《COM技术内幕》第八章的问题

[firecityplans]

第八章中有个完整的例子，也就是在书的145页。不知有谁看过，还请大家劳驾一下了。书中给了两个组件，也就是两个清单8-3和8-4，不知道这两个程序能放到一起运行不。我试了一下，说是不行。问题出现如下的错误：
--------------------Configuration: Client - Win32 Debug--------------------
Linking...
CMPNT1.OBJ : error LNK2005: "public: virtual long __stdcall CFactory::QueryInterface(struct _GUID const &,void * *)" (?QueryInterface@CFactory@@UAGJABU_GUID@@PAPAX@Z) already defined in CMPNT2.OBJ
CMPNT1.OBJ : error LNK2005: "public: virtual unsigned long __stdcall CFactory::AddRef(void)" (?AddRef@CFactory@@UAGKXZ) already defined in CMPNT2.OBJ
CMPNT1.OBJ : error LNK2005: "public: virtual unsigned long __stdcall CFactory::Release(void)" (?Release@CFactory@@UAGKXZ) already defined in CMPNT2.OBJ
CMPNT1.OBJ : error LNK2005: "public: virtual long __stdcall CFactory::CreateInstance(struct IUnknown *,struct _GUID const &,void * *)" (?CreateInstance@CFactory@@UAGJPAUIUnknown@@ABU_GUID@@PAPAX@Z) already defined in CMPNT2.OBJ
CMPNT1.OBJ : error LNK2005: "public: virtual long __stdcall CFactory::LockServer(int)" (?LockServer@CFactory@@UAGJH@Z) already defined in CMPNT2.OBJ
CMPNT1.OBJ : error LNK2005: _DllCanUnloadNow@0 already defined in CMPNT2.OBJ
CMPNT1.OBJ : error LNK2005: _DllGetClassObject@12 already defined in CMPNT2.OBJ
CMPNT1.OBJ : error LNK2005: _DllRegisterServer@0 already defined in CMPNT2.OBJ
CMPNT1.OBJ : error LNK2005: _DllUnregisterServer@0 already defined in CMPNT2.OBJ
CMPNT1.OBJ : error LNK2005: _DllMain@12 already defined in CMPNT2.OBJ
CMPNT1.OBJ : warning LNK4006: "public: virtual long __stdcall CFactory::QueryInterface(struct _GUID const &,void * *)" (?QueryInterface@CFactory@@UAGJABU_GUID@@PAPAX@Z) already defined in CMPNT2.OBJ; second definition ignored
CMPNT1.OBJ : warning LNK4006: "public: virtual unsigned long __stdcall CFactory::AddRef(void)" (?AddRef@CFactory@@UAGKXZ) already defined in CMPNT2.OBJ; second definition ignored
CMPNT1.OBJ : warning LNK4006: "public: virtual unsigned long __stdcall CFactory::Release(void)" (?Release@CFactory@@UAGKXZ) already defined in CMPNT2.OBJ; second definition ignored
CMPNT1.OBJ : warning LNK4006: "public: virtual long __stdcall CFactory::CreateInstance(struct IUnknown *,struct _GUID const &,void * *)" (?CreateInstance@CFactory@@UAGJPAUIUnknown@@ABU_GUID@@PAPAX@Z) already defined in CMPNT2.OBJ; second definition
ignored
CMPNT1.OBJ : warning LNK4006: "public: virtual long __stdcall CFactory::LockServer(int)" (?LockServer@CFactory@@UAGJH@Z) already defined in CMPNT2.OBJ; second definition ignored
CMPNT1.OBJ : warning LNK4006: _DllCanUnloadNow@0 already defined in CMPNT2.OBJ; second definition ignored
CMPNT1.OBJ : warning LNK4006: _DllGetClassObject@12 already defined in CMPNT2.OBJ; second definition ignored
CMPNT1.OBJ : warning LNK4006: _DllRegisterServer@0 already defined in CMPNT2.OBJ; second definition ignored
CMPNT1.OBJ : warning LNK4006: _DllUnregisterServer@0 already defined in CMPNT2.OBJ; second definition ignored
CMPNT1.OBJ : warning LNK4006: _DllMain@12 already defined in CMPNT2.OBJ; second definition ignored
Creating library Debug/Client.lib and object Debug/Client.exp
Client.exp : warning LNK4070: /OUT:Cmpnt.dll directive in .EXP differs from output filename "Debug/Client.exe"; ignoring directive
Debug/Client.exe : warning LNK4086: entrypoint "_mainCRTStartup" is not __stdcall with 12 bytes of arguments; image may not run
Debug/Client.exe : fatal error LNK1169: one or more multiply defined symbols found
Error executing link.exe.

Client.exe - 11 error(s), 12 warning(s)

我是刚开始学，不知道为什么会这样。怎样修改才能改变这样的错误。

另外是即使先用一个程序清单8-3或8-4不会出现错误，但运行出来的程序也是一闪而过，不知为何？请教！

[WaistCoat18]

应该是你的代码哪里写的有问题。

[猞猁狲]

你这两个项目里引用了相同的头文件，然后两个项目在又互相引用头文件了！自己好好查查 #include

[biweilun]

头文件冲突估计

[biweilun]

second definition
already defined in

这种我想你自己猜也能猜到问题所在了

[jameshooo]

显然不能把两个例子放到一起编译，两个例子之间是升级的关系，版本2比版本1多加了些功能，所以同一个类名的类定义不同，会产生符号冲突。