MFC环境osgEarth开发程序内存泄露的解决办法

最近研究开源数据地球系统osgearth的开发，基于vc.net2010，采用sp1包里的ribbon风格搭建mfc的单文档应用程序，按照osgearth提供的example例子完成简单的地球显示和模型加载，每次系统退出时发现大量的内存泄露问题，还以为是因为智能指针没用好，自己犯了基础的错误，将自己的代码看了又看没找到内存泄露的原因，最后网上找到了原因，应该是MFC的一个bug或issue，如下：

There is a known issue/BUG with MFC, were MFC makes a call to

_CrtDumpMemoryLeaks() in the destructor of the _AFX_DEBUG_STATE, followed by _CrtSetDbgFlag() which sets it to ~_CRTDBG_LEAK_CHECK_DF (therefor disabling memory leak test at *true* program exit) This destructor is called at exit (i.e. atexit()), but before
statics residing in dlls and others are destroyed, resulting in many false memory leaks are reported

参考资料链接是：

1. Why does my OSG MFC based application show memory leaks。

2. 在MFC框架下使用osg报内存泄露的解决办法

简单说一下泄露问题的发现和解决过程：

让输出窗口在程序退出时输出内存泄露信息，需要在可能存在内存泄露的文件头部添加下面的宏：

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

运行程序，通过程序的关闭按钮关闭程序后，返回vs观察其输出窗口，如果有内存泄露会出现类似下面的提示信息：
.....

{184} normal block at 0x00FB7510, 24 bytes long.

Data: < u u u > 10 75 FB 00 10 75 FB 00 10 75 FB 00 CD CD CD CD

{183} normal block at 0x00FB7150, 896 bytes long.

Data: < > 00 00 00 00 CD CD CD CD CD CD CD CD CD CD CD CD

{181} normal block at 0x00FB70A0, 24 bytes long.

Data: < a > D8 61 15 00 FF FF FF FF 00 00 00 00 00 00 00 00

{180} normal block at 0x00FB6FE0, 128 bytes long.

Data: < > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

{179} normal block at 0x00FB6F20, 128 bytes long.

Data: < > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

{178} normal block at 0x00FB6E60, 128 bytes long.

Data: < > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00

{137} normal block at 0x00FB6D98, 136 bytes long.

Data: < WC > D8 57 43 10 00 00 00 00 01 00 00 00 00 00 00 00

{135} normal block at 0x00FB6C58, 64 bytes long.

Data: <OpenThread v1.2p> 4F 70 65 6E 54 68 72 65 61 64 20 76 31 2E 32 70

....

这个是网上给出的解决方法：

In your MFC application.

. Goto project settings. In there, make the following changes for theDebug build.

. General->Use of MFC->Use Standard Windows Libraries.

. Add _AFXDLL to C/C++->Preprocessor->Preprocessor Definitions.

. Add mfc80??.lib (in my case it is mfc80ud.lib) as a first dependency or at least before osg libs to Linker->Input->Additional

Dependencies.

还需要将unicode变为多字节编码，重新clean build 通过。