如何启动功能，只有在用户选择了文件之后

Question

我正在尝试创建一个简单的GUI，在按下上传按钮，选择文件并上传后，它将运行另一个功能。问题是，无论我尝试什么，它要么完全停止GUI，要么根本不起作用。

我当前的代码看起来像这个

import tkinter as tk
from tkinter import *
from tkinter import messagebox
from tkinter import filedialog
def populate(frame):
# for image in filename():
#         image = Image.open(image)
#         photo = ImageTk.PhotoImage(image.resize((200, 200), Image.ANTIALIAS))
#         label = Label(top_left, image=photo)
#         label.image = photo
#         label.pack()
for row in range(100):
tk.Label(frame, text="%s" % row, width=3, borderwidth="1", 
relief="solid").grid(row=row, column=0)
t="this is the second column for row %s" %row
tk.Label(frame, text=t).grid(row=row, column=1)
def onFrameConfigure(canvas):
'''Reset the scroll region to encompass the inner frame'''
canvas.configure(scrollregion=canvas.bbox("all"))

def uploadAction(event=None):
filename = filedialog.askopenfilenames(parent=root, title='Choose files')
print('Selected:', filename)
return filename

def uploadButton():
UploadButton = Button(root, text='Select image(s)', command=uploadAction)
UploadButton.place(relx = 0.40, rely = 0.9)# 100,y = 260)
#UploadButton.pack()
root = tk.Tk()
root.title('Deasease detector')
root.minsize(600,600)
canvas = tk.Canvas(root, borderwidth=5, background="green")
frame = tk.Frame(canvas, background="blue")
vsb = tk.Scrollbar(root, orient="vertical", command=canvas.yview)
canvas.configure(yscrollcommand=vsb.set)
vsb.pack(side="right", fill="y")
canvas.pack(side="left", fill="both", expand=True)
canvas.create_window((4,4), window=frame, anchor="nw")
frame.bind("<Configure>", lambda event, canvas=canvas: onFrameConfigure(canvas))
uploadButton()
populate(frame)# ????????????????????????????????????????

root.mainloop()

populate(frame(是我想在提交文件后调用的函数，但到目前为止我还没有成功。

我试着用after((函数和lambda通过按钮调用两个函数，但到目前为止都不起作用。

感谢您的帮助。

Answer 1

您可以简单地在uploadAction()内部调用populate()，但需要将所选文件传递给populate():

from PIL import Image, ImageTk
...
def populate(frame, filenames):
# do whatever you want on filenames
# below will show all the selected images in the frame
for row, fname in enumerate(filenames):
image = Image.open(fname)
photo = ImageTk.PhotoImage(image.resize((200, 200), Image.ANTIALIAS))
label = tk.Label(frame, image=photo)
label.grid(row=row, column=0)
label.photo = photo
def uploadAction(event=None):
filenames = filedialog.askopenfilenames(parent=root, title='Choose files')
print('Selected:', filenames)
if filenames:
populate(frame, filenames) # call populate() on filenames
return filenames