + jsonOut.stringOf("errors[0].code"))
    print("path: " + jsonOut.stringOf("errors[0].path"))
    print("message: " + jsonOut.stringOf("errors[0].message"))

#  3. Too much data: this text does not fit a version 1 symbol.
json.Clear()
json.UpdateString("payload.text","https://www.chilkatsoft.com/barcode_overview.asp")
json.UpdateInt("encoding.qr.version",1)
success = fmt.QrCode("generate",json,jsonOut)
if (success == False):
    print("code: " + jsonOut.stringOf("errors[0].code"))
    print("path: " + jsonOut.stringOf("errors[0].path"))
    print("message: " + jsonOut.stringOf("errors[0].message"))

#  A program can act on the code.
if (jsonOut.stringOf("errors[0].code") == "capacityExceeded"):
    print("The text is too long for the symbol size allowed.")

#  Sample output:

#  code: unknownOption
#  path: /render/moduleSise
#  message: unknown option
#  code: outOfRange
#  path: /encoding/qr/version
#  message: the value is out of range
#  code: capacityExceeded
#  path: /payload
#  message: the payload does not fit the requested QR version at the requested error-correction level
#  The text is too long for the symbol size allowed.