MFC document view framework (relationship between classes)

Document view mode

One 、 Create document view mode

• It will generate automatically 4 Classes also correspond to 4 Group files （ The header file 、cpp file ）
• CTestApp class
  • This is where the program starts
  • This is the whole class of the whole software 、 Main thread class 、 Responsible for message circulation and user interaction
• CTestView class
  • This is a view class
  • It is mainly used to display some interface information , data 、 Image, etc
• CTestDoc class
  • This is a document class
  • Mainly used for dealing with documents , For example, reading data from disk , Belong to “ Background data ”
• CMainFrame class
  • This is the main framework class
  • Mainly a framework ” Stereotype “, All the buttons 、 label 、 Edit boxes and so on are essentially windows , These windows are displayed on the frame
• As shown in the figure below
  

Two 、 The way of data transmission between classes

1. Universal

	-AfxGetApp() You can get CWinApp Application class pointer 
	-AfxGetApp()->m_pMainWnd** Get frame window pointer ( That is, the main window pointer )

2. APP class Get template pointer in

	- CWinApp::GetFirstDocTemlatePostion()
	- CWinApp::GetNextDocTemplate()

3. file Doc Class Get information about other classes

	- CDocument::GetFirstViewPosition()、CDocument::GetNextView() Traverse all views associated with the document 
	- CDocument::GetDocTemplate() Get the document template pointer 
	- CDocument::UpdateAllViews() Update all views 

4. View View class Get information about other classes in

	- CView::GetDocument() Get the corresponding document pointer 
	- CView::GetParentFrame() Get frame window 

5. frame MainFrame class Get data of other classes in

	- CFrameWnd::GetActiveView() Get the pointer of the currently active view 	
	- CFrameWnd::GetActiveDocument() Get the document pointer of the currently active view