MFC DLL 调用

BOOL 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