Tkinter（十二）：用Tkinter實現一個登陸窗口

 本節是Tkinter系列的最后一節，是一個綜合性的小實踐項目。

感謝莫煩大佬的教程，跟着他的教程一節一節的看過來的。大家可以百度能搜索到。

 

這個小項目是個典型的登錄窗口，其中包含了前面章節的很多知識點

比如canvas，Label，Entry等等，效果如圖，點擊Login和Sign up都會有對應的響應函數，大家可以試一試

代碼如下，其中需要注意的幾點

1.引入了pickle庫，這個是python的自帶庫，不需要另外的安裝，可以用來存儲數據

2.點擊Sign up，主窗口彈出了次級窗口 window_sign_up = tk.Toplevel(window)

import tkinter as tk
import pickle
import tkinter.messagebox

# 定義窗口
window = tk.Tk()
window.title('Welcome to my Tkinter Test')  # 窗口title
window.geometry('450x300')  # 窗口尺寸

# welcome image
canvas = tk.Canvas(window, height=200, width=500)
image_file = tk.PhotoImage(file='welcome.gif')
image = canvas.create_image(0, 0, anchor='nw', image=image_file)
canvas.pack(side='top')

# user infomation - Label
tk.Label(window, text='User name').place(x=50, y=150)
tk.Label(window, text='Password').place(x=50, y=190)

# user infomation - Entry
var_user_name = tk.StringVar()
var_user_name.set('[e-mail]')
var_user_pwd = tk.StringVar()

entry_user_name = tk.Entry(window, textvariable=var_user_name)
entry_user_name.place(x=160, y=150)
entry_user_pwd = tk.Entry(window, textvariable=var_user_pwd, show='*')
entry_user_pwd.place(x=160, y=190)

# Login and singn up button
'''
Login部分
'''


def user_login():
    user_name = entry_user_name.get()
    user_pwd = entry_user_pwd.get()

    # 第一次訪問時，文件肯定是不存在的，所以設置異常捕獲
    # 沒有讀取到文件時，創建一個文件，並將管理員用戶密碼寫入
    try:
        with open('users_info.pickle', 'rb') as user_file:
            user_info = pickle.load(user_file)
    except FileNotFoundError:
        with open('users_info.pickle', 'wb') as user_file:
            user_info = {'admin': 'admin'}
            pickle.dump(user_info, user_file)

    # 判斷user_name是否在user_info里面
    if user_name in user_info:
        # 如果在，則判斷密碼是否正確，正確則進入系統，不正確則提示密碼錯誤
        if user_pwd == user_info[user_name]:
            tk.messagebox.showinfo(title='welcome', message='How are you? ' + user_name)
        else:
            tk.messagebox.showerror(message="Error,your password is wrong,try again")
    # user_name不在user_info里面，則提示注冊
    else:
        is_sign_up = tk.messagebox.askyesno(title='Welcome', message='You have not sign up yet. Sign up today?')
        if is_sign_up == True:
            user_sign_up()
        else:
            tk.messagebox.showinfo(title='Bye', message='Bye~~')


'''
sign up部分
'''


def user_sign_up():
    def sign_to_system():
        # 從signup窗口取出值
        np = new_pwd.get()
        npf = new_pwd_confirm.get()
        nn = new_name.get()

        with open('users_info.pickle', 'rb') as user_file:
            exist_user_info = pickle.load(user_file)

        # 判斷兩次密碼是否一致
        if np != npf:
            tk.messagebox.showerror(title='Eorror', message='兩次密碼輸入不一致')
        # 判斷用戶名是否存在
        elif nn in exist_user_info:
            tk.messagebox.showerror(title='Error', message='用戶名已存在')
        # 將用戶名密碼寫入文件，並存在user_file中
        else:
            exist_user_info[nn] = np
            with open('users_info.pickle', 'wb') as user_file:
                pickle.dump(exist_user_info, user_file)
            tk.messagebox.showinfo(title='Congratulations', message='注冊成功')
        # 銷毀窗口
        window_sign_up.destroy()

    # 在主窗口下定義次級窗口
    window_sign_up = tk.Toplevel(window)
    window_sign_up.geometry('350x200')
    window_sign_up.title('Sign up window')
    # 定義Label
    tk.Label(window_sign_up, text='User name:').place(x=10, y=10)
    # 定義entry - name
    new_name = tk.StringVar()
    new_name.set('[e-mail]')
    entry_new_name = tk.Entry(window_sign_up, textvariable=new_name)
    entry_new_name.place(x=150, y=10)
    # 定於 entry - pwd
    new_pwd = tk.StringVar()
    tk.Label(window_sign_up, text='Password').place(x=10, y=50)
    entry_new_pwd = tk.Entry(window_sign_up, textvariable=new_pwd, show='*')
    entry_new_pwd.place(x=150, y=50)
    # 定於 entry - pwd - confirm
    new_pwd_confirm = tk.StringVar()
    tk.Label(window_sign_up, text='Confirm Password').place(x=10, y=90)
    new_pwd_confirm = tk.Entry(window_sign_up, textvariable=new_pwd_confirm, show='*')
    new_pwd_confirm.place(x=150, y=90)

    # 定義Button
    btn_confirm_sign_up = tk.Button(window_sign_up, text='Sign up', command=sign_to_system)
    btn_confirm_sign_up.place(x=150, y=130)


btn_login = tk.Button(window, text='Login', command=user_login)
btn_login.place(x=170, y=230)
btn_sign_up = tk.Button(window, text='Sign up', command=user_sign_up)
btn_sign_up.place(x=270, y=230)

window.mainloop()