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python - 如何启动功能，只有在用户选择文件后？

问题描述

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

我当前的代码看起来像这样

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) 是我想在文件提交后调用的函数，但是到目前为止我还没有成功。

我尝试使用 after() 函数和 lambda 通过按钮按下来调用两个函数，但是到目前为止都没有工作。

任何帮助表示赞赏。

标签： pythonpython-3.xtkinter

解决方案

您可以简单地调用populate()inside uploadAction()，但您需要将选定的文件传递给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

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