作者：朱金燦
來源：http://blog.csdn.net/clever101/

??????? 最近正在學(xué)習(xí)osg，從osgchina網(wǎng)站下下載了osg的debug版本庫，具體地址為：

OpenSceneGraph-2.8.2預(yù)編譯包（for vs9）下載

??????? 然后建了一個MFC的單文檔程序?qū)懸恍y試代碼，調(diào)試運行了一下，退出時出現(xiàn)大量的內(nèi)存泄露：
......
{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

??????? 開始我吃了一驚，上網(wǎng)搜了一下，找到了一個解決辦法：

Why does my OSG MFC based application show memory leaks

?? 這個網(wǎng)頁上給出的解決辦法是：

. 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.

我按照這個辦法一試，出現(xiàn)了一個鏈接錯誤：
1>msvcrtd.lib(crtexew.obj) : error LNK2019: unresolved external symbol _WinMain@16 referenced in function ___tmainCRTStartup
1>E:/OSG Play/Debug/osgSdi.exe : fatal error LNK1120: 1 unresolved externals
1>Build log was saved at "file://e:/OSG Play/osgSdi/Debug/BuildLog.htm"
1> osgSdi - 2 error(s), 0 warning(s)

?????? 之前我只是添加了附加庫mfc90ud.lib，這下我把msvcrtd.lib也加進去了，發(fā)現(xiàn)還是有這個錯誤。于是搜索了一下"error LNK2019: unresolved external symbol _WinMain@16 referenced in function ___tmainCRTStartup"，判斷可能是使用字符集不當(dāng)造成的。于是在選項里使用多字節(jié)字符集，附加庫使用mfc90d.lib。重新編譯之后好了，我想是不是因為我的osg的核心庫是基于多字節(jié)字符集生成而造成這個問題的呢？或許只有用unicode版本的osg庫一試才能知道。

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?????早上起來，想到了一個測試辦法，就是建一個單文檔程序，采用unicode字符集編譯，附加庫添加mfc90ud.lib，發(fā)現(xiàn)也會出現(xiàn)error LNK2019: unresolved external symbol _WinMain@16 referenced in function ___tmainCRTStartup的錯誤，但采用多字節(jié)字符集沒有問題。看來并不是osg庫的問題。

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轉(zhuǎn)載于:https://www.cnblogs.com/lanzhi/archive/2010/06/27/6471029.html

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