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Catching memory leaks

, 4 Oct 2000
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How catch memory leaks with very little effort
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    I would like share with you some experience in catching memory leaks. In most case it is a long processe and required additional tools like PurifyNT or BoundsChecker. Actually, catching simple memory leaks is possible by using the Microsoft exported functionality.

    In a simple case you should add several lines to 'StdAfx.h'

    #ifdef _DEBUG
       #define _CRTDBG_MAP_ALLOC // include Microsoft memory leak detection procedures
       #define _INC_MALLOC	     // exclude standard memory alloc procedures

    Note: it should be before the 'include' directives.

    In the enclosed example you will find an example with a memory leak. To see how it works you should run program under the debugger. When the program finishes you will see in the the 'Output' window, 'Debug' tab the following message.

    Detected memory leaks!
    Dumping objects -> D:\Projects\CrtDbg\CrtDbg.cpp(25) : {53} normal block at 0x002F26C0, 10 bytes long.
    Data: <MemoryLeak> <MEMORYLEAK> 4D 65 6D 6F 72 79 4C 65 61 6B 
    Object dump complete.

    In more advanced memory management cases you should look in the 'AfxMem.cpp' file in MFC source directory. File contents plenty of memory management functions.

    I have written a class CMemDiff that wraps CMemoryState and helps track memory leaks. Just include the MemDiff files in your project. A global variable of type CMemDiff is declared and it's constructor and destructor will check the state of your memory at the start and end of your program and report any leaks.


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    About the Author

    Audrius Vasiliauskas
    Business Analyst
    Lithuania Lithuania
    No Biography provided

    Comments and Discussions

    GeneralUnhandled exception in ntdll Pinmembered welch16-Apr-09 13:59 
    GeneralRe: Unhandled exception in ntdll PinmemberAudrius Vasiliauskas18-Apr-09 7:53 
    Generalerror C2065: 'alloca' : undeclared identifier Pinmembersafety_ruk25-May-06 23:13 
    GeneralRe: error C2065: 'alloca' : undeclared identifier Pinmemberakulkarni19-Jul-06 12:42 
    GeneralRe: error C2065: 'alloca' : undeclared identifier Pinmemberakulkarni19-Jul-06 12:42 
    Questionafxpriv.h Pinmemberehh8-Sep-05 9:49 
    i placed the #defines in stdafx.h, and most source files in my project compiled, but not the ones that included afxpriv.h--these files caused compile errors in malloc.h, for example, when it gets to calloc's prototype, it says:

    second C linkage of overloaded function '_calloc_dbg' not allowed

    please advise!

    QuestionHow to find real leaked point Pinmembermurakami15-Aug-05 23:44 
    AnswerRe: How to find real leaked point PinmemberTim Read29-May-06 7:23 
    AnswerRe: How to find real leaked point Pinmembermurakami29-May-06 18:01 
    GeneralRe: How to find real leaked point PinmemberTim Read31-May-06 0:20 
    GeneralDebugging a DLL - no StdAfx.h available Pinmemberbschorre30-Mar-05 3:00 
    GeneralAn extremely useful tip PinsussAnonymous11-Apr-04 20:52 
    GeneralRe: An extremely useful tip Pinmemberworksopbenny7-Jun-04 23:54 
    GeneralSoooooooo Coooooool Pinmemberinternal10-Jun-04 17:28 
    GeneralRe: An extremely useful tip Pinmemberpeterboulton9-Dec-04 2:24 
    GeneralRe: An extremely useful tip PinmemberRainKing Fool4-Oct-05 16:43 
    Generalabout VC7 PinmemberMuhammad Ahmed5-Feb-04 1:14 
    GeneralNot Getting the path where actully memory leak occuring PinmemberJaymin5-Aug-03 3:26 
    GeneralMemory Leak PinsussSivakumar R28-Mar-03 0:59 
    Generalabout call stack PinmemberNing Cao7-Jan-03 16:55 
    GeneralRe: about call stack PinmemberMike Nordell7-Jan-03 17:25 
    GeneralRe: about call stack PinmemberNing Cao7-Jan-03 17:35 
    GeneralRe: about call stack PinmemberKita24-Jun-03 22:33 
    Generalabout custom memory management PinmemberNing Cao7-Jan-03 16:50 
    GeneralMemory leak detection PinmemberYud27-Feb-01 22:48 

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