Question

在我的Tkinter Python应用程序中，我尝试使用sys.excepthook来处理未捕获的异常，但我的处理程序从未被调用过。堆栈跟踪仍然打印出来。

如何在Tkinter应用程序中处理未捕获的异常？

这是一个显示我尝试过的简单例子：

import Tkinter as tk
import tkMessageBox
import traceback
import sys

class MyApp(tk.Frame):
    def __init__(self, parent, *args, **kwargs):
        tk.Frame.__init__(self, parent, *args, **kwargs)
        self.parent = parent
        self.button_frame = tk.Frame(self)
        self.button_frame.pack(side='top')
        self.button_run = tk.Button(
            self.button_frame, text="Run", command=self.run
        )
        self.button_run.grid(row=0, column=1, sticky='W')

    def run(self):
        tkMessageBox.showinfo('Info', 'The process is running.')
        raise RuntimeError('Tripped.')

def main():
    root = tk.Tk()  # parent widget

    MyApp(root).pack(fill='both', expand=True)

    def handle_exception(exc_type, exc_value, exc_traceback):
        message = ''.join(traceback.format_exception(exc_type,
                                                     exc_value,
                                                     exc_traceback))
        tkMessageBox.showerror('Error', message)

    sys.excepthook = handle_exception

    root.mainloop()  # enter Tk event loop

if __name__ == '__main__':
    main()

Answer 1

在引发异常后我逐步完成了代码，发现它被report_callback_exception()捕获。更多搜索引导我发布了一篇文章，展示了如何override report_callback_exception()。这是我的新处理程序示例。别忘了__init__()中你实际注册处理程序的第二行。

import Tkinter as tk
import tkMessageBox
import traceback

class MyApp(tk.Frame):
    def __init__(self, parent, *args, **kwargs):
        tk.Frame.__init__(self, parent, *args, **kwargs)
        parent.report_callback_exception = self.report_callback_exception
        self.parent = parent
        self.button_frame = tk.Frame(self)
        self.button_frame.pack(side='top')
        self.button_run = tk.Button(
            self.button_frame, text="Run", command=self.run
        )
        self.button_run.grid(row=0, column=1, sticky='W')

    def run(self):
        tkMessageBox.showinfo('Info', 'The process is running.')
        raise RuntimeError('Tripped.')

    def report_callback_exception(self, exc_type, exc_value, exc_traceback):
        message = ''.join(traceback.format_exception(exc_type,
                                                     exc_value,
                                                     exc_traceback))
        tkMessageBox.showerror('Error', message)

def main():
    root = tk.Tk()  # parent widget

    MyApp(root).pack(fill='both', expand=True)

    root.mainloop()  # enter Tk event loop

if __name__ == '__main__':
    main()

使用Tkinter处理未捕获的异常

1 个答案: