Code for How to Generate and Read QR Code in Python Tutorial

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generate_qrcode.py

import qrcode import sys # from command line arguments data = sys.argv[1] filename = sys.argv[2] # generate qr code img = qrcode.make(data) # save img to a file img.save(filename)

generate_qrcode_with_control.py

import qrcode import numpy as np # data to encode data = "https://www.thepythoncode.com" # instantiate QRCode object qr = qrcode.QRCode(version=1, box_size=10, border=4) # add data to the QR code qr.add_data(data) # compile the data into a QR code array qr.make() # print the image shape print("The shape of the QR image:", np.array(qr.get_matrix()).shape) # transfer the array into an actual image img = qr.make_image(fill_color="white", back_color="black") # save it to a file img.save("site_inversed.png")

read_qrcode.py

import cv2 import sys filename = sys.argv[1] # read the QRCODE image img = cv2.imread(filename) # initialize the cv2 QRCode detector detector = cv2.QRCodeDetector() # detect and decode data, bbox, straight_qrcode = detector.detectAndDecode(img) # if there is a QR code if bbox is not None: print(f"QRCode data:\n{data}") # display the image with lines # length of bounding box n_lines = len(bbox) for i in range(n_lines): # draw all lines point1 = tuple(bbox[i][0]) point2 = tuple(bbox[(i+1) % n_lines][0]) cv2.line(img, point1, point2, color=(255, 0, 0), thickness=2) # display the result cv2.imshow("img", img) cv2.waitKey(0) cv2.destroyAllWindows()

read_qrcode_live.py

import cv2 # initalize the cam cap = cv2.VideoCapture(0) # initialize the cv2 QRCode detector detector = cv2.QRCodeDetector() while True: _, img = cap.read() # detect and decode data, bbox, _ = detector.detectAndDecode(img) # check if there is a QRCode in the image if bbox is not None: # display the image with lines for i in range(len(bbox)): # draw all lines cv2.line(img, tuple(bbox[i][0]), tuple(bbox[(i+1) % len(bbox)][0]), color=(255, 0, 0), thickness=2) if data: print("[+] QR Code detected, data:", data) # display the result cv2.imshow("img", img) if cv2.waitKey(1) == ord("q"): break cap.release() cv2.destroyAllWindows()