如何解决为什么我收到EOFError
我正在使用 tkinter和urllib 制作此程序,该程序应该像一个下载管理器。在我几乎完成该程序后,我意识到我没有为下载定义取消按钮。在深入研究之后,我发现了关于 multiprocessing 的信息(在我刚使用线程之前),显然,与并行运行线程的线程相比,它是比线程更好的模块,并且它还具有终止功能。但是,无论我做什么,我似乎都无法理解此模块。它比线程复杂得多,而且我总是会遇到荒谬的错误。在我的程序中,我不断收到此错误:
Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Users\Family\AppData\Local\Programs\Python\python38-32\lib\tkinter\__init__.py",line 1883,in __call__
return self.func(*args)
File "C:/Users/Family/PycharmProjects/8-bit Downloader/test.py",line 258,in start_download
Process(target=download_files,File "C:\Users\Family\AppData\Local\Programs\Python\python38-32\lib\multiprocessing\process.py",line 121,in start
self._popen = self._Popen(self)
File "C:\Users\Family\AppData\Local\Programs\Python\python38-32\lib\multiprocessing\context.py",line 224,in _Popen
return _default_context.get_context().Process._Popen(process_obj)
File "C:\Users\Family\AppData\Local\Programs\Python\python38-32\lib\multiprocessing\context.py",line 327,in _Popen
return Popen(process_obj)
File "C:\Users\Family\AppData\Local\Programs\Python\python38-32\lib\multiprocessing\popen_spawn_win32.py",line 93,in __init__
reduction.dump(process_obj,to_child)
File "C:\Users\Family\AppData\Local\Programs\Python\python38-32\lib\multiprocessing\reduction.py",line 60,in dump
ForkingPickler(file,protocol).dump(obj)
TypeError: cannot pickle '_tkinter.tkapp' object
Traceback (most recent call last):
File "<string>",line 1,in <module>
File "C:\Users\Family\AppData\Local\Programs\Python\python38-32\lib\multiprocessing\spawn.py",line 116,in spawn_main
exitcode = _main(fd,parent_sentinel)
File "C:\Users\Family\AppData\Local\Programs\Python\python38-32\lib\multiprocessing\spawn.py",line 126,in _main
self = reduction.pickle.load(from_parent)
EOFError: Ran out of input
我完全不知道是什么导致了此错误,以及如何解决该错误。 start_download()函数似乎有问题。我的代码(我知道它有一些缺陷,我可以使其更整洁,我只是想在完成基础知识之后再做,如果您认为某些部分不相关,请通知我。)
import os
import sqlite3
import time
import urllib.request
from multiprocessing import Process
from pathlib import Path
from tkinter import *
from tkinter import filedialog
from tkinter import font
from tkinter import messageBox
from tkinter import ttk
import numpy as np
import requests
import win10toast
from PIL import Image,ImageTk
files_downloading,times_clicked,dir_files = 0,{}
info_window,customize = None,None
# The problem I believe is with the two functions below and the start function some of the code is related to the downloads tab
# which is irrelevant and some other were just functions that were unrelated so if you see a button without a function that
# exists or it is 'None' it is just deleted for the purpose of this question and also ignore the image variables!
def get_info(path,new_fullname,url_entry):
global times_clicked
lbl_await.pack_forget()
prg_br.pack_forget()
file_size = int(requests.head(str(url_entry.get()),headers={'accept-encoding': ''}).headers['Content-Length']) / 1000000
print(file_size)
file_dir = Path(str(path).replace(" \ ".strip(),"/") + "/" + new_fullname)
size_eachsec = np.array([0.0,])
my_scrollbar.pack(side=RIGHT,fill=Y)
lbl_fr = ttk.LabelFrame(second_frame,text=new_fullname,padding=5)
if len(new_fullname) > 20:
lbl_fr.config(text=new_fullname[:21] + "...")
download_prg = ttk.Progressbar(lbl_fr,orient=HORIZONTAL,length=365,mode='determinate',cursor="wait")
lbl_speed = Label(lbl_fr,text=None)
lbl_crnt_size = Label(lbl_fr,text=None)
lbl_file_size = Label(lbl_fr,text=f"File size: {round(file_size,3)} MB")
lbl_percent = Label(lbl_fr,text="0 %")
lbl_cancel_btn = ttk.Button(lbl_fr,image=cancel_btn_icon)
lbl_see_more = Label(second_frame,text="See more",fg="grey",font=("Arial",10))
download_prg.grid(row=0,column=0,columnspan=2)
lbl_speed.grid(row=0,column=2,padx=5)
lbl_crnt_size.grid(row=1,column=1)
lbl_file_size.grid(row=1,column=0)
lbl_percent.grid(row=1,column=2)
lbl_cancel_btn.grid(row=0,column=3,rowspan=2)
lbl_fr.grid(row=times_clicked,padx=5,pady=5)
lbl_see_more.grid(row=times_clicked,column=1,padx=3)
times_clicked += 1
start_time = time.time()
while True:
if file_dir.exists():
time.sleep(0.5)
crnt_size = file_dir.stat().st_size / 1000000
size_eachsec = np.append(size_eachsec,crnt_size)
percent = (crnt_size / file_size) * 100
crnt_speed = size_eachsec[1] - size_eachsec[0]
size_eachsec = np.delete(size_eachsec,0)
lbl_speed.config(text=f"{round(crnt_speed,2)} MB/s")
lbl_crnt_size.config(text=f"Downloaded: {round(crnt_size,3)} MB")
lbl_percent.config(text=f"{round(percent,2)} %")
download_prg["value"] = percent
# print( f"Current Size: {crnt_size},Current speed: {crnt_speed},File size: {file_size},# Percentage: {percent}% " f",Progress bar: {download_prg['value']}%")
if crnt_size == file_size:
break
end_time = time.time()
time_elapsed = end_time - start_time
print(f"Start time: {start_time},End time: {end_time},Time took: {time_elapsed}")
download_prg.config(cursor="arrow")
lbl_speed.config(text="Completed!")
def show_info(event):
global info_window
if info_window is not None and info_window.winfo_exists():
info_window.focus_set()
lbl_see_more.config(fg="purple")
else:
lbl_see_more.config(fg="purple")
info_window = Toplevel()
info_window.resizable(0,0)
lbl_time_took = Label(info_window,text=f"Time elapsed: {round(time_elapsed,2)}")
lbl_avg_speed = Label(info_window,text=f"Average speed: {round(file_size / time_elapsed,3)} MB/s")
lbl_time_took.pack(pady=20)
lbl_avg_speed.pack(pady=20)
lbl_see_more.bind("<Button-1>",show_info)
new_font = font.Font(lbl_see_more,lbl_see_more.cget("font"))
new_font.configure(size=10,underline=True)
lbl_see_more.config(font=new_font,fg="blue",cursor="hand2")
print("Download successful! ")
def download_files(status_bar,url_entry,output_entry,name_entry,format_entry,num,chum,var):
global files_downloading
files_downloading += 1
status_bar.config(text=f"Downloading {files_downloading} file(s)...")
url = str(url_entry.get())
if num.get() == 1:
name = url.split("/")[-1].split(".")[0]
else:
name = str(name_entry.get())
formatname = str(format_entry.get())
if var.get() == 1:
operator = str(url_entry.get())
formatname = '.' + operator[-3] + operator[-2] + operator[-1]
else:
pass
static_fullname = str(name) + formatname
new_fullname = static_fullname
path = (str(output_entry.get()) + "/").replace(" \ ".strip(),"/")
if chum.get() == 1:
conn = sqlite3.connect("DEF_PATH.db")
c = conn.cursor()
c.execute("SELECT * FROM DIRECTORY_LIST WHERE SELECTED_DEF = 1")
crnt_default_path = c.fetchall()
# print(crnt_default_path)
path = str(crnt_default_path[0][0] + "/").replace(" \ ".strip(),"/")
conn.commit()
conn.close()
else:
pass
if path + static_fullname not in dir_files.keys():
dir_files[path + static_fullname] = 0
all_files_dir = os.listdir(path)
# if fullname in all_files_dir:
while new_fullname in all_files_dir:
dir_files[path + static_fullname] += 1
if num.get() == 1:
name = url.split("/")[-1].split(".")[0] + f" ({dir_files.get(path + static_fullname)})"
else:
name = str(name_entry.get()) + f" ({dir_files.get(path + static_fullname)})"
new_fullname = name + formatname
else:
pass
print(dir_files)
Process(target=get_info,args=(path,url_entry)).start()
urllib.request.urlretrieve(url,path + new_fullname)
if len(new_fullname) > 20:
toast.show_toast(title="8-bit Downloader",msg=f"{new_fullname[:21] + '...'} was successfully downloaded. to '{path}'",duration=6,threaded=True)
else:
toast.show_toast(title="8-bit Downloader",msg=f"{new_fullname} was successfully downloaded. to '{path}'",threaded=True)
files_downloading -= 1
status_bar.config(text=f"Downloading {files_downloading} file(s)...")
if files_downloading == 0:
status_bar.config(text="Download(s) successful!")
if __name__ == '__main__':
root = Tk()
tabs = ttk.Notebook()
# the top menu
num = Intvar()
chum = Intvar()
var = Intvar()
toast = win10toast.ToastNotifier()
def start_download():
Process(target=download_files,args=(status_bar,var),daemon=True).start()
# the status bar
status_bar = Label(main_window,text="Awaiting download...",bd=1,relief=SUNKEN,anchor=W)
status_bar.pack(side=BottOM,fill=X)
# the download frame
body_frame = Frame(main_window,bg="light blue")
download_button = ttk.Button(body_frame,text="Download! ",command=start_download,padding=40,style='my.TButton')
download_button_tip = CreatetoolTip(download_button,"Initiates the downloading process. ")
download_button.pack(side=LEFT,pady=5,padx=5)
body_frame.pack(side=LEFT,fill=Y)
def clear_entry(entryname,variable=None):
if variable is not None:
variable.set(0)
entryname.config(state=norMAL)
entryname.delete(0,END)
if entryname is format_entry:
entryname.insert(0,'.')
# the main interaction menu
inter_frame = Frame(main_window)
trash_icon = ImageTk.PhotoImage(Image.open("icons/Asset 6.png"))
settings_icon = ImageTk.PhotoImage(Image.open("icons/Settings-icon.png"))
add_icon = ImageTk.PhotoImage(Image.open("icons/Plus-icon-8.png"))
minus_icon = ImageTk.PhotoImage(Image.open("icons/Minus-icon-8.png"))
change_path_icon = ImageTk.PhotoImage(Image.open("icons/Change-icon-8.png"))
url_entry = ttk.Entry(inter_frame,width=30)
label = ttk.Label(inter_frame,text="Enter the image URL: ")
clr_url = ttk.Button(inter_frame,image=trash_icon,command=lambda: clear_entry(url_entry))
file_format = ttk.Label(inter_frame,text="Choose your file format: ")
format_entry = ttk.Entry(inter_frame,width=30)
clr_format = ttk.Button(inter_frame,command=lambda: clear_entry(format_entry,var))
file_name = ttk.Label(inter_frame,text="File's name: ")
name_entry = ttk.Entry(inter_frame,width=30)
clr_name = ttk.Button(inter_frame,command=lambda: clear_entry(name_entry,num))
check_name_manual = ttk.Radiobutton(inter_frame,text="Enter name manually",variable=num,value=0,command=lambda: name_entry.config(state=norMAL))
check_name_auto = ttk.Radiobutton(inter_frame,text="Download with default name",value=1,command=lambda: name_entry.config(state=disABLED))
check_format_manual = ttk.Radiobutton(inter_frame,text="Enter format manually",variable=var,command=lambda: format_entry.config(state=norMAL))
check_format_auto = ttk.Radiobutton(inter_frame,text="Download with default format",command=lambda: format_entry.config(state=disABLED))
output_path = ttk.Label(inter_frame,text="Choose output path: ")
output_entry = ttk.Entry(inter_frame,width=30)
def set_path():
directory = filedialog.askdirectory(initialdir="/Downloads",title="Choose path")
if directory:
output_entry.delete(0,END)
output_entry.insert(0,directory)
select_path_btn = ttk.Button(inter_frame,width=3,text="...",command=set_path)
select_path_btn_tip = CreatetoolTip(select_path_btn,"Pops up a filedialog to change directory. ")
default_path_btn = ttk.Button(inter_frame,image=settings_icon,command=None)
check_default_manual = ttk.Radiobutton(inter_frame,text="Enter path manually",variable=chum,command=lambda: output_entry.config(state=norMAL))
check_default_auto = ttk.Radiobutton(inter_frame,text="Download to default path",command=lambda: output_entry.config(state=disABLED))
file_name.grid(row=0,pady=(15,10))
name_entry.grid(row=0,10))
clr_name.grid(row=0,pady=(5,0))
check_name_manual.grid(row=1,padx=(10,0))
check_name_auto.grid(row=1,0))
label.grid(row=2,pady=10,0))
url_entry.grid(row=2,0))
clr_url.grid(row=2,column=2)
file_format.grid(row=3,0))
format_entry.grid(row=3,0))
format_entry.insert(0,'.')
clr_format.grid(row=3,column=2)
check_format_manual.grid(row=4,0))
check_format_auto.grid(row=4,0))
output_path.grid(row=5,0))
output_entry.grid(row=5,5))
select_path_btn.grid(row=5,column=2)
check_default_manual.grid(row=6,pady=(0,10),0))
check_default_auto.grid(row=6,0))
default_path_btn.grid(row=6,5))
inter_frame.pack(expand=1)
main_window.pack(fill="both",expand=1)
# The Downloads tab (this part is irrelevant so I wouldn't bother checking this part out just put it there in case)
lbl_await = ttk.Label(download_fr,text="Awaiting Download...",font=("Helvetica",24))
prg_br = ttk.Progressbar(download_fr,length=250,mode='indeterminate')
my_canvas = Canvas(download_fr)
my_scrollbar = ttk.Scrollbar(download_fr,orient=VERTICAL,command=my_canvas.yview)
my_canvas.configure(yscrollcommand=my_scrollbar.set)
lbl_await.pack(pady=(85,8))
prg_br.pack()
prg_br.start(6)
my_canvas.pack(side=LEFT,fill=BOTH,expand=1)
download_fr.pack(fill="both",expand=1)
second_frame = Frame(my_canvas)
# Add that new frame to a window in the canvas
my_canvas.create_window(0,window=second_frame,anchor='nw')
# update canvas scrollregion whenever the size of second_frame is changed
second_frame.bind('<Configure>',lambda e: my_canvas.configure(scrollregion=my_canvas.bBox('all')))
tabs.pack(fill="both")
tabs.add(main_window,text="Main Window")
tabs.add(download_fr,text="Downloads")
root.mainloop()
# the end!
解决方法
我认为您的主要问题是:
TypeError: cannot pickle '_tkinter.tkapp' object
您似乎正在尝试在进程之间传递Tk对象。我怀疑这样是否行得通。
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