Memory Leaks

[phlebas]

Does anyone know of any usefull VC macros, addons, anythings that will help me track what objects have been allocated on the heap but not deallocated?
Regards,

[Gomez Addams]

There are two I use ALL THE TIME. I emphasize this because they are quite
effective and help you track down memory leaks very well. The first is this :

#ifdef _DEBUG
#define new DEBUG_NEW
#endif // _DEBUG

Use this in C++ programs. Check the docs for specific usage instructions.
I think that it must follow IMPLEMENT_DYNCREATE statements to work correctly.
The second thing I always do is this :

#ifdef _DEBUG
#define _CRTDBG_MAP_ALLOC
#include <crtdbg.h>
#endif

This is for use with standard C run-time library stuff.
This will help track malloc and free calls.
Lastly, I use this little function :

void SetMemDbgFlag( void )
{
#ifdef _DEBUG

int tmp = _CrtSetDbgFlag( _CRTDBG_REPORT_FLAG );
tmp |= _CRTDBG_LEAK_CHECK_DF;
tmp &= ~(_CRTDBG_CHECK_CRT_DF );
_CrtSetDbgFlag( tmp );

#endif // _DEBUG
}


This helps enable memory leak detection. I call this in InitInstance of MFC apps.
When you use these things, it also pays off to use CGdiObject-derived objects
for drawing because they work with the memory tracking and their destructors
will destroy the resource automatically. This helps you track resource leaks.
Using these techniques I have made my app leak-free so that it runs for months
at a time with no problems.