✅ Improved & fixed the QR_GUI application

Beginner_Projects/QR Generator/QR_code_generator_GUI.py

@@ -1,77 +1,117 @@
 import qrcode
 import customtkinter
-from PIL import Image  
-from customtkinter import *
-
-app = customtkinter.CTk()
-app.title("QR Code Generator")
-app.geometry("350x600")
-
-img = None
-link = None
-qr_image = None
-image_label = None
-
-def generate_qr():
-
-    global link, qr_image, image_label, img
-
-    link = link_entry.get()
-    name = name_entry.get()
-
-    qr = qrcode.QRCode(
-        version=1,
-        error_correction=qrcode.constants.ERROR_CORRECT_M,
-    )
-    qr.add_data(link)
-    qr.make(fit=True)
-    img = qr.make_image(fill_color="black", back_color="white")
-    img.save(f"{name}.png")
-
-    my_image = customtkinter.CTkImage(light_image=Image.open(f"{name}.png"),
-                                  dark_image=Image.open(f"{name}.png"),
-                                  size=(200, 200))
-
-
-    image_label = customtkinter.CTkLabel(app, image=my_image, text="") 
-    image_label.grid(row=5, column=0)
-
-def download_qr():
-    global link, qr_image, image_label
-
-    file = f"{name_entry.get()}.png"
-    img.save(file)
-
-
-label = customtkinter.CTkLabel(app, text="QR Code Generator", font=("Consolas", 30), compound="center")
-label.grid(row=0, column=0, padx=20, pady=20)
-
-link_entry = customtkinter.CTkEntry(app, width=300)
-link_entry.grid(row=1, column=0, padx=20, pady=20)
-
-link_entry.configure(placeholder_text="Link")
-
-name_entry = customtkinter.CTkEntry(app, width=300)
-name_entry.grid(row=2, column=0, padx=20, pady=20)
-
-name_entry.configure(placeholder_text="Name OF QR Code")
-
-button = customtkinter.CTkButton(app, text="Generate QR Code", command=generate_qr, width=300)
-button.grid(row=3, column=0, padx=20, pady=20)
-
-button_download = CTkButton(app, text="Download", command=download_qr, width=300)
-button_download.grid(row=4, column=0, padx=20, pady=20)
-
-image_label = None
-
-def change_theme():
-  if customtkinter.get_appearance_mode() == "Light":
-    customtkinter.set_appearance_mode("dark")
-  else:
-    customtkinter.set_appearance_mode("light")
-
-# Theme Change Btton
-theme_button = customtkinter.CTkButton(app, text="Theme", command=change_theme, width=300)
-theme_button.grid(row=7, column=0)
-
-app.mainloop()
+from PIL import Image
+import os
+from tkinter import messagebox
+
+class QRCodeGenerator:
+    def __init__(self):
+        self.app = customtkinter.CTk()
+        self.app.title("QR Code Generator")
+        self.app.geometry("350x600")
+
+        self.img = None
+        self.image_label = None
+
+        self.setup_ui()
+
+    def setup_ui(self):
+        # Title Label
+        label = customtkinter.CTkLabel(self.app, text="QR Code Generator", 
+                                     font=("Consolas", 30))
+        label.grid(row=0, column=0, padx=20, pady=20)
+
+        # Entry Fields
+        self.link_entry = customtkinter.CTkEntry(self.app, width=300)
+        self.link_entry.grid(row=1, column=0, padx=20, pady=20)
+        self.link_entry.configure(placeholder_text="Link")
+
+        self.name_entry = customtkinter.CTkEntry(self.app, width=300)
+        self.name_entry.grid(row=2, column=0, padx=20, pady=20)
+        self.name_entry.configure(placeholder_text="Name of QR Code")
+
+        # Buttons
+        button = customtkinter.CTkButton(self.app, text="Generate QR Code", 
+                                       command=self.generate_qr, width=300)
+        button.grid(row=3, column=0, padx=20, pady=20)
+
+        button_download = customtkinter.CTkButton(self.app, text="Download", 
+                                                command=self.download_qr, width=300)
+        button_download.grid(row=4, column=0, padx=20, pady=20)
+
+        theme_button = customtkinter.CTkButton(self.app, text="Theme", 
+                                             command=self.change_theme, width=300)
+        theme_button.grid(row=7, column=0)
+
+    def generate_qr(self):
+        try:
+            link = self.link_entry.get().strip()
+            name = self.name_entry.get().strip()
+
+            if not link or not name:
+                messagebox.showerror("Error", "Please fill in both fields")
+                return
+
+            # Clean up previous image label if it exists
+            if self.image_label:
+                self.image_label.destroy()
+
+            qr = qrcode.QRCode(
+                version=1,
+                error_correction=qrcode.constants.ERROR_CORRECT_M,
+            )
+            qr.add_data(link)
+            qr.make(fit=True)
+
+            self.img = qr.make_image(fill_color="black", back_color="white")
+            temp_path = f"temp_{name}.png"
+            self.img.save(temp_path)
+
+            my_image = customtkinter.CTkImage(
+                light_image=Image.open(temp_path),
+                dark_image=Image.open(temp_path),
+                size=(200, 200)
+            )
+
+            self.image_label = customtkinter.CTkLabel(self.app, image=my_image, text="")
+            self.image_label.grid(row=5, column=0)
+
+            # Clean up temporary file
+            os.remove(temp_path)
+
+        except Exception as e:
+            messagebox.showerror("Error", f"Failed to generate QR code: {str(e)}")
+
+    def download_qr(self):
+        try:
+            if not self.img:
+                messagebox.showerror("Error", "Please generate a QR code first")
+                return
+
+            name = self.name_entry.get().strip()
+            if not name:
+                messagebox.showerror("Error", "Please enter a name for the file")
+                return
+
+            file_path = f"{name}.png"
+            if os.path.exists(file_path):
+                if not messagebox.askyesno("Warning", "File already exists. Overwrite?"):
+                    return
+
+            self.img.save(file_path)
+            messagebox.showinfo("Success", f"QR code saved as {file_path}")
+
+        except Exception as e:
+            messagebox.showerror("Error", f"Failed to save QR code: {str(e)}")
+
+    def change_theme(self):
+        current_theme = customtkinter.get_appearance_mode()
+        new_theme = "light" if current_theme == "Dark" else "dark"
+        customtkinter.set_appearance_mode(new_theme)
+
+    def run(self):
+        self.app.mainloop()
+
+if __name__ == "__main__":
+    app = QRCodeGenerator()
+    app.run()