1th Lesson GUI Program Principle Analysis

1. Command- line Applications

(1) Features of the command line application

① is an executable program based on sequential execution structure

② does not need to interact with the user during program execution

③ The final running results after the execution of the program

(2) Run mode of command line application--the program runs with fixed start and end

(3) Application for command line applications

① Single Task Occasion

② invalid mutual or simple interaction occasions

③ Server Applications

2. Graphical Interface application

(1) The emergence of graphical interface applications

① with the development of computer technology, computers go into daily life

② computer programs begin to deal with problems in various fields

③ Computer User is no longer a professional computer worker

(2) Features of graphical interface applications

① is a message-driven model-based executable program

② the execution of a program depends on the user's interaction process

③ Real-time response to user actions during program execution

④ in general, the program does not actively exit after the execution of

(3) operation mode of graphical interface application

(4) Message processing model of graphical interface application

(5) Applications for graphical interface application

① Multi-tasking occasions

② Strong user interaction occasions

③ non-professional computer users

3. Graphical interface Program VS command line program

Architecture model of modern large-scale software products

4. Summary

Command-line Application	Graphical interface Applications
Execution structure based on order	Based on the message-driven model
Weak interactive execution	Strong Interactive execution
Run by user trigger	Run by user trigger
Active End	End by user trigger

1th Lesson GUI Program Principle Analysis