Introduction to Visal Programming

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INTRODUCTION TO VISUAL

PROGRAMMING

K.Muneeswaran


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Windows Programming Vs VisualProgramming

VP - deals with GUI front end and its programming

WP deals with connecting windows (front end) with

applications (backend) and its programming


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is a rectangular area of the screen where the application displaysoutput and receives input from the user.

The first task of the application is to create a window.

Shares the screen with other windows, including those from

other applications.

Only one window at a time can receive input from the user.

The user can use the

Mouse

Keyboard

other input device

to interact with this window and the application that owns it.

WINDOW Win 32 Application


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VC++ has two modes of operations

Text based (conventional programming - main)

GUI based (Programs linked with windows and GUI

controls - WinMain)

WinMain Application Entry and Parameters

Handle to current Instance

Handle to previous instance (multiple instance of the

applications are supported)

Command Line Arguments

Style of window


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Software Development Kit (SDK)

A set of tools and libraries for creating software

applications for Windows operating systems

MFC

The Microsoft Foundation Class Library is an

"application framework" for programming in Microsoft

Windows

Application Wizard

Generates a new, fully functional application from which

one can build a more complex application

MS - Visual Programming


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SDK

Makes use of the windows API written in C language

Every time window attributes have to be specified and

registered


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MFC

MS provides a rich set of classes of window objects andcontrols specifying their attributes

C++ based

Made up of ready made classes

Both applications and windows are class based

CWinApp

The base class from which you derive a

Windows application object

CWnd

Provides the base functionality of all window

classes in the Microsoft Foundation Class

Library.


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Application Wizard

Ease the developers work

Developer needs to know the structure of VC++

Template header and C++ files are automatically created


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CObject

CCmdTarget

CWnd

CException

CFile

CDC

CArray

Class Hierarchy


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Derivation of CDialogBar


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Derivation of CDialog


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is a structure that defines

a set of graphic objects

their associated attributes

and the graphic modes that affect output.

Thegraphic objects include

a pen for line drawing

a brush for painting and filling,

a bitmap for copying or scrolling parts of the screen

a palette for defining the set of available colors

a region for clipping and other operations

and a path for painting and drawing operations

Device context


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Messages and Window procedure

Input

Keyboard events

Mouse eventsOutput

GDI and devices

Bitmap

DirectX


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Window Controls

Accelerator

Bitmap

Cursor

Dialog

HTML

Icon

Menu

String Table

Tool bar


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Dialog and associated controls

Label

Edit Box

Push button

Text Box

Scroll bar (vertical, horizontal)

Drop down list etc


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Document - View architecture

Document : 13112006

View : 13-11-2006

13/11/2006

11/13/2006

11:13:2006


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DCOM architecture


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formerly known as OLEcontrols orOCXcontrols,

are components (or objects)

can be inserted into a Web page or other application

to reuse packaged functionality someone else programmed.

Also be used in applications written in many programminglanguages (including all MS programming and database

languages)

Hundreds of ActiveX controls

simple timer control

Sophisticated control like

word processor

Spread sheet

ActiveX Controls


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Based on Distributed COMDCOM Distributed Component Object Model

Scalable

Feature two way communication with the containers

4 ways to write an ActiveX control

MFC

ActiveX Template Library (ATL)

BaseCtrl framework

Visual J++ (COM objects only)

ActiveX Controls Contd


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Additional support by VC++

Support for

data base connectivity

Networking (WinSock)

TAPI

Multimedia

Client/Server

HTTP

and what not


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Support for Database connectivity (ODBC,DAO)


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THANK YOU

Introduction to Visal Programming

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