Visual Studio 内存泄漏检测方法
非MFC程序可以用以下方法检测内存泄露：
1.程序开始包含如下定义：
#ifdef _DEBUG
#define DEBUG_CLIENTBLOCK new( _CLIENT_BLOCK, __FILE__, __LINE__)
#else
#define DEBUG_CLIENTBLOCK
#endif // _DEBUG
#define _CRTDBG_MAP_ALLOC
#include <stdlib.h>
#include <crtdbg.h>
#ifdef _DEBUG
#define new DEBUG_CLIENTBLOCK
#endif // _DEBUG
2.程序中添加下面的函数：
_CrtSetDbgFlag(_CRTDBG_ALLOC_MEM_DF|_CRTDBG_LEAK_CHECK_DF);
Debug版本程序运行结束后如有内存泄漏，输出窗口中会显示类似信息：
Detected memory leaks!
Dumping objects ->
g:\programs\test\test.cpp(16) : {51} client block at 0x00385C58, subtype 0, 4 bytes long.
Data: < > CD CD CD CD
Object dump complete.
MFC程序内存泄漏检测方法：
1.在 CMyApp 中添加如下三个 CMemoryState 类的成员变量：
#ifdef _DEBUG
protected:
CMemoryState m_msOld, m_msNew, m_msDiff;
#endif // _DEBUG
2.在 CMyApp::InitInstance() 中添加如下代码：
#ifdef _DEBUG
m_msOld.Checkpoint();
#endif // _DEBUG
3.在 CMyApp::ExitInstance() 中添加如下代码：
#ifdef _DEBUG
m_msNew.Checkpoint();
if (m_msDiff.Difference(m_msOld, m_msNew))
{
afxDump<<"\nMemory Leaked :\n";
m_msDiff.DumpStatistics();
afxDump<<"Dump Complete !\n\n";
}
#endif // _DEBUG
Debug版本程序运行结束后如有内存泄漏，输出窗口中会显示类似信息：
Memory Leaked :
0 bytes in 0 Free Blocks.
8 bytes in 1 Normal Blocks.
0 bytes in 0 CRT Blocks.
0 bytes in 0 Ignore Blocks.
0 bytes in 0 Client Blocks.
Largest number used: 8825 bytes.
Total allocations: 47506 bytes.
Dump Complete !
Detected memory leaks!
Dumping objects ->
g:\programs\chat\chatdlg.cpp(120) : {118} normal block at 0x00D98150, 8 bytes long.
Data: < > A8 7F D9 00 01 00 00 00
Object dump complete.