C++ windows 内存泄漏定位

使用<crtdbg.h>的接口来定位内存泄漏问题,请注意只能在Debug下进行调试,主要有如下接口:

_CrtDumpMemoryLeaks();//打印所有内存泄漏信息

_CrtMemDifference(&s3, &s1, &s2)//判断检监测点1和监测点2是否不同

_CrtMemDumpStatistics(&s3);//打印泄漏内存

 

代码如下:

#define _CRTDBG_MAP_ALLOC
#include <crtdbg.h>
#include <iostream>

void TestLeak()
{
    char* p = new char[100];
}

_CrtMemState s1, s2, s3;

int main(int argc, char *argv[])
{
    _CrtMemCheckpoint(&s1);//监测点1

    TestLeak();

    _CrtMemCheckpoint(&s2);//监测点2

    if (_CrtMemDifference(&s3, &s1, &s2))//判断检监测点1和监测点2是否不同
    {
        _CrtMemDumpStatistics(&s3);//打印泄漏内存
    }

    _CrtDumpMemoryLeaks();//打印所有内存泄漏信息
    system("pause");
    return 0;
}


_CrtMemDumpStatistics(&s3);输出信息如下,说明TestLeak()函数申请了有100字节的内存,尚没有释放;

0 bytes in 0 Free Blocks.
100 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: 100 bytes.
Total allocations: 100 bytes.

 

_CrtDumpMemoryLeaks();输出信息如下:

可以看到有100字节内存泄漏,位置为0x00000000000DC480。即TestLeak()函数中申请内存的位置;

Detected memory leaks!
Dumping objects ->
{75} normal block at 0x00000000000DC480, 100 bytes long.
  Data: <                > CD CD CD CD CD CD CD CD CD CD CD CD CD CD CD CD
Object dump complete.
posted @ 2018-09-28 18:10  天逸笛仙  阅读(1220)  评论(0编辑  收藏  举报