MFC学习笔记四——动态创建 Dynamic Creation

动态创建 Dynamic Creation

//-------------------------------------------------------------------// MFC.H//-------------------------------------------------------------------#define BOOL int#define TRUE 1#define FALSE 0#define LPCSTR LPSTRtypedef char* LPSTR;#define UINT int#define PASCAL _stdcall#define TRACE1 printf#include <iostream>#include <stdio.h>#include <string>using namespace std;class CObject;struct CRuntimeClass{LPCSTR m_lpszClassName;int m_nObjectSize;UINT m_wSchema;CObject* (PASCAL* m_pfnCreateObject)();CRuntimeClass* m_pBaseClass;CObject* CreateObject();static CRuntimeClass* PASCAL Load();static CRuntimeClass* pFirstClass;CRuntimeClass* m_pNextClass;};struct AFX_CLASSINIT{AFX_CLASSINIT(CRuntimeClass* pNewClass);};#define RUNTIME_CLASS(class_name) /(&class_name::class##class_name)#define DECLARE_DYNAMIC(class_name) /public: /static CRuntimeClass class##class_name; /virtual CRuntimeClass* GetRuntimeClass() const;#define DECLARE_DYNCREATE(class_name) /DECLARE_DYNAMIC(class_name) /static CObject* PASCAL CreateObject();#define _IMPLEMENT_RUNTIMECLASS(class_name,base_class_name,wSchema,pfnNew) /static char _lpsz##class_name[] = #class_name; /CRuntimeClass class_name::class##class_name = { /_lpsz##class_name, sizeof(class_name), wSchema, pfnNew, /RUNTIME_CLASS(base_class_name), NULL}; /static AFX_CLASSINIT _init_##class_name(&class_name::class##class_name); /CRuntimeClass* class_name::GetRuntimeClass() const /{ return &class_name::class##class_name; } /#define IMPLEMENT_DYNMIC(class_name, base_class_name) /_IMPLEMENT_RUNTIMECLASS(class_name, base_class_name, 65535, NULL)#define IMPLEMENT_DYNCREATE(class_name, base_class_name) /CObject* PASCAL class_name::CreateObject() /{ return new class_name; } /_IMPLEMENT_RUNTIMECLASS(class_name,base_class_name,65535, class_name::CreateObject)class CObject{public:CObject::CObject() { }CObject::~CObject() { }virtual CRuntimeClass* GetRuntimeClass() const;BOOL IsKindOf(const CRuntimeClass* pClass) const;public:static CRuntimeClass classCObject;virtual void SayHello() { cout << "这里是CObject类 /n"; }};class CCmdTarget : public CObject{DECLARE_DYNAMIC(CCmdTarget)public:CCmdTarget::CCmdTarget() { }CCmdTarget::~CCmdTarget() { }};class CWinThread : public CCmdTarget{DECLARE_DYNAMIC(CWinThread)public:CWinThread::CWinThread() { }CWinThread::~CWinThread() { }virtual BOOL InitInstance() { return TRUE; }virtual int Run() { return 1; }};class CWnd;class CWinApp : public CWinThread{DECLARE_DYNAMIC(CWinApp)public:CWinApp* m_pCurrentWinApp;CWnd* m_pMainWnd;public:CWinApp::CWinApp() { m_pCurrentWinApp = this; }CWinApp::~CWinApp() { }virtual BOOL InitApplication() { return TRUE; }virtual BOOL InitInstance() { return TRUE; }virtual int Run() { return CWinThread::Run(); }};class CDocument : public CCmdTarget{DECLARE_DYNAMIC(CDocument)public:CDocument::CDocument() { }CDocument::~CDocument() { }};class CWnd : public CCmdTarget{DECLARE_DYNCREATE(CWnd)public:CWnd::CWnd() { cout << "CWnd Constructor /n"; }CWnd::~CWnd() { }virtual BOOL Create();BOOL CreateEx();virtual BOOL PreCreateWindow();void SayHello() { cout << "这里是CWnd类 /n"; }};class CFrameWnd : public CWnd{DECLARE_DYNCREATE(CFrameWnd)public:CFrameWnd::CFrameWnd() { cout << "CFrameWnd Constructor /n"; }CFrameWnd::~CFrameWnd() { }virtual BOOL Create();//BOOL CreateEx();virtual BOOL PreCreateWindow();void SayHello() { cout << "这里是CFrameWnd类 /n"; }};class CView : public CWnd{DECLARE_DYNAMIC(CView)public:CView::CView() { }CView::~CView() { }};//GLOBAL FUNCCWinApp* AfxGetApp();//-------------------------------------------------------------------// MFC.CPP//-------------------------------------------------------------------#include "my.h"extern CMyWinApp theApp;static char szCObject[] = "CObject";struct CRuntimeClass CObject::classCObject = { szCObject, sizeof(CObject),65535,NULL, NULL, NULL};static AFX_CLASSINIT _init_CObject(&CObject::classCObject);CRuntimeClass* CRuntimeClass::pFirstClass = NULL;AFX_CLASSINIT::AFX_CLASSINIT(CRuntimeClass* pNewClass){pNewClass->m_pNextClass = CRuntimeClass::pFirstClass;CRuntimeClass::pFirstClass = pNewClass;}CObject* CRuntimeClass::CreateObject(){if (m_pfnCreateObject == NULL){TRACE1("错误：试图创建的对象不存在：%hs./n",m_lpszClassName);return NULL;}CObject* pObject = NULL;pObject = (*m_pfnCreateObject)();return pObject;}CRuntimeClass* PASCAL CRuntimeClass::Load(){char szClassName[64];CRuntimeClass* pClass;cout << " 输入一个类名" ;cin >> szClassName;for(pClass = pFirstClass;pClass!=NULL;pClass=pClass->m_pNextClass){if (strcmp(szClassName, pClass->m_lpszClassName)==0)return pClass;}TRACE1("错误：没有找到匹配的类：%s /n",szClassName);return NULL;}CRuntimeClass* CObject::GetRuntimeClass()const{return &CObject::classCObject;}BOOL CObject::IsKindOf(const CRuntimeClass* pClass) const{CRuntimeClass* pClassThis = GetRuntimeClass();while (pClassThis!=NULL){if (pClassThis==pClass){return TRUE;}pClassThis = pClassThis->m_pBaseClass;}return FALSE;}BOOL CWnd::Create(){return TRUE;}BOOL CWnd::CreateEx(){PreCreateWindow();return TRUE;}BOOL CWnd::PreCreateWindow(){return TRUE;}BOOL CFrameWnd::Create(){CreateEx();return TRUE;}BOOL CFrameWnd::PreCreateWindow(){return TRUE;}CWinApp* AfxGetApp(){return theApp.m_pCurrentWinApp;}IMPLEMENT_DYNMIC(CCmdTarget, CObject)IMPLEMENT_DYNMIC(CWinThread, CCmdTarget)IMPLEMENT_DYNMIC(CWinApp, CWinThread)IMPLEMENT_DYNMIC(CDocument, CCmdTarget)IMPLEMENT_DYNCREATE(CWnd, CCmdTarget)IMPLEMENT_DYNMIC(CView, CWnd)IMPLEMENT_DYNCREATE(CFrameWnd, CWnd)//-------------------------------------------------------------------// MY.H//-------------------------------------------------------------------#include <iostream>#include "MFC.h"class CMyWinApp : public CWinApp{public:CMyWinApp::CMyWinApp() { }CMyWinApp::~CMyWinApp() { }virtual BOOL InitInstance();};class CMyFrameWnd : public CFrameWnd{DECLARE_DYNCREATE(CMyFrameWnd)public:CMyFrameWnd::CMyFrameWnd();CMyFrameWnd::~CMyFrameWnd() { }void sayHello() { cout << "这里是CMyFrameWnd类 /n"; }};class CMyDoc : public CDocument{DECLARE_DYNCREATE(CMyDoc)public:CMyDoc::CMyDoc() { cout << "CMyDoc constructor /n";}CMyDoc::~CMyDoc() { }void sayHello() { cout << "这里是CMyDoc类 /n"; }};class CMyView : public CView{DECLARE_DYNCREATE(CMyView)public:CMyView::CMyView() { cout << "CMyView constructor /n"; }CMyView::~CMyView() { }void sayHello() { cout << "这里是CMyView类 /n"; }};//global functionvoid AfxprintAllClasses();//-------------------------------------------------------------------// MY.CPP//-------------------------------------------------------------------#include "MY.h"CMyWinApp theApp;BOOL CMyWinApp::InitInstance(){m_pMainWnd = new CMyFrameWnd;return TRUE;}CMyFrameWnd::CMyFrameWnd(){cout << "CMyDoc constructor /n"; Create();}IMPLEMENT_DYNCREATE(CMyFrameWnd,CFrameWnd)IMPLEMENT_DYNCREATE(CMyDoc,CDocument)IMPLEMENT_DYNCREATE(CMyView,CView)void PrintAllClasses(){CRuntimeClass* pClass;for (pClass = CRuntimeClass::pFirstClass; pClass!=NULL; pClass = pClass->m_pNextClass){cout<<pClass->m_lpszClassName<<endl;cout<<pClass->m_nObjectSize<<endl;cout<<pClass->m_wSchema<<endl;}}//-------------------------------------------------------------------// main//-------------------------------------------------------------------void main(){CWinApp* pApp = AfxGetApp();pApp->InitApplication();pApp->InitInstance();pApp->Run();CRuntimeClass* pClassRef;CObject* pOb;while (1){if ((pClassRef = CRuntimeClass::Load())== NULL){break;}pOb = pClassRef->CreateObject();if (pOb!=NULL){pOb->SayHello();}}} 

 

 

 

CWnd Constructor

CFrameWnd Constructor

CMyDoc constructor

 输入一个类名CObject

错误：试图创建的对象不存在：CObject.

 输入一个类名CView

错误：试图创建的对象不存在：CView.

 输入一个类名CMyView

CWnd Constructor

CMyView constructor

这里是CWnd类

 输入一个类名CMyFrameWnd

CWnd Constructor

CFrameWnd Constructor

CMyDoc constructor

这里是CFrameWnd类

 输入一个类名CMyDoc

CMyDoc constructor

这里是CObject类

 输入一个类名CWinApp

错误：试图创建的对象不存在：CWinApp.

 输入一个类名CChain

错误：没有找到匹配的类：CChain

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