Decode QR Codes – Tkinter Projects 11

In this video I’ll show you how to decode QR Codes with Tkinter and Python.

In the last video we created QR codes, in this video I’ll show you how to open a QR Code and figure out what it says.

We’ll use pyzbar to do most of the heavy lifting on this one.

Python Code: decode_qr.py
(Github Code)

from tkinter import *
import pyqrcode
import png
from tkinter import filedialog
from PIL import Image, ImageTk
from pyzbar.pyzbar import decode

root = Tk()
root.title("QR Code Generator")
root.iconbitmap('c:/tkinter.com/codemy.ico')
root.geometry('500x550')

def create_code():
	#File Dialog
	input_path = filedialog.asksaveasfilename(title="Save Image",
		filetyp=(("PNG File", ".png"), ("All Files", "*.*")))

	if input_path:
		if input_path.endswith(".png"):
			# Create QR Code from entry box
			get_code = pyqrcode.create(my_entry.get())
			# Save as PNG File
			get_code.png(input_path, scale=5)

		else:
			# Add that .png to the end of the file name
			input_path = f'{input_path}.png'
			# Create QR Code from entry box
			get_code = pyqrcode.create(my_entry.get())
			# Save as PNG File
			get_code.png(input_path, scale=5)

		# Put QR code on screen
		global get_image
		get_image = ImageTk.PhotoImage(Image.open(input_path))
		# Add image to label
		my_label.config(image=get_image)
		
		# Delete entry box
		my_entry.delete(0, END)
		# Flash up a finished message
		my_entry.insert(0, "Finished!")


def clear_all():
	my_entry.delete(0, END)
	my_label.config(image='')

# Decode QR Code
def decode_it():
	# Open a qr code image
	#File Dialog
	input_path = filedialog.askopenfilename(title="Open Image",
		filetyp=(("PNG File", ".png"), ("All Files", "*.*")))

	if input_path:
		# Put QR code on screen
		global get_image
		get_image = ImageTk.PhotoImage(Image.open(input_path))
		# Add image to label
		my_label.config(image=get_image)
		
		# Decode QR Code
		decode_QR = decode(Image.open(input_path))
		#print(decode_QR)
		result_label.config(text=f"QR Decoded: {decode_QR[0].data.decode('ascii')}")


		# Delete entry box
		my_entry.delete(0, END)
		# Flash up a finished message
		my_entry.insert(0, "Finished!")

# Create GUI
my_entry = Entry(root, font=("Helvetica", 18))
my_entry.pack(pady=20)

my_button = Button(root, text="Create QR Code", command=create_code)
my_button.pack(pady=20)

my_button2 = Button(root, text="Clear", command=clear_all)
my_button2.pack()

my_label = Label(root, text='')
my_label.pack(pady=20)

result_label = Label(root, text='')
result_label.pack(pady=20)

result_button = Button(root, text="Decode QR Code", command=decode_it)
result_button.pack(pady=20)

root.mainloop()