python3的wxpython界面模擬登錄爬取教務系統成績

前言

今天就寫寫在之前用模擬登錄爬取教務系統的成績單的代碼基礎上，用wxpython來做一個可視化的操作界面，用的工具依然是selenium庫，beautifulsoup4庫，還有設計界面的wx，和表格wx.grid,後面兩個只要下載wxpython庫即可

首先是界面操作

裏面的分別對應的文本，按鈕，背景圖片，圖標都有標明

#繼承wx庫裏面的Frame類來使用
class myFrame(wx.Frame):
    def __init__(self):
    	#設置窗口布局的整體大小。座標位置
        wx.Frame.__init__(self, None, -1, 'ZSC-學生查詢系統', pos=(100, 100), size=(1400, 600))
        self.MaxSize = self.Size
        self.MinSize = self.Size
        panel = wx.Panel(self, -1)
        #創造佈局，爲左佈局，右佈局，以及整體佈局
        sizer = wx.BoxSizer(wx.HORIZONTAL)
        sizer1 = wx.BoxSizer(wx.VERTICAL)
        sizer3 = wx.BoxSizer(wx.VERTICAL)
        #設置各個佈局的格式大小
        font = wx.Font(15, wx.ROMAN, wx.NORMAL, wx.BOLD)

        #設置窗口以及托盤圖標
        icon = wx.Icon()
        icon.CopyFromBitmap(wx.Bitmap(wx.Image(("E:\py\系統圖片\zsc.jpg"), wx.BITMAP_TYPE_JPEG)))
        self.SetIcon(icon)

        #設置左邊背景學院logo
        image = wx.Image("E:\py\系統圖片\中山學院.png", wx.BITMAP_TYPE_PNG).ConvertToBitmap()
        self.background = wx.StaticBitmap(panel, -1, bitmap=image,style=wx.ALIGN_CENTER)
        sizer1.Add(self.background,proportion=10,flag= wx.ALIGN_CENTER_VERTICAL, border=10)

        #設置靜態‘用戶名'
        self.text1 = wx.StaticText(panel, -1, '用戶名：', style=wx.ALIGN_CENTER)
        self.text1.SetFont(font)
        sizer1.Add(self.text1, proportion=2, flag=wx.LEFT | wx.ALIGN_CENTER_VERTICAL, border=10)

        #用戶名輸入框
        self.text2 = wx.TextCtrl(panel, -1, size=(200, -1), style=wx.TE_LEFT)
        self.text2.SetFont(font)
        sizer1.Add(self.text2, proportion=0, flag=wx.ALIGN_CENTER | wx.EXPAND, border=15)

        #設置靜態'密碼'
        self.text3 = wx.StaticText(panel, -1, '密碼：', style=wx.ALIGN_CENTER)
        self.text3.SetFont(font)
        sizer1.Add(self.text3, proportion=2, flag=wx.LEFT | wx.ALIGN_CENTER_VERTICAL, border=10)

        #密碼輸入框
        self.text4 = wx.TextCtrl(panel, -1, size=(200, -1), style=wx.TE_LEFT|wx.TE_PASSWORD|wx.TE_PROCESS_ENTER)
        self.text4.SetFont(font)
        sizer1.Add(self.text4, proportion=0, flag=wx.ALIGN_CENTER | wx.EXPAND, border=15)

        # 設置登錄教務系統按鈕
        self.command1 = wx.Button(panel, -1, '→登錄教務系統')
        self.command1.SetFont(font)
        self.command1.SetBackgroundColour('#3299CC')
        sizer1.Add(self.command1, proportion=5, flag=wx.ALIGN_CENTER | wx.EXPAND, border=10)

        #設置登錄素拓分系統按鈕
        self.command3 = wx.Button(panel, -1, '→登錄素拓分系統')
        self.command3.SetFont(font)
        self.command3.SetBackgroundColour('#32CC32')
        sizer1.Add(self.command3, proportion=5, flag=wx.ALIGN_CENTER | wx.EXPAND, border=10)

        #設置重置按鈕
        self.command2 = wx.Button(panel, -1, '→重置輸入框')
        self.command2.SetFont(font)
        self.command2.SetBackgroundColour((random.randint(1, 255), random.randint(0, 255), random.randint(0, 255)))
        sizer1.Add(self.command2, proportion=5, flag=wx.ALIGN_CENTER | wx.EXPAND, border=10)

        #設置消息提示文本
        self.text5 = wx.StaticText(panel, -1, '\n\n', style=wx.ALIGN_CENTER)
        self.text5.SetFont(font)
        self.text5.SetForegroundColour('Red')
        sizer1.Add(self.text5, proportion=15, flag=wx.LEFT | wx.ALIGN_CENTER_VERTICAL, border=10)

        #設置個人信息文本
        self.text6 = wx.StaticText(panel, -1, '姓名：')
        self.text7 = wx.StaticText(panel, -1, '學號：')
        self.text8 = wx.StaticText(panel, -1, '學院：')
        sizer1.Add(self.text6, proportion=3, flag=wx.LEFT, border=0)
        sizer1.Add(self.text7, proportion=3, flag=wx.LEFT, border=0)
        sizer1.Add(self.text8, proportion=3, flag=wx.LEFT, border=0)

        #把分佈局全部加入整體頂級佈局
        sizer.Add(sizer1, flag=wx.EXPAND | wx.ALL, border=20)
        sizer.Add(sizer3, flag=wx.EXPAND | wx.ALL, border=20)
        self.grid = mygrid(panel)
        sizer.Add(self.grid, proportion=1, flag=wx.EXPAND | wx.ALL, border=25)

        self.grid.SetSize((200, 400))

        panel.SetSizer(sizer)

        #三個按鈕對應的事件
        self.command1.Bind(wx.EVT_BUTTON, self.command1_event)
        self.command3.Bind(wx.EVT_BUTTON, self.command3_event)
        self.command2.Bind(wx.EVT_BUTTON, self.command2_event)

        self.Show()
        
#三個按鈕對應的響應事件函數
    def command1_event(self, event):
    #每次按鈕第一步是初始化
        self.text6.SetLabel('姓名：')
        self.text7.SetLabel('學號：')
        self.text8.SetLabel('學院：')
        self.grid.ff()
        self.grid.Update()
        self.text5.SetLabel(u'\n溫馨提示：\n' + '⚪登錄信息驗證中...')
        self.text5.Update()
        try:
        #獲取文本輸入框的賬號密碼
            name = self.text2.GetValue()
            password = self.text4.GetValue()
            #調用模擬登錄爬蟲來爬取數據 get_data_from_zsc就是自己構造的類，用來爬取數據
            courses = get_data_from_zsc(name,password)
            if courses.result == False:
                self.text5.SetLabel(u'\n溫馨提示：\n' + '×用戶名或密碼錯誤！' )
            else:
                student_course = courses.my_score_list
                self.text5.SetLabel(u'\n溫馨提示：\n' + '√登錄成功並獲得成績！')
                self.text6.SetLabel('姓名：' + courses.my_information[0])
                self.text7.SetLabel('學號：' + courses.my_information[1])
                self.text8.SetLabel('學院：' + courses.my_information[2] )
                try:
                    self.grid.header = grade
                    for i in range(len(self.grid.header)):
                        self.grid.SetColLabelValue(i, self.grid.header[i])
                    self.grid.Update()
                    self.grid.Refresh()
                except:
                    pass
                #計算列表大小
                n1 = len(student_course)
                n2 = len(student_course[0])
                self.grid.InsertRows(0, n1)
                #在grid表格對應的每行每列輸入數據
                for i in range(0, n1):
                    for j in range(0, n2):
                        self.grid.SetCellValue(i, j, student_course[i][j])
        except:
            self.Message = wx.MessageDialog(self, '賬號或密碼不能爲空！', 'ERROR',wx.ICON_ERROR)
            self.Message.ShowModal()
            self.Message.Destroy()

    def command3_event(self, event):
        self.Message = wx.MessageDialog(self, '對不起，此功能暫時未開放！', 'ERROR', wx.ICON_ERROR)
        self.Message.ShowModal()
        self.Message.Destroy()
    #重置數據函數，相當於數據清理，退出登錄
    def command2_event(self, event):
    
        self.text2.SetValue('')
        self.text4.SetValue('')
        self.text5.SetLabel('\n\n')
        self.text6.SetLabel('姓名：')
        self.text7.SetLabel('學號：')
        self.text8.SetLabel('學院：')
        self.grid.ff()
        self.grid.Update()

具體的界面各方面從設置佈局開始，分爲兩個佈局。一個是登錄界面佈局

另一個是獲取的數據用wx.grid表格來可視化

然後是模擬登錄獲取數據的爬蟲

具體的操作就不說了，之前的博文關於模擬登錄教務系統有細說了，
此爬蟲類主要是爬取學生姓名，學院，學號，以及成績單

class get_data_from_zsc():
    def __init__(self, userAccount, password):
        driver_path = r'E:\py\chromedriver\chromedriver.exe'
        chrome_options = Options()
        chrome_options.add_argument('--headless')
        chrome_options.add_argument('--disable-gpu')

        driver = webdriver.Chrome(executable_path=driver_path, chrome_options=chrome_options)

        driver.get('http://jwgln.zsc.edu.cn/jsxsd/')
        driver.implicitly_wait(1)
        driver.find_element_by_id("userAccount").send_keys(userAccount)
        driver.find_element_by_id("userPassword").send_keys(password)
        driver.find_element_by_xpath('//*[@id="btnSubmit"]').click()  # 用click模擬瀏覽器點擊
        driver.implicitly_wait(1)
        self.my_information = []
        self.my_score_list = []
        self.result = self.if_or_get_data(driver)
    def if_or_get_data(self,driver):
        if '用戶名或密碼錯誤' in driver.page_source:
            driver.close()
            driver.quit()
            return False
        else:
            driver1 = self.get_course1(driver)
            self.get_course2(driver1)
            return True
    def get_course1(self,driver):
        #獲取姓名，學號
        bs = BeautifulSoup(driver.page_source, 'lxml')
        information = list(bs.find('div',attrs ={'class':"block1text"}))
        self.my_information.append(information[0].split("：")[1])
        self.my_information.append(information[2].split("：")[1])
        #獲取成績
        driver.find_element_by_xpath('//*[@class="block7"]').click()
        driver.implicitly_wait(1)
        driver.find_element_by_xpath('//*[@id="btn_query"]').click()
        bs = BeautifulSoup(driver.page_source, 'lxml')
        my_score_detail = bs.find_all(name='td')[1:]
        my_score_detail = list(my_score_detail)
        score_list = [i.string for i in my_score_detail]
        for i in range(0, len(score_list), 14):
            course_list = []
            for j in range(i+1, i + 14):
                if score_list[j]== None:
                    course_list.append('\n')
                else:
                    course_list.append(score_list[j])
            self.my_score_list.append(course_list)
        return  driver
    #獲得學院
    def get_course2(self, driver):
        driver.find_element_by_xpath('//*[@title="培養管理"]').click()
        driver.implicitly_wait(1)
        driver.find_element_by_xpath('//*[@href="/jsxsd/pyfa/pyfa_query"]').click()
        # 用bs4進行數據篩選
        bs = BeautifulSoup(driver.page_source, 'lxml')
        my_score_detail = bs.find_all(name='td', attrs={'align': "left"})
        my_score_detail = list(my_score_detail)
        my_score_list = [i.string for i in my_score_detail]
        Map = dict()
        for i in range(len(my_score_list)):
            if i % 4 == 3:
                if my_score_list[i] not in Map.keys():
                    Map[my_score_list[i]] = 0
                else:
                    Map[my_score_list[i]] = Map[my_score_list[i]] + 1
        college = max(Map.keys(), key=(lambda x: Map[x]))
        self.my_information.append(college)
        driver.close()
        driver.quit()

最後是wx.grid的表格類

依舊是繼承wx.grid.Grid，來重構類

class mygrid(wx.grid.Grid):
    def __init__(self, parent):
        wx.grid.Grid.__init__(self, parent=parent, id=-1)
        #self.CreateGrid(0, 7)
        self.SetDefaultCellBackgroundColour('#BFD8D8')#parent.BackgroundColour
        self.SetDefaultCellTextColour("#000000")
        self.CreateGrid(0, 13) #設置初始化時的行數和列數
        #爲列定義初始化名字
        for i in range(13):
            self.SetColLabelValue(i,'列名')
        self.header = []
     #初始化函數，作用跟上面差不多
    def ff(self):
        self.ClearGrid() #清除表格數據
        if self.GetNumberRows()>0:
            self.DeleteRows(0, self.GetNumberRows()) #刪除所有行
        #self.DeleteCols(0, self.GetNumberCols())
        for i in range(13):
            self.SetColLabelValue(i, '列名')
        self.Update()
        self.Refresh()
        self.header = []

當然，要奉上圖片資源

這個是背景logo，即是‘中山學院.png’ 下載後更改儲存圖片的地址即可，圖標資源就不提供了，太大了，就是圓標校徽

整體爬取成功的界面樣子

最後的最後，奉上所有代碼

將chromedriver.exe的存儲位置改好，對應的庫下載好，圖片資源最好下載設置後位置，不弄的話將對應的設置圖片代碼行註釋掉，應該也可以運行，只是會缺少相應的圖片

# -*-coding:utf-8-*-
'''
@author Himit_ZH
Date:2020.01.20
'''
from selenium import webdriver # 從selenium導入webdriver
from selenium.webdriver.chrome.options import Options
from bs4 import BeautifulSoup
import wx
import wx.grid
import random
import time


sutuo = ['活動名稱', '獲得學分', '班級審覈狀態', '院系審覈狀態', '學校審覈狀態', '審覈截止日期', '申報成功']
grade = ['開課學期', '課程編號', '課程名稱', '總成績', '學分',
                  '平時成績', '期中成績', '實驗成績', '期末成績', '課程屬性',
                  '課程性質', '備註', '考試性質']
class myFrame(wx.Frame):
    def __init__(self):
        wx.Frame.__init__(self, None, -1, 'ZSC-學生查詢系統', pos=(100, 100), size=(1400, 600))
        self.MaxSize = self.Size
        self.MinSize = self.Size
        panel = wx.Panel(self, -1)
        sizer = wx.BoxSizer(wx.HORIZONTAL)
        sizer1 = wx.BoxSizer(wx.VERTICAL)
        sizer3 = wx.BoxSizer(wx.VERTICAL)
        font = wx.Font(15, wx.ROMAN, wx.NORMAL, wx.BOLD)

        #設置窗口以及托盤圖標
        icon = wx.Icon()
        icon.CopyFromBitmap(wx.Bitmap(wx.Image(("E:\py\系統圖片\zsc.jpg"), wx.BITMAP_TYPE_JPEG)))
        self.SetIcon(icon)

        #設置左邊背景學院logo
        image = wx.Image("E:\py\系統圖片\中山學院.png", wx.BITMAP_TYPE_PNG).ConvertToBitmap()
        self.background = wx.StaticBitmap(panel, -1, bitmap=image,style=wx.ALIGN_CENTER)
        sizer1.Add(self.background,proportion=10,flag= wx.ALIGN_CENTER_VERTICAL, border=10)

        #設置靜態‘用戶名'
        self.text1 = wx.StaticText(panel, -1, '用戶名：', style=wx.ALIGN_CENTER)
        self.text1.SetFont(font)
        sizer1.Add(self.text1, proportion=2, flag=wx.LEFT | wx.ALIGN_CENTER_VERTICAL, border=10)

        #用戶名輸入框
        self.text2 = wx.TextCtrl(panel, -1, size=(200, -1), style=wx.TE_LEFT)
        self.text2.SetFont(font)
        sizer1.Add(self.text2, proportion=0, flag=wx.ALIGN_CENTER | wx.EXPAND, border=15)

        #設置靜態'密碼'
        self.text3 = wx.StaticText(panel, -1, '密碼：', style=wx.ALIGN_CENTER)
        self.text3.SetFont(font)
        sizer1.Add(self.text3, proportion=2, flag=wx.LEFT | wx.ALIGN_CENTER_VERTICAL, border=10)

        #密碼輸入框
        self.text4 = wx.TextCtrl(panel, -1, size=(200, -1), style=wx.TE_LEFT|wx.TE_PASSWORD|wx.TE_PROCESS_ENTER)
        self.text4.SetFont(font)
        sizer1.Add(self.text4, proportion=0, flag=wx.ALIGN_CENTER | wx.EXPAND, border=15)

        # 設置登錄教務系統按鈕
        self.command1 = wx.Button(panel, -1, '→登錄教務系統')
        self.command1.SetFont(font)
        self.command1.SetBackgroundColour('#3299CC')
        sizer1.Add(self.command1, proportion=5, flag=wx.ALIGN_CENTER | wx.EXPAND, border=10)

        #設置登錄素拓分系統按鈕
        self.command3 = wx.Button(panel, -1, '→登錄素拓分系統')
        self.command3.SetFont(font)
        self.command3.SetBackgroundColour('#32CC32')
        sizer1.Add(self.command3, proportion=5, flag=wx.ALIGN_CENTER | wx.EXPAND, border=10)

        #設置重置按鈕
        self.command2 = wx.Button(panel, -1, '→重置輸入框')
        self.command2.SetFont(font)
        self.command2.SetBackgroundColour((random.randint(1, 255), random.randint(0, 255), random.randint(0, 255)))
        sizer1.Add(self.command2, proportion=5, flag=wx.ALIGN_CENTER | wx.EXPAND, border=10)

        #設置消息提示文本
        self.text5 = wx.StaticText(panel, -1, '\n\n', style=wx.ALIGN_CENTER)
        self.text5.SetFont(font)
        self.text5.SetForegroundColour('Red')
        sizer1.Add(self.text5, proportion=15, flag=wx.LEFT | wx.ALIGN_CENTER_VERTICAL, border=10)

        #設置個人信息文本
        self.text6 = wx.StaticText(panel, -1, '姓名：')
        self.text7 = wx.StaticText(panel, -1, '學號：')
        self.text8 = wx.StaticText(panel, -1, '學院：')
        sizer1.Add(self.text6, proportion=3, flag=wx.LEFT, border=0)
        sizer1.Add(self.text7, proportion=3, flag=wx.LEFT, border=0)
        sizer1.Add(self.text8, proportion=3, flag=wx.LEFT, border=0)

        #把分佈局全部加入整體頂級佈局
        sizer.Add(sizer1, flag=wx.EXPAND | wx.ALL, border=20)
        sizer.Add(sizer3, flag=wx.EXPAND | wx.ALL, border=20)
        self.grid = mygrid(panel)
        sizer.Add(self.grid, proportion=1, flag=wx.EXPAND | wx.ALL, border=25)

        self.grid.SetSize((200, 400))

        panel.SetSizer(sizer)

        #三個按鈕對應的事件
        self.command1.Bind(wx.EVT_BUTTON, self.command1_event)
        self.command3.Bind(wx.EVT_BUTTON, self.command3_event)
        self.command2.Bind(wx.EVT_BUTTON, self.command2_event)

        self.Show()

    def command1_event(self, event):
        self.text6.SetLabel('姓名：')
        self.text7.SetLabel('學號：')
        self.text8.SetLabel('學院：')
        self.grid.ff()
        self.grid.Update()
        self.text5.SetLabel(u'\n溫馨提示：\n' + '⚪登錄信息驗證中...')
        self.text5.Update()
        try:
            name = self.text2.GetValue()
            password = self.text4.GetValue()
            courses = get_data_from_zsc(name,password)
            if courses.result == False:
                self.text5.SetLabel(u'\n溫馨提示：\n' + '×用戶名或密碼錯誤！' )
            else:
                student_course = courses.my_score_list
                self.text5.SetLabel(u'\n溫馨提示：\n' + '√登錄成功並獲得成績！')
                self.text6.SetLabel('姓名：' + courses.my_information[0])
                self.text7.SetLabel('學號：' + courses.my_information[1])
                self.text8.SetLabel('學院：' + courses.my_information[2] )
                try:
                    self.grid.header = grade
                    for i in range(len(self.grid.header)):
                        self.grid.SetColLabelValue(i, self.grid.header[i])
                    self.grid.Update()
                    self.grid.Refresh()
                except:
                    pass
                n1 = len(student_course)
                n2 = len(student_course[0])
                self.grid.InsertRows(0, n1)
                for i in range(0, n1):
                    for j in range(0, n2):
                        self.grid.SetCellValue(i, j, student_course[i][j])
        except:
            self.Message = wx.MessageDialog(self, '賬號或密碼不能爲空！', 'ERROR',wx.ICON_ERROR)
            self.Message.ShowModal()
            self.Message.Destroy()

    def command3_event(self, event):
        self.Message = wx.MessageDialog(self, '對不起，此功能暫時未開放！', 'ERROR', wx.ICON_ERROR)
        self.Message.ShowModal()
        self.Message.Destroy()
    def command2_event(self, event):
        self.text2.SetValue('')
        self.text4.SetValue('')
        self.text5.SetLabel('\n\n')
        self.text6.SetLabel('姓名：')
        self.text7.SetLabel('學號：')
        self.text8.SetLabel('學院：')
        self.grid.ff()
        self.grid.Update()

class mygrid(wx.grid.Grid):
    def __init__(self, parent):
        wx.grid.Grid.__init__(self, parent=parent, id=-1)
        #self.CreateGrid(0, 7)
        self.SetDefaultCellBackgroundColour('#BFD8D8')#parent.BackgroundColour
        self.SetDefaultCellTextColour("#000000")
        self.CreateGrid(0, 13)
        for i in range(13):
            self.SetColLabelValue(i,'列名')
        self.header = []
    def ff(self):
        self.ClearGrid()
        if self.GetNumberRows()>0:
            self.DeleteRows(0, self.GetNumberRows())
        #self.DeleteCols(0, self.GetNumberCols())
        for i in range(13):
            self.SetColLabelValue(i, '列名')
        self.Update()
        self.Refresh()
        self.header = []


class get_data_from_zsc():
    def __init__(self, userAccount, password):
        driver_path = r'E:\py\chromedriver\chromedriver.exe'
        chrome_options = Options()
        chrome_options.add_argument('--headless')
        chrome_options.add_argument('--disable-gpu')

        driver = webdriver.Chrome(executable_path=driver_path, chrome_options=chrome_options)

        driver.get('http://jwgln.zsc.edu.cn/jsxsd/')
        driver.implicitly_wait(1)
        driver.find_element_by_id("userAccount").send_keys(userAccount)
        driver.find_element_by_id("userPassword").send_keys(password)
        driver.find_element_by_xpath('//*[@id="btnSubmit"]').click()  # 用click模擬瀏覽器點擊
        driver.implicitly_wait(1)
        self.my_information = []
        self.my_score_list = []
        self.result = self.if_or_get_data(driver)
    def if_or_get_data(self,driver):
        if '用戶名或密碼錯誤' in driver.page_source:
            driver.close()
            driver.quit()
            return False
        else:
            driver1 = self.get_course1(driver)
            self.get_course2(driver1)
            return True
    def get_course1(self,driver):
        #獲取姓名，學號
        bs = BeautifulSoup(driver.page_source, 'lxml')
        information = list(bs.find('div',attrs ={'class':"block1text"}))
        self.my_information.append(information[0].split("：")[1])
        self.my_information.append(information[2].split("：")[1])
        #獲取成績
        driver.find_element_by_xpath('//*[@class="block7"]').click()
        driver.implicitly_wait(1)
        driver.find_element_by_xpath('//*[@id="btn_query"]').click()
        bs = BeautifulSoup(driver.page_source, 'lxml')
        my_score_detail = bs.find_all(name='td')[1:]
        my_score_detail = list(my_score_detail)
        score_list = [i.string for i in my_score_detail]
        for i in range(0, len(score_list), 14):
            course_list = []
            for j in range(i+1, i + 14):
                if score_list[j]== None:
                    course_list.append('\n')
                else:
                    course_list.append(score_list[j])
            self.my_score_list.append(course_list)
        return  driver
    #獲得學院
    def get_course2(self, driver):
        driver.find_element_by_xpath('//*[@title="培養管理"]').click()
        driver.implicitly_wait(1)
        driver.find_element_by_xpath('//*[@href="/jsxsd/pyfa/pyfa_query"]').click()
        # 用bs4進行數據篩選
        bs = BeautifulSoup(driver.page_source, 'lxml')
        my_score_detail = bs.find_all(name='td', attrs={'align': "left"})
        my_score_detail = list(my_score_detail)
        my_score_list = [i.string for i in my_score_detail]
        Map = dict()
        for i in range(len(my_score_list)):
            if i % 4 == 3:
                if my_score_list[i] not in Map.keys():
                    Map[my_score_list[i]] = 0
                else:
                    Map[my_score_list[i]] = Map[my_score_list[i]] + 1
        college = max(Map.keys(), key=(lambda x: Map[x]))
        self.my_information.append(college)
        driver.close()
        driver.quit()
if __name__ == '__main__':
    app = wx.App()
    frame = myFrame()
    app.MainLoop()