mfc第一天

标签：mfc

一个MFC程序启动机制。

AFX_MODULE_STATE* pModuleState = _AFX_CMDTARGET_GETSTATE(); 	aaa//当前程序模块信息
class AFX_MODULE_STATE : public CNoTrackObject

#ifdef _AFXDLL
#define _AFX_CMDTARGET_GETSTATE() (m_pModuleState)
#else
#define _AFX_CMDTARGET_GETSTATE() (AfxGetModuleState())
#endif


CMyWinApp theApp{
	AFX_MODULE_STATE* pModuleState = _AFX_CMDTARGET_GETSTATE();//获取全局变量模块状态aaa
	AFX_MODULE_THREAD_STATE* pThreadState = pModuleState->m_thread;//获取全局变量线程状态信息bbb
	pThreadState->m_pCurrentWinThread = this;	//将theApp地址赋值给aaa对象
}

CWinThread* AFXAPI AfxGetThread()
{
	// check for current thread in module thread state
	AFX_MODULE_THREAD_STATE* pState = AfxGetModuleThreadState();
	//以Afx开头的都是全局的获取全局变量BBB的地址
	CWinThread* pThread = pState->m_pCurrentWinThread;
	//CMyWinApp-->CWinApp-->CWinThread-->CCmdTarget-->CObject
	//基类指针指向孙子类

	// if no CWinThread for the module, then use the global app
	if (pThread == NULL)
		pThread = AfxGetApp();

	return pThread;
}

_AFXWIN_INLINE CWinApp* AFXAPI AfxGetApp()	//获取全局对象
	{ return afxCurrentWinApp; }
#define afxCurrentWinApp    AfxGetModuleState()->m_pCurrentWinApp
			    pThreadModule->m_pCurrentWinThread=this

MFC第一大机制
MFC程序启动机制

第一个MFC程序
环境配置:
	删除WinMain函数
	将包含的头文件改为<afxwin.h>
	project->Settings中使用MFC库
代码编写
	从CFrameWnd类派生自己的子类CMyFrameWnd
	从CWinApp类派生自己的子类CMtWinApp
	在CMyWinApp类内部重写父类的成员虚函数IninInstance
	全局域中定义一个全局对象CMyWinApp theApp(爆破点)

程序执行过程:
1.mfc封装WinMain所以程序不需要实现
2.构造theApp全局对象,执行CWinApp类的构造函数
	1)将theApp对象地址保存到当前程序模块状态信息中
	2)将theApp对象地址保存到当前程序线程状态信息中
	3)AfxGetThread/AfxGetApp   --返回theApp对象地址
3.进入WinMain函数，其直接调用AfxWinMain函数
	1)AfxWinMain执行过程
		1)获取theApp地址
		2)利用theApp对象地址调用InitApplication虚函数初始化MFC应用程序
		3)利用theApp对象地址调用InitInstance虚函数，创建、显示、刷新 窗口
		4)利用theApp对象设置调用Run虚函数，实现消息循环
		5)程序退出时利用theApp对象地址调用ExiyInstance虚函数,善后处理。
应用程序类(CWinApp)
	成员虚函数
		InitApplication
		InitInstance
		OnIdel
		Run
		ExitInstance
	成员变量
		m_pMainWnd
		theApp
		     --->m_pMainWnd
MFC类库中没有对象，只有类
**********************************************************************
WinMain(...){
	AfxWinMain(....){
		CWinThread* pThread = AfxGetThread();		////theApp地址
		CWinApp* pApp = AfxGetApp();			////theApp地址
		//以上两句获取theApp对象地址
		AfxWinInit(hInstance, hPrevInstance, lpCmdLine, nCmdShow)	
		//初始化MFC库
		pApp->InitApplication()			//theApp-->虚函数
		//重写后执行流程会改变，执行自己的函数
		//实为CWinApp的

		pThread->InitInstance()		//回到自己写的代码  重写改变执行流程
		//this指针为theApp对象地址.pThread值为theApp
		//InitInstance由pThread调用
		nReturnCode = pThread->Run();{	//this==pThread==theApp还是theApp
			CWinThread::Run();{	//函数内部this指针为theApp地址
				while(没有消息){
					空闲处理
					ths->OnIdel();	//空闲处理
				}
				PumpMessage(){	pump  打气筒，抽取
					if(GetMessage抓到WM_QUIT){
						return FALSE;
					}
				}
				if(PumpMessage返回FALSE){
					ExitInstance();//应用程序类的虚函数，善后处理
				}
			}
		}
	}
}

一直由theApp对象指针调用虚函数
***************************************************************************

CMyWinApp theApp;
BOOL CMyWinApp::InitInstance(){				//this======theApp
	CMyFrameWnd *pFrame=new CMyFrameWnd();		//框架类对象
	pFrame->Create(NULL,"MyFrame");			//创建+注册
	m_pMainWnd=pFrame;				//this->m_pMainWnd保存框架类对象地址
	pFrame->ShowWindow(SW_SHOW);			//目测为CWinApp类的成员
	pFrame->UpdateWindow();				//成员函数由theApp调用
	return TRUE;
}

int CWinApp::Run()
{
	if (m_pMainWnd == NULL && AfxOleGetUserCtrl())
	{
		// Not launched /Embedding or /Automation, but has no main window!
		TRACE0("Warning: m_pMainWnd is NULL in CWinApp::Run - quitting application.\n");
		AfxPostQuitMessage(0);		//退出程序
	}
	return CWinThread::Run();   this->CWinAppThread::Run();
}


BOOL CWinThread::PumpMessage()
{
	ASSERT_VALID(this);

	if (!::GetMessage(&m_msgCur, NULL, NULL, NULL))
	{
#ifdef _DEBUG
		if (afxTraceFlags & traceAppMsg)
			TRACE0("CWinThread::PumpMessage - Received WM_QUIT.\n");
		m_nDisablePumpCount++; // application must die
			// Note: prevents calling message loop things in 'ExitInstance'
			// will never be decremented
#endif
		return FALSE;
	}
#ifdef _DEBUG
	if (m_nDisablePumpCount != 0)
	{
		TRACE0("Error: CWinThread::PumpMessage called when not permitted.\n");
		ASSERT(FALSE);
	}
#endif

#ifdef _DEBUG
	if (afxTraceFlags & traceAppMsg)
		_AfxTraceMsg(_T("PumpMessage"), &m_msgCur);
#endif

	// process this message

	if (m_msgCur.message != WM_KICKIDLE && !PreTranslateMessage(&m_msgCur))
	{
		::TranslateMessage(&m_msgCur);
		::DispatchMessage(&m_msgCur);
	}
	return TRUE;
}


int CWinThread::Run()
{
	ASSERT_VALID(this);

	// for tracking the idle time state
	BOOL bIdle = TRUE;
	LONG lIdleCount = 0;

	// acquire and dispatch messages until a WM_QUIT message is received.
	for (;;)
	{
		// phase1: check to see if we can do idle work
		while (bIdle &&
			!::PeekMessage(&m_msgCur, NULL, NULL, NULL, PM_NOREMOVE))	//没消息时
			//进入while循环
			//::表示win32函数
		{
			// call OnIdle while in bIdle state
			if (!OnIdle(lIdleCount++))
			//this->OnIdel(空闲次数)	OnIdel()前没有::,是成员函数
				bIdle = FALSE; // assume "no idle" state
		}

		// phase2: pump messages while available
		do
		{
			// pump message, but quit on WM_QUIT
			if (!PumpMessage())
				return ExitInstance();	//this->ExitInstance()   theApp
				//应用程序类的成员虚函数
				//点击关闭按钮出发的事件

			// reset "no idle" state after pumping "normal" message
			if (IsIdleMessage(&m_msgCur))
			{
				bIdle = TRUE;
				lIdleCount = 0;
			}

		} while (::PeekMessage(&m_msgCur, NULL, NULL, NULL, PM_NOREMOVE));
	}

	ASSERT(FALSE);  // not reachable
}



int AFXAPI AfxWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
	LPTSTR lpCmdLine, int nCmdShow)
{
	ASSERT(hPrevInstance == NULL);

	int nReturnCode = -1;
	CWinThread* pThread = AfxGetThread();		////theApp地址
	CWinApp* pApp = AfxGetApp();			////theApp地址

	// AFX internal initialization
	if (!AfxWinInit(hInstance, hPrevInstance, lpCmdLine, nCmdShow))		//初始化MFC库
		goto InitFailure;

	// App global initializations (rare)
	if (pApp != NULL && !pApp->InitApplication())
		goto InitFailure;

	// Perform specific initializations
	if (!pThread->InitInstance())
	{
		if (pThread->m_pMainWnd != NULL)
		{
			TRACE0("Warning: Destroying non-NULL m_pMainWnd\n");
			pThread->m_pMainWnd->DestroyWindow();
		}
		nReturnCode = pThread->ExitInstance();
		goto InitFailure;
	}
	nReturnCode = pThread->Run();

InitFailure:
#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);
	}
	AfxLockTempMaps();
	AfxUnlockTempMaps(-1);
#endif

	AfxWinTerm();
	return nReturnCode;
}

mfc第一天

标签：mfc

原文地址：http://blog.csdn.net/u011185633/article/details/44775705