无法使用 Tkinter GUI 在线程中执行代码

Question

Here is the code it is supposed to scan and enumerate a directory and make hashes of whatever files it finds and append them to a dict the code all works separately but I cant get the hashing part to trigger within the threaded code there is no error

 import threading
 import tkinter as tk
 import tkinter.ttk as ttk
 import hashlib
 import glob


 class global_variables:
     def __init__(self):
         pass
     DirSelected = '' 
     Manifest = []

 class App(tk.Tk):
     def __init__(self):
         super().__init__()
         self.title("Progress bar example")
         self.button = tk.Button(self, text="Start", command=self.start_action)
         self.button.pack(padx=10, pady=10)

     def start_action(self):
         self.button.config(state=tk.DISABLED)

         t = threading.Thread(target=self.contar)
         t.start()

         self.windows_bar = WinProgressBar(self)

     def contar(self):

         directories_scanned = [str, 'File,Md5!']  # , separator value ! delineator adds new line
         target_dir = '/Users/kyle/PycharmProjects/' # this wont run 
         files = glob.glob(target_dir + '/**/*.*', recursive=True)  # Line adds search criteria aka find all all to the
         # directory for GLOB
         for file in files:
             with open(file, "rb") as f:
                 file_hash = hashlib.md5()
                 while chunk := f.read(8192):
                     file_hash.update(chunk)
                 directories_scanned.append(
                     file + ',' + str(file_hash.hexdigest() + '!'))  # Appends the file path and Md5
          global_variables.Manifest = directories_scanned

          for x in range(len(global_variables.DirSelected)):  # testing to view files TODO REMOVE this
             print(global_variables.DirSelected[x])
    
         for i in range(10): #to here 
             print("Is continuing", i)

         print('stop')

         self.windows_bar.progressbar.stop()
         self.windows_bar.destroy()
         self.button.config(state=tk.NORMAL)


 class WinProgressBar(tk.Toplevel):
     def __init__(self, parent):
         super().__init__(parent)
         self.title("Progress")
         self.geometry("300x200")
         self.progressbar = ttk.Progressbar(self, mode="indeterminate")
         self.progressbar.place(x=30, y=60, width=200)
         self.progressbar.start(20)


 if __name__ == "__main__":
     global_variables()
     app = App()
     app.mainloop()
     print("Code after loop")
     for x in range(len(global_variables.DirSelected)):  # testing to view files TODO REMOVE this
          print(global_variables.DirSelected[x])

No errors can be shown this time the code will run

Answer 1

It works fine for me. I think you just were checking the wrong variable DirSelected which was in fact an empty string. (see my code)

Also, I moved your WinProgressBar so it is available when the thread is executing. (was getting an exception on this).

import threading
import tkinter as tk
import tkinter.ttk as ttk
import hashlib
import glob


class global_variables:
    def __init__(self):
        pass
    DirSelected = '' 
    Manifest = []

class App(tk.Tk):
    def __init__(self):
        super().__init__()
        self.title("Progress bar example")
        self.button = tk.Button(self, text="Start", command=self.start_action)
        self.button.pack(padx=10, pady=10)

    def start_action(self):
        self.button.config(state=tk.DISABLED)
        self.windows_bar = WinProgressBar(self)

        t = threading.Thread(target=self.contar)
        t.start()

    def contar(self):

        directories_scanned = [str, 'File,Md5!']  # , separator value ! delineator adds new line
        target_dir = '/home/jsantos/workspace/blog.santos.cloud/' # this wont run 
        files = glob.glob(target_dir + '/**/*.*', recursive=True)  # Line adds search criteria aka find all all to the
        # directory for GLOB
        for file in files:
            with open(file, "rb") as f:
                file_hash = hashlib.md5()
                while chunk := f.read(8192):
                    file_hash.update(chunk)
                directories_scanned.append(
                    file + ',' + str(file_hash.hexdigest() + '!'))  # Appends the file path and Md5
        global_variables.Manifest = directories_scanned

        for x in range(len(global_variables.Manifest)):  # testing to view files TODO REMOVE this
            print(global_variables.Manifest[x])
   
        for i in range(10): #to here 
            print("Is continuing", i)

        print('stop')

        self.windows_bar.progressbar.stop()
        self.windows_bar.destroy()
        self.button.config(state=tk.NORMAL)

class WinProgressBar(tk.Toplevel):
    def __init__(self, parent):
        super().__init__(parent)
        self.title("Progress")
        self.geometry("300x200")
        self.progressbar = ttk.Progressbar(self, mode="indeterminate")
        self.progressbar.place(x=30, y=60, width=200)
        self.progressbar.start(20)


if __name__ == "__main__":
    global_variables()
    app = App()
    app.mainloop()
    print("Code after loop")
    for x in range(len(global_variables.Manifest)):  # testing to view files TODO REMOVE this
        print(global_variables.Manifest[x])