使用pyqt5，成功转写linux日志拉取小工具客户端

https://blog.youkuaiyun.com/qq_36711094/article/details/110474759
这是上一篇日志拉取小工具的文章

之前使用的是win的cmd窗口操作，这次使用qt5构建界面，增强了可移植性，还是话不多说，直接上代码，注释不清晰的，可以私信作者
本文是在大佬示例代码基础上修改的，送上大佬主页
https://blog.youkuaiyun.com/seniorwizard
另，老生常谈，******可以自由替换

主页面py文件

# -*- coding: utf-8 -*-

# Form implementation generated from reading ui file 'Form.ui'
#
# Created by: PyQt5 UI code generator 5.10.1
#
# WARNING! All changes made in this file will be lost!
#要注意的是跳转界面第二个必须使用QDialog类，不能使用QWidget，我也不知道为什么，特别注意
from PyQt5 import QtCore, QtGui, QtWidgets
from PyQt5.QtWidgets import (QMainWindow, QApplication,QLabel,QLineEdit,QMessageBox,QComboBox)
from PyQt5.QtCore import Qt, QSize
import Dialog1
import Dialog2
import sys


class Ui_Form(object):  #这是用PyQt Designer生成的代码，很简单的，拖动控件，生成ui文件，然后UIC转换成py文件
    def setupUi(self, Form):
        Form.setObjectName("Form")
        Form.resize(440, 310)
        self.form = Form
        self.btn_d1 = QtWidgets.QPushButton(Form)
        self.btn_d1.setGeometry(QtCore.QRect(60, 240, 75, 23))
        self.btn_d1.setObjectName("btn_d1")
        self.btn_d2 = QtWidgets.QPushButton(Form)
        self.btn_d2.setGeometry(QtCore.QRect(180, 240, 75, 23))
        self.btn_d2.setObjectName("btn_d2")
        self.btn_exit = QtWidgets.QPushButton(Form)
        self.btn_exit.setGeometry(QtCore.QRect(300, 240, 75, 23))
        self.btn_exit.setObjectName("btn_exit")
        #用户名lab
        self.label_username = QtWidgets.QLabel(Form)
        self.label_username.setGeometry(QtCore.QRect(60, 60, 75, 23))
        self.label_username.setObjectName("label_username")
        #密码lab
        self.label_password = QtWidgets.QLabel(Form)
        self.label_password.setGeometry(QtCore.QRect(60, 100, 75, 23))
        self.label_password.setObjectName("label_username")
        # 用户名edit
        self.le_username = QtWidgets.QLineEdit(Form)
        self.le_username.setGeometry(QtCore.QRect(140, 60, 180, 23))
        self.le_username.setObjectName("le_username")
        # 密码edit
        self.le_password = QtWidgets.QLineEdit(Form)
        self.le_password.setEchoMode(QLineEdit.Password)  # 输入显示为圆点
        self.le_password.setGeometry(QtCore.QRect(140, 100, 180, 23))
        self.le_password.setObjectName("le_username")
        self.retranslateUi(Form)
        QtCore.QMetaObject.connectSlotsByName(Form)

    def retranslateUi(self, Form):
        _translate = QtCore.QCoreApplication.translate
        Form.setWindowTitle(_translate("Form", "登录"))
        self.btn_d1.setText(_translate("Form", "历史连接"))
        self.btn_d1.clicked.connect(self.jump_to_demo1)
        self.btn_d2.setText(_translate("Form", "新建连接"))
        self.btn_d2.clicked.connect(self.jump_to_demo2)
        self.btn_exit.setText(_translate("Form", "退出"))
        self.btn_exit.clicked.connect(self.exit)
        self.label_username.setText(_translate("Form", "用户名"))
        self.label_password.setText(_translate("Form", "密码"))
        self.le_username.setPlaceholderText("请输入用户名")
        self.le_password.setPlaceholderText("请输入密码")





    def jump_to_demo1(self):
        #测试逻辑代码
        if self.le_username.text() != "1":
            #self.le_username很重要，不加.le_username会报错，寻不到默认self
            QtWidgets.QMessageBox.information(self.le_username, "提示信息", "用户名错误")
        elif self.le_password.text() != "1":
            QMes