Presentations on the delphi programming language. Presentation on the topic "Basics of working in the Delphi environment"

The code editor window (Unit1.pas) creates the source text of the module of the application being developed. Each editable file is on a separate page, which can be accessed by clicking on its tab. The form designer window (Form1) is where the form is designed. Why are the necessary elements placed on the form from the Component Palette? The Object Inspector window displays the object properties and events for the current Form1. It can be displayed using the View/Object Inspector command or by pressing a key. The Object Inspector window has 2 tabs: Properties and Events. Form Designer Window Code Editor Window Object Inspector Window

Dpr Main project file!!.Dfm Shape file!!.Pas Pascal module file!!.Res Resource files!(created on first save).Opt Project parameters file.~* Backup files.Dcr Delphi Component Resource !.Dcu Compiled module file.Dsm Intermediate code.Dll Dynamic library files.Dsk Workspace configuration.Exe Executable files File extensions Required files for the application to run

Example of a simple application Creating a new application begins with Delphi automatically offering an empty window - Form1. The application interface consists of components that you can select from the Component Palette, place them on the form, and change their properties. Selecting a component in the Palette is done by clicking on the desired component, for example, a Button, and then clicking on the form. The selected component will appear on it. After placing the component on the form, Delphi automatically makes changes to the module file, i.e. the line is added: The appearance of the component is determined by its properties, which are available in the Object Inspector window when the component is selected on the form.

The Object Inspector window displays the names of all properties and their values. Properties are attributes that define how components display and function when the application runs. You can change property values ​​directly in the Inspector, and the corresponding component is immediately changed. Let's give our button a different title: write in the line Caption - About Form Some properties of the Button: Cursor:TCursor - mouse image when hovering over the button (for example: crHandPoint) Default:Boolean - the button is pressed using the Enter key, if the value Default=True Font: TFont - font Height:Integer - button height in pixels Width:Integer - button width in pixels Left:Integer - horizontal coordinate of the upper left corner. Top:Integer - vertical coordinate of the upper left corner.

In order for a button to respond to any event, you must specify an event handling procedure that will be called when this event occurs. To do this, double-click in the OnClick event area (or double-click on the About Form button), as a result Delphi automatically creates a handler procedure template in the form module. var About: Tabout; begin About:=TAbout.Create(self); About.Show; end; Now, when you click on the About Form button, another form called About will appear, which we will describe in the Unit2 module. Let's write it in the procedure

Let's describe the second form in Unit2.pas. In the main menu, select the item File / New / Form. Set this form to Caption and Name - About. Place a Button on the form with the title Close and a Label component, which is simple text that is not edited when the program is executed. The text is entered in the Caption field. Some properties of Label AutoSize:Boolean - automatic correction of the Label size, depending on the text of the label. Aligment: TАligment - the method of text alignment inside the component, can take the following values: - taLeftJustify - left alignment - taCenter - text centering - taRightJustify - right alignment edge WordWrap:Boolean - automatic wrapping of words to another line Transparent:Boolean - transparent or filled inscription. The shading color is set by the Color property. Label

When you click the Close button, we will make the About form close. procedure TAbout.Button1Click(Sender: TObject); begin Close; end; Our Unit2 module looks like When you click the About Form button of the first form, the second form is displayed on the screen, which was previously invisible. Because From the Unit1 module the operation with the second form is carried out, then in the implementation section of the Unit1 module we will place the code uses Unit2. Or File/Use Unit…

In order to save the project, in the main menu, select the item File / Save Project As... Saving the project Let's give our project the name Project1 The compilation process is started using the command: Project / Compile Compiling the project to obtain an application can be performed at any stage of project development. This is useful for checking the appearance and correct functioning of individual form components, as well as for checking the generated code. Once the project is compiled, an application executable file is created with the name of the project file. Compilation

Launching a project You can run a project from the Delphi environment and from the Windows environment. From the Delphi environment it is carried out using the Run / Run command or by pressing the key. Note You cannot run a second copy of the application while the application is already running. You can continue developing the project only after the application is completed. When an application loops (freezes), it must be terminated using Delphi using the Run / Program Reset command or by pressing the + keys

Municipal educational institution

Secondary school No. 1

With. Obsharovki

DELPHI. Introduction to the programming system

Development by computer science teacher Vyacheslav Aleksandrovich Maksimov.

Delphi. Main characteristics of the product.

Delphi is a combination of several important technologies:

• High-performance compiler to machine code

• Object-oriented component model

• Visual (and, therefore, high-speed) construction of applications from software prototypes
• Scalable tools for building databases

Object-oriented model of software components

The main focus of this model is Delphi is done to maximize code reuse. This allows developers to build applications very quickly from pre-prepared objects, and also gives them the ability to create their own objects for the environment Delphi. There are no restrictions on the types of objects that developers can create. Indeed, everything in Delphi is written in the same language, so developers have access to the same objects and tools that were used to create the development environment. As a result, there is no difference between the objects supplied by Borland or third parties and the objects you can create.

Rapid development of a working application from prototypes

The Rendzu game program was assembled from ready-made pieces in a working day, with most of the time devoted to preening and embellishment.

Application development

Screen Saver in the form of a jumping clock was also made at Delphi in a very short time. Now this watch adorns almost every IBM-compatible machine

Who is Delphi for?

First of all Delphi designed for professional developers of corporate information systems

Delphi is intended not only for professional programmers.

Apply Delphi teachers, doctors, university professors, businessmen, all those who use a computer for a purely applied purpose.

Library of visual components

This object library includes standard user interface objects, data management objects, graphics objects, media objects, dialog and file management objects, DDE and OLE management.

Delphi: a customizable development environment

palette component .

Components are grouped on palette pages by their functions. For example, the components that represent Windows "common dialogs" are all located on a palette page called "Dialogs". .

Delphi allows developers to customize the environment for maximum convenience. You can easily change the component palette, toolbar, and also customize syntax highlighting.

Note that in Delphi you can define your group of components and place it on the palette page, and if the need arises, rearrange components or remove unused ones.

From this palette

component

you can choose

components,

from which you can

build applications.

Components include

into ourselves as visual,

and logical components.

After launch Delphi

in the top window

horizontally

icons are located

component palettes.

If the cursor

delayed for

one of the icons,

under her in

yellow rectangle

a hint appears

palette page called “Dialogs”

Smart Editor

Editing programs can be done using recording and executing macros, working with text blocks, customizable key combinations and color highlighting of lines.

Object Inspector

This tool is a separate window where you can set the values ​​of properties and events of objects (Properties & Events) during program design.

Project Manager.

Allows the developer to view all modules in the corresponding project and provides a convenient mechanism for project management. The Project Manager shows file names, time/date of selected forms, etc. You can immediately get to the text or form by simply clicking on the corresponding name.

Object navigator

Shows

library

available objects

Implements

navigation

according to you

application.

You can see

hierarchy

objects,

precompiled

modules in the library,

list of global

names of your code.

Database application development

Delphi allows

use

library of visual

component for fast

creating reliable applications,

which are easily expandable

to applications with architecture

client-server.

In other words, you can create an application

working with a local InterBase server,

and then use the created application,

connecting to a remote SQL server via SQL-Links.

Delphi is primarily a development environment based

on using the component.

So you can add completely new components

to the component palette.

You can create components internally Delphi ,

or introduce components created as controls

VBX or OLE 2.0, or you can use components

written in C or C++ as dll.

Hardware and software requirements

Windows 3.1 and higher

27 Mb of disk space for minimum configuration

50 Mb of disk space for normal configuration

processor 80386, or better 80486

• . Many developers around the world are already firmly focused on using Delphi as a tool that allows you to create highly efficient client-server applications. Moreover, the list of ready-made, professionally executed applications is so large that it is not possible to list it completely in this presentation. Range developed using Delphi software products are also amazing - from gaming programs to the most powerful banking systems.

• DELPHI. Subtleties of programming. Vasily Kucherenko.- M: “Educational book plus”, 2000, -192 p.
• Let's study DELPHI. A. Zhukov. PETER. 2002.

Slide 2

1. Basics of working in the Delphi environment. Topic outline:

1. Stages of software development. 2. The concept of a visual development environment. 3. Basic principles of object-oriented programming (OOP). 4. Screen view in the Delphi environment, the purpose of the main elements of the environment interface, the operating procedure. 5.Components Edit (Editor), Label (Inscription), Button (Button). 6. Basics of the Pascal programming language. 7. Organization of data input/output. An example of creating a simple application.

Slide 3

1. Stages of software development.

Statement of the problem. Construction of a mathematical model. Development of algorithms and work scenarios. Selecting a development environment. User interface design. Writing event handlers (procedures) and functions in program modules. Debugging and testing. Implementation, operation and modification.

Slide 4

2. The concept of a visual development environment.

Delphi is a visual environment for software development. The visual environment allows you to see and design the appearance of the program being created (interface) already at the development stage. The visual environment is built on OOP principles. To write program text in Delphi, the Object Pascal programming language is used.

Slide 5

3. Basic principles of OOP.

The main concept in OOP is an object. Object formula: Object = Data + Programs An object contains data and programs for processing this data. Objects are the building blocks for creating programs.

Slide 6

Each object has a set of properties and methods. A property is some characteristic of an object (color, size, position, etc.). Properties can take values ​​and participate in expressions. A method is the “ability” of an object to perform various operations (paint, enlarge, change, etc.), i.e. subroutines.

Slide 7

Each object has its own name. Form of accessing the properties and methods of an object: Object_name.Name of property_or_method Example of accessing a property: Button1.Color:= Green; An example of calling a method: Button1.Paint(Green);

Slide 8

3. Basic principles of OOP:

1. Encapsulation – the ability to combine data and operations into one. 2. Inheritance – the ability to create new derived classes based on existing ones. 3. Polymorphism – the ability to modify methods in derived classes.

Slide 9

4. Screen view in the Delphi environment, the purpose of the main elements of the environment interface, the operating procedure.

Launch the Delphi environment. Show the main elements of the Delphi environment interface: - Title bar, menu; - Toolbar; - Start window; - Palette of components; - “Object Inspector” window; - Form; - “Text Editor” window; - Other windows and panels may be displayed.

Slide 10

The component palette is a “warehouse” of Delphi components and consists of many sections (pages). A component is an object built into the Delphi environment.

Slide 11

In the Object Inspector window, the Properties page displays the properties of the active (selected) component and can be changed.

Slide 12

The Events page displays a list of events that can occur on the component and the handlers assigned to them. An event handler is a procedure written in Object Pascal.

Slide 13

The form is the basis of the application being created, the main object. Components are installed on it.

Slide 14

Basic properties of the form: Caption – title of the form. Color – color of the form. Width, Height – width, height in pixels. Left, Top – coordinate of the upper left corner. The properties Color, Width, Height, Left, Top are available for almost all visual components.

Slide 15

In the “Text Editor” window, the texts of program modules are displayed and edited:

Slide 16

5. Components Edit (Editor), Label (Inscription), Button (Button).

The Edit component allows you to display and edit (if enabled) a row of data.

Slide 17

Basic properties of the Edit component: Text – contains the displayed data string. Font – properties (parameters) of the line font. ReadOnly – if True, then the line cannot be edited. Name – program identifier (designation) of the component; all components have this property.

programming using one of the most common rapid application development systems - Delphi Using this training course, you can independently master the basics of object-oriented programming in Delphi. To expand your knowledge, a number of tutorials and reference books on Delphi are attached to the course. The series contains 13 presentations: OOP in Delphi – 1: Introduction to the Borland Delphi programming system. Objects (components) and their properties and OOP methods in Delphi – 2: The first program in Delphi, saving and compiling OOP in Delphi – 3: Programmatically changing the properties of OOP objects in Delphi – 4: Conditions in Delphi. Creating a simple OOP test in Delphi - 5: Elements of input and output of information. Exception handling OOP in Delphi – 6: Program screensaver and timer element OOP in Delphi – 7: Programming your toy OOP in Delphi – 8: Program menu, status bar, dialogs OOP in Delphi – 9: Creating your own OOP text editor in Delphi – 10 : Databases in Delphi OOP in Delphi – 11: Calculator in Delphi. Handling exceptional situations OOP in Delphi – 12: Creating an OOP testing system in Delphi – 13: Graphics in Delphi.

Delphi uses the Pascal Object programming language, so it is better to first learn regular Pascal and work in TurboPascal, and then move on to Delphi - it will be very easy to switch, because the syntax of the language remains unchanged. It is advisable to study OOP in Delphi in senior specialized classes - the number of hours allocated to computer science there is quite enough to master the basics of OOP in Delphi

The series of presentations “OOP in Delphi” is dedicated to object-oriented programming with
using one of the most common rapid application development systems - Delphi
Using this training course, you can independently master the basics of object-based
oriented programming in Delphi. To expand your knowledge, attached to the course
a number of tutorials and reference books on Delphi
The series contains 13 presentations:
OOP in Delphi – 1: Introduction to the Borland Delphi programming system. Objects
(components) and their properties and methods
OOP in Delphi – 2: First Delphi program, saving and compiling
OOP in Delphi - 3: Programmatically changing object properties
OOP in Delphi - 4: Conditions in Delphi. Creating a Simple Test
OOP in Delphi – 5: Elements of information input and output. Exception Handling
OOP in Delphi – 6: Program splash screen and timer element
OOP in Delphi – 7: Programming your toy
OOP in Delphi – 8: Program menu, dialogs
OOP in Delphi – 9: Creating your own text editor
OOP in Delphi – 10: Databases in Delphi
OOP in Delphi – 11: Calculator in Delphi. Exception Handling
OOP in Delphi – 12: Creating a testing system
OOP in Delphi – 13: Graphics in Delphi
Delphi uses the Pascal Object programming language, so it is better to first learn regular Pascal and work in Turbo Pascal, and then
and switching to Delphi - it will be very easy to switch, because the syntax of the language remains unchanged.
It is advisable to study OOP in Delphi in senior specialized classes - the number of hours allocated to computer science there is quite
enough to master the basics of OOP in Delphi