如何使用多重处理启动一个单独的新Tk()窗口? [英] How to start a separate new Tk() window using multiprocessing?

问题描述

以下代码是可运行的，您只需复制/粘贴即可:

The following code is runnable, you can just copy/paste:

from tkinter import *
import multiprocessing

startingWin = Tk()
def createClientsWin():
    def startProcess():
        clientsWin = Tk()
        label = Label(clientsWin, text="Nothing to show")
        label.grid()
        clientsWin.mainloop()
    if __name__ == "__main__":
        p = multiprocessing.Process(target=startProcess)
        p.start()
button = Button(startingWin, text="create clients", command=lambda: createClientsWin())
button.grid()
startingWin.mainloop()

所以我只想使用多重处理创建一个完全独立的Tk()窗口.当我单击创建按钮时，我只得到原始窗口(而不是预期的窗口)，它给了我这个错误:

So I simply want to create a completely separated Tk() window using multiprocessing. When I click on the create button, I just get the original window (not the intended one) and it gives me this error:

AttributeError: Can't pickle local object 'createClientsWin.<locals>.startProcess'

*有人可以解释如何使用多处理程序启动一个单独的新Tk()窗口吗? *

更新:不是重复

即使我遵循可能重复的问题中提供的解决方案，也无助于解决我的问题.仅仅是因为，在我的案例中使用了Tkinter.修改后的代码:

Even if I follow the solution provided in the possible duplicate question, that doesn't help solving my question. Simply because, Tkinter is being used in my case. The modified code:

def createClientsWin():
    clientsWin = Tk()
    label = Label(clientsWin, text="Nothing to show")
    label.grid()
    clientsWin.mainloop()

def createClientsWinProcess():
    if __name__ == "__main__":
        p = multiprocessing.Process(target=createClientsWin)
        p.start()

startingWin = Tk()
button = Button(startingWin, text="create clients", command=lambda: createClientsWinProcess())
button.grid()
startingWin.mainloop()

推荐答案

全局范围的函数应用于多进程目标函数，因此startProcess()应该移至全局范围.

Function in global scope should be used for multiprocess target function, so the startProcess() should be moved into global scope.

此外，对startProcess()中的if __name__ == "__main__"进行检查也会导致if块中的代码无法执行.

Also the checking of if __name__ == "__main__" inside startProcess() will cause the code inside the if block not being executed.

最后，创建startingWin的位置应放在if __name__ == "__main__"块中，否则启动的每个进程都将创建startingWin.

Finally the creation of startingWin should be put inside if __name__ == "__main__" block, otherwise every process started will create the startingWin.

以下是解决上述问题的建议更改:

Below is the proposed changes to solve the above issues:

from tkinter import *
import multiprocessing

def startProcess():
    clientsWin = Tk()
    label = Label(clientsWin, text="Nothing to show")
    label.grid()
    clientsWin.mainloop()

def createClientsWin():
    p = multiprocessing.Process(target=startProcess)
    p.start()

if __name__ == '__main__':
    startingWin = Tk()
    button = Button(startingWin, text="create clients", command=createClientsWin)
    button.grid()
    startingWin.mainloop()

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