Memory Leak in

Posted on 2004-08-31
Last Modified: 2008-02-07
I am running a simple ADO test.   I am using VC++ 6 on Windows XP.  When evaluating the code with Rational Purify I get a memeory leak.   What am I doing wrong?


#include "StdAfx.h"
#import "c:\Program Files\Common Files\System\ADO\msado15.dll" \
              rename("EOF", "EndOfFile")

int APIENTRY WinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine,
                     int       nCmdShow)

      ADODB::_ConnectionPtr      _cnn;

            HRESULT hr;
            hr    = _cnn.CreateInstance( __uuidof(ADODB::Connection ) );
            _cnn->Open("DSN=ZIPS", L"",L"", ADODB::adModeUnknown);
      }catch (...)

      return 0;


[W] MLK: Memory leak of 4096 bytes from 1 block allocated in ADODB::Connection15::Open(_bstr_t,_bstr_t,_bstr_t,long) [UnitTests.exe]
        Distribution of leaked blocks
        Allocation location
            VirtualAlloc   [KERNEL32.dll]
            ADODB::Connection15::Open(_bstr_t,_bstr_t,_bstr_t,long) [msado15.tli:367]
                inline HRESULT Connection15::Open ( _bstr_t ConnectionString, _bstr_t UserID, _bstr_t Password, long Options ) {
             =>     HRESULT _hr = raw_Open(ConnectionString, UserID, Password, Options);
                    if (FAILED(_hr)) _com_issue_errorex(_hr, this, __uuidof(this));
                    return _hr;
Question by:nicoleheritage
  • 3
  • 2

Author Comment

ID: 11942017
I am using an ODBC connection to mircosoft Access for testing

Accepted Solution

jacobhoover earned 500 total points
ID: 11947394
Everything looks fine.... I personallly moved away from ADO and I use pure ODBC API.  I found a nifty little library from Gehtsoft (GSODBC) that wrapped up most all of the functionality I needed and best of all I was able to eliminate COM from my project.

It would also be interesting to know if Rational wasn't making a mistake with tracking the VirtualAlloc.  One could do a test and run your app 50 times and see if it truely is leaking the memory or if Purify wasn't mistaken.

Just my 2 cents...

Author Comment

ID: 11966808
I agree with your 2 cents and will be heading in that directions.



Expert Comment

ID: 11968444
If you need a copy of the ODBC library, I would be more that happy to supply you one...  I think I origionally got mine off off but I remember it taking some time for me to find the link.

Expert Comment

ID: 11968487
Sure, no more than do I say that than do I google it and get a couple hits on it.

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Whether you've completed a degree in computer sciences or you're a self-taught programmer, writing your first lines of code in the real world is always a challenge. Here are some of the most common pitfalls for new programmers.
Although it can be difficult to imagine, someday your child will have a career of his or her own. He or she will likely start a family, buy a home and start having their own children. So, while being a kid is still extremely important, it’s also …
An introduction to basic programming syntax in Java by creating a simple program. Viewers can follow the tutorial as they create their first class in Java. Definitions and explanations about each element are given to help prepare viewers for future …
With the power of JIRA, there's an unlimited number of ways you can customize it, use it and benefit from it. With that in mind, there's bound to be things that I wasn't able to cover in this course. With this summary we'll look at some places to go…

896 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

18 Experts available now in Live!

Get 1:1 Help Now