Question

我正在尝试检测内存泄漏，我正在使用make _CRTDBG_MAP_ALLOC宏来查找泄漏区域。所以我定义MACRO如下：

#ifdef _DEBUG
    #define _CRTDBG_MAP_ALLOC
#include <stdlib.h>
#include <crtdbg.h>
    #define DEBUG_NEW new(_NORMAL_BLOCK, __FILE__, __LINE__)
    #define new DEBUG_NEW
#endif

在我的代码中，我有：

UINT SomeFunThread( LPVOID pParam )
{
   _CrtMemState crtMemStateStart;
    _CrtMemState crtMemStateFinish;

    _CrtMemCheckpoint(&crtMemStateStart);


    // My suspisious code


     _CrtMemCheckpoint(&crtMemStateFinish);

      int nDifference(0);
      _CrtMemState crtMemStateDifference;
      nDifference = _CrtMemDifference(&crtMemStateDifference, &crtMemStateStart, &crtMemStateFinish);

    if(nDifference > 0)
        _CrtDumpMemoryLeaks();

    return 0;
}

（感谢Tushar Jadhav：Memory consumption increases quickly, then drops very slowly; memory leak?）

但输出显示如下：

Detected memory leaks!
Dumping objects ->
{124058} normal block at 0x0000000031DED080, 24 bytes long.
 Data: < 0      ` $     > C8 30 F7 EF FE 07 00 00 60 D2 24 1D 00 00 00 00

而不是像这样：

Detected memory leaks!
Dumping objects ->
C:\PROGRAM FILES\VISUAL STUDIO\MyProjects\leaktest\leaktest.cpp(20) : {18} 
normal block at 0x00780E80, 64 bytes long.
 Data: <                > CD CD CD CD CD CD CD CD CD CD CD CD CD CD CD CD
Object dump complete.

那么如何让这个显示泄漏的文件名和位置？

Answer 1

在我的情况下，我最终将this线程中的内容包含在我的代码中。这会覆盖new运算符，并包含文件名和行号以便以后打印。不确定这是否仅适用于Visual Studio。

#define _CRTDBG_MAP_ALLOC
#include <crtdbg.h>
#ifdef _DEBUG
#define DEBUG_NEW new(_NORMAL_BLOCK, __FILE__, __LINE__)
#define new DEBUG_NEW
#endif

来自参考来源的整个测试代码是：

#define _CRTDBG_MAP_ALLOC
#include<iostream>
#include <crtdbg.h>
#ifdef _DEBUG
    #define DEBUG_NEW new(_NORMAL_BLOCK, __FILE__, __LINE__)
    #define new DEBUG_NEW
#endif

int main() 
{
    char *a = new char[10];
    _CrtDumpMemoryLeaks();
    return 0; 
}

在我的测试用例中打印：

Detected memory leaks!
Dumping objects ->
e:\test\testapplication\testapplication.cpp(11) : {144} normal block at 0x007F4EF0, 10 bytes long.
 Data: <          > CD CD CD CD CD CD CD CD CD CD 
Object dump complete.

Answer 2

如果在该cpp文件中打开CRT，似乎只显示泄漏线。

_CRTDBG_MAP_ALLOC未显示文件名

2 个答案: