VLD為vc++下的記憶體洩露檢測工具
1、首先下載安裝vld，直接下載安裝包，安裝過程中會直接新增環境變數。
2、在安裝目錄下有vld.h, vldapi.h, vld.lib, vldmt.lib, vldmtdll.lib, dbghelp.dll等檔案，在使用的時候在附加包含附錄中新增inlude目錄或者將.h檔案拷貝到工程預設的include目錄下

，在附加庫目錄中新增vld安裝目錄下的lib/Win32或者lib/Win64庫目錄或者將相應庫目錄下的lib檔案複製到工程預設的lib庫目錄下即可。

3、在使用的時候，在相應的檔案中包含vld.h標頭檔案，並新增條件編譯語句，則在Debug下，如果有記憶體洩露將會有相應提示。

#ifdef _DEBUG
#include <vld.h>
#endif // DEBUG
#include <iostream>
#include <windows.h>
using namespace std;
int main(int argc, char** argv)
{
    char* vldPtr = new char;
    char* vldPtr2 = new char[100];
    Sleep(1000);
    //delete vldPtr;
    //delete[]vldPtr2;
    return 0;
}

除錯執行，將會出現相應的記憶體洩露資訊，雙擊發生記憶體洩露資訊中的定位資訊，會自動跳到發生記憶體洩露的語句，如下面的：
e:\data\project\myofferinterviewquestions\visualleakdebugtest\vldtest.cpp (13): VisualLeakDebugTest.exe!main() + 0x7 bytes
以及
e:\data\project\myofferinterviewquestions\visualleakdebugtest\vldtest.cpp (14): VisualLeakDebugTest.exe!main() + 0x7 bytes

Visual Leak Detector read settings from: E:\data\C++\Visual Leak Detector\vld.ini
Visual Leak Detector Version 2.5 installed.
WARNING: Visual Leak Detector detected memory leaks!
---------- Block 1 at 0x006F9998: 1 bytes ----------
  Leak Hash: 0x877EEED5, Count: 1, Total 1 bytes
  Call Stack (TID 3956
 
):
    MSVCR120D.dll!operator new()
    e:\data\project\myofferinterviewquestions\visualleakdebugtest\vldtest.cpp (13): VisualLeakDebugTest.exe!main() + 0x7 bytes
    f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c (466): VisualLeakDebugTest.exe!mainCRTStartup()
    KERNEL32.DLL!BaseThreadInitThunk() + 0x24 bytes
    ntdll.dll!RtlInitializeExceptionChain() + 0x8F bytes
    ntdll.dll!RtlInitializeExceptionChain() + 0x5A bytes
  Data:
    CD                                                           ........ ........
---------- Block 2 at 0x00704208: 100 bytes ----------
  Leak Hash: 0xE714C3E0, Count: 1, Total 100 bytes
  Call Stack (TID 3956):
    MSVCR120D.dll!operator new()
    f:\dd\vctools\crt\crtw32\stdcpp\newaop.cpp (6): VisualLeakDebugTest.exe!operator new[]() + 0x9 bytes
    e:\data\project\myofferinterviewquestions\visualleakdebugtest\vldtest.cpp (14): VisualLeakDebugTest.exe!main() + 0x7 bytes
    f:\dd\vctools\crt\crtw32\dllstuff\crtexe.c (466): VisualLeakDebugTest.exe!mainCRTStartup()
    KERNEL32.DLL!BaseThreadInitThunk() + 0x24 bytes
    ntdll.dll!RtlInitializeExceptionChain() + 0x8F bytes
    ntdll.dll!RtlInitializeExceptionChain() + 0x5A bytes
  Data:
    CD CD CD CD    CD CD CD CD    CD CD CD CD    CD CD CD CD     ........ ........
    CD CD CD CD    CD CD CD CD    CD CD CD CD    CD CD CD CD     ........ ........
    CD CD CD CD    CD CD CD CD    CD CD CD CD    CD CD CD CD     ........ ........
    CD CD CD CD    CD CD CD CD    CD CD CD CD    CD CD CD CD     ........ ........
    CD CD CD CD    CD CD CD CD    CD CD CD CD    CD CD CD CD     ........ ........
    CD CD CD CD    CD CD CD CD    CD CD CD CD    CD CD CD CD     ........ ........
    CD CD CD CD                                                  ........ ........
Visual Leak Detector detected 2 memory leaks (173 bytes).
Largest number used: 173 bytes.
Total allocations: 173 bytes.
Visual Leak Detector is now exiting.
程式“[15164] VisualLeakDebugTest.exe”已退出，返回值為 0 (0x0)。

如果沒有發生記憶體洩露，那麼返回;

Visual Leak Detector read settings from: E:\data\C++\Visual Leak Detector\vld.ini
Visual Leak Detector Version 2.5 installed.
No memory leaks detected.
Visual Leak Detector is now exiting.
程式“[3468] VisualLeakDebugTest.exe”已退出，返回值為 0 (0x0)。