Code for How to Build a GUI QR Code Generator and Reader in Python Tutorial

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qrcode_generator_detector.py

# this imports everything from the tkinter module from tkinter import * # importing the ttk module from tkinter that's for styling widgets from tkinter import ttk # importing message boxes like showinfo, showerror, askyesno from tkinter.messagebox from tkinter.messagebox import showinfo, showerror, askyesno # importing filedialog from tkinter from tkinter import filedialog as fd # this imports the qrcode module import qrcode # this imports the cv2 module import cv2 # the function to close the window def close_window(): # this will ask the user whether to close or not # if the value is yes/True the window will close if askyesno(title='Close QR Code Generator-Detector', message='Are you sure you want to close the application?'): # this destroys the window window.destroy() # the function for generating the QR Code def generate_qrcode(): # getting qrcode data from data_entry via get() function qrcode_data = str(data_entry.get()) # getting the qrcode name from the filename_entry via get() function qrcode_name = str(filename_entry.get()) # checking if the qrcode_name/filename_entry is empty if qrcode_name == '': # if its empty display an error message to the user showerror(title='Error', message='An error occurred' \ '\nThe following is ' \ 'the cause:\n->Empty filename entry field\n' \ 'Make sure the filename entry field is filled when generating the QRCode') # the else statement will execute when the qrcode_name/filename_entry is filled else: # confirm from the user whether to generate QR code or not if askyesno(title='Confirmation', message=f'Do you want to create a QRCode with the provided information?'): # the try block for generating the QR Code try: # Creating an instance of QRCode class qr = qrcode.QRCode(version = 1, box_size = 6, border = 4) # Adding data to the instance 'qr' qr.add_data(qrcode_data) # qr.make(fit = True) # the name for the QRCode name = qrcode_name + '.png' # making the QR code qrcode_image = qr.make_image(fill_color = 'black', back_color = 'white') # saving the QR code qrcode_image.save(name) # making the Image variable global global Image # opening the qrcode image file Image = PhotoImage(file=f'{name}') # displaying the image on the canvas via the image label image_label1.config(image=Image) # the button for resetting or clearing the QR code image on the canvas reset_button.config(state=NORMAL, command=reset) # this will catch all the errors that might occur except: showerror(title='Error', message='Please provide a valid filename') # the function for resetting or clearing the image label def reset(): # confirming if the user wants to reset or not if askyesno(title='Reset', message='Are you sure you want to reset?'): # if yes reset the label image_label1.config(image='') # and disable the button again reset_button.config(state=DISABLED) # the function to open file dialogs def open_dialog(): # getting the file name via the askopenfilename() function name = fd.askopenfilename() # deleting every data from the file_entry file_entry.delete(0, END) # inserting the file in the file_entry file_entry.insert(0, name) # the function to detect the QR codes def detect_qrcode(): # getting the image file from the file entry via get() function image_file = file_entry.get() # checking if the image_file is empty if image_file == '': # show error when the image_file entry is empty showerror(title='Error', message='Please provide a QR Code image file to detect') # executes when the image_file is not empty else: # code inside the try will detect the QR codes try: # reading the image file with cv2 qr_img = cv2.imread(f'{image_file}') # using the QRCodeDetector() function qr_detector = cv2.QRCodeDetector() # making the qrcodde_image global global qrcode_image # opening the qrcode_image using the PhotoImage qrcode_image = PhotoImage(file=f'{image_file}') # displaying the image via the image label image_label2.config(image=qrcode_image) # using the detectAndDecode() function detect and decode the QR code data, pts, st_code = qr_detector.detectAndDecode(qr_img) # displaying data on the data_label data_label.config(text=data) # this catches any errors that might occur except: # displaying an error message showerror(title='Error', message='An error occurred while detecting data from the provided file' \ '\nThe following could be ' \ 'the cause:\n->Wrong image file\n' \ 'Make sure the image file is a valid QRCode') # creating the window using the Tk() class window = Tk() # creates title for the window window.title('QR Code Generator-Detector') # adding the window's icon window.iconbitmap(window, 'icon.ico') # dimensions and position of the window window.geometry('500x480+440+180') # makes the window non-resizable window.resizable(height=FALSE, width=FALSE) # this is for closing the window via the close_window() function window.protocol('WM_DELETE_WINDOW', close_window) """Styles for the widgets, labels, entries, and buttons""" # style for the labels label_style = ttk.Style() label_style.configure('TLabel', foreground='#000000', font=('OCR A Extended', 11)) # style for the entries entry_style = ttk.Style() entry_style.configure('TEntry', font=('Dotum', 15)) # style for the buttons button_style = ttk.Style() button_style.configure('TButton', foreground='#000000', font=('DotumChe', 10)) # creating the Notebook widget tab_control = ttk.Notebook(window) # creating the two tabs with the ttk.Frame() first_tab = ttk.Frame(tab_control) second_tab = ttk.Frame(tab_control) # adding the two tabs to the Notebook tab_control.add(first_tab, text='QR Code Generator') tab_control.add(second_tab, text='QR Code Detector') # this makes the Notebook fill the entire main window so that its visible tab_control.pack(expand=1, fill="both") # creates the canvas for containing all the widgets in the first tab first_canvas = Canvas(first_tab, width=500, height=480) # packing the canvas to the first tab first_canvas.pack() # creates the canvas for containing all the widgets in the second tab second_canvas = Canvas(second_tab, width=500, height=480) # packing the canvas to the second tab second_canvas.pack() """Widgets for the first tab""" # creating an empty label image_label1 = Label(window) # adding the label to the canvas first_canvas.create_window(250, 150, window=image_label1) # creating a ttk label qrdata_label = ttk.Label(window, text='QRcode Data', style='TLabel') # creating a ttk entry data_entry = ttk.Entry(window, width=55, style='TEntry') # adding the label to the canvas first_canvas.create_window(70, 330, window=qrdata_label) # adding the entry to the canvas first_canvas.create_window(300, 330, window=data_entry) # creating a ttk label filename_label = ttk.Label(window, text='Filename', style='TLabel') # creating a ttk entry filename_entry = ttk.Entry(width=55, style='TEntry') # adding the label to the canvas first_canvas.create_window(84, 360, window=filename_label) # adding the entry to the canvas first_canvas.create_window(300, 360, window=filename_entry) # creating the reset button in a disabled mode reset_button = ttk.Button(window, text='Reset', style='TButton', state=DISABLED) # creating the generate button generate_button = ttk.Button(window, text='Generate QRCode', style='TButton', command=generate_qrcode) # adding the reset button to the canvas first_canvas.create_window(300, 390, window=reset_button) # adding the generate button to the canvas first_canvas.create_window(410, 390, window=generate_button) """Below are the widgets for the second tab""" # creating the second image label image_label2 = Label(window) # creating the data label data_label = ttk.Label(window) # adding the second image label to the second_canvas second_canvas.create_window(250, 150, window=image_label2) # adding the data label to the canvas second_canvas.create_window(250, 300, window=data_label) # creating the file_entry file_entry = ttk.Entry(window, width=60, style='TEntry') # creating the browse button browse_button = ttk.Button(window, text='Browse', style='TButton', command=open_dialog) # adding the entry to the canvas second_canvas.create_window(200, 350, window=file_entry) # adding the generate button to the canvas second_canvas.create_window(430, 350, window=browse_button) # creating the detect button detect_button = ttk.Button(window, text='Detect QRCode', style='TButton', command=detect_qrcode) # adding the detect button to the canvas second_canvas.create_window(65, 385, window=detect_button) # run the main window infinitely window.mainloop()