MFC DLL 调用

CodeBOOL WINAPI DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID /*lpReserved*/)

{

	if (dwReason == DLL_PROCESS_ATTACH)

	{

		BOOL bResult = FALSE;



#ifdef _AFXDLL

		// wire up resources from core DLL

		AfxCoreInitModule();

#endif



		_AFX_THREAD_STATE* pState = AfxGetThreadState();

		AFX_MODULE_STATE* pPrevModState = pState->m_pPrevModuleState;



		// Initialize DLL's instance(/module) not the app's

		if (!AfxWinInit(hInstance, NULL, _T(""), 0))

		{

			AfxWinTerm();

			goto Cleanup;       // Init Failed

		}



		// initialize the single instance DLL

		CWinApp* pApp; pApp = AfxGetApp();

		//这里可以对 DLL_PROCESS_ATTACH 相应

		if (pApp != NULL && !pApp->InitInstance())

		{

			pApp->ExitInstance();

			AfxWinTerm();

			goto Cleanup;       // Init Failed

		}



		pState->m_pPrevModuleState = pPrevModState;

#ifdef _AFXDLL

		// wire up this DLL into the resource chain

		VERIFY(AfxInitExtensionModule(controlDLL, hInstance));

		CDynLinkLibrary* pDLL; pDLL = new CDynLinkLibrary(controlDLL);

		ASSERT(pDLL != NULL);

#else

		AfxInitLocalData(hInstance);

#endif



		bResult = TRUE;



Cleanup:

		pState->m_pPrevModuleState = pPrevModState;

#ifdef _AFXDLL

		// restore previously-saved module state

		VERIFY(AfxSetModuleState(AfxGetThreadState()->m_pPrevModuleState) ==

			&afxModuleState);

		DEBUG_ONLY(AfxGetThreadState()->m_pPrevModuleState = NULL);

#endif

		return bResult;

	}

	else if (dwReason == DLL_PROCESS_DETACH)

	{

#ifdef _AFXDLL

		// set module state for cleanup

		ASSERT(AfxGetThreadState()->m_pPrevModuleState == NULL);

		AfxGetThreadState()->m_pPrevModuleState =

			AfxSetModuleState(&afxModuleState);

#endif



		CWinApp* pApp = AfxGetApp();

		if (pApp != NULL)

		//这里可以对DLL_PROCESS_DETACH响应

			pApp->ExitInstance();



#ifdef _DEBUG

		// check for missing AfxLockTempMap calls

		if (AfxGetModuleThreadState()->m_nTempMapLock != 0)

		{

			TRACE1("Warning: Temp map lock count non-zero (%ld).\n",

				AfxGetModuleThreadState()->m_nTempMapLock);

		}

#endif

		AfxLockTempMaps();

		AfxUnlockTempMaps(-1);



		// terminate the library before destructors are called

		AfxWinTerm();



#ifdef _AFXDLL

		AfxTermExtensionModule(controlDLL, TRUE);

#else

		AfxTermLocalData(hInstance, TRUE);

#endif

	}

	else

	if (dwReason == DLL_THREAD_DETACH)

	{

		AFX_MANAGE_STATE(&afxModuleState);



#ifdef _DEBUG

		// check for missing AfxLockTempMap calls

		if (AfxGetModuleThreadState()->m_nTempMapLock != 0)

		{

			TRACE1("Warning: Temp map lock count non-zero (%ld).\n",

				AfxGetModuleThreadState()->m_nTempMapLock);

		}

#endif

		AfxLockTempMaps();

		AfxUnlockTempMaps(-1);



		AfxTermThread(hInstance);

	}



	return TRUE;

}

// 看书后 修改一下

DLL_PROCESS_ATTACH   当DLL第一次被加载到进程中的时候 发生这个调用 当再次发生加载的时候 不会发生 

DLL_PROCESS_DETACH   当DLL引用计数为1的时候发生  表示DLL要被卸载出进程了

DLL_THEAD_ATTACH      当新的线程产生的时候会发生这个事件吧

DLL_THEAD_DETACH      当有线程挂掉的时候发生这个事件

所以MFC的DLL 不处理线程的2个事件 是可以的

如果比较邪恶东西 可能会用到这个2个事件吧

DLL加载的核心编程里 说了很多  读懂后 在修改吧