手写MFC----第四讲 BEGIN_MESSAGE_MAP

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首先看定义

#define BEGIN_MESSAGE_MAP(theClass, baseClass) /

const AFX_MSGMAP* theClass::GetMessageMap() const /

{ return &theClass::messageMap; } /

AFX_COMDAT AFX_DATADEF const AFX_MSGMAP theClass::messageMap = /

{ &baseClass::messageMap, &theClass::_messageEntries[0] }; /

AFX_COMDAT const AFX_MSGMAP_ENTRY theClass::_messageEntries[] = /

{ /

实际应用BEGIN_MESSAGE_MAP(myview,CView)等价于

const AFX_MSGMAP* myview::GetMessageMap() const /

{ return & myview::messageMap; } /

AFX_COMDAT AFX_DATADEF const AFX_MSGMAP myview::messageMap = /

{ & CView::messageMap, & myview::_messageEntries[0] }; /

AFX_COMDAT const AFX_MSGMAP_ENTRY myview::_messageEntries[] = /

{ /

还有END_MESSAGE_MAP和BEGIN_MESSAGE_MAP是成对出现的

#define END_MESSAGE_MAP() /

{0, 0, 0, 0, AfxSig_end, (AFX_PMSG)0 } /

}; /

整个程序改成如下：

#include <afxwin.h>

#include <afxext.h>

#include "resource.h"

class mydoc:public CDocument

{

public:

static const CRuntimeClass classmydoc;

virtual CRuntimeClass* GetRuntimeClass() const;

static CObject* __stdcall CreateObject();

public :

CString s;

CPoint point;

mydoc()

{

s="Welcome to SDI";

point.x=250;

point.y=100;

}

};

CObject* __stdcall mydoc::CreateObject()

{ return new mydoc; }

const CRuntimeClass mydoc::classmydoc =

{

"mydoc", sizeof(class mydoc), 0xFFFF, mydoc::CreateObject,

(CRuntimeClass*)(& CDocument::classCDocument), NULL };

CRuntimeClass* mydoc::GetRuntimeClass() const

{ return ((CRuntimeClass*)(& mydoc::classmydoc)); }

class myview:public CView

{

public:

static const CRuntimeClass classmyview;

virtual CRuntimeClass* GetRuntimeClass() const;

static CObject* __stdcall CreateObject();

public:

void OnDraw(CDC *d)

{

mydoc *b;

b=(mydoc *)m_pDocument;

d->SetTextColor(RGB(0,0,0)) ;

d->TextOut(b->point.x,b->point.y ,b->s) ;

}

void OnLButtonDown(UINT nFlags,CPoint p)

{

mydoc *b;

b=(mydoc*)m_pDocument;

b->point.x=p.x;

b->point.y=p.y;

Invalidate();

}

private:

static const AFX_MSGMAP_ENTRY _messageEntries[];

protected:

static AFX_DATA const AFX_MSGMAP messageMap;

virtual const AFX_MSGMAP* GetMessageMap() const;

};

CObject* __stdcall myview::CreateObject()

{ return new myview; }

const CRuntimeClass myview::classmyview =

{

"myview", sizeof(class myview), 0xFFFF, myview::CreateObject,

(CRuntimeClass*)(& CView::classCView), NULL

};

CRuntimeClass* myview::GetRuntimeClass() const

{

return ((CRuntimeClass*)(& myview::classmyview));

}

const AFX_MSGMAP* myview::GetMessageMap() const

{ return & myview::messageMap; }

const AFX_MSGMAP myview::messageMap =

{ & CView::messageMap, & myview::_messageEntries[0] };

const AFX_MSGMAP_ENTRY myview::_messageEntries[] =

{

WM_LBUTTONDOWN, 0, 0, 0, AfxSig_vwp,

(AFX_PMSG)(AFX_PMSGW)(void (CWnd::*)(UINT, CPoint))&OnLButtonDown

{0, 0, 0, 0, AfxSig_end, (AFX_PMSG)0 }

};

class zzz:public CWinApp

{

public:

int InitInstance()

{

CSingleDocTemplate *y;

CRuntimeClass *w,*d,*v;

d=(CRuntimeClass*)(&mydoc::classmydoc);

w=(CRuntimeClass*)(&CFrameWnd::classCFrameWnd);

v=(CRuntimeClass*)(&myview::classmyview);

y=new CSingleDocTemplate(IDR_MENU1,d,w,v);

AddDocTemplate(y);

OnFileNew();

return 1;

}

};

zzz a;

（全文完）