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）