def loginCheck(self):
        name = self.username.get()
        password = self.password.get()
        useSSL = self.useSSL.get()
        if useSSL:
            client = client_socket_ssl.client_ssl()
        else:
            client = client_socket_no_ssl.client_no_ssl()
            pass

        loginStat = client.login(name, password)

        # 用户名密码不能为空
        if name == '' or password == '':
            showerror(message='用户名或密码为空')
        else:
            # 判断用户名和密码是否匹配
            if loginStat:
                #showinfo(title='welcome',message='欢迎您:' + name)
                #记录用户名和密码
                client.username = name
                client.password = password
                self.page.destroy()
                MainPage(self.root, client)
            else:
                showerror(message='用户名或密码错误')
        def signtowcg():
            # 获取输入框内的内容
            nn = new_name.get()
            np = new_pwd.get()
            npf = new_pwd_confirm.get()

            if np == '' or nn == '':
                showerror('错误', '用户名或密码为空')
            elif np != npf:
                showerror('错误', '密码前后不一致')

            else:
                client = client_socket_ssl.client_ssl()
                stat = client.register(nn, np)
                if stat:
                    showinfo('欢迎', '注册成功')
                    # 注册成功关闭注册框
                    window_sign_up.destroy()
                else:
                    showerror('错误', '用户名已存在')