CkPython Requires Chilkat v11.7.0+

Get the Modules of a QR Code (Bit Matrix)

See more QR Code Examples

Demonstrates getting the QR code itself, as a grid of dark and light modules, to draw with something other than the built-in PNG and SVG output: on a canvas, in a PDF, on a display, or with a label printer language. With output.includeModuleData the response has symbols[0].moduleData, a bit matrix with one bit per module, each row starting on a new byte, most significant bit first, 1 for dark. The quiet zone is not part of the matrix. The example prints the symbol using two characters per module. CkPython

import sys
import chilkat

success = False

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

json = chilkat.CkJsonObject()
json.UpdateString("payload.text","CHILKAT")
json.UpdateBool("output.includeModuleData",True)

fmt = chilkat.CkFormats()
jsonOut = chilkat.CkJsonObject()
success = fmt.QrCode("generate",json,jsonOut)
if (success == False):
    print(fmt.lastErrorText())
    sys.exit()

width = jsonOut.IntOf("symbols[0].moduleData.width")
height = jsonOut.IntOf("symbols[0].moduleData.height")
rowBytes = jsonOut.IntOf("symbols[0].moduleData.rowBytes")
print("kind: " + jsonOut.stringOf("symbols[0].moduleData.kind"))
print("modules: " + str(width) + " x " + str(height) + ", " + str(rowBytes) + " bytes per row")

#  The matrix is height rows of rowBytes bytes.
bd = chilkat.CkBinData()
success = bd.AppendEncoded(jsonOut.stringOf("symbols[0].moduleData.bytesBase64"),"base64")
if (success == False):
    print(bd.lastErrorText())
    sys.exit()

sbRow = chilkat.CkStringBuilder()

mask = 128
for row in range(0,height):
    sbRow.Clear()
    for col in range(0,width):
        #  The module at (col,row) is a bit of the byte at (row * rowBytes) + (col / 8).
        #  The leftmost module of each byte is its most significant bit.
        if ((col % 8) == 0):
            mask = 128

        b = bd.GetByte((row * rowBytes) + (col / 8))
        if (((b / mask) % 2) == 1):
            sbRow.Append("##")
        else:
            sbRow.Append("  ")

        mask = mask / 2

    print(sbRow.getAsString())

#  The same symbol as the PNG that the call also returned:

#  

#  Sample output:

#  kind: bitMatrix
#  modules: 21 x 21, 3 bytes per row
#  ##############              ##############
#  ##          ##      ####    ##          ##
#  ##  ######  ##  ##  ####    ##  ######  ##
#  ##  ######  ##  ##          ##  ######  ##
#  ##  ######  ##  ##  ##  ##  ##  ######  ##
#  ##          ##  ####  ##    ##          ##
#  ##############  ##  ##  ##  ##############
#                  ####
#  ##  ##########      ####    ##########
#      ####          ##  ########    ######
#  ####  ########    ####  ##  ####      ####
#        ##  ##      ############    ####  ##
#    ######  ####  ######  ##    ##  ##
#                  ##  ##  ##    ##  ##    ##
#  ##############        ##  ##    ##      ##
#  ##          ##  ##  ##        ######  ####
#  ##  ######  ##  ####  ##  ##    ##
#  ##  ######  ##  ##  ############    ##
#  ##  ######  ##  ##      ##  ####  ##
#  ##          ##    ##  ########          ##
#  ##############  ##      ##      ######