C / C++ / MFC

31-Oct-05 4:40

Hi,

As far as I remember, all the articles I have seen for detecting memory leaks were associated with adding some code to your program.

What if I am running someone else's code and I want to check for memory leaks, is that doable ?

Thanks,
Shay

David Crow31-Oct-05 5:15

David Crow

31-Oct-05 5:15

Shay Harel wrote:
What if I am running someone else's code and I want to check for memory leaks, is that doable ?

While it may be possible to detect if it has or hasn't, you'd have no way of determining where.

"Take only what you need and leave the land as you found it." - Native American Proverb

Shay Harel31-Oct-05 5:30

31-Oct-05 5:30

I'll go with the first option.
If I can prove an application is leaking memory, I can get the developer to fix it. All I need to do is to prove it does it.

toxcct31-Oct-05 5:43

toxcct

31-Oct-05 5:43

it looks like a chief behavior, who don't bother at all the guys of his team Frown | :(

even if you find some memory leaks, how will the developper find the lack ?

did you ever coded in your life dude ?! Suspicious | :suss:

TOXCCT >>> GEII power
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Shay Harel31-Oct-05 5:47

31-Oct-05 5:47

To start with, I wrote tons of code and still does.
However, I am using someone else's application and I need to prove it's causing memory leaks.

Since this application runs for days, the leaks are finally halting the system. The problem is we have multiple applications running on the background and we need to find the culprit.

Sounds better ?

toxcct31-Oct-05 5:51

toxcct

31-Oct-05 5:51

Shay Harel wrote:
Sounds better ?

few...

as the program is not running alone on its machine, there could be leaks at several places.

TOXCCT >>> GEII power
[toxcct][VisualCalc]

Shay Harel31-Oct-05 5:56

31-Oct-05 5:56

Which was my original question...
Is there any application out there that somehow monitors memory usage per application so I can see if any of the applications just consume more and more memory.

Ravi Bhavnani31-Oct-05 8:59

Ravi Bhavnani

31-Oct-05 8:59

MemWatcher[^] may help to verify memory degradation.

/ravi

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Blake Miller31-Oct-05 6:00

Blake Miller

31-Oct-05 6:00

Configure the application for 'constant' behavior. That is some well-defined repeatable behavior that should USE memory but not LEAK memory.
Set up performance monitor to watch this application's working set size and private bytes. Chart over a day or two, or until application halts.
Then see if that application has a constantly growing use of the working set size and private bytes. You can probably assume it has a memory leak.

Shay Harel31-Oct-05 6:07

31-Oct-05 6:07

I will try that

vgrigor131-Oct-05 6:41

vgrigor1

31-Oct-05 6:41

To find memory leaks using just Visual stidio,-
is unappropriate complex task.

visual studio does only small chek and nothing more,
so slightly complex errors remains hardly found.

Best and easy way to use specialized program like
BoundsChecker,
or something like this.

LighthouseJ31-Oct-05 9:26

LighthouseJ

31-Oct-05 9:26

I like to drop in MMGR. Add it to your project, then read the comments in mmgr.cpp to use it. It will record every allocation without adding the header file to your project files, but it won't record the file and line number of the allocation unless the mmgr.h is included. It can record every memory allocation or only mem leaks in a text file that's easy to read. It helped me spot places where I allocated an array of characters, eg. I used

delete item;

on an array called item instead of

delete[] item;

and things like that. There are plenty of asserts in there with comments that tell you what you did wrong to cause the assertion.

James R. Twine1-Nov-05 4:08

James R. Twine

1-Nov-05 4:08

   FWIW, I do not think that kind of error causes a memory leak directly (only indirectly). Missing the [] operator causes only the first object in the array to have its destructor called, but the memory block itself is still freed.

   For example, if you missed the brackets on an array of simple types, there should be no memory leaks. However, if the array was an array of complex objects that themselves allocate memory, then that might indirectly cause leaks because the destructors will not be called on objects 2-n in the array.

   Peace!

-=- James

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James R. Twine1-Nov-05 4:11

James R. Twine

1-Nov-05 4:11

   This may be a dumb question, but why can you not just use Task Manager, and look at the memory consumption of the process in question?

   Over time, if leaks do exist, you should be able to see an increase in total memory usage over time.

   Peace!

-=- James

Shay Harel1-Nov-05 4:17

1-Nov-05 4:17

yes, this is a "memory leak" 101 thing.
I was looking for something that will do that for me and have some reporting instead of me having to look at it all the time.

.lib Files

Andre Trollip31-Oct-05 0:05

Andre Trollip

31-Oct-05 0:05

Hi Everyone,

I am faced with a bit of a problem. I suspect it is a problem only because of my non-existant knowledge of c/c++.

I need to use a third party SDK to be able to control and/or monitor some telephony hardware from a popular vendor.

My problem is that I have to do this from a .Net environment (C#) but the SDK file are .lib files. It is said that it is dynamically compiled (what that means I have no idea).

Can anyone possibly tell me how I could use it from C# and if it's impossible, how I can wrap it in normal dll's (so I can use Dllimport) as normal.

Thanks and Regards,

Phi?

Bob Stanneveld31-Oct-05 2:41

Bob Stanneveld

31-Oct-05 2:41

Hello,

I assume that you have the C++ header files for the libraries. You can do / try the following:
<list>

Set up a new project for a DLL. Here you write new headers that export the functions from the library. You create a DLL from here.

You write a managed wrapper for the library and create a .NET assembly for that.
Hope this helps Smile | :)

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Andre Trollip31-Oct-05 2:49

Andre Trollip

31-Oct-05 2:49

Thanks for your reply.

Yes I do have the header files.

So am I right in saying that I would need some C/C++ skills for this?

I feared that as I have very limited skills in that area and the header files' code seems very complex for me.

Regards,

Phi?

-- modified at 8:52 Monday 31st October, 2005

toxcct31-Oct-05 2:59

toxcct

31-Oct-05 2:59

André Trollip wrote:
I feared that as I have very limited skills in that area and the header files' code seems very complex for me.

don't worry André, headers are - most of the time - only declarations.
what can obfuscate the understanding (especially with a dll header) can be function pointers. i suggest you so having a look at the msdn on that topic, of search the web for it (but just tell you it's not so hard and everything will be ok Big Grin | :-D

TOXCCT >>> GEII power
[toxcct][VisualCalc]