关于new的申请与释放

[dnyz520]

不是说new了一个内存以后在不需要的时候应该释放吗?
但为什么MFC向导创建的部分找不到释放的部分呢?
比如下面这段代码.new了好多,没见到一个释放,如果要删除一个不用的按钮,那么我用的是函数删除的,那样不是泄露了吗?

void CMainFrame::InitializeRibbon()
{
	BOOL bNameValid;

	CString strTemp;
	bNameValid = strTemp.LoadString(IDS_RIBBON_FILE);
	ASSERT(bNameValid);

	// 加载面板图像:
	m_PanelImages.SetImageSize(CSize(16, 16));
	m_PanelImages.Load(IDB_BUTTONS);

	// 初始主按钮:
	m_MainButton.SetImage(IDB_MAIN);
	m_MainButton.SetText(_T("\nf"));
	m_MainButton.SetToolTipText(strTemp);

	m_wndRibbonBar.SetApplicationButton(&m_MainButton, CSize (45, 45));
	CMFCRibbonMainPanel* pMainPanel = m_wndRibbonBar.AddMainCategory(strTemp, IDB_FILESMALL, IDB_FILELARGE);

	bNameValid = strTemp.LoadString(IDS_RIBBON_NEW);
	ASSERT(bNameValid);
	pMainPanel->Add(new CMFCRibbonButton(ID_FILE_NEW, strTemp, 0, 0));
	bNameValid = strTemp.LoadString(IDS_RIBBON_OPEN);
	ASSERT(bNameValid);
	pMainPanel->Add(new CMFCRibbonButton(ID_FILE_OPEN, strTemp, 1, 1));
	bNameValid = strTemp.LoadString(IDS_RIBBON_SAVE);
	ASSERT(bNameValid);
	pMainPanel->Add(new CMFCRibbonButton(ID_FILE_SAVE, strTemp, 2, 2));
	bNameValid = strTemp.LoadString(IDS_RIBBON_SAVEAS);
	ASSERT(bNameValid);
	pMainPanel->Add(new CMFCRibbonButton(ID_FILE_SAVE_AS, strTemp, 3, 3));

	bNameValid = strTemp.LoadString(IDS_RIBBON_PRINT);
	ASSERT(bNameValid);
	CMFCRibbonButton* pBtnPrint = new CMFCRibbonButton(ID_FILE_PRINT, strTemp, 6, 6);
	pBtnPrint->SetKeys(_T("p"), _T("w"));
	bNameValid = strTemp.LoadString(IDS_RIBBON_PRINT_LABEL);
	ASSERT(bNameValid);
	pBtnPrint->AddSubItem(new CMFCRibbonLabel(strTemp));
	bNameValid = strTemp.LoadString(IDS_RIBBON_PRINT_QUICK);
	ASSERT(bNameValid);
	pBtnPrint->AddSubItem(new CMFCRibbonButton(ID_FILE_PRINT_DIRECT, strTemp, 7, 7, TRUE));
	bNameValid = strTemp.LoadString(IDS_RIBBON_PRINT_PREVIEW);
	ASSERT(bNameValid);
	pBtnPrint->AddSubItem(new CMFCRibbonButton(ID_FILE_PRINT_PREVIEW, strTemp, 8, 8, TRUE));
	bNameValid = strTemp.LoadString(IDS_RIBBON_PRINT_SETUP);
	ASSERT(bNameValid);
	pBtnPrint->AddSubItem(new CMFCRibbonButton(ID_FILE_PRINT_SETUP, strTemp, 11, 11, TRUE));
	pMainPanel->Add(pBtnPrint);
	pMainPanel->Add(new CMFCRibbonSeparator(TRUE));

	bNameValid = strTemp.LoadString(IDS_RIBBON_CLOSE);
	ASSERT(bNameValid);
	pMainPanel->Add(new CMFCRibbonButton(ID_FILE_CLOSE, strTemp, 9, 9));

	bNameValid = strTemp.LoadString(IDS_RIBBON_RECENT_DOCS);
	ASSERT(bNameValid);
	pMainPanel->AddRecentFilesList(strTemp);

	bNameValid = strTemp.LoadString(IDS_RIBBON_EXIT);
	ASSERT(bNameValid);
	pMainPanel->AddToBottom(new CMFCRibbonMainPanelButton(ID_APP_EXIT, strTemp, 15));

	//// 为“剪贴板”面板添加“主”类别:
	bNameValid = strTemp.LoadString(IDS_RIBBON_HOME);
	ASSERT(bNameValid);
	CMFCRibbonCategory* pCategoryHome = m_wndRibbonBar.AddCategory(strTemp, IDB_WRITESMALL, IDB_WRITELARGE);

	//// 创建“剪贴板”面板:
	//bNameValid = strTemp.LoadString(IDS_RIBBON_CLIPBOARD);
	//ASSERT(bNameValid);
	//CMFCRibbonPanel* pPanelClipboard = pCategoryHome->AddPanel(strTemp, m_PanelImages.ExtractIcon(27));

	//bNameValid = strTemp.LoadString(IDS_RIBBON_PASTE);
	//ASSERT(bNameValid);
	//CMFCRibbonButton* pBtnPaste = new CMFCRibbonButton(ID_EDIT_PASTE, strTemp, 0, 0);
	//pPanelClipboard->Add(pBtnPaste);

	//bNameValid = strTemp.LoadString(IDS_RIBBON_CUT);
	//ASSERT(bNameValid);
	//pPanelClipboard->Add(new CMFCRibbonButton(ID_EDIT_CUT, strTemp, 1));
	//bNameValid = strTemp.LoadString(IDS_RIBBON_COPY);
	//ASSERT(bNameValid);
	//pPanelClipboard->Add(new CMFCRibbonButton(ID_EDIT_COPY, strTemp, 2));
	//bNameValid = strTemp.LoadString(IDS_RIBBON_SELECTALL);
	//ASSERT(bNameValid);
	//pPanelClipboard->Add(new CMFCRibbonButton(ID_EDIT_SELECT_ALL, strTemp, -1));

	// 创建和添加“视图”面板:
	bNameValid = strTemp.LoadString(IDS_RIBBON_VIEW);
	ASSERT(bNameValid);
	CMFCRibbonPanel* pPanelView = pCategoryHome->AddPanel(strTemp, m_PanelImages.ExtractIcon (7));

	CMFCRibbonButtonsGroup* pButtonsGroup1 = new CMFCRibbonButtonsGroup;
	pButtonsGroup1->AddButton(new CMFCRibbonButton (ID_VIEW_STATUS_BAR, _T("") ,0));
	pButtonsGroup1->AddButton(new CMFCRibbonButton (ID_VIEW_TEMPLATE, _T("") ,1));
	pButtonsGroup1->AddButton(new CMFCRibbonButton (ID_VIEW_CONTROLS_LIST, _T("") ,2));
	pButtonsGroup1->AddButton(new CMFCRibbonButton (ID_VIEW_CONTROLS_PROPERTY, _T("") ,3));
	pButtonsGroup1->AddButton(new CMFCRibbonButton (ID_VIEW_OUTPUT, _T("") ,4));
	pButtonsGroup1->AddButton(new CMFCRibbonButton (ID_VIEW_RESET, _T(""), 5));
	pPanelView->Add(pButtonsGroup1);

	// 创建和添加“操作”面板:
	CMFCRibbonPanel* pPanelOperation = pCategoryHome->AddPanel(_T("操作"), m_PanelImages.ExtractIcon (7));
	pPanelOperation->Add(new CMFCRibbonButton (ID_OPERATION_DISPLAYDATA, _T("显示数据\nf"), -1, 1));
	pPanelOperation->Add(new CMFCRibbonButton (ID_OPERATION_DELETEDATA, _T("删除数据\nd"), -1, 1));
	pPanelOperation->Add (new CMFCRibbonSeparator);

	// 将元素添加到选项卡右侧:
	bNameValid = strTemp.LoadString(IDS_RIBBON_STYLE);
	ASSERT(bNameValid);
	CMFCRibbonButton* pVisualStyleButton = new CMFCRibbonButton(-1, strTemp, -1, -1);

	pVisualStyleButton->SetMenu(IDR_THEME_MENU, FALSE /* 无默认命令*/, TRUE /* 右对齐*/);

	bNameValid = strTemp.LoadString(IDS_RIBBON_STYLE_TIP);
	ASSERT(bNameValid);
	pVisualStyleButton->SetToolTipText(strTemp);
	bNameValid = strTemp.LoadString(IDS_RIBBON_STYLE_DESC);
	ASSERT(bNameValid);
	pVisualStyleButton->SetDescription(strTemp);
	m_wndRibbonBar.AddToTabs(pVisualStyleButton);

	//右侧帮助元素
	bNameValid = strTemp.LoadString(IDS_RIBBON_HELP);
	ASSERT(bNameValid);
	CMFCRibbonButton* pOnlineHelpButton = new CMFCRibbonButton(ID_ONLINE_HELP, strTemp, -1, -1);
	m_wndRibbonBar.AddToTabs(pOnlineHelpButton);

	////////////////////////////////////////////////////////////////////////////
	//右侧更新元素
	bNameValid = strTemp.LoadString(IDS_RIBBON_UPDATA);
	ASSERT(bNameValid);
	CMFCRibbonButton* pSoftwareUpButton = new CMFCRibbonButton(ID_DATA_UP, strTemp, -1, -1);
	m_wndRibbonBar.AddToTabs(pSoftwareUpButton);

	////////////////////////////////////////////////////////////////////////////
	//右侧注册元素
	bNameValid = strTemp.LoadString(IDS_RIBBON_KEY);
	ASSERT(bNameValid);
	CMFCRibbonButton* pSoftwareKeyButton = new CMFCRibbonButton(ID_SOFT_KEY, strTemp, -1, -1);
	m_wndRibbonBar.AddToTabs(pSoftwareKeyButton);

	// 添加快速访问工具栏命令:
	CList<UINT, UINT> lstQATCmds;

	lstQATCmds.AddTail(ID_FILE_NEW);
	lstQATCmds.AddTail(ID_FILE_OPEN);
	lstQATCmds.AddTail(ID_FILE_SAVE);
	lstQATCmds.AddTail(ID_FILE_PRINT_DIRECT);

	m_wndRibbonBar.SetQuickAccessCommands(lstQATCmds);

	m_wndRibbonBar.AddToTabs(new CMFCRibbonButton(ID_APP_ABOUT, _T("\na"), m_PanelImages.ExtractIcon (0)));
}

[an_bachelor]

实际上是有释放的 new出来的内存 因为不会自动释放 所以不一定是在new他的函数写完之后 就不要用了
它可以在函数内new 却在这个函数外被delete

[A1erX]

一般来讲，对于应用程序，new后你不显式的释放，在程序退出后，系统会自动帮你释放，但是对于内核驱动来说，创建的堆，如果不释放，除非系统重启，否则那块内存就无法使用。

但是，严格来讲，不管应用程序也好，内核驱动也好，NEW后，如果你不再使用了，就将其释放，这样可以节省出内存给用户，要不然，有可能，你的系统有可能内存不足了~

[快乐鹦鹉]

CMFCRibbonMainPanel* pMainPanel = m_wndRibbonBar.AddMainCategory(strTemp, IDB_FILESMALL, IDB_FILELARGE);

bNameValid = strTemp.LoadString(IDS_RIBBON_NEW);
ASSERT(bNameValid);
pMainPanel->Add(new CMFCRibbonButton(ID_FILE_NEW, strTemp, 0, 0));
===================
这里new出来的对象是由pMainPanel管理的。只有pMainPanel才能决定这些对象是否还有用。你应该可以在CMFCRibbonMainPanel类的源码中找到这些对象的delete操作。

[dnfreeuser]

谁申请，谁释放
你NEW的，那就你释放，系统NEW的，别担心，它会自己释放的，只不过位置可能不在这里

[Benjamin_Hua]

pMainPanel->Add(new CMFCRibbonButton(ID_FILE_NEW, strTemp, 0, 0));

pMainPanel会帮你释放的。