_tkinter.TclError：错误的窗口路径名“.!button2”

Question

I'm trying to run this code but it's giving "_tkinter.TclError: bad window path name ".!button2" " this error. But If I run the same code without ebook function, it's working fine. As I'm new to coding, any help will be appreciated.

from tkinter import *

root = Tk()
root.title("Application")
root.resizable(width=False, height=False)

mylabel0= Label(root, text="        ")
mylabel0.grid(row=0, column=0)

def ebook():
    import tkinter as tk
    from tkinter import filedialog
    from tkinter import messagebox
    from gtts import gTTS
    import pdfplumber

    book = tk.Tk()
    book.minsize(width=150, height=200)
    book.maxsize(width=300, height=420)

    canvas1 = tk.Canvas(book, width=300, height=420, bg='azure3', relief='raised')
    canvas1.grid()

    label1 = tk.Label(book, text="PDF Audio Store", bg='azure3')
    label1.config(font=('helvetica', 16))
    canvas1.create_window(150, 20, window=label1)

    final = ""

    def get_pdf():
        global final
        global pdf_checker

        try:
            import_file_path = filedialog.askopenfilename()

            if (str(import_file_path).endswith(".pdf")):
                pdf = pdfplumber.open(import_file_path)
                pdf_checker = pdf

                n = len(pdf.pages)

                for page in range(n):
                    data = pdf.pages[page].extract_text()
                    final = final + "\n" + data

                messagebox.showinfo("Information", "PDF is imported")
            else:
                raise Exception("Provide .pdf file only")

        except Exception as e:
            messagebox.showerror("Error", "{}".format(e))

        else:
            print("Continue to conversion")

    brows_pdf = tk.Button(text="PDF entry", command=get_pdf, bg='royalblue', fg="white", font=('helvetica', 12, 'bold'),
                          border=0,
                          activebackground="green")

It's giving error in this(👇) area specifically, create_window. Error Image

    canvas1.create_window(150, 60, window=brows_pdf)

    def convert_audio():
        global final
        global pdf_checker

        try:
            print("File Information")
            print(pdf_checker)
            export_file_path = filedialog.asksaveasfilename(defaultextension=".mp3")
            final_file = gTTS(text=final, lang="en")
            final_file.save(export_file_path)

            messagebox.showinfo("Information", "Audio file generated")
        except NameError:
            messagebox.showwarning("Warning", "Import PDF first")

    audio_button = tk.Button(text="Convert to Audio", command=convert_audio, bg='royalblue', fg="white",
                             font=('helvetica', 12, 'bold'),
                             border=0,
                             activebackground="green")
    canvas1.create_window(150, 100, window=audio_button)

    book.mainloop()

button_ebook= Button(root, text="E-Book📖", font=30, padx=25, pady=25, command=ebook, fg="black", bg="white", borderwidth=1)
button_ebook.grid(row=3, column=2, padx=10)




root.mainloop()

Answer 1

The root of the problem is that you can't use a button in one window that is a descendant of another window.

The first problem is that you are creating two instances of Tk . Buttons created in one instance are not available in the other. In this case, your button is in the original instance of Tk but your canvas is in the other.

The second problem is similar. Even when replacing the second instance of Tk , the button is in the root window and thus can't be used as a child of the canvas which is in the second window.

The solution is to use Toplevel for the second window, and to make sure the button is a descendant of the second window and/or the canvas.