Python 3 - Tcl/Tk 如何从文件对话框获取文件名并更改标签

Question

我正在尝试 select 一个文件并让标签显示其名称。

def onOpen():
    photo_label = filedialog.askopenfilename()
    pass


#photo code
photo = PhotoImage(file="smile.png")
photo_label = Button(image=photo, command=onOpen).grid()
#I am attempting to change text=photo_label to reflect the file name
text = Label(text=photo_label) # included to show background color
text.grid()

Answer 1

可以用一个StringVar，传给label的textvariable选项，这样每次改变变量的值，label的文字也是：

import tkinter as tk
from tkinter import filedialog

def onOpen():
    """ Ask the user to choose a file and change the update the value of  photo_label"""
    photo_label.set(filedialog.askopenfilename())

root = tk.Tk()
# StringVar that will contain the file name
photo_label = tk.StringVar(root)

photo = tk.PhotoImage(file="smile.png")
tk.Button(root, image=photo, command=onOpen).grid()

text = tk.Label(root, textvariable=photo_label)
text.grid()

root.mainloop()

备注：grid() returns None 所以在你的代码中，
photo_label = Button(image=photo, command=onOpen).grid()
刚刚将值 None 分配给 photo_label。

Python 3 - Tcl/Tk 如何从文件对话框获取文件名并更改标签

Python 3 - Tcl/Tk how to get filename from filedialog and change label

python

tk

tkinter