Python 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. Chilkat2-Python

import sys
import chilkat2

success = False

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

fmt = chilkat2.Formats()
json = chilkat2.JsonObject()
jsonOut = chilkat2.JsonObject()

# Digits only.
json.UpdateString("payload.text","00123456789012345678")
success = fmt.QrCode("generate",json,jsonOut)
if (success == False):
    print(fmt.LastErrorText)
    sys.exit()

print("digits: mode " + jsonOut.StringOf("symbols[0].selectedEncoding.mode") + ", version " + str(jsonOut.IntOf("symbols[0].selectedEncoding.version")))

# Upper-case letters, digits, space and - are all in the alphanumeric set.
json.UpdateString("payload.text","ORDER-12345 LOT A7 SHELF 12-C")
success = fmt.QrCode("generate",json,jsonOut)
if (success == False):
    print(fmt.LastErrorText)
    sys.exit()

print("upper case: mode " + jsonOut.StringOf("symbols[0].selectedEncoding.mode") + ", version " + str(jsonOut.IntOf("symbols[0].selectedEncoding.version")))

# Lower-case letters are not, so the same text in lower case needs byte mode.
json.UpdateString("payload.text","order-12345 lot a7 shelf 12-c")
success = fmt.QrCode("generate",json,jsonOut)
if (success == False):
    print(fmt.LastErrorText)
    sys.exit()

print("lower case: mode " + jsonOut.StringOf("symbols[0].selectedEncoding.mode") + ", version " + str(jsonOut.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.
json.UpdateString("payload.text","00123456789012345678")
json.UpdateString("encoding.qr.mode","byte")
success = fmt.QrCode("generate",json,jsonOut)
if (success == False):
    print(fmt.LastErrorText)
    sys.exit()

print("digits as bytes: mode " + jsonOut.StringOf("symbols[0].selectedEncoding.mode") + ", version " + str(jsonOut.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