Re: Weird memory leak under XP (SP2)

From:

"David Ching" <dc@remove-this.dcsoft.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Sat, 19 Jan 2008 12:07:09 -0800

Message-ID:

<qLskj.40268$Pv2.35625@newssvr23.news.prodigy.net>

"Jim" <adirondackmtn@yahoo.com> wrote in message
news:105feefa-1205-47e5-b993-1907f6d7cbff@e25g2000prg.googlegroups.com...

Hi,

I finally upgraded my PC from win98 & now running XP SP2. I rebuilt
one of my many MFC apps (VC 6.0) and noticed memory leaks. I added a
return FALSE in InitInstance() of the main app, so there's no dialog
box and the leaks are still there:

Loaded 'C:\WINDOWS\WinSxS\x86_Microsoft.Windows.Common-
Controls_6595b64144ccf1df_6.0.2600.2982_x-ww_ac3f9c03\comctl32.dll',
no matching symbolic information found.
Loaded 'C:\WINDOWS\system32\comctl32.dll', no matching symbolic
information found.
Detected memory leaks!
Dumping objects ->
{45} normal block at 0x00322638, 33 bytes long.
Data: < C > 00 43 00 CD CD CD CD CD CD CD CD CD CD CD CD
CD
{44} normal block at 0x003225D0, 40 bytes long.
Data: < |L > 14 7C 4C 10 16 00 00 00 00 00 00 00 00 00 00
00
Object dump complete.
The thread 0xACC has exited with code 0 (0x0).

I noticed the odd double load of comctl32.dll. I created a dialog
based MFC app from scratch and that odd load isn't there. No leaks
either.

Anyone know what gives and what I can do about it? Please don't tell
me to re-create my app. I have a bunch of 'em. :(

If the object dump is the same for multiple running of your app, notice the
bottom block occurs at {44}, which is the 44th time memory was allocated.
Read up on CrtSetBreakAlloc(). Either add a call to CrtSetBreakAlloc(44) in
your InitInstance() or set _crtbreakalloc global variable to 44 and set a
conditional breakpoint when it hits 0. Then you can see the line of code
that allocated the 44th thing.

-- David