MFC:禁用SDI应用程序中的新文件和保存文件功能

您可以处理更新UI消息:

ON_UPDATE_COMMAND_UI(ID_FILE_NEW, OnUpdateFileNew)
ON_UPDATE_COMMAND_UI(ID_FILE_SAVE, OnUpdateFileSave)

...

void CMainFrame::OnUpdateFileNew(CCmdUI *pCmdUI)
{
    pCmdUI->Enable( FALSE );
}

void CMainFrame::OnUpdateFileSave(CCmdUI *pCmdUI)
{
    pCmdUI->Enable( FALSE );
}

重写 CWinApp::OnFileNew 有自己的功能,如下所示。

BEGIN_MESSAGE_MAP(CMyApp, CWinApp)
    ON_COMMAND(ID_APP_ABOUT, &CMyApp::OnAppAbout)
    // Standard file based document commands
    **//ON_COMMAND(ID_FILE_NEW, &CWinApp::OnFileNew)**
    ON_COMMAND(ID_FILE_NEW, &CMyApp::OnFileNew)
    ON_COMMAND(ID_FILE_OPEN, &CWinApp::OnFileOpen)
    // Standard print setup command
    ON_COMMAND(ID_FILE_PRINT_SETUP, &CWinApp::OnFilePrintSetup)
END_MESSAGE_MAP()


void CMyApp::OnFileNew()
{
         //Create a static member variable to hold the state. For the first time create a docment. From next time avoid calling CWinApp::OnFileNew();
    if( m_bDocCreated == FALSE )
    {
        CString strMsg;
        strMsg.Format( L"Create New DOC" );
        AfxMessageBox( strMsg );

        CWinApp::OnFileNew();
        m_bDocCreated = TRUE;
    }
    else
    {
        CFrameWnd* pFrame = (CFrameWnd*)AfxGetMainWnd();
        CMyDoc* pDoc = (CMyDoc*)pFrame->GetActiveDocument();
        CString strMsg;
        strMsg.Format( L"Doc ID = %ld",pDoc->m_lIndex );
        AfxMessageBox( strMsg );

    }


}

呼叫 CMenu::EnableMenuItem 带有适当的菜单项和 MF_DISABLED 作为第二个参数。这里是 documentation .