一、VLD
参考博客：
Visual Leak Detector on Visual C++ 2017
Visual Leak Detector on Visual C++ 2017
https://archive.codeplex.com/?p=vld
https://kinddragon.github.io/vld/
Project Description
Visual Leak Detector is a free, robust, open-source memory leak detection system for Visual C++.
It's pretty easy to use. After installing it, you just need to tell Visual C++ where to find the included header and library file.
Then it can be used with any C/C++ project simply by adding the following line to your code:
#include <vld.h>
When you run your program under the Visual Studio debugger, Visual Leak Detector will output a memory leak report at the end of your debugging session. The leak report includes the full call stack showing how any leaked memory blocks were allocated. Double-click on a line in the call stack to jump to that file and line in the editor window.
It's a very effective way to quickly diagnose, and fix, memory leaks in C/C++ applications.
The main difference between the CRT Debug Library and VLD, is that Visual Leak Detector shows you the complete callstack used for memory allocation has led to the leak.
For example:
---------- Block 1199 at 0x04BE1058: 136 bytes ----------
Call Stack:
d:\Foobar\FooLog.cpp (26): FooLog::getInstance
d:\Foobar\FooMain.cpp (75): FooMain::init
f:\dd\vctools\crt_bld\self_x86\crt\src\crtexe.c (578): __tmainCRTStartup
f:\dd\vctools\crt_bld\self_x86\crt\src\crtexe.c (403): WinMainCRTStartup
0x759A3677 (File and line number not available): BaseThreadInitThunk
0x770C9D42 (File and line number not available): RtlInitializeExceptionChain
0x770C9D15 (File and line number not available): RtlInitializeExceptionChain
Data:
9C 33 2D 6B 74 2A 2D 6B C8 11 BE 04 00 00 00 00 .3-kt*-k ........
00 00 00 00 70 14 BB 6C 70 14 BB 6C 00 00 00 00 ....p..l p..l....
00 00 00 00 68 14 BB 6C 68 14 BB 6C 00 00 00 00 ....h..l h..l....
00 00 00 00 6C 14 BB 6C 6C 14 BB 6C 20 12 BE 04 ....l..l l..l....
00 00 00 00 CD 00 CD CD 00 00 00 00 01 CD CD CD ........ ........
68 14 BB 6C 78 33 2D 6B 00 00 00 00 00 00 00 00 h..lx3-k ........
00 00 00 00 01 02 00 00 06 00 00 00 00 00 00 00 ........ ........
00 00 00 00 00 00 00 00 88 11 BE 04 5C 10 BE 04 ........ ....\...
00 00 00 00 20 CD CD CD ........ ........This software is provided "AS IS" without warranty of any kind.
The project was originally developed by Dan Moulding, but they are no longer supported. Features of version 2.0 are implemented by Arkadiy Shapkin (me).
Links
- Visual Leak Detector Previous Official Homepage http://sites.google.com/site/dmoulding/vld
- CodeProject article: Visual Leak Detector - Enhanced Memory Leak Detection for Visual C++
- Finding Memory Leaks Using the CRT Library
- Visual Leak Detector: Investigate Memory Leaks in Visual C++
二、演示代码：
示例代码：
#include <stdio.h>
#include <stdlib.h>
#include "vld.h"
typedef struct Data {
int a;
int b;
};
//指针函数 返回值是一个指向Data类型的地址
Data* f(int a, int b) {
Data *data = (Data *) malloc(sizeof(Data));
data->a = a;
data->b = b;
return data;
}
int main()
{
//调用指针函数
Data * myData = f(4, 5);
printf("f(4,5) =%d\t%d\n", myData->a, myData->b);
//free(myData);
//myData = NULL;
return 0;
}
分析上面没有将malloc申请的内存释放掉，会出现内存泄漏！
