MFC Single Document Interface (SDI) Programming Tutorial105

Introduction

The Single Document Interface (SDI) is a programming paradigm in the Microsoft Foundation Classes (MFC) framework that provides a user interface for working with a single document at a time. SDI applications are commonly used for creating and editing text documents, spreadsheets, and other types of single-file-based data.

Creating an SDI Application

To create an SDI application using MFC, you can use the Visual Studio wizard. Select "MFC Application" from the project templates and choose the "Single Document" option.

SDI Application Architecture

SDI applications consist of several main components:
CFrameWnd: The main application window that contains the document and other user interface elements.
CView: The view class that displays the document and handles user interaction.
CDocument: The document class that represents the data being edited.

Document/View Architecture

The Document/View architecture in SDI applications separates the data (document) from its presentation (view). The document class represents the raw data, while the view class is responsible for displaying the data in a specific manner. This separation allows for multiple views to be associated with a single document.

Creating a Document Class

To create a document class, derive your class from the CDocument base class. Define member variables to store the document's data and implement methods to load, save, and modify the data.

Creating a View Class

To create a view class, derive your class from the CView base class. In the view class, create the user interface elements that will display the document's data. Override the OnDraw method to handle drawing the document.

Linking Document and View

To link a document to a view, add the document as a member variable to the view class. Then, in the view's constructor, associate the document with the view using the SetDocument method.

Handling User Input

SDI applications handle user input through the view class. Override methods such as OnLButtonDown and OnMouseMove to handle mouse events. Use the GetDocument method to access the document and perform operations on it.

Menu and Toolbar Integration

SDI applications typically provide menu and toolbar options for interacting with the document. To create menus and toolbars, use the IDR_MAINFRAME resource ID in the resource file. Associate command handlers with menu items and toolbar buttons to handle user commands.

Additional Features

SDI applications can include additional features such as:
Multiple Document Interface (MDI) support to allow multiple documents to be open simultaneously.
File open/save dialogs for loading and saving documents.
Undo/Redo functionality for reversing or re-performing user actions.

Conclusion

SDI programming in MFC provides a structured approach for creating single-document applications. By understanding the Document/View architecture and following the best practices outlined in this tutorial, you can develop robust and user-friendly SDI applications.

2024-11-07

Previous：Programming Cat Video Tutorials

Next：AI Tutorial: Creating Plush Objects in Midjourney