通常咱们使用的框架是VC提供的Wizard生成的
MFC App Wizard(exe)框架,不管是多文档仍是单文档,都存在
指针获取和操做问题。
下面这节内容主要是通常的框架,而后再讲多线程中的指针使用。使用到的类须要包含响应的头
文件。首先通常得到本类(视,文档,对话框都支持)实例指针 this,用this的目的,主要能够经过类中的函数向其余类或者函数中发指针,以便于在非本类中操做和使用本类中的功能。 这其中的关键在于理解 m_pMainWnd, AfxGetApp(),AfxGetMainWnd() 的意义!
1) 在View中得到Doc指针
CYouSDIDoc *pDoc=GetDocument();一个视只能有一个文档。
2) 在App中得到MainFrame指针
CWinApp 中的 m_pMainWnd变量就是MainFrame的指针,也能够: CMainFrame *pMain =(CMainFrame *)AfxGetMainWnd();
3) 在View中得到MainFrame指针
CMainFrame *pMain=(CmaimFrame *)AfxGetApp()->m_pMainWnd;
4) 得到View(已创建)指针
CMainFrame *pMain=(CmaimFrame *)AfxGetApp()->m_pMainWnd;
CyouView *pView=(CyouView *)pMain->GetActiveView();
5) 得到当前文档指针
CDocument * pCurrentDoc =(CFrameWnd *)m_pMainWnd->GetActiveDocument();
6) 得到状态栏与工具栏指针
CStatusBar * pStatusBar=(CStatusBar *)AfxGetMainWnd()->GetDescendantWindow(AFX_IDW_STATUS_BAR);
CToolBar * pToolBar=(CtoolBar *)AfxGetMainWnd()->GetDescendantWindow(AFX_IDW_TOOLBAR);
7) 若是框架中加入工具栏和状态栏变量还能够这样
(CMainFrame *)GetParent()->m_wndToolBar;
(CMainFrame *)GetParent()->m_wndStatusBar;
8) 在Mainframe得到菜单指针
CMenu *pMenu=m_pMainWnd->GetMenu();
9) 在任何类中得到应用
程序类
AfxGetInstanceHandle 获得
句柄,AfxGetApp 获得指针
B1.如何在本身的类和“应用程序类”中得到“文档类”的句柄?
SDI AfxGetMainWnd() -> GetActiveView() -> GetDocument() 获得指针
MDI AfxGetMainWnd() -> MDIGetActive() -> GetActiveView() -> GetDocument() 获得指针
B3.如何在“框架类”中得到“文档类”句柄?
SDI GetActiveView() -> GetDocument() 获得指针,MDI MDIGetActive() -> GetActiveView() -> GetDocument() 从 CMainFrame 获得指针,GetActiveView() -> GetDocument() 从 CChildFrame 获得指针
B4.如何在“视图类”中得到“文档类”句柄?
GetDocument()
C1.如何在“文档类”中得到“视图类”句柄?
GetView(),调用 GetFirstViewPosition 和 GetNextView 函数获得指针。
C2.如何在本身的类和“应用程序类”中得到“视图类”句柄?
SDI GetActiveView 获得指针
MDI MDIGetActive() -> GetActiveView() 从 CMainFrame 获得指针,GetActiveView 从 CChildFrame 获得指针
最后提醒你们,在提取到各个句柄以后,由于初次提取的都是标准类句柄,因此,在使用时要注意将标准句柄转换成本身的类的句柄。
如:
AfxGetApp();//获得的是WinApp类的句柄,
因此操做前记得转换成本身定义的类的句柄。
如:
((CMyApp*)AfxGetApp())->XXXX();//这的xxxx()就是你定义的类中间的成员。
另外,附上 MSDN 关于应用程序信息和管理的各个函数:
When you write an application, you create a single CWinApp-derived object. At times, you may want to get information about this object from outside the CWinApp-derived object.
The Microsoft Foundation Class Library provides the following global functions to help you accomplish these tasks:
Application Information and Management Functions
AfxFreeLibrary
Decrements the reference count of the loaded dynamic-link library (DLL) module; when the reference count reaches zero, the module is unmapped.
AfxGetApp
Returns a pointer to the application's single CWinApp object.
AfxGetAppName
Returns a string containing the application's name.
AfxGetInstanceHandle
Returns an HINSTANCE representing this instance of the application.
AfxGetMainWnd
Returns a pointer to the current "main" window of a non-OLE application, or the in-place frame window of a server application.
AfxGetResourceHandle
Returns an HINSTANCE to the source of the application's default resources. Use this to access the application's resources directly.
AfxInitRichEdit
Initializes the version 1.0 rich edit control for the application.
AfxInitRichEdit2
Initializes the version 2.0 and later rich edit control for the application.
AfxLoadLibrary
Maps a DLL module and returns a handle that can be used to get the address of a DLL function.
AfxRegisterWndClass
Registers a Windows window class to supplement those registered automatically by MFC.
AfxSocketInit
Called in a CWinApp::InitInstance override to initialize Windows Sockets.
AfxSetResourceHandle
Sets the HINSTANCE handle where the default resources of the application are loaded.
AfxRegisterClass
Registers a window class in a DLL that uses MFC.
AfxBeginThread
Creates a new thread.
AfxEndThread
Terminates the current thread.
AfxGetThread
Retrieves a pointer to the current CWinThread object.
AfxWinInit
Called by the MFC-supplied WinMain function, as part of the CWinApp initialization of a GUI-based application, to initialize MFC. Must be called directly for console applications using MFC.