day02.txt

消息宏的实现:

======================DECLARE_MESSAGE_MAP===========================================
	private: 
		////用于保存消息ID 和 消息处理函数指针 的对应信息
		static const AFX_MSGMAP_ENTRY _messageEntries[]; 
	protected: 
		//保存了_messageEntries数组地址 和 _GetBaseMessageMap函数地址
		static AFX_DATA const AFX_MSGMAP messageMap; 

		//获取父类的messageMap地址
		static const AFX_MSGMAP* PASCAL _GetBaseMessageMap(); 

		//获取自己的messageMap的地址
		virtual const AFX_MSGMAP* GetMessageMap() const; 
=====================================================================================


	数据结构
		1. AFX_MSGMAP_ENTRY用于保存消息ID 和 消息处理函数指针 的对应信息

		struct AFX_MSGMAP_ENTRY
		{
			UINT nMessage;   // windows message
			UINT nCode;      // control code or WM_NOTIFY code
			UINT nID;        // control ID (or 0 for windows messages)
			UINT nLastID;    // used for entries specifying a range of control id's
			UINT nSig;       // signature type (action) or pointer to message #
			AFX_PMSG pfn;    // routine to call (or special value)
		};

		2. AFX_MSGMAP用于保存GetBaseMap函数的地址 和 AFX_MSGMAP_ENTRY 的地址.
		
		struct AFX_MSGMAP
		{
			const AFX_MSGMAP* (PASCAL* pfnGetBaseMap)();  //函数指针
			const AFX_MSGMAP_ENTRY* lpEntries;     //数组指针
		};


	3.消息映射过程
	
		3.1消息处理函数WindowProc收到消息后, 调用OnWndMsg, 
			如果OnWndMsg不处理消息,那么WindowProc将
			调用DefWindowProc默认处理并返回

		3.2 OnWndMsg处理消息过程:
		   3.2.1 使用GetMessageMap函数获取该窗口类的messageMap的地址
			const AFX_MSGMAP* pMessageMap; pMessageMap = GetMessageMap();
		   3.2.2 在messageMap中的lpEntries数组中查找消息ID对应的数组元素

		   3.2.3 如果未找到, 则获取父类的messageMap的地址,返回3.2.2
		   3.2.4 如果找到, 则获取元素(处理函数地址和父类的messageMap地址)lpEntry
		   3.2.5 根据找到的 lpEntry的nSig表示, 调用消息处理函数



====================   消息映射过程 伪代码=======================================================
	const AFX_MSGMAP* pMessageMap; pMessageMap = GetMessageMap();
	for (; pMessageMap != NULL;pMessageMap = (*pMessageMap->pfnGetBaseMap)()) //往上(父类)查找
	{
		if ((lpEntry = AfxFindMessageEntry(pMessageMap->lpEntries,message, 0, 0)) != NULL)
		{
			pMsgCache->lpEntry = lpEntry;
			AfxUnlockGlobals(CRIT_WINMSGCACHE);
			goto LDispatch;
		}

		int nSig = lpEntry->nSig;

		switch (nSig) //根据处理函数类型, 分支
		{
		case AfxSig_lwl:
			lResult = (this->*mmf.pfn_lwl)(wParam, lParam); //调用处理函数
			break;
		}
	}
=================================================================================================


二  MFC的消息分类

	1.窗口消息, 如:   WM_CREATE   WM_PAINT, 鼠标, 键盘等消息
		这些消息的处理方式是直接调用消息处理函数
		
		ON_MESSAGE()
		ON_WM_XXXX( )


	2.命令消息 WM_COMMAND
		菜单,  工具栏, 按钮 等点击时的命令
		过程: 消息首先发送给主窗口,由主窗口逐层向子窗口派发.
		
		ON_COMMAND()
		ON_COMMAND_RANGE()

	3.通知消息  WM_NOTIFY
		子窗口给父窗口的通知消息
		控件消息宏, 
		例如:   EN_CHANGE(编辑框内容发生改变)   
	
	4.自注册消息
		用户自定义消息处理

		//用户注册消息, 然后在消息映射中使用
		UINT RegisterWindowMessage(LPCTSTR lpString);

		返回注册成功的消息ID (0xC000-0xFFFF)
		消息映射宏  ON_REGISTERED_MESSAGE

		消息处理与窗口消息处理类似, 但是在查找消息处理函数和执行
		消息处理函数时不同


	
		// for Registered Windows messages
		#define ON_REGISTERED_MESSAGE(nMessageVariable, memberFxn) \
		{ 0xC000, 0, 0, 0, (UINT)(UINT*)(&nMessageVariable), \
			/*implied 'AfxSig_lwl'*/ \
			(AFX_PMSG)(AFX_PMSGW)(LRESULT (AFX_MSG_CALL CWnd::*)(WPARAM, LPARAM))&memberFxn },
===========================================================
// MFCMsg.cpp : Defines the entry point for the application.
//

#include "stdafx.h"


class CMsgFrame : public CFrameWnd
{
public:
	virtual LRESULT WindowProc(UINT uMsg, WPARAM wParam, LPARAM lParam);

public:
	DECLARE_MESSAGE_MAP() ;

public:
	afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
	afx_msg void OnTest01();
	afx_msg void OnTest02_04(UINT uID);
	afx_msg void OnEnChange();  //虽然是 走 WM_COMMAND 消息, 但是分为 notify 消息
};

//消息映射 宏实现
BEGIN_MESSAGE_MAP(CMsgFrame, CFrameWnd )
	ON_WM_CREATE()
	ON_COMMAND(1001, OnTest01)
	ON_COMMAND_RANGE(1001, 1004, OnTest02_04)
	ON_EN_CHANGE(1005, OnEnChange)
END_MESSAGE_MAP()



void CMsgFrame::OnEnChange()
{
	CWnd *pWnd =  GetDlgItem(1005);
	CString strText;
	pWnd->GetWindowText(strText);
	AfxMessageBox(strText);


}

int CMsgFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	CreateWindow("BUTTON", "Test01", WS_CHILD|WS_VISIBLE, 50, 50, 200, 30, GetSafeHwnd(), (HMENU)1001, AfxGetApp()->m_hInstance, NULL);

	CreateWindow("BUTTON", "Test02", WS_CHILD|WS_VISIBLE, 50, 100, 200, 30, GetSafeHwnd(), (HMENU)1002, AfxGetApp()->m_hInstance, NULL);

	CreateWindow("BUTTON", "Test03", WS_CHILD|WS_VISIBLE, 50, 150, 200, 30, GetSafeHwnd(), (HMENU)1003, AfxGetApp()->m_hInstance, NULL);

	CreateWindow("BUTTON", "Test04", WS_CHILD|WS_VISIBLE, 50, 200, 200, 30, GetSafeHwnd(), (HMENU)1004, AfxGetApp()->m_hInstance, NULL);

	CreateWindow("EDIT", "",  WS_CHILD|WS_VISIBLE|WS_BORDER,300, 30, 200, 200, GetSafeHwnd(), (HMENU)1005, AfxGetApp()->m_hInstance, NULL);


	return 0;
}

void CMsgFrame::OnTest02_04(UINT uID)
{
	CString strInfo;
	strInfo.Format("%d", uID);
	AfxMessageBox(strInfo);
}

void CMsgFrame::OnTest01()
{
	AfxMessageBox("OnTest01");
}



LRESULT CMsgFrame::WindowProc(UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	//switch ... case


	return CFrameWnd::WindowProc(uMsg, wParam, lParam);
}




class CMsgApp : public CWinApp
{
public:
	virtual BOOL InitInstance();
};

CMsgApp theApp;


BOOL CMsgApp::InitInstance()
{

	CMsgFrame *pWnd = new CMsgFrame();
	pWnd->Create(NULL, "MsgApp");
	this->m_pMainWnd = pWnd;

	this->m_pMainWnd->ShowWindow(SW_SHOW);
	this->m_pMainWnd->UpdateWindow();

	return TRUE;
}



========================================================================















============================================================
// RegisterMsg.cpp : Defines the entry point for the application.
//

#include "stdafx.h"


//注册消息id
UINT g_iRegMsg = RegisterWindowMessage("MYREGMSG");

class CRegisterMsgFrame : public CFrameWnd
{
public:	
	DECLARE_MESSAGE_MAP() ;

public:
	afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
	afx_msg void OnTest();
	afx_msg LRESULT OnRegMsg(WPARAM wParam, LPARAM lParam);
};


BEGIN_MESSAGE_MAP(CRegisterMsgFrame, CFrameWnd)
	ON_WM_CREATE()
	ON_COMMAND(1001, OnTest)
	ON_REGISTERED_MESSAGE(g_iRegMsg, OnRegMsg)
END_MESSAGE_MAP()


void CRegisterMsgFrame::OnTest()
{
	SendMessage(g_iRegMsg);
}


LRESULT CRegisterMsgFrame::OnRegMsg(WPARAM wParam, LPARAM lParam)
{
	AfxMessageBox("Register Msg");
	return 0;
}


int CRegisterMsgFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)
{

	CreateWindow("BUTTON", "Test", WS_CHILD|WS_VISIBLE, 50, 50, 200, 30, GetSafeHwnd(), (HMENU)1001, AfxGetApp()->m_hInstance, NULL);
	//CreateWindow("BUTTON", "Test01", WS_CHILD|WS_VISIBLE, 50, 50, 200, 30, GetSafeHwnd(), (HMENU)1001, AfxGetApp()->m_hInstance, NULL);
	

	return 0;
}

class CRegisterMsgApp : public CWinApp
{
public:
	virtual BOOL InitInstance();
};


CRegisterMsgApp theApp;



BOOL CRegisterMsgApp::InitInstance()
{
	CRegisterMsgFrame *pWnd = new CRegisterMsgFrame();
	pWnd->Create(NULL, "Register Msg");
	m_pMainWnd = pWnd;
	m_pMainWnd->ShowWindow(SW_SHOW);
	m_pMainWnd->UpdateWindow();

	return TRUE;
}

========================================================================
































三  MFC菜单

	1.MFC菜单 是 HMENU的封装


	2.菜单的用法:
		2.1 添加菜单资源
		2.2 创建时, 在窗口中添加菜单
		2.3 菜单项的命令响应  ON_COMMAND


	3. XXXApp中也可以添加消息映射, 
	   因为: 只要继承 CCmdTarget, 都可以处理消息




=======================================================
// MFCMenu.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "resource.h"



class  CMenuApp : public CWinApp
{
	DECLARE_MESSAGE_MAP()
public:
	virtual BOOL InitInstance();
	afx_msg void OnAbout();
};

BEGIN_MESSAGE_MAP(CMenuApp, CWinApp)
	ON_COMMAND(ID_ABOUT, OnAbout)
END_MESSAGE_MAP()



void CMenuApp::OnAbout()
{
	AfxMessageBox("aboout");
}


class CMenuFrame : public CFrameWnd
{
	DECLARE_MESSAGE_MAP()
public:

	afx_msg void OnExit();
};


BEGIN_MESSAGE_MAP(CMenuFrame, CFrameWnd)
	ON_COMMAND(ID_EXIT, OnExit)
END_MESSAGE_MAP()

CMenuApp theApp;


void CMenuFrame::OnExit()
{
	::PostQuitMessage(WM_QUIT);
}

BOOL CMenuApp::InitInstance()
{
	CMenuFrame *pWnd = new CMenuFrame();

	pWnd->Create(NULL, "MenuApp", WS_OVERLAPPEDWINDOW, CFrameWnd::rectDefault, NULL, MAKEINTRESOURCE(IDR_MAIN));
	m_pMainWnd = pWnd;
	m_pMainWnd->ShowWindow(TRUE);
	m_pMainWnd->UpdateWindow();


	return TRUE;
}


=================================================================