wxPython 处理 SIGTERM / SIGINT

Question

我有一个 wxPython 应用程序。我希望它响应 SIGTERM 和 SIGINT 就像单击“关闭”按钮一样。但是，当我使用signal.signal(signal.SIGTERM, exit_handler) 绑定信号时，它们仅在事件以图形方式发送到主应用程序（单击按钮、打开菜单等）后才会执行。如何避免这种情况并在捕获事件后立即执行句柄？

相关代码部分：

class MyFrame(wx.Frame):
    def __init__(self, parent, title):
        # ...
        self.Bind(wx.EVT_CLOSE, self.signal_handler)
        signal.signal(signal.SIGTERM, self.signal_handler)
        signal.signal(signal.SIGINT, self.signal_handler)

# ...

app = wx.App(redirect=False, clearSigInt=False)
frame = MyFrame(None, "Hello World")
app.MainLoop()

即使信号调用被移到任何函数之外并在任何 wx 调用之前执行，也会发生这种情况。

Answer 1

一种方法是添加一个“计时器”来伪造事件。

import wx
import signal, os

def signalUSR1_handler(sig,frame):
    print ("Signal Caught")

class ExampleFrame(wx.Frame):
    def __init__(self, parent):
        wx.Frame.__init__(self, parent)
        pid_no = str(os.getpid())
        panel = wx.Panel(self)
        self.quote1 = wx.StaticText(panel, label="Test signal with timer", pos=(20, 30))
        self.quote2 = wx.StaticText(panel, label="Send this process a USR1 signal", pos=(20, 50))
        self.quote3 = wx.StaticText(panel, label="kill -s USR1 "+pid_no, pos=(20, 70))
        self.button = wx.Button(panel, -1, "Click", pos=(20,90))
        self.button.Bind(wx.EVT_BUTTON, self.OnPress)
        self.timer = wx.Timer(self)
        self.Bind(wx.EVT_TIMER, self.OnTimer, self.timer)
        self.timer.Start(1000)
        self.Show()
    def OnPress(self, event):
        print ("Button Pressed")
    def OnTimer(self, event):
        return
app = wx.App()
ExampleFrame(None)
signal.signal(signal.SIGUSR1,signalUSR1_handler)
app.MainLoop()