向导生成默认代码

在·int CMainFrame::OnCreate(LPCREATESTRUCT lpCreateStruct)`函数生成TAB样式视图默认代码

CMDITabInfo mdiTabParams;
mdiTabParams.m_style = CMFCTabCtrl::STYLE_3D_ONENOTE; // 其他可用样式...
mdiTabParams.m_bActiveTabCloseButton = TRUE;      // 设置为 FALSE 会将关闭按钮放置在选项卡区域的右侧
mdiTabParams.m_bTabIcons = FALSE;    // 设置为 TRUE 将在 MDI 选项卡上启用文档图标
mdiTabParams.m_bAutoColor = TRUE;    // 设置为 FALSE 将禁用 MDI 选项卡的自动着色
mdiTabParams.m_bDocumentMenu = TRUE; // 在选项卡区域的右边缘启用文档菜单
EnableMDITabbedGroups(TRUE, mdiTabParams);

禁用关闭按钮修改代码

CMDITabInfo mdiTabParams;
mdiTabParams.m_style = CMFCTabCtrl::STYLE_3D_ONENOTE; // 其他可用样式...
mdiTabParams.m_bActiveTabCloseButton = FALSE;      // 设置为 FALSE 会将关闭按钮放置在选项卡区域的右侧
mdiTabParams.m_bTabIcons = FALSE;    // 设置为 TRUE 将在 MDI 选项卡上启用文档图标
mdiTabParams.m_bAutoColor = TRUE;    // 设置为 FALSE 将禁用 MDI 选项卡的自动着色
mdiTabParams.m_bDocumentMenu = TRUE; // 在选项卡区域的右边缘启用文档菜单
mdiTabParams.m_bTabCloseButton = FALSE;
EnableMDITabbedGroups(TRUE, mdiTabParams);

修改内容

1. 将mdiTabParams.m_bActiveTabCloseButton = TRUE;修改为mdiTabParams.m_bActiveTabCloseButton = FALSE;
2. 增加mdiTabParams.m_bTabCloseButton = FALSE;行，禁用关闭按钮。

参考资料

https://www.3dbuzz.com/forum/threads/185778-MFC-MDI-TabbedView-Disabling-Close

参考资料代码:

void CChildFrame::OnSetFocus(CWnd* pOldWnd)
{

    CMainFrame* pFrame= (CMainFrame*) AfxGetMainWnd(); //Get Handle to MainFrame
    CMDIChildWnd* pActiveChild = pFrame->MDIGetActive();
    CView* pActivateView = pActiveChild->GetActiveView();

    if ( pActiveChild != NULL ){
        CDocument* pDoc = (CPeterRobertsConsultingDoc*)pActiveChild->GetActiveDocument();


        if(((NULL != pDoc) && pActivateView->IsKindOf(RUNTIME_CLASS(cMainView))))
        {
            //View IS cMainView and should not be closed            

            CMDITabInfo mdiTabParams;
            mdiTabParams.m_style = CMFCTabCtrl::STYLE_3D_ONENOTE; // other styles available...
            mdiTabParams.m_bActiveTabCloseButton = false;      // set to FALSE to place close button at right of tab area
            mdiTabParams.m_bTabIcons = FALSE;    // set to TRUE to enable document icons on MDI taba
            mdiTabParams.m_bAutoColor = TRUE;    // set to FALSE to disable auto-coloring of MDI tabs
            mdiTabParams.m_bDocumentMenu = TRUE; // enable the document menu at the right edge of the tab area
            mdiTabParams.m_bTabCloseButton = false;
            pFrame->EnableMDITabbedGroups(TRUE, mdiTabParams);

        }else{

            CMDITabInfo mdiTabParams;
            mdiTabParams.m_style = CMFCTabCtrl::STYLE_3D_ONENOTE; // other styles available...
            mdiTabParams.m_bActiveTabCloseButton = true;      // set to FALSE to place close button at right of tab area
            mdiTabParams.m_bTabIcons = FALSE;    // set to TRUE to enable document icons on MDI taba
            mdiTabParams.m_bAutoColor = TRUE;    // set to FALSE to disable auto-coloring of MDI tabs
            mdiTabParams.m_bDocumentMenu = TRUE; // enable the document menu at the right edge of the tab area
            mdiTabParams.m_bTabCloseButton = true;
            pFrame->EnableMDITabbedGroups(TRUE, mdiTabParams);
        }
    }


CMDIChildWndEx::OnSetFocus(pOldWnd);
}