VC 内存泄漏

最新推荐文章于 2024-01-23 23:07:45 发布

hpghy123456

最新推荐文章于 2024-01-23 23:07:45 发布

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分类专栏： Window编程文章标签：编程 file leak delete object exe

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本文介绍了在VC中使用MS CRT检测内存泄漏的方法，通过示例代码展示了如何使用.DEBUG宏定义来跟踪new、malloc和realloc操作，并展示了内存泄漏检测的输出结果，帮助理解内存泄漏定位。

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最近在学习VC中MS CRT对内存泄漏的处理。自己总结了一下，写了一小段对new、malloc、realloc检测的代码：

#include "stdafx.h"
#include <Windows.h>
#include <crtdbg.h>

#ifdef _DEBUG
#define DEBUG_CLIENTBLOCK new( _CLIENT_BLOCK, __FILE__, __LINE__)
#else
#define DEBUG_CLIENTBLOCK
#endif

#include <crtdbg.h>
#ifdef _DEBUG
#define new DEBUG_CLIENTBLOCK
#define malloc(x) _malloc_dbg( x, _NORMAL_BLOCK, __FILE__, __LINE__)
#define realloc(x, y) _realloc_dbg( x, y, _NORMAL_BLOCK, __FILE__, __LINE__)
#endif

class A
{
public:
A() { a1 = new int; a2 = (char*)malloc(12);}
~A() { /*delete a1; free(a2);*/ }
int *a1;
char *a2;
};

int _tmain(int argc, _TCHAR* argv[])
{
_CrtSetDbgFlag ( _CRTDBG_ALLOC_MEM_DF | _CRTDBG_LEAK_CHECK_DF );

int* p = new int;
//delete p;
char * y = (char*)malloc(10);
//free(y);
char * x = (char*)malloc(5);
x[0] = 'm';
//free(x);
realloc( x, 100);
A a;
A * ap = new A();

return 0;
}

输出结果如下：

Detected memory leaks!
Dumping objects ->
g:/windows核心编程代码/testmemoryleak/testmemoryleak1/testmemoryleak1.cpp(25) : {100} normal block at 0x00394BB8, 12 bytes long.
Data: <            > CD CD CD CD CD CD CD CD CD CD CD CD
g:/windows核心编程代码/testmemoryleak/testmemoryleak1/testmemoryleak1.cpp(25) : {99} client block at 0x00394B78, subtype 0, 4 bytes long.
Data: <    > CD CD CD CD
g:/windows核心编程代码/testmemoryleak/testmemoryleak1/testmemoryleak1.cpp(44) : {98} client block at 0x00394B30, subtype 0, 8 bytes long.
Data: <xK9 K9 > 78 4B 39 00 B8 4B 39 00
g:/windows核心编程代码/testmemoryleak/testmemoryleak1/testmemoryleak1.cpp(25) : {97} normal block at 0x00397FE0, 12 bytes long.
Data: <            > CD CD CD CD CD CD CD CD CD CD CD CD
g:/windows核心编程代码/testmemoryleak/testmemoryleak1/testmemoryleak1.cpp(25) : {96} client block at 0x00397FA0, subtype 0, 4 bytes long.
Data: <    > CD CD CD CD
g:/windows核心编程代码/testmemoryleak/testmemoryleak1/testmemoryleak1.cpp(42) : {95} normal block at 0x00397F00, 100 bytes long.
Data: <m               > 6D CD CD CD CD CD CD CD CD CD CD CD CD CD CD CD
g:/windows核心编程代码/testmemoryleak/testmemoryleak1/testmemoryleak1.cpp(37) : {93} normal block at 0x00397EB8, 10 bytes long.
Data: <          > CD CD CD CD CD CD CD CD CD CD
g:/windows核心编程代码/testmemoryleak/testmemoryleak1/testmemoryleak1.cpp(35) : {92} client block at 0x00397E78, subtype 0, 4 bytes long.
Data: <    > CD CD CD CD
Object dump complete.

上面的结果可以在DebugView中查看！或是按F10（F5）到

mainret = wmain(argc, argv, envp);
#else /* WPRFLAG */
__initenv = envp;
mainret = main(argc, argv, envp);
#endif /* WPRFLAG */

#endif /* _WINMAIN_ */

            /*
             * Note that if the exe is managed app, we don't really need to
             * call exit or _c_exit. .cctor should be able to take care of
             * this.
             */
            if ( !managedapp )
                exit(mainret);
时，也可以在输出窗口看到。