Explain the Document/View Architecture in MFC

The document/view architecture in MFC separates the data (document) from its representation (view). This design pattern allows multiple views to share the same data, promoting reusability and flexibility.

In MFC, the CDocument class represents the document, while CView manages how the document is displayed. The framework handles the communication between them.

Here is a simplified flow:

• The document stores the application’s data.
• The view displays the data and interacts with the user.
• Any updates to the document are reflected in all views.

Example code for linking document and view:

// Document class
class CMyDoc : public CDocument
{
    // Document data and serialization functions
};

// View class
class CMyView : public CView
{
    void OnDraw(CDC* pDC)
    {
        // Code to draw the document data
    }
};

This architecture makes it easier to handle large applications by maintaining separation between data and UI.