gamedevlists-windows

RE: [GD-Windows] Beep error on exit

[Brian S. <bs...@mi...>]

> When my app exits under the debugger, I hear the "Error beep" in the
> background, but I don't see any complaints in the debugger output, nor
> do any asserts fire.  Putting a breakpoint at the last line of main()
I
> don't get any beep errors either.

Who/what is firing the beep off?  Just wondering...

> Is there a simple, slick way to put in a handler to get called when
any
> type of error crops up, that way stuff that is "broken but magically
> fixed because the app's exiting anyway" can get fixed correctly on my
> part.

Check out SetUnhandledExceptionFilter().

--brian

RE: [GD-Windows] Beep error on exit

[Brian H. <bri...@py...>]

At 09:40 PM 2/21/2002 -0800, Brian Sharon wrote:
>Who/what is firing the beep off?  Just wondering...

No clue.  When I run in Debug Mode under MSVC and quit the app, I get the 
beep.  If I run in Release Mode, no beep.  I've seen this before, usually 
something "Bad" is happening somewhere and the message beep is telling me 
about it, but there's no way to trap it.

>Check out SetUnhandledExceptionFilter().

Thanks, I'll check that out!

Brian

RE: [GD-Windows] Beep error on exit

[Brian S. <bs...@mi...>]

> From: Brian Hook [mailto:bri...@py...]
> Sent: Thursday, February 21, 2002 9:43 PM
> To: gam...@li...
> Subject: RE: [GD-Windows] Beep error on exit
>=20
> At 09:40 PM 2/21/2002 -0800, Brian Sharon wrote:
> >Who/what is firing the beep off?  Just wondering...
>=20
> No clue.  When I run in Debug Mode under MSVC and quit the app, I get
the
> beep.  If I run in Release Mode, no beep.  I've seen this before,
usually
> something "Bad" is happening somewhere and the message beep is telling
me
> about it, but there's no way to trap it.

Maybe you have static object destructors doing something bogus?  Don't
forget you can keep stepping for quite awhile past the end of main(),
there's a bunch of code still left to execute at that point.

In this case I'm not sure SetUnhandledExceptionFilter is going to help
you, it doesn't sound like you have an actual exception/access violation
going on - or you'd already be dropping into the debugger.  Sorry :(.
You could try setting a breakpoint on MessageBeep(), assuming that's
what triggers the sound.

Good luck,

--b.

RE: [GD-Windows] Beep error on exit

[Brian H. <bri...@py...>]

I figured out what was causing the beep, sort of.  It was, in fact,
because of static object destructors.  Specifically, it was some debug
code that basically did this:

Sprite::~Sprite()
{
   VERIFY( m_pData == 0 ); //make sure we've freed up our memory
}

The VERIFY was failing (because the memory wasn't freed up), but instead
of throwing up a messagebox like it should have, it just beeped and
died.  I had to walk the exit handler chain and step through the
disassembly to find this -- for some reason setting breakpoints in the
destructors wasn't working.

Brian

RE: [GD-Windows] Beep error on exit

[Jon W. <hp...@mi...>]

I do something like this in my assert-like code, just to avoid 
the problems with windows contexts and threads and message 
handlers.

#define ENSURE(x)  ((x) || *(volatile char *)0)

Cheers,

			/ h+

> -----Original Message-----
> From: gam...@li...
> [mailto:gam...@li...]On Behalf Of
> Brian Hook
> Sent: Monday, March 04, 2002 1:13 PM
> To: gam...@li...
> Subject: RE: [GD-Windows] Beep error on exit
> 
> 
> I figured out what was causing the beep, sort of.  It was, in fact,
> because of static object destructors.  Specifically, it was some debug
> code that basically did this:
> 
> Sprite::~Sprite()
> {
>    VERIFY( m_pData == 0 ); //make sure we've freed up our memory
> }
> 
> The VERIFY was failing (because the memory wasn't freed up), but instead
> of throwing up a messagebox like it should have, it just beeped and
> died.  I had to walk the exit handler chain and step through the
> disassembly to find this -- for some reason setting breakpoints in the
> destructors wasn't working.
> 
> Brian
> 
> 
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