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оаав ирыыва
Asked:2020-05-29 17:30:02 +0000 UTC2020-05-29 17:30:02 +0000 UTC

tkinter 不会在异常时调用 sys.excepthook

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上一个问题

这是一个错误的示例代码：

from tkinter import Tk, messagebox

def log_uncaught_exceptions(ex_cls, ex, tb):
    text = '{}: {}:\n'.format(ex_cls.__name__, ex)
    import traceback
    text += ''.join(traceback.format_tb(tb))
    print(text)
    if messagebox.askyesno("Неизвестная ошибка", "Сохранить лог с ошибкой?") == True:
        with open('error.txt', 'w', encoding='utf-8') as f:
            f.write(text)
    raise SystemExit


import sys
sys.excepthook = log_uncaught_exceptions

root = Tk()

def m_geometry(win):
    #x = (win.winfo_screenwidth() / 2) - (295 / 2)
    y = (win.winfo_screenheight() / 2) - (395 / 2)
    root.wm_geometry("+%d+%d" % (x, y))

root.after(2000, lambda: m_geometry(root)) #Функция m_geometry(root) сработает через 2 секунды

root.mainloop()

错误：

Exception in Tkinter callback
Traceback (most recent call last):
  File "C:\Program Files (x86)\Python36-32\lib\tkinter\__init__.py", line 1702, in __call__
    return self.func(*args)
  File "C:\Program Files (x86)\Python36-32\lib\tkinter\__init__.py", line 746, in callit
    func(*args)
  File "C:/.../Error.py", line 27, in <lambda>
    root.after(2000, lambda: m_geometry(root))
  File "C:/.../Error.py", line 25, in m_geometry
    root.wm_geometry("+%d+%d" % (x, y))
NameError: name 'x' is not defined

Process finished with exit code -1

必须有关于选择的消息：是否保存日志

python

1 个回答

  1. Best Answer

    钩子sys.excepthook不起作用，因为它tkinter处理回调中的异常，并且为了能够自己处理这些异常，您需要使用root.report_callback_exception：

    import traceback
import sys

from tkinter import Tk, messagebox


def log_uncaught_exceptions(ex_cls, ex, tb):
    text = '{}: {}:\n'.format(ex_cls.__name__, ex)
    text += ''.join(traceback.format_tb(tb))
    print(text)

    # Если Yes, сохраняем ошибку в файл
    if messagebox.askyesno("Неизвестная ошибка", "Сохранить лог с ошибкой?"):
        with open('error.txt', 'w', encoding='utf-8') as f:
            f.write(text)
    
    sys.exit()


sys.excepthook = log_uncaught_exceptions

root = Tk()
root.report_callback_exception = log_uncaught_exceptions

def m_geometry(win):
    #x = (win.winfo_screenwidth() / 2) - (295 / 2)
    y = (win.winfo_screenheight() / 2) - (395 / 2)
    root.wm_geometry("+%d+%d" % (x, y))

# Функция m_geometry(root) сработает через 2 секунды
root.after(2000, lambda: m_geometry(root))

root.mainloop()
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