我正在使用Tkinter在Toplevel()中显示图像,但当我把它放在一个函数中时它不起作用(这是我知道的初学者)
# -*- coding: utf-8 -*-
import Tkinter
from Tkinter import *
import tkMessageBox
from tkMessageBox import *
import Image, ImageTk
import PIL.Image, PIL.ImageTk
import os
import subprocess
root = Tk()
root.title("Test")
quin=Toplevel()
C = Tkinter.Canvas(quin, bg="white", height = 350, width = 350)
directory=os.path.dirname(os.path.abspath(__file__))
filename=os.path.join(directory, 'un.png')
img=PIL.Image.open(filename)
tkimg=PIL.ImageTk.PhotoImage(img)
image = C.create_image(175,175,image=tkimg)
C.grid(row=5,column=5)
def Head():
h1 = Label(root, text = "How to Secure a Computer", fg ="white", bg = "#00b8ff", width = 6,bd=2, height =2, font = "Arial", relief = RAISED)
h1.grid(row= 0, column = 0, ipadx=122, pady=3, padx=5,columnspan=3)
def Mainmenu():
menubar = Menu(root)
filemenu = Menu(menubar, tearoff=0)
filemenu.add_command(label="Exit", command=root.destroy)
menubar.add_cascade(label="Options", menu=filemenu)
helpmenu = Menu(menubar, tearoff=0)
helpmenu.add_radiobutton(label="Help")
helpmenu.add_radiobutton(label="User Manual Security Configuration Guide")
menubar.add_cascade(label="Help", menu=helpmenu)
root.config(menu=menubar)
def Mainbuttons():
B1=Button(root,text="Services",height=2, width=6,bd=2, font = "Arial", fg = "#FFFFFF", bg = "#156cff",command=Services)
B2=Button(root,text="Account Policies",height=2, width=6,bd=2, font = "Arial", fg = "#FFFFFF", bg = "#156cff")
B3=Button(root,text="Firewall Config",height=2, width=6,bd=2, font = "Arial", fg = "#FFFFFF", bg = "#156cff")
B4=Button(root,text="User Logon Time",height=2, width=6,bd=2, font = "Arial", fg = "#FFFFFF", bg = "#156cff")
B5=Button(root,text="Security Policies",height=2, width=6,bd=2, font = "Arial", fg = "#FFFFFF", bg = "#156cff")
B1.grid(row = 1, column = 0, ipadx=120,pady=2,padx=5)
B2.grid(row = 1, column = 1, ipadx=120,pady=2,padx=5)
B3.grid(row = 2, column = 1, ipadx=120,pady=2,padx=5)
B4.grid(row = 2, column = 0, ipadx=120,pady=2,padx=5)
B5.grid(row = 3, column = 0, ipadx=120,pady=2,padx=5)
def Services():
serv=Toplevel()
servcanv=Canvas(serv,height=250, width=250)
servtext=Text(serv,width=26)
servtext.insert(INSERT, "To start go to your start menu, in the search bar\ntype services.msc")
servtext.grid(row=0, column=0)
servcanv.grid(row=0, column=1)
s = Tkinter.Canvas(serv, bg="white", height = 350, width = 350)
directory=os.path.dirname(os.path.abspath(__file__))
filename=os.path.join(directory, 'un.png')
img=PIL.Image.open(filename)
tkimg=PIL.ImageTk.PhotoImage(img)
image=s.create_image(175,175,image=tkimg)
s.grid(row=5,column=5)
Mainmenu()
Mainbuttons()
Head()
root.mainloop()
正如您所看到的,用于显示图像的代码使用了两次,一次在函数内部,一次在外部。在外面它完美地工作,但是当它在里面工作时,它表示可变图像被分配但从未使用过。
答案 0 :(得分:5)
它在函数内部不起作用,因为tkimg
在函数完成后被垃圾收集。您需要将图像绑定到不会被垃圾回收的变量中。例如,对于全局变量或类中的实例变量,而不是局部变量。
使tkimg
能够在函数中写入全局tkimg
使用global tkimg
。