Question

我使用以下命令在Python中创建一个消息框

import tkinter
import ctypes

class app:

    def __init__(self):
        self._root= tkinter.Tk()
        self._root.grid()
        self.menubar = tkinter.Menu(self._root)
        self.filemenu  = tkinter.Menu(self.menubar) 
        self.filemenu.add_command(label="Salva", command=self._save)
        self.filemenu.add_command(label="prova", command=self._save)
        self.menubar.add_cascade(label="File", menu=self.filemenu) 
        self._root.config(menu=self.menubar)

    def _save(self):
        MBW=ctypes.windll.user32.MessageBoxW(0, "Salvare le modifiche?", "Salva", 3)

    def mostra(self):
        self._root.mainloop()
a=app()
a.mostra()

通过单击File, Salva打开对话框，然后在打开对话框的情况下选择File, prova来重现错误：

C:\>python test.py
Fatal Python error: PyEval_RestoreThread: NULL tstate

Current thread 0x00001f70 (most recent call first):
  File "C:\test.py", line 16 in _save
  File "C:\Python37\lib\tkinter\__init__.py", line 1705 in __call__
  File "C:\Python37\lib\tkinter\__init__.py", line 1283 in mainloop
  File "C:\test.py", line 19 in mostra
  File "C:\test.py", line 21 in <module>

如何解决该错误？

Answer 1

为防止在打开对话框时访问其他菜单命令，请将句柄传递到活动窗口MessageBoxW，这将阻止与主窗口的进一步交互，直到解决对话框为止：

def _save(self):
    hwnd = ctypes.windll.user32.GetActiveWindow()
    MBW = ctypes.windll.user32.MessageBoxW(hwnd, "Salvare le modifiche?", "Salva", 3)

或者，使用tkinter messageboxes之一在内部做同样的事情：

from tkinter import messagebox

def _save(self):
    answer = messagebox.askyesnocancel("Salvare le modifiche?", "Salva")

Python ctypes中的MessageboxW发生错误PyEval_RestoreThread

1 个答案: