IOError：[Errno 22]无效模式（'rb'）或文件名：''Tkinter回调中的异常

Question

我们正在尝试从Windows中的资源管理器窗口获取文件路径，但是当我们运行我们的类来使用文件路径时，它会因错误而崩溃：

IOError: [Errno 22] invalid mode ('rb') or filename: ''Exception in Tkinter callback

我认为错误与我们存储文件路径的方式有关

这是我们的代码：

import Tkinter
from Tkinter import Tk, Label, Button
import subprocess
import sys
import tkFileDialog
import PIL
import matplotlib.pyplot as plt # single use of plt is commented out
import os.path  
import PIL.ImageDraw        
import PIL.Image

bg_size   = [1080,1920]
logo_size = [200,200]
seal_size = [200,200]

wink = ""
wow = ""
seal = 0

class Political_Logo:
    def __init__(self, master):
        self.master = master
        master.title("A simple GUI")

        self.label = Label(master, text="Picture Logo")
        self.label.pack()

        self.label = Label(master, text="Banner")
        self.label.pack()

        self.find_button = Button(master, text="Find Campaign Background", command=self.OpenExplorer)
        self.find_button.pack()

        self.find_button = Button(master, text="Find Campaign Logo", command=self.OpenExplorer1)
        self.find_button.pack()

        self.find_button = Button(master, text="Lets Go", command=lambda: self.test(wow,wink))
        self.find_button.pack()

    def OpenExplorer(self):
        def main():

            Tkinter.Tk().withdraw() # Close the root window
            in_path = tkFileDialog.askopenfilename()
            wow = in_path
            print wow , "\n"
        if __name__ == "__main__":
            main()
    def OpenExplorer1(self):
        def main():

            Tkinter.Tk().withdraw() # Close the root window
            in_path1 = tkFileDialog.askopenfilename()
            wink = in_path1
            print wink , "\n"

        if __name__ == "__main__":
            main()

    def find_filename(substring, self):
        import os
        import re
        files = os.listdir(os.getcwd())
        for file in files:
            search = re.search(substring, file)
            if search:
                filename = file
                break
        return filename



    def test(main_image, logo_image, self):
        logo_image = PIL.Image.open(logo_image, 'r')
        main_image = PIL.Image.open(main_image, 'r')
        img_w, img_h = main_image.size

        if seal == 0:
            print("We converting a banner its lit")
            offset = (0,780)
            main_image.paste(logo_image, offset)
            main_image.save('out.png')
            main_image.show()
        else:
            logo_image.resize(seal_size)
            offset = (0,600)
            print("We are converting a seal over here")



root = Tk()
my_gui = Political_Logo(root)
root.mainloop()

这是我们的堆栈跟踪：

File "C:\Users\XXX\Desktop\1.4.7-Project\GUI.py", line 41, in <lambda>
    self.find_button = Button(master, text="Lets Go", command=lambda: self.test(wow,wink))
  File "C:\Users\XXX\Desktop\1.4.7-Project\GUI.py", line 69, in test
    logo_image = PIL.Image.open(wow, 'r')
  File "C:\Users\XXX\Desktop\User\lib\site-packages\PIL\Image.py", line 2288, in open
    fp = builtins.open(fp, "rb")
IOError: [Errno 22] invalid mode ('rb') or filename: ''
Exception in Tkinter callback