问题描述

mfc中关于未声明的标识符的一个问题

请问各位这个问题怎么解决？

解决方案

// MFCApplication1.cpp : Defines the class behaviors for the application.//#include ""stdafx.h""#include ""afxwinappex.h""#include ""afxdialogex.h""#include ""MFCApplication1.h""#include ""MainFrm.h""#include ""ChildFrm.h""#include ""MFCApplication1Doc.h""#include ""MFCApplication1View.h""#ifdef _DEBUG#define new DEBUG_NEW#endif// CMFCApplication1AppBEGIN_MESSAGE_MAP(CMFCApplication1App CWinAppEx)    ON_COMMAND(ID_APP_ABOUT &CMFCApplication1App::OnAppAbout)    // Standard file based document commands    ON_COMMAND(ID_FILE_NEW &CWinAppEx::OnFileNew)    ON_COMMAND(ID_FILE_OPEN &CWinAppEx::OnFileOpen)    // Standard print setup command    ON_COMMAND(ID_FILE_PRINT_SETUP &CWinAppEx::OnFilePrintSetup)END_MESSAGE_MAP()// CMFCApplication1App constructionCMFCApplication1App::CMFCApplication1App(){    m_bHiColorIcons = TRUE;    // support Restart Manager    m_dwRestartManagerSupportFlags = AFX_RESTART_MANAGER_SUPPORT_ALL_ASPECTS;#ifdef _MANAGED    // If the application is built using Common Language Runtime support (/clr):    //     1) This additional setting is needed for Restart Manager support to work properly.    //     2) In your project you must add a reference to System.Windows.Forms in order to build.    System::Windows::Forms::Application::SetUnhandledExceptionMode(System::Windows::Forms::UnhandledExceptionMode::ThrowException);#endif    // TODO: replace application ID string below with unique ID string; recommended    // format for string is CompanyName.ProductName.SubProduct.VersionInformation    SetAppID(_T(""MFCApplication1.AppID.NoVersion""));    // TODO: add construction code here    // Place all significant initialization in InitInstance}// The one and only CMFCApplication1App objectCMFCApplication1App theApp;// CMFCApplication1App initializationBOOL CMFCApplication1App::InitInstance(){    // InitCommonControlsEx() is required on Windows XP if an application    // manifest specifies use of ComCtl32.dll version 6 or later to enable    // visual styles.  Otherwise any window creation will fail.    INITCOMMONCONTROLSEX InitCtrls;    InitCtrls.dwSize = sizeof(InitCtrls);    // Set this to include all the common control classes you want to use    // in your application.    InitCtrls.dwICC = ICC_WIN95_CLASSES;    InitCommonControlsEx(&InitCtrls);    CWinAppEx::InitInstance();    // Initialize OLE libraries    if (!AfxOleInit())    {        AfxMessageBox(IDP_OLE_INIT_FAILED);        return FALSE;    }    AfxEnableControlContainer();    EnableTaskbarInteraction();    // AfxInitRichEdit2() is required to use RichEdit control       // AfxInitRichEdit2();    // Standard initialization    // If you are not using these features and wish to reduce the size    // of your final executable you should remove from the following    // the specific initialization routines you do not need    // Change the registry key under which our settings are stored    // TODO: You should modify this string to be something appropriate    // such as the name of your company or organization    SetRegistryKey(_T(""Local AppWizard-Generated Applications""));    LoadStdProfileSettings(4);  // Load standard INI file options (including MRU)    InitContextMenuManager();    InitShellManager();    InitKeyboardManager();    InitTooltipManager();    CMFCToolTipInfo ttParams;    ttParams.m_bVislManagerTheme = TRUE;    theApp.GetTooltipManager()->SetTooltipParams(AFX_TOOLTIP_TYPE_ALL        RUNTIME_CLASS(CMFCToolTipCtrl) &ttParams);    // Register the application's document templates.  Document templates    //  serve as the connection between documents frame windows and views    CMultiDocTemplate* pDocTemplate;    pDocTemplate = new CMultiDocTemplate(IDR_MFCApplication1TYPE        RUNTIME_CLASS(CMFCApplication1Doc)        RUNTIME_CLASS(CChildFrame) // custom MDI child frame        RUNTIME_CLASS(CMFCApplication1View));    if (!pDocTemplate)        return FALSE;    AddDocTemplate(pDocTemplate);    // create main MDI Frame window    CMainFrame* pMainFrame = new CMainFrame;    if (!pMainFrame || !pMainFrame->LoadFrame(IDR_MAINFRAME))    {        delete pMainFrame;        return FALSE;    }    m_pMainWnd = pMainFrame;    // Parse command line for standard shell commands DDE file open    CCommandLineInfo cmdInfo;    ParseCommandLine(cmdInfo);    // Dispatch commands specified on the command line.  Will return FALSE if    // app was launched with /RegServer /Register /Unregserver or /Unregister.    if (!ProcessShellCommand(cmdInfo))        return FALSE;    // The main window has been initialized so show and update it    pMainFrame->ShowWindow(m_nCmdShow);    pMainFrame->UpdateWindow();    return TRUE;}int CMFCApplication1App::ExitInstance(){    //TODO: handle additional resources you may have added    AfxOleTerm(FALSE);    return CWinAppEx::ExitInstance();}// CMFCApplication1App message handlers// CAboutDlg dialog used for App Aboutclass CAboutDlg : public CDialogEx{public:    CAboutDlg();// Dialog Data    enum { IDD = IDD_ABOUTBOX };protected:    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support// Implementationprotected:    DECLARE_MESSAGE_MAP()};CAboutDlg::CAboutDlg() : CDialogEx(CAboutDlg::IDD){}void CAboutDlg::DoDataExchange(CDataExchange* pDX){    CDialogEx::DoDataExchange(pDX);}BEGIN_MESSAGE_MAP(CAboutDlg CDialogEx)END_MESSAGE_MAP()// App command to run the dialogvoid CMFCApplication1App::OnAppAbout(){    CAboutDlg aboutDlg;    aboutDlg.DoModal();}// CMFCApplication1App customization load/save methodsvoid CMFCApplication1App::PreLoadState(){    BOOL bNameValid;    CString strName;    bNameValid = strName.LoadString(IDS_EDIT_MENU);    ASSERT(bNameValid);    GetContextMenuManager()->AddMenu(strName IDR_POPUP_EDIT);    bNameValid = strName.LoadString(IDS_EXPLORER);    ASSERT(bNameValid);    GetContextMenuManager()->AddMenu(strName IDR_POPUP_EXPLORER);}void CMFCApplication1App::LoadCustomState(){}void CMFCApplication1App::SaveCustomState(){}// CMFCApplication1App message handlers

解决方案二：
你这个是什么版本的VC++
CMFC开头的类是微软买下bcgsoft公司的一套控件，并且提供给vs2010以上的用户使用的。如果你版本太旧，就不好使。
另外，如果是从别的地方粘贴来的，检查下是不是缺少头文件。最好用向导创建一个。

解决方案三：
你的这代码哪里来的，别的地方写的，在你的电脑上打开，还是就是在你的电脑上创建的。你的vs有没有安装vc++桌面支持和mfc库。

解决方案四：
这是默认模板，你对照下，我这里通过编译

解决方案五：
很明显是没头文件嘛