Re: Memory Leak detection - C / C++ / MFC Discussion Boards

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.

Re: Memory Leak detection

Ravi Bhavnani31-Oct-05 8:59

Ravi Bhavnani

31-Oct-05 8:59

MemWatcher[^] may help to verify memory degradation.

/ravi

My new year's resolution: 2048 x 1536
Home | Music | Articles | Freeware | Trips
ravib(at)ravib(dot)com

Re: Memory Leak detection

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.

Re: Memory Leak detection

Shay Harel31-Oct-05 6:07

Shay Harel

31-Oct-05 6:07

I will try that

Re: Memory Leak detection

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.

Re: Memory Leak detection

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.

Re: Memory Leak detection

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

If you think it costs a lot to do it right, just wait until you find out how much it costs to do it wrong!
Tip for new SUV drivers: Professional Driver on Closed Course does not mean your Dumb Ass on a Public Road!
DeleteFXPFiles & CheckFavorites (Please rate this post!)

Re: Memory Leak detection

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

Re: Memory Leak detection

Shay Harel1-Nov-05 4:17

Shay Harel

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?

Re: .lib Files

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 | :)

Behind every great black man...
... is the police. - Conspiracy brother

Blog[^]

Re: .lib Files

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

Re: .lib Files

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]

Re: .lib Files

Bob Stanneveld31-Oct-05 6:24

Bob Stanneveld

31-Oct-05 6:24

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

You don't need 'skills' as in n years experience. You do need to know a little bit about the topic. Search google or CP for writing DLL's. There are some articles here about the topic.

Maybe you should try to call the vendor if they can build the library for you. This wouldn't be a crazy request since you paid for the API anyway.

Behind every great black man...
... is the police. - Conspiracy brother

Blog[^]

Why Visual Studio 6 C++ begins slowly editing for multy-project solution?

vgrigor130-Oct-05 23:26

vgrigor1

30-Oct-05 23:26

Why Visual Studio 6 C++ begins slowly editing for multy-project solution?
VS6 sp6.

One project being edited as text in studio -
for inserting new string - works very fast,
(on my P4-3000, 1GB)

but if I edit this project in solution that includes 15 projects,
inserting one line to 200 lined file
takes 1-2 seconds,

it is so long!

why so happen?

How to correct it?

thanks

Re: Why Visual Studio 6 C++ begins slowly editing for multy-project solution?

Prakash Nadar31-Oct-05 4:28

Prakash Nadar

31-Oct-05 4:28

Is your visual studio linked to some SSC ? Source control ?

If so, you can try removing it, This can speed up loading and editiing speed.

-prakash
Learning Symbian

Re: Why Visual Studio 6 C++ begins slowly editing for multy-project solution?

vgrigor131-Oct-05 6:39

vgrigor1

31-Oct-05 6:39

No, it is not linkd to versioning systems,

but only to BoundsChecker.
But with swithed off all options.

This program - can do this slow behavior ?

Re: Why Visual Studio 6 C++ begins slowly editing for multy-project solution?

Prakash Nadar31-Oct-05 18:59

Prakash Nadar

31-Oct-05 18:59

vgrigor1 wrote:
but only to BoundsChecker.
But with swithed off all options.

This program - can do this slow behavior ?

I have not used boundschecker, so no idea. Blush | :O

-prakash
Learning Symbian

Re: Why Visual Studio 6 C++ begins slowly editing for multy-project solution?

vgrigor131-Oct-05 19:16

vgrigor1

31-Oct-05 19:16

Thanks for consideration

Re: Why Visual Studio 6 C++ begins slowly editing for multy-project solution?

Shay Harel31-Oct-05 4:37

Shay Harel

31-Oct-05 4:37

Try to remove all the breakpoints in all projects, this is a killer too from some reason.

Re: Why Visual Studio 6 C++ begins slowly editing for multy-project solution?

krmed1-Nov-05 2:40

krmed

1-Nov-05 2:40

You might try the following...

Close your project, then delete the .ncb, .aps, and .clw files. Reopen the project and try again.

The .ncb file in particular can grow quite large as you edit code, (and the .aps grows with resources). Therefore the more you add/edit without deleting these file can slow down VS considerably.

Hope that helps.

Karl - WK5M
PP-ASEL-IA (N43CS)
<kmedcalf@ev1.net>
PGP Key: 0xDB02E193
PGP Key Fingerprint: 8F06 5A2E 2735 892B 821C 871A 0411 94EA DB02 E193

Re: Why Visual Studio 6 C++ begins slowly editing for multy-project solution?

vgrigor12-Nov-05 4:17

vgrigor1

2-Nov-05 4:17

I tried deleting .ncb file,
it did not helped.

Serialize content of RichEditCtrl

AnTri30-Oct-05 22:07

AnTri

30-Oct-05 22:07

Hi,

is it possible to store the content (text+format) of a CRichEditCtrl to a variable and serialize it later?
I need this because I have an Array (CObArray) with my class derived from CObject. Each item in this array should store a content of a RichEdit....

Thanks for your help...!

Re: Serialize content of RichEditCtrl

Neelesh K J Jain31-Oct-05 1:50

Neelesh K J Jain

31-Oct-05 1:50

Yes, its possible for serializing the contents of a CRichEditCtrl.

Just get the text and its format in a CString and serialize that CString. While loading get that string and display that one.

If the replies helps you, rate them.

Re: Serialize content of RichEditCtrl

AnTri1-Nov-05 1:04

AnTri

1-Nov-05 1:04

But how can I put the content of a CString to my CRichEditCtrl?

following the part I put my text from CRichEditCtrl to a CString

<br />
static DWORD CALLBACK MyStreamOutCallback(DWORD dwCookie, LPBYTE pbBuff, LONG cb, LONG *pcb)<br />
{<br />
 <br />
    CString *pTempString = (CString*) dwCookie;<br />
<br />
    pTempString->AppendFormat("%s",pbBuff);<br />
<br />
    *pcb = pTempString->GetLength();<br />
<br />
    return 0;<br />
}<br />
void CMyTestDlg::OnBnClickedButton5()<br />
{<br />
   EDITSTREAM es;<br />
<br />
   es.dwCookie = (DWORD) &m_szRTF;<br />
   es.pfnCallback = MyStreamOutCallback; <br />
   m_rtfAuswertung.StreamOut(SF_RTF, es);<br />
<br />
}<br />
<br />

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.