問題描述

我正在嘗試使用 PyQt5 編寫一個在系統托盤中運行的應用程序.代碼有時會引發異常，我需要能夠捕獲它們.

I'm trying to write an app that works in system tray using PyQt5. The code is sometimes raising exceptions, and I need to be able to catch them.

我希望當應用程序中發生異常時，主事件循環會退出，所以像這樣捕獲它應該可以工作:

I would expect that when an exception occurs in an app, the main event loop is exited, so catching it like that should work:

try:
    application.exec()
except:
    do_stuff()

在下面的例子中，當我按下Raise"按鈕時，我只看到回溯，但我從來沒有看到 error catched! 打印出來.

In the following example, when I press the "Raise" button, I only see the traceback, but I never see the error catched! printed.

from PyQt5 import QtWidgets, QtGui, QtCore

class ErrorApp():
    def __init__(self):
        # Init QApplication, QWidet and QMenu
        self.app = QtWidgets.QApplication([])
        self.widget = QtWidgets.QWidget()
        self.menu = QtWidgets.QMenu("menu", self.widget)

        # Add items to menu
        self.menu_action_raise = self.menu.addAction("Raise")
        self.menu_action_raise.triggered.connect(self.raise_error)

        self.menu_action_exit = self.menu.addAction("Exit")
        self.menu_action_exit.triggered.connect(self.app.exit)

        # Create the tray app
        self.tray = QtWidgets.QSystemTrayIcon(QtGui.QIcon("logo.png"), self.widget)
        self.tray.setContextMenu(self.menu)

        # Show app
        self.tray.show()

    def raise_error(self):
        assert False

e = ErrorApp()

try:
    e.app.exec()

except:
    print("error catched!")

有 2 個類似的問題，但那里的答案沒有做我需要做的事情:

There are 2 similar questions, but the answers there don't do what I need to do:

抓取 PyQt 中的任何異常:OP 想要監控 異常，偶數循環不退出防止 PyQt 靜默插槽中發生的異常:裝飾器回答根本行不通；將 sys.exit(1) 添加到 sys.excepthook 只會關閉整個程序，而不會打印 error catched!

Grab any exception in PyQt: the OP wants to monitor the exceptions, the even loop isn't exited Preventing PyQt to silence exceptions occurring in slots: the decorator answer simply doesn't work; adding sys.exit(1) to sys.excepthook just closes the whole program, without printing error catched!

推薦答案

你必須使用異常，如果你想要事件循環結束，那么你必須調用 quit()(或 exit()) 方法.

You must use the exception and, if you want the event loop to end then you must call the quit()(or exit()) method.

import sys
import traceback
from PyQt5 import QtWidgets, QtGui, QtCore


class ErrorApp:
    # ...

    def raise_error(self):
        assert False


def excepthook(exc_type, exc_value, exc_tb):
    tb = "".join(traceback.format_exception(exc_type, exc_value, exc_tb))
    print("error catched!:")
    print("error message:
", tb)
    QtWidgets.QApplication.quit()
    # or QtWidgets.QApplication.exit(0)


sys.excepthook = excepthook
e = ErrorApp()
ret = e.app.exec_()
print("event loop exited")
sys.exit(ret)

輸出:

error catched!:
error message:
 Traceback (most recent call last):
  File "main.py", line 28, in raise_error
    assert False
AssertionError

event loop exited

這篇關于捕獲 QApplication 中引發的異常的文章就介紹到這了，希望我們推薦的答案對大家有所幫助，也希望大家多多支持html5模板網！