problem for memory leak detection in VS 2010

Question

1.00/5 (2 votes)

See more:

VS2010

Hi,
i define uafxcwd.lib;LIBCMTD.lib in project settings, Additional dependency
my project is build in VS2010.

now i have problem to find memory leaks. because by adding this code:

#if defined(_DEBUG)
     #define _CRTDBG_MAP_ALLOC
     #include <stdlib.h>
     #include <crtdbg.h>
     #define DEBUG_NEW new( _NORMAL_BLOCK, __FILE__, __LINE__ )
     #define new DEBUG_NEW
#endif

my project will be errors:

void* __cdecl operator new(unsigned int .... already defined in ...
void* __cdecl operator delete(void*.... already defined in ...

Posted 23-Dec-13 20:59pm

Zon-cpp

Add a Solution

Comments

Sergey Alexandrovich Kryukov 24-Dec-13 3:14am

How the compilation errors can be related to memory leaks? :-)
By the way, if you did not use any memory debugging, how do you know that you have a leak? If you, for example, just looked at Task Manager, you should not trust it.
—SA

[no name] 24-Dec-13 5:08am

This comment bears no relation to the question. None of us can read minds. It is up to you to make the problem and the question clear to others.

Zon-cpp 24-Dec-13 5:41am

visual studio 2010 report memory leak in output window like this: Detected memory leaks! Dumping objects -> {18} normal block at 0x00780E80, 64 bytes long. Data: < > CD CD CD CD CD CD CD CD CD CD CD CD CD CD CD CD But , it doesn't show name of the file and the line number where the leaked memory is first allocated.

Sergey Alexandrovich Kryukov 24-Dec-13 11:00am

This is because there is no such point. If you allocate some memory, it may or may not be deallocated some time later, the point of allocation is not a point of a leak. And if deallocation is absent, this is the absence of some code fragment, not a point of a leak.

You need to use one of the memory debuggers, that's it.

—SA

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Answer 1 · 2013-12-24T05:01:00

Solution 2

Please see my comments to the question. Consider using one of the memory debuggers: http://en.wikipedia.org/wiki/Memory_debugger#List_of_memory_debugging_tools[^].

—SA

Posted 24-Dec-13 5:01am

Sergey Alexandrovich Kryukov

User 59241 · Answer 2 · 2013-12-23T21:50:00

Solution 1

The code you add should be:

C++

#define _CRTDBG_MAP_ALLOC 
#include <stdlib.h>
#include <crtdbg.h>

#ifdef _DEBUG
   #ifndef DBG_NEW
      #define DBG_NEW new ( _NORMAL_BLOCK , __FILE__ , __LINE__ )
      #define new DBG_NEW
   #endif
#endif  // _DEBUG</crtdbg.h></stdlib.h>

Effective only in debug build.

http://msdn.microsoft.com/en-us/library/x98tx3cf(v=vs.100).aspx[^]

There are also comments at the bottom of this link page.

Posted 23-Dec-13 21:50pm

User 59241

Updated 23-Dec-13 21:55pm

v2

Comments

Zon-cpp 24-Dec-13 5:48am

But this code conflict with uafxcwd.lib (added in "Additional dependency")

Zon-cpp 25-Dec-13 4:59am

my project is console and MFC then i don't use of #define DBG_NEW new