C / C++ / MFC

HeapWalk and PROCESS_HEAP_ENTRY_MOVEABLE

6-Jul-07 2:39

Knowing how to handle messages (both sending and receiving) is paramount in understanding the very basics of Windows development.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Blake Miller5-Jul-07 7:52

Blake Miller

5-Jul-07 7:52

Has anyone ever seen the PROCESS_HEAP_ENTRY_MOVEABLE bit set in any of the heap entries encountered while walking a heap?

I have allocated some memory using GlobalAlloc(GMEM_MOVEABLE, nBlockSize);
where nBlockSize = 65 * 1024.

When I call HeapWalk and iteratively obtain the PROCESS_HEAP_ENTRY data, I never see the PROCESS_HEAP_ENTRY_MOVEABLE bit set in any of the heap entries.

I used GetProcessHeaps and separately walked each of the 3 heaps my test program has in it.

The entire reason this is an issue is that a process is only allowed 65535 GMEM_MOVEABLE allocations at one time (according to a couple Microsoft documents), and our product is reaching this limit. I want to periodically check, for QA purposes, how many handles have already been used.

how to develop themes

pritthi5-Jul-07 7:22

pritthi

5-Jul-07 7:22

how can I create or develop a theme like the popular themes "crystal xp" or like something else by using Visual C++ / MFC ?

WAITING eagerly for anykind of answers.Thanks in advance.

David Crow5-Jul-07 7:32

5-Jul-07 7:32

Does this help?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

led mike5-Jul-07 8:14

led mike

5-Jul-07 8:14

Would you please stop searching the internet, there is nothing of value there Big Grin | :-D

Perspx5-Jul-07 18:42

Perspx

5-Jul-07 18:42

If you want to do it programmatically, if you have heard of the application WindowBlinds (which skins windows), I believe that it works by injecting a DLL/multiple DLLs into every running application (including explorer.exe to skin the taskbar and start menu), which then takes over the window's window procedure, and custom draws all of the controls.. I'm not sure how much time you want to spend over your appication or how complicated you want it to be.. but I think this is probably the right way to go if you wish to do it programatically..

Hope this helps!
--PerspX

"Nowadays, security guys break the Mac every single day. Every single day, they come out with a total exploit, your machine can be taken over totally. I dare anybody to do that once a month on the Windows machine." - Bill Gates

Hamid_RT6-Jul-07 1:06

Hamid_RT

6-Jul-07 1:06

Does this[^] article helpful?

WhiteSky

Windbg

tom groezer5-Jul-07 5:20

5-Jul-07 5:20

Can somebody let me know some good links to windbg tutorials.

David Crow5-Jul-07 7:05

5-Jul-07 7:05

Have you seen this?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

tom groezer5-Jul-07 7:28

5-Jul-07 7:28

I know that link and is used for downloading the debugging framework.

David Crow5-Jul-07 7:35

5-Jul-07 7:35

So have you seen this, or this?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Paresh Chitte5-Jul-07 20:08

Paresh Chitte

5-Jul-07 20:08

Hi David,

Would you mind if you use link[^] instead of link tag while posting ?

Regards,

Paresh.

Virtual destructors

tom groezer5-Jul-07 5:19

5-Jul-07 5:19

One place where virtual destrcutors is used is in virtual functions. Is there any other place where the same is used.

Re: Virtual destructors

David Crow5-Jul-07 7:02

5-Jul-07 7:02

A virtual destructor is not something that you "use" per se. They allow base/derived objects to be destroyed correctly. What exactly are you wanting to know, or trying to accomplish?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: Virtual destructors

tom groezer5-Jul-07 7:26

5-Jul-07 7:26

Is the use of virtual destructors only limited to places where we use virtual functions?

Re: Virtual destructors

David Crow5-Jul-07 7:38

5-Jul-07 7:38

No.

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Crash

tom groezer5-Jul-07 5:16

5-Jul-07 5:16

If the program crashed just entering main in a win32 console application what could be the reason of the crash?

David Crow5-Jul-07 7:04

5-Jul-07 7:04

Were any statements in main() executed?

"A good athlete is the result of a good and worthy opponent." - David Crow

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

tom groezer5-Jul-07 7:24

5-Jul-07 7:24

NO.

#realJSOP5-Jul-07 7:11

#realJSOP

5-Jul-07 7:11

tom groezer wrote:
what could be the reason of the crash?

Bad code.

"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
-----
"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001

Matthew Faithfull5-Jul-07 7:50

Matthew Faithfull

5-Jul-07 7:50

I would guess that you did something during static intialisation that screwed up the stack.

Nothing is exactly what it seems but everything with seems can be unpicked.

CPallini5-Jul-07 9:27

CPallini

5-Jul-07 9:27

UFO

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.