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Article #2299

Re: My app closes, but cancels Windows shutdown?

#2299
From: A Nonymous
Date: Fri, 09 Mar 2007 22:50
60 lines
3485 bytes
"Remy Lebeau \(TeamB\)" <no.spam@no.spam.com> wrote in news:45f1d8a5$1
@newsgroups.borland.com:

> 
> "A Nonymous" <anonymous@hotmail.com> wrote in message
> news:Xns98EE9F12960D1anonymoushotmailcom@207.105.83.66...
> 
>> I modified my fake shutdown utility to list all window handles
> before
>> sending the terminate to the main form.  Wow!  I had 635 handles
>> before the shutdown, and after the shutdown there were 439.  I
>> was amazed to see that my app had 200 window handles.
> 
> It is very unlikely that it has 200 top-level windows, unless you have
> a lot of components creating hidden windows.  I would expect the
> program to have 200 windows if you are taking all of the child windows
> into account, though.
> 

This surprised mee too.  It may be due to some of theois 3rd party 
components.  I only have about 40 total forms, and most of those are 
dynamically created as needed. (pop up edit dialogs,and such)


>> Now I just have to figure out this example code for tracing the
>> messages. In concept I understand it, but I need to figure out how
>> to implement it in my app.
> 
> Just copy/paste it as-is into the main source file of the project,
> where WinMain() is implemented.
> 
> 
> Gambit
> 
> 
> 

Well you are right it was easy.  I was concerned that I might have 
trouble writing to a log file from there or something, but it went in 
without a hitch.

Now the bad news... It doesn't seem to work.  I get nothing.  In fact I 
tried setting a breakpoint on the if( nCode == HC_ACTION ) line and then 
using my fake shutdown utility to send a WM_QUERYENDSESSION.  The app 
closed, but the break point was never reached.

A dumb question that just occurred to me.  Should the hHook = 
SetWindowsHookEx line be the first line in the WINAPI WinMani function 
or shold it come after the Application->Initialize()?

Right now it is the first line, and the UnhookWindowsHookEx is on the 
second to last line just above the return 0;

Is there something else I need to to to make this work?

OK, I just checked one other thing.  I put a break point on the 
SetWindowsHookEx and after I stepped over it hHook was still NULL.  Is 
this normal?

Anyhow I really appreciate the help.
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Subject: Re: My app closes, but cancels Windows shutdown?
From: A Nonymous <anonymous@hotmail.com>
References: <Xns98ED90968E734anonymoushotmailcom@207.105.83.66> <45f07307@newsgroups.borland.com> <Xns98ED988E421A8anonymoushotmailcom@207.105.83.66> <45f08f8f$1@newsgroups.borland.com> <Xns98EDAC20DAA4Eanonymoushotmailcom@207.105.83.66> <45f095bf$1@newsgroups.borland.com> <45f0a594@newsgroups.borland.com> <45f0a77f$1@newsgroups.borland.com> <45f0d6c1@newsgroups.borland.com> <Xns98EE722D896C6anonymoushotmailcom@207.105.83.66> <45f1a96b$1@newsgroups.borland.com> <Xns98EE9F12960D1anonymoushotmailcom@207.105.83.66> <45f1d8a5$1@newsgroups.borland.com>
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