如何将 tkinter 结果存储到变量并在切换帧时跨类使用它（销毁前一帧）？ [复制]

Question

我正在尝试构建模拟软件安装页面的软件。第一页会询问安装目录。并且当点击“下一步”按钮时，框架切换到另一个页面（不确定上一个框架是否被破坏）-但是，用户选择的安装目录仍然存储在变量中并且可以访问。

我的代码有问题，我无法访问 def 和 class 之外的变量。我结合了来自不同来源的几个代码。我尝试使用 var.get()、var.set()。全球化——但有些人说让一切全球化不是一个好习惯。如果有人可以提供帮助，请不胜感激。

import tkinter as tk
from tkinter import *
from tkinter import font as tkfont
import os
from PIL import Image, ImageTk
from tkinter import filedialog

class MainPage(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        self._frame = None
        self.switch_frame(StartPage)

    def switch_frame(self, frame_class):
        new_frame = frame_class(self)
        if self._frame is not None:
            self._frame.destroy()
        self._frame = new_frame
        self._frame.pack()

class StartPage(tk.Frame):

    def __init__(self, master):
        tk.Frame.__init__(self, master)

        self.master.title("Starting Point")

        Heading = tkfont.Font(family = 'Helvetica', size = 16, weight = 'bold')

        logo = Image.open("xxx.jpg")
        logo_pic = ImageTk.PhotoImage(logo)

        logo_label = tk.Label(self, image=logo_pic)
        logo_label.image = logo_pic
        logo_label.pack(pady = 30)

        button1 = tk.Button(self, text="Page1", font = Heading, height = 3, width = 15 , command=lambda: master.switch_frame(Page1))
        button1.pack(pady = 10)

        button2 = tk.Button(self, text="Page2", font = Heading, height = 3, width = 15 , command=lambda: master.switch_frame(Page2))
        button2.pack(pady = 10)

        button3 = tk.Button(self, text="Page3", font = Heading, height = 3, width = 15 , command=lambda: master.switch_frame(Page3))
        button3.pack(pady = 10)


class Page1(tk.Frame):

    def __init__(self, master):
        tk.Frame.__init__(self, master)

        self.master.title("Page1")

        Heading = tkfont.Font(family = 'Helvetica', size = 20, weight = 'bold')
        Content = tkfont.Font(family = 'Helvetica', size = 16)

        try:
            outdir = os.makedirs(os.path.join(os.path.expanduser('~')+'/Result/'))
        except:
            pass

        outdir = os.path.join(os.path.expanduser('~')+'/Result/')

        label = tk.Label(self, text="Page1", font= Heading)
        label.pack(pady = 10)

        label1 = tk.Label(self, text="Please select single file or a folder", font = Content)
        label1.pack(pady = 10)

        processing = tk.IntVar()
        processing.set(1)
        #filelist = tk.StringVar()
        #indir = tk.StringVar()
        #OCRdir = tk.StringVar()

        singleButton = tk.Radiobutton(self, text="Single File", variable=processing, value=1, command = self.getFileName)
        singleButton.pack(pady = 10)
        folderButton = tk.Radiobutton(self, text="Folder", variable=processing, value=2, command = self.getDirectory)
        folderButton.pack(pady = 10)

        label2 = tk.Label(self, text="Please set the directory for OCR", font = Content)
        label2.pack(pady = 10)

        OCRButton = tk.Button(self, text="Browse", command = self.getOCRdir)
        OCRButton.pack(pady = 10)

        prevbutton = tk.Button(self, text="Back to Home",
                            command=lambda: master.switch_frame(StartPage))
        prevbutton.pack(side = 'left')

        print(processing)
        print(filelist)
        print(indir)
        print(OCRdir)

        #processbutton = tk.Button(self, text="Next", command=self.Next)
        #processbutton.pack(side = 'right')

    def getFileName(self):
        filename = tk.filedialog.askopenfilename(initialdir = "/", title = 'Please select a file')
        filelist.set(filename)
        if filelist.endswith('.xml') or filelist.endswith('.tif'):
            indir = os.path.splitext(filelist)[0].split('/')[0:len(os.path.splitext(filelist)[0].split('/'))-1]
            indir = '/'.join(indir)
            filelist = [os.path.splitext(filelist)[0].split('/')[-1].upper()]
        else:
            filelist = 0
            indir = 0
        processing.set(1)

    def getDirectory(self):
        directory = tk.filedialog.askdirectory(initialdir="/", title='Please select a directory')
        indir.set(directory)
        files = os.listdir(indir)
        filelist = []

        for filename in files:
            if filename.endswith('.xml') or filename.endswith('.tif'):
                filelist.append(filename)

        filelist = list(set([os.path.splitext(x)[0].split('/')[-1].upper() for x in filelist]))
        processing.set(2)

    def getOCRdir(self):
        OCR = tk.filedialog.askdirectory(initialdir="/", title='Please select a directory')
        OCRdir.set(OCR)
    #def startextract(self):
        #os.system('python Datafile.py')

def main():
    app = MainPage()
    w, h = app.winfo_screenwidth(), app.winfo_screenheight()
    app.geometry("%dx%d+0+0" % (w, h))
    app.mainloop()

if __name__ == '__main__':
    main()

Answer 1

使用全局变量。例如：

 #imports
filepath = ''

#__init__()
global filepath
filepath = 'path/to/file'

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