Re: deleting variable for playing audio results in crash

From:
"David Ching" <dc@remove-this.dcsoft.com>
Newsgroups:
microsoft.public.vc.mfc
Date:
Wed, 23 Apr 2008 04:19:00 GMT
Message-ID:
<UMyPj.98$506.63@newssvr27.news.prodigy.net>
"Rehmet" <rgnurrahmat@gmail.com> wrote in message
news:b17d37a0-0bee-42cc-80a8-1907d7fb7164@34g2000hsf.googlegroups.com...

Thank you David and Joe,

I made a mistake on deleting,

Deleting:
if(play1->Playing!=-17891602) //the number means whether the variable
still exist or not
{
play1->ExitInstance();
delete play1;
}

it's actually, after I put breakpoints heavily, on

if(record->recording==TRUE)
{
record->PostThreadMessage(WM_RECORDSOUND_STOPRECORDING,0,0);
record->PostThreadMessage(WM_RECORDSOUND_ENDTHREAD,0,0);

}
if(record->recording!= -17891602)
{
delete record;
}

it will give me crash on:
msacm32.drv!72d12dc5()
[Frames below may be incorrect and/or missing, no symbols loaded for
msacm32.drv]

OK, David.
I have tried with your idea, unfortunately, play1-> or record-> does
not give me option on PostQuitMessage, it only gives me
PostThreadMessage, however, I find it by using ::PostQuitMessage

Since it is record that gives me that crash, these are snippets of
stop and end thread message
void RecordSound::OnStopRecording(WPARAM wp,LPARAM lp)
{
MMRESULT mmReturn = 0;

//log.WriteString("\nIn the onstop recording");

if(!recording)
return ;

mmReturn = ::waveInStop(m_hRecord);

//To get the remaining sound data from buffer
//Reset will call OnSoundData function

if(!mmReturn)
{
recording = FALSE;
mmReturn = ::waveInReset(m_hRecord);
}

/**** Code has been changed ****/
// if(!mmReturn)
// recording = FALSE;

Sleep(500);

if(!mmReturn)
mmReturn = ::waveInClose(m_hRecord);

return ;

}

void RecordSound::OnEndThread(WPARAM wp,LPARAM lp)
{
//log.WriteString("\nIN the onendthread");

if(recording)
OnStopRecording(0,0);

::PostQuitMessage(0);
return ;
}


You do a good thing with:
    record->PostThreadMessage(WM_RECORDSOUND_ENDTHREAD,0,0);

this causes the record thread to do a PostQuitMessage() and eventually exit.

I'm not sure what the -17891602 means in:
    if(record->recording!= -17891602)
   {
       delete record;
   }

but in any case, you should not call "delete record" since the record thread
should auto-delete itself after it processes the Quit message.

-- David

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