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This section of the archives stores flipcode's complete Developer Toolbox collection, featuring a variety of mini-articles and source code contributions from our readers.

 

  Memory Leaks In VC
  Submitted by



I recently found out that this little trick to detect memory leaks in VC isn't that well known to coders all around, and since FlipCode has been an inspiration and a source of information for me for so long time, I thought it would be time for me to contribute with a little tip of the day.

How to detect memory leaks in Visual C++:

To enable memory leak detection in VC put the following in your code (winmain for example):

#ifndef NDEBUG

int flag = _CrtSetDbgFlag(_CRTDBG_REPORT_FLAG); // Get current flag flag |= _CRTDBG_LEAK_CHECK_DF; // Turn on leak-checking bit _CrtSetDbgFlag(flag); // Set flag to the new value #endif



I've been using this trick quite a while to detect memory leaks directly in VC. It works for debugbuilds executed in debugmode (F5) and it will report any leaks to the output window when you exit the application. The output isn't very usefull, but it can be used to detect if there are any leaks at all.



It is my experience that You have to use the leak detection from the beginning of a project and continue to keep the leaks to a zero throughout the progression of the project since this is your only chance to narrow down where the leaks are located whenever a new one occur. If You try to use the leak detection on older projects You will probably find several 100's of leaks which IMHO is nearly impossible to narrow down and fix due to the bad quality of the output.

Best regards
Thomas Rued
Digital Arts

The zip file viewer built into the Developer Toolbox made use of the zlib library, as well as the zlibdll source additions.

 

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