How to compare states of memory in memory leak?

I have recently started studying about the memory leak. And also found that some problems in uTorrent are caused because of memory leaks. Now I wanted to know how can I compare states of memory in memory leak? Since, I am not knowing much about it, please explain me in details. Hoping that someone hanging out there will help me soon.!! :rolleyes:

To conclude whether a memory leak took place in a section of code, you can take snapshots of the state of memory prior to and after the section, and compare the two states with _CrtMemDifference :

Code:

---

_CrtMemCheckpoint (& S1);
 / / Memory allocations take place here
 _CrtMemCheckpoint (& S2);

 if (_CrtMemDifference (& s3, & s1, & s2))
    _CrtMemDumpStatistics (& S3);

---

Another modus operandi for detecting memory leaks is to take snapshots of the state of the application memory in certain key points. The CRT provides a type of structure, _CrtMemState, which you can use to store a snapshot of the memory :

_CrtMemState S1, s2, s3;

To take a snap of the state of memory at a prearranged point, pass a structure to function _CrtMemState _CrtMemCheckpoint . This function fills the arrangement with a snapshot of the current state of memory :

• _CrtMemCheckpoint (& S1);

You can dump the contents of a structure _CrtMemState at any point in passing the structure to function _CrtMemDumpStatistics :

• _CrtMemDumpStatistics (& S1);

As its name suggests, _CrtMemDifference compares two memory states (s1 and s2) and produces a result (s3), which corresponds to the difference between the two states. By placing calls to _CrtMemCheckpoint at the beginning and the end of your program, then using _CrtMemDifference to compare the results, you have another way to search for memory leaks. If a leak is detected, you can use calls to _CrtMemCheckpoint to split your program and locate the leak with a binary search technique.