MFC视图结构框架分析教学资料

1、Good is good, but better carries it.精益求精，善益求善。MFC视图结构框架分析MFC文档视图结构框架分析1:程序的“导火索”theAppCmyApptheApp;在声明对象的同时，调用其构造函数。按C+的语法，首先要调用其基类Cwinapp的构造函数.这个文件主要用于应用程序的一些初始化操作。classCWinApp:publicCWinThreadDECLARE_DYNAMIC(CWinApp)public:/ConstructorCWinApp(LPCTSTRlpszAppName=NULL);CWinApp:CWinApp(LPCTSTRlpszApp

2、Name)if(lpszAppName!=NULL)m_pszAppName=_tcsdup(lpszAppName);elsem_pszAppName=NULL;/initializeCWinThreadstateAFX_MODULE_STATE*pModuleState=_AFX_CMDTARGET_GETSTATE();AFX_MODULE_THREAD_STATE*pThreadState=pModuleState-m_thread;ASSERT(AfxGetThread()=NULL);pThreadState-m_pCurrentWinThread=this;ASSERT(AfxG

3、etThread()=this);m_hThread=:GetCurrentThread();m_nThreadID=:GetCurrentThreadId();/initializeCWinAppstateASSERT(afxCurrentWinApp=NULL);/onlyoneCWinAppobjectpleasepModuleState-m_pCurrentWinApp=this;ASSERT(AfxGetApp()=this);/innon-runningstateuntilWinMainm_hInstance=NULL;m_hLangResourceDLL=NULL;m_pszHe

4、lpFilePath=NULL;m_pszProfileName=NULL;m_pszRegistryKey=NULL;m_pszExeName=NULL;m_pRecentFileList=NULL;m_pDocManager=NULL;m_atomApp=m_atomSystemTopic=NULL;m_lpCmdLine=NULL;m_pCmdInfo=NULL;/initializewaitcursorstatem_nWaitCursorCount=0;m_hcurWaitCursorRestore=NULL;/initializecurrentprinterstatem_hDevMo

5、de=NULL;m_hDevNames=NULL;m_nNumPreviewPages=0;/notspecified(defaultsto1)/initializeDAOstatem_lpfnDaoTerm=NULL;/willbesetifAfxDaoInitcalled/otherinitializationm_bHelpMode=FALSE;m_eHelpType=afxWinHelp;m_nSafetyPoolSize=512;/defaultsize2:theApp之后的隐藏代码，由他控制整个程序的流程。_tWinMain(HINSTANCEhInstance,HINSTANCEh

6、PrevInstance,LPTSTRlpCmdLine,intnCmdShow)/callshared/exportedWinMainreturnAfxWinMain(hInstance,hPrevInstance,lpCmdLine,nCmdShow);其中有宏定义：#define_tWinMainwWinMainintAFXAPIAfxWinMain(HINSTANCEhInstance,HINSTANCEhPrevInstance,LPTSTRlpCmdLine,intnCmdShow)ASSERT(hPrevInstance=NULL);intnReturnCode=-1;CWinT

7、hread*pThread=AfxGetThread();；/CWinApp是从CWinThread派生的，CWinApp*pApp=AfxGetApp();/实质上就是pThread=pApp/AFXinternalinitializationif(!AfxWinInit(hInstance,hPrevInstance,lpCmdLine,nCmdShow)/用于初始化gotoInitFailure;/Appglobalinitializations(rare)if(pApp!=NULL&!pApp-InitApplication()/用于初始化gotoInitFailure;/Perfor

8、mspecificinitializationsif(!pThread-InitInstance()/注意多态性virtualBOOLInitInstance();/又因为pThread=pApp，所以调用pApp-InitInstance()if(pThread-m_pMainWnd!=NULL)TRACE(traceAppMsg,0,Warning:Destroyingnon-NULLm_pMainWndn);pThread-m_pMainWnd-DestroyWindow();nReturnCode=pThread-ExitInstance();gotoInitFailure;nRetu

9、rnCode=pThread-Run();/控制消息循环InitFailure:#ifdef_DEBUG/CheckformissingAfxLockTempMapcallsif(AfxGetModuleThreadState()-m_nTempMapLock!=0)TRACE(traceAppMsg,0,Warning:Tempmaplockcountnon-zero(%ld).n,AfxGetModuleThreadState()-m_nTempMapLock);AfxLockTempMaps();AfxUnlockTempMaps(-1);#endifAfxWinTerm();retur

10、nnReturnCode;由上面的程序可以看到几个很重要的函数（1）AfxWinInit(hInstance,hPrevInstance,lpCmdLine,nCmdShow)gotoInitFailure;(2)pApp-InitApplication()(3)pThread-InitInstance()(4)pThread-Run()其中1，2也是完成程序的一些初始化工作，4主要是为了处理消息，3呢，很关键，我们运行时看到的窗口就是从这里产生。下面一一介绍3:程序自动产生的InitInstance()函数以下是自动生成的InitInstance()源程序：BOOLCmyApp:InitIn

11、stance()/如果一个运行在WindowsXP上的应用程序清单指定要/使用ComCtl32.dll版本6或更高版本来启用可视化方式，/则需要InitCommonControls()。否则，将无法创建窗口。InitCommonControls();CWinApp:InitInstance();/初始化OLE库if(!AfxOleInit()AfxMessageBox(IDP_OLE_INIT_FAILED);returnFALSE;AfxEnableControlContainer();/标准初始化/如果未使用这些功能并希望减小/最终可执行文件的大小，则应移除下列/不需要的特定初始化例程/更

12、改用于存储设置的注册表项/TODO:应适当修改该字符串，/例如修改为公司或组织名SetRegistryKey(_T(应用程序向导生成的本地应用程序);LoadStdProfileSettings(4);/加载标准INI文件选项(包括MRU)/注册应用程序的文档模板。文档模板/将用作文档、框架窗口和视图之间的连接CMultiDocTemplate*pDocTemplate;pDocTemplate=newCMultiDocTemplate(IDR_myTYPE,RUNTIME_CLASS(CmyDoc),RUNTIME_CLASS(CChildFrame),/自定义MDI子框架RUNTIME_C

13、LASS(CmyView);if(!pDocTemplate)returnFALSE;AddDocTemplate(pDocTemplate);/创建主MDI框架窗口CMainFrame*pMainFrame=newCMainFrame;if(!pMainFrame|!pMainFrame-LoadFrame(IDR_MAINFRAME)returnFALSE;m_pMainWnd=pMainFrame;/仅当具有后缀时才调用DragAcceptFiles/在MDI应用程序中，这应在设置m_pMainWnd之后立即发生/分析标准外壳命令、DDE、打开文件操作的命令行CCommandLineIn

14、focmdInfo;ParseCommandLine(cmdInfo);/调度在命令行中指定的命令。如果/用/RegServer、/Register、/Unregserver或/Unregister启动应用程序，则返回FALSE。if(!ProcessShellCommand(cmdInfo)/引发窗口注册returnFALSE;/主窗口已初始化，因此显示它并对其进行更新pMainFrame-ShowWindow(m_nCmdShow);pMainFrame-UpdateWindow();returnTRUE;其中，注册窗口用到了一下函数，比较长，如下：BOOLAFXAPIAfxEndDefe

15、rRegisterClass(LONGfToRegister)/maskoffallclassesthatarealreadyregisteredAFX_MODULE_STATE*pModuleState=AfxGetModuleState();fToRegister&=pModuleState-m_fRegisteredClasses;if(fToRegister=0)returnTRUE;LONGfRegisteredClasses=0;/commoninitializationWNDCLASSwndcls;memset(&wndcls,0,sizeof(WNDCLASS);/startw

16、ithNULLdefaultswndcls.lpfnWndProc=DefWindowProc;/窗口处理函数wndcls.hInstance=AfxGetInstanceHandle();wndcls.hCursor=afxData.hcurArrow;INITCOMMONCONTROLSEXinit;init.dwSize=sizeof(init);/worktoregisterclassesasspecifiedbyfToRegister,populatefRegisteredClassesaswegoif(fToRegister&AFX_WND_REG)/Childwindows-no

17、brush,noicon,safestdefaultclassstyleswndcls.style=CS_DBLCLKS|CS_HREDRAW|CS_VREDRAW;wndcls.lpszClassName=_afxWnd;if(AfxRegisterClass(&wndcls)fRegisteredClasses|=AFX_WND_REG;if(fToRegister&AFX_WNDOLECONTROL_REG)/OLEControlwindows-useparentDCforspeedwndcls.style|=CS_PARENTDC|CS_DBLCLKS|CS_HREDRAW|CS_VR

18、EDRAW;wndcls.lpszClassName=_afxWndOleControl;if(AfxRegisterClass(&wndcls)fRegisteredClasses|=AFX_WNDOLECONTROL_REG;if(fToRegister&AFX_WNDCONTROLBAR_REG)/Controlbarwindowswndcls.style=0;/controlbarsdonthandledoubleclickwndcls.lpszClassName=_afxWndControlBar;wndcls.hbrBackground=(HBRUSH)(COLOR_BTNFACE

19、+1);if(AfxRegisterClass(&wndcls)fRegisteredClasses|=AFX_WNDCONTROLBAR_REG;if(fToRegister&AFX_WNDMDIFRAME_REG)/MDIFramewindow(alsousedforsplitterwindow)wndcls.style=CS_DBLCLKS;wndcls.hbrBackground=NULL;if(_AfxRegisterWithIcon(&wndcls,_afxWndMDIFrame,AFX_IDI_STD_MDIFRAME)fRegisteredClasses|=AFX_WNDMDI

20、FRAME_REG;if(fToRegister&AFX_WNDFRAMEORVIEW_REG)/SDIFrameorMDIChildwindowsorviews-normalcolorswndcls.style=CS_DBLCLKS|CS_HREDRAW|CS_VREDRAW;wndcls.hbrBackground=(HBRUSH)(COLOR_WINDOW+1);if(_AfxRegisterWithIcon(&wndcls,_afxWndFrameOrView,AFX_IDI_STD_FRAME)fRegisteredClasses|=AFX_WNDFRAMEORVIEW_REG;if

21、(fToRegister&AFX_WNDCOMMCTLS_REG)/thisflagiscompatiblewiththeoldInitCommonControls()APIinit.dwICC=ICC_WIN95_CLASSES;fRegisteredClasses|=_AfxInitCommonControls(&init,AFX_WIN95CTLS_MASK);fToRegister&=AFX_WIN95CTLS_MASK;if(fToRegister&AFX_WNDCOMMCTL_UPDOWN_REG)init.dwICC=ICC_UPDOWN_CLASS;fRegisteredCla

22、sses|=_AfxInitCommonControls(&init,AFX_WNDCOMMCTL_UPDOWN_REG);if(fToRegister&AFX_WNDCOMMCTL_TREEVIEW_REG)init.dwICC=ICC_TREEVIEW_CLASSES;fRegisteredClasses|=_AfxInitCommonControls(&init,AFX_WNDCOMMCTL_TREEVIEW_REG);if(fToRegister&AFX_WNDCOMMCTL_TAB_REG)init.dwICC=ICC_TAB_CLASSES;fRegisteredClasses|=

23、_AfxInitCommonControls(&init,AFX_WNDCOMMCTL_TAB_REG);if(fToRegister&AFX_WNDCOMMCTL_PROGRESS_REG)init.dwICC=ICC_PROGRESS_CLASS;fRegisteredClasses|=_AfxInitCommonControls(&init,AFX_WNDCOMMCTL_PROGRESS_REG);if(fToRegister&AFX_WNDCOMMCTL_LISTVIEW_REG)init.dwICC=ICC_LISTVIEW_CLASSES;fRegisteredClasses|=_

24、AfxInitCommonControls(&init,AFX_WNDCOMMCTL_LISTVIEW_REG);if(fToRegister&AFX_WNDCOMMCTL_HOTKEY_REG)init.dwICC=ICC_HOTKEY_CLASS;fRegisteredClasses|=_AfxInitCommonControls(&init,AFX_WNDCOMMCTL_HOTKEY_REG);if(fToRegister&AFX_WNDCOMMCTL_BAR_REG)init.dwICC=ICC_BAR_CLASSES;fRegisteredClasses|=_AfxInitCommo

25、nControls(&init,AFX_WNDCOMMCTL_BAR_REG);if(fToRegister&AFX_WNDCOMMCTL_ANIMATE_REG)init.dwICC=ICC_ANIMATE_CLASS;fRegisteredClasses|=_AfxInitCommonControls(&init,AFX_WNDCOMMCTL_ANIMATE_REG);if(fToRegister&AFX_WNDCOMMCTL_INTERNET_REG)init.dwICC=ICC_INTERNET_CLASSES;fRegisteredClasses|=_AfxInitCommonCon

26、trols(&init,AFX_WNDCOMMCTL_INTERNET_REG);if(fToRegister&AFX_WNDCOMMCTL_COOL_REG)init.dwICC=ICC_COOL_CLASSES;fRegisteredClasses|=_AfxInitCommonControls(&init,AFX_WNDCOMMCTL_COOL_REG);if(fToRegister&AFX_WNDCOMMCTL_USEREX_REG)init.dwICC=ICC_USEREX_CLASSES;fRegisteredClasses|=_AfxInitCommonControls(&ini

27、t,AFX_WNDCOMMCTL_USEREX_REG);if(fToRegister&AFX_WNDCOMMCTL_DATE_REG)init.dwICC=ICC_DATE_CLASSES;fRegisteredClasses|=_AfxInitCommonControls(&init,AFX_WNDCOMMCTL_DATE_REG);if(fToRegister&AFX_WNDCOMMCTL_LINK_REG)init.dwICC=ICC_LINK_CLASS;fRegisteredClasses|=_AfxInitCommonControls(&init,AFX_WNDCOMMCTL_L

28、INK_REG);/savenewstateofregisteredcontrolspModuleState-m_fRegisteredClasses|=fRegisteredClasses;/specialcaseforallcommoncontrolsregistered,turnonAFX_WNDCOMMCTLS_REGif(pModuleState-m_fRegisteredClasses&AFX_WIN95CTLS_MASK)=AFX_WIN95CTLS_MASK)pModuleState-m_fRegisteredClasses|=AFX_WNDCOMMCTLS_REG;fRegi

29、steredClasses|=AFX_WNDCOMMCTLS_REG;/musthaveregisteredatleastasmamyclassesasrequestedreturn(fToRegister&fRegisteredClasses)=fToRegister;他是在PreCreateWindow中调用的注册，BOOLCFrameWnd:PreCreateWindow(CREATESTRUCT&cs)if(cs.lpszClass=NULL)VERIFY(AfxDeferRegisterClass(AFX_WNDFRAMEORVIEW_REG);cs.lpszClass=_afxWn

30、dFrameOrView;/COLOR_WINDOWbackgroundif(cs.style&FWS_ADDTOTITLE)cs.style|=FWS_PREFIXTITLE;cs.dwExStyle|=WS_EX_CLIENTEDGE;returnTRUE;BOOLCMainFrame:PreCreateWindow(CREATESTRUCT&cs)if(!CFrameWnd:PreCreateWindow(cs)returnFALSE;/TODO:ModifytheWindowclassorstylesherebymodifying/theCREATESTRUCTcsreturnTRUE

31、;BOOLCView:PreCreateWindow(CREATESTRUCT&cs)ASSERT(cs.style&WS_CHILD);if(cs.lpszClass=NULL)VERIFY(AfxDeferRegisterClass(AFX_WNDFRAMEORVIEW_REG);cs.lpszClass=_afxWndFrameOrView;/COLOR_WINDOWbackgroundif(cs.style&WS_BORDER)cs.dwExStyle|=WS_EX_CLIENTEDGE;cs.style&=WS_BORDER;returnTRUE;BOOLCTestView:PreC

32、reateWindow(CREATESTRUCT&cs)/TODO:ModifytheWindowclassorstylesherebymodifying/theCREATESTRUCTcsreturnCView:PreCreateWindow(cs);有几点要说明（1）m_pMainWnd，头文件里并没有这个变量呀？噢，这个在基类里定义的public类型的变量，所以，他是通过继承得到的。(2)你注意过吗，当我们一点运行，会默认出来一个视图窗口，这是谁调用的呢？哦，就是下面这几行，它调用了opendocument()函数。CCommandLineInfocmdInfo;ParseCommand

33、Line(cmdInfo);if(!ProcessShellCommand(cmdInfo)returnFALSE；（3）这个函数有个关键的地方CMultiDocTemplate*pDocTemplate;pDocTemplate=newCMultiDocTemplate(IDR_myTYPE,RUNTIME_CLASS(CmyDoc),RUNTIME_CLASS(CChildFrame),/自定义MDI子框架RUNTIME_CLASS(CmyView);if(!pDocTemplate)returnFALSE;AddDocTemplate(pDocTemplate);通过它，把视图，窗口和文

34、档结合起来。4:主窗口CMainFrame的创建(1)通过CMainFrame*pMainFrame=newCMainFrame;我们得到的是不断调用的基类CMainFrame:CMainFrame()/TODO:在此添加成员初始化代码CMDIFrameWnd:CMDIFrameWnd()m_hWndMDIClient=NULL;CFrameWnd:CFrameWnd()ASSERT(m_hWnd=NULL);m_nWindow=-1;/unknownwindowIDm_bAutoMenuEnable=TRUE;/autoenableonbydefaultm_lpfnCloseProc=NUL

35、L;m_hMenuDefault=NULL;m_hAccelTable=NULL;m_nIDHelp=0;m_nIDTracking=0;m_nIDLastMessage=0;m_pViewActive=NULL;m_cModalStack=0;/initializemodalitysupportm_phWndDisable=NULL;m_pNotifyHook=NULL;m_hMenuAlt=NULL;m_nIdleFlags=0;/noidleworkatstartm_rectBorder.SetRectEmpty();m_bHelpMode=HELP_INACTIVE;/notinShi

36、ft+F1helpmodem_dwPromptContext=0;m_pNextFrameWnd=NULL;/notinlistyetm_bInRecalcLayout=FALSE;m_pFloatingFrameClass=NULL;m_nShowDelay=-1;/nodelaypendingAddFrameWnd();(2)pMainFrame-LoadFrame(IDR_MAINFRAME)所引发的一系列BOOLCMDIFrameWnd:LoadFrame(UINTnIDResource,DWORDdwDefaultStyle,CWnd*pParentWnd,CCreateContex

37、t*pContext)if(!CFrameWnd:LoadFrame(nIDResource,dwDefaultStyle,pParentWnd,pContext)returnFALSE;/savemenutousewhennoactiveMDIchildwindowispresentASSERT(m_hWnd!=NULL);m_hMenuDefault=:GetMenu(m_hWnd);if(m_hMenuDefault=NULL)TRACE(traceAppMsg,0,Warning:CMDIFrameWndwithoutadefaultmenu.n);returnTRUE;BOOLCFr

38、ameWnd:LoadFrame(UINTnIDResource,DWORDdwDefaultStyle,CWnd*pParentWnd,CCreateContext*pContext)/onlydothisonceASSERT_VALID_IDR(nIDResource);ASSERT(m_nIDHelp=0|m_nIDHelp=nIDResource);m_nIDHelp=nIDResource;/IDforhelpcontext(+HID_BASE_RESOURCE)CStringstrFullString;if(strFullString.LoadString(nIDResource)

39、AfxExtractSubString(m_strTitle,strFullString,0);/firstsub-stringVERIFY(AfxDeferRegisterClass(AFX_WNDFRAMEORVIEW_REG);/attempttocreatethewindowLPCTSTRlpszClass=GetIconWndClass(dwDefaultStyle,nIDResource);CStringstrTitle=m_strTitle;if(!Create(lpszClass,strTitle,dwDefaultStyle,rectDefault,pParentWnd,MA

40、KEINTRESOURCE(nIDResource),0L,pContext)returnFALSE;/willselfdestructonfailurenormally/savethedefaultmenuhandleASSERT(m_hWnd!=NULL);m_hMenuDefault=:GetMenu(m_hWnd);/loadacceleratorresourceLoadAccelTable(MAKEINTRESOURCE(nIDResource);if(pContext=NULL)/sendinitialupdateSendMessageToDescendants(WM_INITIA

41、LUPDATE,0,0,TRUE,TRUE);returnTRUE;BOOLCFrameWnd:Create(LPCTSTRlpszClassName,LPCTSTRlpszWindowName,DWORDdwStyle,constRECT&rect,CWnd*pParentWnd,LPCTSTRlpszMenuName,DWORDdwExStyle,CCreateContext*pContext)HMENUhMenu=NULL;if(lpszMenuName!=NULL)/loadinamenuthatwillgetdestroyedwhenwindowgetsdestroyedHINSTA

42、NCEhInst=AfxFindResourceHandle(lpszMenuName,RT_MENU);if(hMenu=:LoadMenu(hInst,lpszMenuName)=NULL)TRACE(traceAppMsg,0,Warning:failedtoloadmenuforCFrameWnd.n);PostNcDestroy();/perhapsdeletetheC+objectreturnFALSE;m_strTitle=lpszWindowName;/savetitleforlaterif(!CreateEx(dwExStyle,lpszClassName,lpszWindo

43、wName,dwStyle,rect.left,rect.top,rect.right-rect.left,rect.bottom-rect.top,pParentWnd-GetSafeHwnd(),hMenu,(LPVOID)pContext)TRACE(traceAppMsg,0,Warning:failedtocreateCFrameWnd.n);if(hMenu!=NULL)DestroyMenu(hMenu);returnFALSE;returnTRUE;因为CFrameWnd没有重新写CreateEX,所以是调用的基类的CreateEx的函数：BOOLCWnd:CreateEx(D

44、WORDdwExStyle,LPCTSTRlpszClassName,LPCTSTRlpszWindowName,DWORDdwStyle,intx,inty,intnWidth,intnHeight,HWNDhWndParent,HMENUnIDorHMenu,LPVOIDlpParam)/allowmodificationofseveralcommoncreateparametersCREATESTRUCTcs;cs.dwExStyle=dwExStyle;cs.lpszClass=lpszClassName;cs.lpszName=lpszWindowName;cs.style=dwSt

45、yle;cs.x=x;cs.y=y;cs.cx=nWidth;cs.cy=nHeight;cs.hwndParent=hWndParent;cs.hMenu=nIDorHMenu;cs.hInstance=AfxGetInstanceHandle();cs.lpCreateParams=lpParam;if(!PreCreateWindow(cs)PostNcDestroy();returnFALSE;AfxHookWindowCreate(this);HWNDhWnd=:CreateWindowEx(cs.dwExStyle,cs.lpszClass,cs.lpszName,cs.style

46、,cs.x,cs.y,cs.cx,cs.cy,cs.hwndParent,cs.hMenu,cs.hInstance,cs.lpCreateParams);#ifdef_DEBUGif(hWnd=NULL)TRACE(traceAppMsg,0,Warning:Windowcreationfailed:GetLastErrorreturns0 x%8.8Xn,GetLastError();#endifif(!AfxUnhookWindowCreate()PostNcDestroy();/cleanupifCreateWindowExfailstoosoonif(hWnd=NULL)return

47、FALSE;ASSERT(hWnd=m_hWnd);/shouldhavebeensetinsendmsghookreturnTRUE;可以看到，:CreateWindowEx是一个全局的函数，在其中触发WM_CREATE消息，进而调用我们自己定义的CMainFrame:OnCreate()intCMainFrame:OnCreate(LPCREATESTRUCTlpCreateStruct)if(CMDIFrameWnd:OnCreate(lpCreateStruct)=-1)return-1;if(!m_wndToolBar.CreateEx(this,TBSTYLE_FLAT,WS_CH

48、ILD|WS_VISIBLE|CBRS_TOP|CBRS_GRIPPER|CBRS_TOOLTIPS|CBRS_FLYBY|CBRS_SIZE_DYNAMIC)|!m_wndToolBar.LoadToolBar(IDR_MAINFRAME)TRACE0(未能创建工具栏n);return-1;/未能创建if(!m_wndStatusBar.Create(this)|!m_wndStatusBar.SetIndicators(indicators,sizeof(indicators)/sizeof(UINT)TRACE0(未能创建状态栏n);return-1;/未能创建/TODO:如果不需要工具

49、栏可停靠，则删除这三行m_wndToolBar.EnableDocking(CBRS_ALIGN_ANY);EnableDocking(CBRS_ALIGN_ANY);DockControlBar(&m_wndToolBar);return0;5:运行后为什么能产生CMainFarme，文档，视图以及视图外包围的farme呢？你注意过吗，当我们一点运行，会默认出来一个视图窗口，这是谁调用的呢？哦，就是下面这几行，它调用voidCWinApp:OnFileNew()函数.CCommandLineInfocmdInfo;ParseCommandLine(cmdInfo);if(!ProcessSh

50、ellCommand(cmdInfo)returnFALSE；你可以自己跟踪以下。这里有个小技巧，你可以在BOOLCmyDoc:OnNewDocument()处设立断点，然后“跳出”，最后你会达到起始点!ProcessShellCommand(cmdInfo)voidCWinApp:OnFileNew()if(m_pDocManager!=NULL)m_pDocManager-OnFileNew();/接着调用下面的函数voidCDocManager:OnFileNew()if(m_templateList.IsEmpty()TRACE(traceAppMsg,0,Error:nodocume

51、nttemplatesregisteredwithCWinApp.n);AfxMessageBox(AFX_IDP_FAILED_TO_CREATE_DOC);return;CDocTemplate*pTemplate=(CDocTemplate*)m_templateList.GetHead();if(m_templateList.GetCount()1)/morethanonedocumenttemplatetochoosefrom/bringupdialogpromptinguserCNewTypeDlgdlg(&m_templateList);INT_PTRnID=dlg.DoModa

52、l();if(nID=IDOK)pTemplate=dlg.m_pSelectedTemplate;elsereturn;/none-canceloperationASSERT(pTemplate!=NULL);ASSERT_KINDOF(CDocTemplate,pTemplate);pTemplate-OpenDocumentFile(NULL);/接着调用下面的函数/ifreturnsNULL,theuserhasalreadybeenalertedCDocument*CMultiDocTemplate:OpenDocumentFile(LPCTSTRlpszPathName,BOOLb

53、MakeVisible)CDocument*pDocument=CreateNewDocument();/产生模板控制之一：文档if(pDocument=NULL)TRACE(traceAppMsg,0,CDocTemplate:CreateNewDocumentreturnedNULL.n);AfxMessageBox(AFX_IDP_FAILED_TO_CREATE_DOC);returnNULL;ASSERT_VALID(pDocument);BOOLbAutoDelete=pDocument-m_bAutoDelete;pDocument-m_bAutoDelete=FALSE;/dontdestroyifsomethingg