Question

我有一个看起来像这样的Python程序

from tkinter import *
import threading, time
def cancel ():
    print ("Stop!")
def thread ():
    threading.Thread (target = new).start ()
def new ():
    b.pack_forget ()
    c = Canvas (root, width = 200, height = 25, bg = "white")
    c.pack ()
    Button (root, text = "OK", command = root.destroy).pack ()
    try:
        for x in range (200):
            time.sleep (0.02)
            c.create_rectangle ((x, 2, x + 1, 26), outline = "green", fill = "green")
        root.destroy ()
    except: pass
root = Tk ()
root.title ("Threading")
b = Button (root, text = "Begin.", command = thread)
b.pack ()
root.mainloop ()

但是，每次调用pack_forget（）时它都会崩溃。我知道我可以这样做：

from tkinter import *
import threading, time
def cancel ():
    print ("Stop!")
def thread ():
    b.pack_forget ()
    threading.Thread (target = new).start ()
def new ():
    c = Canvas (root, width = 200, height = 25, bg = "white")
    c.pack ()
    Button (root, text = "OK", command = root.destroy).pack ()
    try:
        for x in range (200):
            time.sleep (0.02)
            c.create_rectangle ((x, 2, x + 1, 26), outline = "green", fill = "green")
        root.destroy ()
    except: pass
root = Tk ()
root.title ("Threading")
b = Button (root, text = "Begin.", command = thread)
b.pack ()
root.mainloop ()

但是，对于其他程序，是否可以在线程中调用pack_forget。感谢。

Answer 1

您不能从创建GUI的线程以外的线程调用tkinter函数。您需要设置一个线程安全的队列，并从工作线程中放置一些东西。主线程可以轮询此队列并响应数据。

例如，您可以在队列中放置一些像"pack_forget"这样简单的东西，当主程序从队列中拉出字符串"pack_forget"时，它就会知道调用该函数。

在线程中调用pack_forget（）

1 个答案: