Solved

AfxSocketInit() Mem Leak? Pls. Help...

Posted on 2000-03-16
6
498 Views
Last Modified: 2013-12-14
Hi,
I have a MFC (no GUI) application. It's a NT service and it's multithreaded by using the SDK not the MFC heavy stuff.
The application is statically linked to MFC.

I have the followings for initializing:


int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
      int      nRetCode = 0;
      // initialize MFC and print and error on failure
      if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
      {
            // TODO: change error code to suit your needs
            cerr << _T("Fatal Error: MFC initialization failed") << endl;
            nRetCode = 1;
      }

      WSADATA lpwsaData;
      if ( !AfxSocketInit( &lpwsaData ) )
      {
            cerr << _T("Fatal Error: Could NOT Initialize Windows Sockets!") << endl;
            nRetCode = 1;
      }
      ....
      
}

When I stop the application I get few lines of memory leaks:


[!!! Warning !!!]( 307): Detected memory leaks!
[!!! Warning !!!]( 307): Dumping objects ->
[!!! Warning !!!]( 307): sockcore.cpp(88) :
[!!! Warning !!!]( 307): {45}
[!!! Warning !!!]( 307): client block at 0x00C103A0, subtype 0, 28 bytes long.
[!!! Warning !!!]( 307): a CPtrList object at $00C103A0, 28 bytes long
[!!! Warning !!!]( 307): sockcore.cpp(86) :
[!!! Warning !!!]( 307): {44}
[!!! Warning !!!]( 307): client block at 0x00C103F0, subtype 0, 28 bytes long.
[!!! Warning !!!]( 307): a CMapPtrToPtr object at $00C103F0, 28 bytes long
[!!! Warning !!!]( 307): sockcore.cpp(84) :
[!!! Warning !!!]( 307): {43}
[!!! Warning !!!]( 307): client block at 0x00C10D40, subtype 0, 28 bytes long.
[!!! Warning !!!]( 307): a CMapPtrToPtr object at $00C10D40, 28 bytes long
[!!! Warning !!!]( 307): Object dump complete.



If I simply remove the AfxSocketInit() call all works perfect.
Why? As I see the AfxSocketInit() makes some memory leaks.
There is a question in the MSDN: Q193101 that says that the problem with multithreaded statically linked MFC applications and AfxSocketInit() has been solved in VS6SP3.
I do have VS6SP3.
What is wrong and how can I solve this ?

Thanks,
Corneliu

Corneliu I. Tusnea
Infopulse Romania

0
Comment
Question by:CorneliuTusnea
  • 3
  • 2
6 Comments
 

Expert Comment

by:wardkd
ID: 2627200
I have written winsock applications as NT services in the past with no problems. However, I didn't use any mfc extensions at all -use the straight winsock api and you'll have no problem.
0
 

Author Comment

by:CorneliuTusnea
ID: 2627264
Ok,
I understand you, buy I want to use CSockets :-)

Thanks anyway,
Corneliu.
0
 
LVL 9

Accepted Solution

by:
ShaunWilde earned 200 total points
ID: 2627400
you need to have a CWinApp object as this will destroy the structures for you when it terminates.

0
Highfive + Dolby Voice = No More Audio Complaints!

Poor audio quality is one of the top reasons people don’t use video conferencing. Get the crispest, clearest audio powered by Dolby Voice in every meeting. Highfive and Dolby Voice deliver the best video conferencing and audio experience for every meeting and every room.

 
LVL 9

Expert Comment

by:ShaunWilde
ID: 2627414
also have you tried a call to AfxSocketTerm() at the end - it isn't documentated but it does sit side by side with AfxSocketInit in the MFC source
0
 

Author Comment

by:CorneliuTusnea
ID: 2627422
Great,
The answer was no good, I already knew that, but the comment was excellent :-))

Thanks.
0
 
LVL 9

Expert Comment

by:ShaunWilde
ID: 2627425
(I have just looked deeper into the code and...)
forget AfxSocketTerm you'll have to go the CWinApp route for it to tidy up correctly.

0

Featured Post

Why You Should Analyze Threat Actor TTPs

After years of analyzing threat actor behavior, it’s become clear that at any given time there are specific tactics, techniques, and procedures (TTPs) that are particularly prevalent. By analyzing and understanding these TTPs, you can dramatically enhance your security program.

Join & Write a Comment

Article by: SunnyDark
This article's goal is to present you with an easy to use XML wrapper for C++ and also present some interesting techniques that you might use with MS C++. The reason I built this class is to ease the pain of using XML files with C++, since there is…
This article will show you some of the more useful Standard Template Library (STL) algorithms through the use of working examples.  You will learn about how these algorithms fit into the STL architecture, how they work with STL containers, and why t…
The viewer will learn how to use NetBeans IDE 8.0 for Windows to connect to a MySQL database. Open Services Panel: Create a new connection using New Connection Wizard: Create a test database called eetutorial: Create a new test tabel called ee…
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.

707 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

12 Experts available now in Live!

Get 1:1 Help Now