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List: py2exe-users
Subject: Re: [Py2exe-users] Executing code at shutdown (windows)
From: "Mark Hammond" <mhammond () skippinet ! com ! au>
Date: 2008-08-03 22:49:48
Message-ID: 04c501c8f5bb$3ec35fa0$bc4a1ee0$ () com ! au
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The next thing I'd try is creating a hidden top-level window and seeing if
that gets closed - you'd probably need to create your own thread for the
window and the message loop. Some of the win32\Demos\win32gui_*.py have
hidden windows you may be able to adapt.
Cheers,
Mark
From: Mats Myrberg [mailto:mats.myrberg@gmail.com]
Sent: Monday, 4 August 2008 5:54 AM
To: Mark Hammond
Cc: py2exe-users@lists.sourceforge.net
Subject: Re: [Py2exe-users] Executing code at shutdown (windows)
I did try this and while reading the API docs it seems SetConsoleCtrlHandler
only applies to console apps. My app is a windows app (vs console app) and
so SetConsoleCtrlHandler does not seem to work for my app. And that seems
to be the case when I run my app as well.
It seems like a great solution for console apps. Are there parallel
solutions for a "faceless" windows apps? I realize I could create a service
but I am trying to stay away from that for various reasons.
Mats
On Fri, Aug 1, 2008 at 7:31 PM, Mark Hammond <mhammond@skippinet.com.au>
wrote:
You will probably find this isn't specific to py2exe and it behaves the same
when running under pythonw.exe - if that isn't true, you should probably
chase up why things are different rather than re-inventing your own. But
something like the following might help:
import win32api, win32con
def console_ctrl_handler(evt):
# NOTE that this is called on its own thread
...
# False means "run the next/default handler", True means don't call
others.
rc = False
# During a log-off etc process the console is also closed, so this works
# OK here.
if evt in (win32con.CTRL_CLOSE_EVENT, win32con.CTRL_LOGOFF_EVENT):
... do something to *asynchronously* close the app.
rc = True
return rc
...
win32api.SetConsoleCtrlHandler(console_ctrl_handler, True)
Note that the above is untested and was pulled from an app that will either
have a console or a real window, so just uses win32con.CTRL_CLOSE_EVENT (and
relies on the window being closed at logoff) so you might need to experiment
with exactly which events you need to handle (and as I implied above, try
and find out if twisted is expected to handle this situation ok already, or
already has a "Console Control Handler" that needs tweaking, etc) Also,
take care of threading issues - unlike a unix signal, this comes on a new
thread created just for the purpose of delivering the event, so you will
need to find out how to break your event loop externally.
HTH,
Mark
-----------
From: py2exe-users-bounces@lists.sourceforge.net
[mailto:py2exe-users-bounces@lists.sourceforge.net] On Behalf Of Mats
Myrberg
Sent: Friday, 1 August 2008 7:08 PM
To: py2exe-users@lists.sourceforge.net
Subject: [Py2exe-users] Executing code at shutdown (windows)
Hi,
I have a windows app that behaves strangely on shutdown. Basically, the app
is using twisted and uses twisted's reactor as the "event loop". However,
on shutdown and compiled as a windows, not console, app, the app never
exists the "event loop" but rather just gets killed. This gives my code no
opportunity to release resources it is holding on to etc. I have looked at
all the py2exe email archives and the site but nothing seems to address how
the exe gets "shutdown".
I am looking for a way for me to run some code when Windows signals a
shutdown (or logoff). BTW I realize this is a possible for a service but
want to keep my app as an app for now.
TIA,
Mats
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<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>The next thing I'd try is creating a hidden top-level window and
seeing if that gets closed - you'd probably need to create your own thread for
the window and the message loop. Some of the win32\Demos\win32gui_*.py have
hidden windows you may be able to adapt.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'> <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Cheers,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Mark<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'><o:p> </o:p></span></p>
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<p class=MsoNormal><b><span \
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span \
style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> Mats Myrberg \
[mailto:mats.myrberg@gmail.com] <br> <b>Sent:</b> Monday, 4 August 2008 5:54 AM<br>
<b>To:</b> Mark Hammond<br>
<b>Cc:</b> py2exe-users@lists.sourceforge.net<br>
<b>Subject:</b> Re: [Py2exe-users] Executing code at shutdown \
(windows)<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
<div>
<p class=MsoNormal>I did try this and while reading the API docs it
seems SetConsoleCtrlHandler only applies to console apps. My app is
a windows app (vs console app) and so SetConsoleCtrlHandler does not seem
to work for my app. And that seems to be the case when I run my app as
well.<o:p></o:p></p>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal>It seems like a great solution for console apps. Are
there parallel solutions for a "faceless" windows apps? I
realize I could create a service but I am trying to stay away from that for
various reasons.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'>Mats<o:p></o:p></p>
<div>
<p class=MsoNormal>On Fri, Aug 1, 2008 at 7:31 PM, Mark Hammond <<a
href="mailto:mhammond@skippinet.com.au">mhammond@skippinet.com.au</a>>
wrote:<o:p></o:p></p>
<p class=MsoNormal>You will probably find this isn't specific to py2exe and it
behaves the same<br>
when running under pythonw.exe - if that isn't true, you should probably<br>
chase up why things are different rather than re-inventing your own. But<br>
something like the following might help:<br>
<br>
import win32api, win32con<br>
def console_ctrl_handler(evt):<br>
# NOTE that this is called on its own thread<br>
...<br>
# False means "run the next/default handler", True means
don't call<br>
others.<br>
rc = False<br>
# During a log-off etc process the console is also closed, so this
works<br>
# OK here.<br>
if evt in (win32con.CTRL_CLOSE_EVENT, win32con.CTRL_LOGOFF_EVENT):<br>
... do something to *asynchronously* close the app.<br>
rc = True<br>
return rc<br>
<br>
...<br>
win32api.SetConsoleCtrlHandler(console_ctrl_handler, True)<br>
<br>
Note that the above is untested and was pulled from an app that will either<br>
have a console or a real window, so just uses win32con.CTRL_CLOSE_EVENT (and<br>
relies on the window being closed at logoff) so you might need to experiment<br>
with exactly which events you need to handle (and as I implied above, try<br>
and find out if twisted is expected to handle this situation ok already, or<br>
already has a "Console Control Handler" that needs tweaking, etc)
Also,<br>
take care of threading issues - unlike a unix signal, this comes on a new<br>
thread created just for the purpose of delivering the event, so you will<br>
need to find out how to break your event loop externally.<br>
<br>
HTH,<br>
<br>
Mark<br>
-----------<br>
From: <a href="mailto:py2exe-users-bounces@lists.sourceforge.net">py2exe-users-bounces@lists.sourceforge.net</a><br>
[mailto:<a href="mailto:py2exe-users-bounces@lists.sourceforge.net">py2exe-users-bounces@lists.sourceforge.net</a>]
On Behalf Of Mats<br>
Myrberg<br>
Sent: Friday, 1 August 2008 7:08 PM<br>
To: <a href="mailto:py2exe-users@lists.sourceforge.net">py2exe-users@lists.sourceforge.net</a><br>
Subject: [Py2exe-users] Executing code at shutdown (windows)<o:p></o:p></p>
<div>
<div>
<p class=MsoNormal style='margin-bottom:12.0pt'><br>
Hi,<br>
<br>
I have a windows app that behaves strangely on shutdown. Basically, the
app<br>
is using twisted and uses twisted's reactor as the "event loop".
However,<br>
on shutdown and compiled as a windows, not console, app, the app never<br>
exists the "event loop" but rather just gets killed. This gives
my code no<br>
opportunity to release resources it is holding on to etc. I have
looked at<br>
all the py2exe email archives and the site but nothing seems to address how<br>
the exe gets "shutdown". <br>
<br>
I am looking for a way for me to run some code when Windows signals a<br>
shutdown (or logoff). BTW I realize this is a possible for a service but<br>
want to keep my app as an app for now.<br>
<br>
TIA,<br>
<br>
Mats<br>
<br>
<o:p></o:p></p>
</div>
</div>
</div>
<p class=MsoNormal><o:p> </o:p></p>
</div>
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