added qrcode encoder and decoder miniproject

Author: SoumyadevSaha

contrib/mini-projects/qr_code_encoder_decoder.py

@@ -0,0 +1,133 @@
+import tkinter as tk
+from tkinter import messagebox, filedialog
+import qrcode
+from PIL import Image, ImageTk
+import cv2
+from pyzbar.pyzbar import decode
+
+class QRCodeApp:
+ def _init_(self, root):
+ self.root = root
+ self.root.title("QR Code Encoder and Decoder")
+ 
+ self.main_frame = tk.Frame(root)
+ self.main_frame.pack(pady=20)
+ self.main_frame.pack(padx=30)
+ 
+ self.button1 = tk.Button(self.main_frame, text="Encode Text to QR Code", command=self.show_encode_screen)
+ self.button1.pack(pady=10)
+ 
+ self.button2 = tk.Button(self.main_frame, text="Decode QR Code from Camera", command=self.show_decode_screen)
+ self.button2.pack(pady=10)
+ 
+ self.encode_frame = None
+ self.decode_frame = None
+
+ def show_encode_screen(self):
+ self.clear_frame()
+ self.encode_frame = tk.Frame(self.root)
+ self.encode_frame.pack(pady=20)
+ self.encode_frame.pack(padx=30)
+ 
+ self.text_box = tk.Entry(self.encode_frame, width=50)
+ self.text_box.pack(pady=10)
+ 
+ self.convert_button = tk.Button(self.encode_frame, text="Convert", command=self.convert_to_qr)
+ self.convert_button.pack(pady=10)
+ 
+ self.back_button = tk.Button(self.encode_frame, text="Back", command=self.show_main_screen)
+ self.back_button.pack(pady=10)
+
+ def convert_to_qr(self):
+ text = self.text_box.get()
+ if text:
+ qr = qrcode.make(text)
+ file_path = filedialog.asksaveasfilename(defaultextension=".png", filetypes=[("PNG files", "*.png")])
+ if file_path:
+ qr.save(file_path)
+ messagebox.showinfo("Success", "QR Code saved successfully!")
+ else:
+ messagebox.showwarning("Input Error", "Please enter text to convert to QR Code.")
+ 
+ def show_decode_screen(self):
+ self.clear_frame()
+ self.decode_frame = tk.Frame(self.root)
+ self.decode_frame.pack(pady=10)
+ self.decode_frame.pack(padx=50)
+ 
+ self.start_camera_button = tk.Button(self.decode_frame, text="Start Camera", command=self.start_camera)
+ self.start_camera_button.pack(pady=0)
+ 
+ self.back_button = tk.Button(self.decode_frame, text="Back", command=self.show_main_screen)
+ self.back_button.pack(pady=10)
+ 
+ def start_camera(self):
+ cap = cv2.VideoCapture(0)
+ found_qr = False
+ 
+ while not found_qr:
+ ret, frame = cap.read()
+ if not ret:
+ break
+ 
+ decoded_objects = decode(frame)
+ for obj in decoded_objects:
+ points = obj.polygon
+ if len(points) > 4:
+ hull = cv2.convexHull(points, returnPoints=True)
+ else:
+ hull = points
+ 
+ n = len(hull)
+ for j in range(0, n):
+ cv2.line(frame, tuple(hull[j]), tuple(hull[(j+1) % n]), (255, 0, 0), 3)
+ 
+ qr_text = obj.data.decode("utf-8")
+ found_qr = True
+ cv2.putText(frame, qr_text, (50, 50), cv2.FONT_HERSHEY_SIMPLEX, 1, (0, 255, 0), 2)
+ self.display_decoded_text(qr_text)
+ 
+ cv2.imshow("QR Code Scanner", frame)
+ if cv2.waitKey(1) & 0xFF == ord('q'):
+ break
+ 
+ cap.release()
+ cv2.destroyAllWindows()
+ 
+ def display_decoded_text(self, text):
+ messagebox.showinfo("Decoded Text", text)
+ # create a new text file and write the decoded text to it
+ file_path = filedialog.asksaveasfilename(defaultextension=".txt", filetypes=[("Text files", "*.txt")])
+ if file_path:
+ with open(file_path, "w") as f:
+ f.write(text)
+ messagebox.showinfo("Success", "Decoded text saved successfully!")
+ 
+ def show_main_screen(self):
+ self.clear_frame()
+ self.main_frame.pack(pady=20)
+ self.main_frame.pack(padx=30)
+
+ # reset the encode and decode frames, basically re-run the _init_ method
+ self.button1 = tk.Button(self.main_frame, text="Encode Text to QR Code", command=self.show_encode_screen)
+ self.button1.pack(pady=10)
+ 
+ self.button2 = tk.Button(self.main_frame, text="Decode QR Code from Camera", command=self.show_decode_screen)
+ self.button2.pack(pady=10)
+
+ self.encode_frame = None
+ self.decode_frame = None
+
+
+ 
+ def clear_frame(self):
+ for widget in self.root.winfo_children():
+ widget.pack_forget()
+ widget.destroy()
+ self.main_frame = tk.Frame(self.root)
+ self.main_frame.pack(pady=20)
+
+if __name__ == "__main__":
+ root = tk.Tk()
+ app = QRCodeApp(root)
+ root.mainloop()