basic controls and file handling

8/7/2019 Basic Controls And File Handling

1/56

Slide 1 of 24Session 1Ver. 1.0

GUI Applications Development Using .NET Framework

A user interface is the means by which a user interacts with

an application.

User interaction in a windows-based application is

accomplished through Windows Forms and controls.

The purpose of GUI Applications Development Using .NETFramework is to provide the student with a hands-on

environment in which they will learn the core skills of

Microsoft Windows Forms application development.

Rationale


2/56


3/56



The two ways of interacting with an application are:

By using Character User Interface (CUI)

By using Graphical User Interface (GUI)

Introducing the GUI Environment

Enter your name: John

Enter a book name: Famous Five

Sorry, The book is not available.

Do you want to check for another book (y/n):

In CUI, the user interacts with a system by keying in

commands.The following figure shows the sample output of a CUI

application.


4/56



Advantages of GUI applications are:

They are easy to learn and use.

Users need not remember the lines of syntax.

Most of the commands can be executed using the mouse.

Introducing the GUI Environment (Contd.)


5/56


6/56



Just a minute

A ____________ is a control that consists of other controls.

Answer:

Container


7/56



Windows provides the following types of dialog boxes:

Modal

System modal

Modeless

Identifying Controls of GUI Interface (Contd.)


8/56



Just a minute

Which dialog box allows users to switch to another area of

the application?

Answer:

Modeless Dialog Box


9/56



Just a minute

A __________ acts as a container for a group of related

controls.

Answer:

Dialog box


10/56



Identifying the Features of the Windows Environment

Two of the most important features of the Windows

environment that enable applications to interact effectively

with the user are:

Event-Driven Programming:

Based on users input, an event gets generated and thecorresponding code is executed.

Dynamic Linking:

Windows application is linked to the existing library functions at

run time.


11/56



The .NET offers a complete suite for developing and

deploying applications.

This suite consists of the:

.NET Products

.NET Services

.NET Framework

The .NET Framework

Microsoft has introduced Visual

Studio .NET, which is a tool fordeveloping .NET applications by

using programming languages

such as Visual Basic, Visual C#,

and Visual C++.

These products aim at allowing

developers to create numerous

applications.


12/56






.NET Products

.NET Services

.NET Framework

The .NET Framework (Contd.)

Microsoft has come up with its ownset of Web services, known as My

Services. These services are

based on the Microsoft Passport

Authentication service, which is

used in Web applications such

as Hotmail.

This service allows users to access

data by linking calendars,

phonebooks, address books, and

personal references to the passport

authentication service.


13/56






.NET Products

.NET Services

.NET Framework

The .NET Framework (Contd.)

It is the foundation on which you

design, develop, and deploy

applications.

It is a consistent and simplified

programming model that helps you

to easily uild ro ust applications.


14/56



The following figure shows the different components of the

.NET Framework.

Components of the .NET Framework

CLR is the

environment where

all programs using.NET technologies

are executed.

The CLR allows the

execution of code

across different

platforms bytranslating code into

Intermediate

Language (IL).

IL is a low-level

language that the

CLR understands.


15/56



Some of the advantages offered by the .NET Framework

are:

Consistent programming model

Multi-platform applications

Multi-language integrationAutomatic resource management

Ease of deployment

Components of the .NET Framework (Contd.)


16/56



The Visual Studio .NET IDE provides you with a common

interface for developing various kinds of applications.

The IDE also provides you with a centralized location for

designing the user interface for an application, writing code,

and compiling and debugging the application.Let us see the various components of .NET IDE.

Using Visual Studio .NET IDE


17/56



Just a minute

Which template creates a .NET Compact Framework 2.0

forms application for Pocket PC 2003 and later?

1. Windows Control Library

2. Class Library

3. Device Application4. Web Control Library

Answer:

3. Device Application


18/56



Just a minute

Which window displays messages for the status of various

features provided in the Visual Studio .NET IDE?

Answer:

The Output Window


19/56



Just a minute

Which window allows to view the resources of the servers,

such as services, processes, and the event log.

Answer:

The Server Explorer window


20/56



Navigational Features in Visual Studio .Net IDE

In addition to various windows, the Visual Studio .NET IDE

also provides three navigational features.

These are:

Docking

Tabbed NavigationAuto Hide

Let us see these navigational features in the Visual Studio

.NET IDE.


21/56



Creating Projects and Solutions

In Visual Studio .NET, an application can be made up of

several files and folders.

To organize these files and folders efficiently, Visual Studio

.NET has provided two types of containers:

ProjectsSolutions

Lets see how to create projects and solutions.


22/56



Compiling and Executing a Project

To compile and execute the application, you need to

perform the following steps:

1. Select BuildBuild Solution or press F6 to compile the

application.

2. Select DebugStart Debugging or press F5 to execute theapplication.


23/56



In this session, you learned that:

Windows provides a GUI, which enables a user to interact with

the application by using graphical components.

Windows provides three types of dialog boxes:

Modal Dialog BoxSystem Modal Dialog Box

Modeless Dialog Box

The .NET Framework consists of three main components:

Common Language Runtime (CLR)

The .NET Framework Class Library

User and Program Interfaces

Summary


24/56



The Visual Studio .NET IDE provides you with a common

interface for developing various kinds of projects for the .NET

Framework.

In Visual Studio .NET, an application can be made up of one or

more items, such as files and folders.

To organize these items efficiently, Visual Studio .NET has

provided two types of containers, projects and solutions.

In addition to various windows, the Visual Studio .NET IDE

also provides three navigational features. These are:

Docking

Tabbed NavigationAuto Hide

Summary (Contd.)


25/56



MDI (Multiple Document Interface) isa Microsoft Windows programminginterface for creating an application

that enables users to work withmultiple documents at the same time.

Each document is in a separate spacewith its own controls for scrolling. The

user can see and work with differentdocuments with the help of this MDI-Form.

MDI Form Creation:


26/56


GUI Applications Development Using .NET FrameworkExample ForMDI Form:


27/56


GUI Applications Development Using .NET FrameworkContinues


28/56


GUI Applications Development Using .NET FrameworkCode For Activating MDI Menus:

using System;

using System.ComponentModel;

using System.Drawing;

namespace MDI

{

public partial class Form1 : Form{

public Form1()

{

InitializeComponent();

}

private void menuItem2_Click(object sender, EventArgs e)

{

Form2 f = new Form2();

f.Show();

}


29/56




{

Form3 f1 = new Form3();

f1.Show();

}

private void menuItem4_Click(object sender, EventArgs e){

Form4 f = new Form4();

f.Show();

}


{

Close();

}

}

}


30/56


GUI Applications Development Using .NET FrameworkFile Handling

In this section of File Handling, we clearly

describes about the topics about

How to open a file?How to Create a File?

How to Save a File?

How to Append a File?and so on


31/56


GUI Applications Development Using .NET FrameworkOpenFileDialog:

The OpenFileDialog object interacts with theComputer's API (Application Programming Interface)to present available files to the user and retrieves the

user's file selection back to the program. This object is part of the System.Windows.Forms

library so no additional using reference will beneeded.

This dialog can be customized to show the file type,beginning directory, and the title to be displayed onthe dialog itself.


32/56




33/56



*.Structure:

openFileDialog1.ShowDialog();

*.Code For Activation:if (openFileDialog1.ShowDialog() == DialogResult.OK){

StreamReader dr = new _StreamReader(openFileDialog1.FileName);

richTextBox1.Text = dr.ReadToEnd();

dr.Close();

}


34/56


GUI Applications Development Using .NET FrameworkStreamReader:

StreamReaderis used to read data from thefiles, and display them into the correspondingcontrols.

You want to read a text file using StreamReaderfrom the System.IO namespace in the C#language and base class libraries.

By using the 'using' statement, which is idealfor this purpose, you can both perform actualfile IO and dispose of the system resources.


35/56


GUI Applications Development Using .NET FrameworkCreating A File:

First the user has to create a file by means of

type every required thing within the

appropriate control, and save everything with

the help of this SaveFileDialog control.

SavefileDialog Prompts the user to select a

location for saving a file.

Structure:

saveFileDialog1.ShowDialog();


36/56




37/56


38/56


GUI Applications Development Using .NET FrameworkFileStream Class

The FileStream class is derived from Stream

class. This class can be used for reading from

and writing to files such as bytes, characters,

strings, and other data-type values to a file.

Structure:

FileStream fileStream = new_ FileStream(@"c:\file.txt",

FileMode.Operation);


39/56


GUI Applications Development Using .NET FrameworkStreamWriter:

Implements a TextWriter for writing

characters to a stream in a particular encoding.

N

amespace:System.IO


40/56


GUI Applications Development Using .NET FrameworkAppend File:

For appending content to a text file we use the

Append Method of the File Class.

The Append methods takes in the path of thefile to which the contents to be appended as an

argument.

It opens the file in the specified path and

returns a StreamWriterobject which can be

used to append contents to the file.


41/56



*.Code For Activation:saveFileDialog1.Filter = "text files|*.txt";

if (saveFileDialog1.ShowDialog() == DialogResult.OK)

{

FileStream fs = new FileStream(saveFileDialog1.FileName,_FileMode.Append);

StreamWriter wr = new StreamWriter(fs);

wr.WriteLine(richTextBox1.Text);

wr.Close();

fs.Close();MessageBox.Show("saved");

}


42/56


GUI Applications Development Using .NET FrameworkFile Information Retrieval:

FileInfo class is used for viewing File

Information.

FileInfo class has nonstatic members Nameand Extension and Length are found in

FileInfo class.

These properties are not there in File class.


43/56




44/56



*.Code For Activation:

if (openFileDialog1.ShowDialog() == DialogResult.OK)

{

FileInfo f = new FileInfo(openFileDialog1.FileName);

MessageBox.Show("name" + "---" + f.Name + "\n" +

_"extension"+ "---" + f.Extension + "\n" + "length" +

_"----" +f.Length + "\n" + "creation time" + "---" +

_f.CreationTime);

}


45/56


GUI Applications Development Using .NET FrameworkFile:

Use ofFile class:(static members).

It must be a valid path.

The folder must be a valid folder. This File Class allow you to verify the

corresponding file is available in the given

directory or not.


46/56


GUI Applications Development Using .NET FrameworkContinuous


47/56


GUI Applications Development Using .NET FrameworkContinuous

*.Code For Activation:string s="";

if (openFileDialog1.ShowDialog() == DialogResult.OK)

{

s = openFileDialog1.FileName;

}

if (File.Exists(s) == false)

{MessageBox.Show(file not there");

FileStream ft= File.Create(s);

MessageBox.Show("file created");

ft.Close();

}

else

{MessageBox.Show("file is there");

FileStream fs = File.Open(s, FileMode.Open);

StreamReader dr = new StreamReader(fs);

richTextBox1.Text = dr.ReadToEnd();

fs.Close();

}


48/56


GUI Applications Development Using .NET FrameworkDirectory:

The Directory Class allow you to Create, drop,

and check for directories existence in the

respective path

Base Class:

System.IO

.Directory


49/56




50/56



*.Code For Activation:string z = "d:\\DEOGIRI ENGG";

if (Directory.Exists(z) == false)

{

Directory.CreateDirectory(z);File.Create(z + "\\" + "demo.txt");

MessageBox.Show("created directory on"+"---"+Directory.GetCreationTime(z));

}

else

{Directory.Delete(z);

MessageBox.Show("deleted directory");

}


51/56


GUI Applications Development Using .NET FrameworkDirectoryInfo:

This DirectoryInfo

Class is used to

show all the

subdirectoriesbelow a given

directory


52/56



*.Code For Activation:try{

DirectoryInfo d = new DirectoryInfo("d:\\");

DirectoryInfo[] z = d.GetDirectories();

foreach (DirectoryInfo y in z)

{

treeView1.Nodes.Add(y.Name);DirectoryInfo[] p = y.GetDirectories();

if (p.Count() > 0)

{

for (int i = 0; i < treeView1.Nodes.Count; i++)

treeView1.Nodes[i].Nodes.Add(y.Name);

}}

}

catch (Exception ex){

MessageBox.Show(ex.Message);

}


53/56


GUI Applications Development Using .NET FrameworkBinaryReader:

This BinaryReaderclass is used for reading the data

from a binary file.

BinaryReader is using for readprimitive types as

binary values in a specific encoding stream.

BinaryReaderObject works with Stream Objects that

provide access to the underlying bytes.

For creating a BinaryReaderO

bject , you have to firstcreate a FileStreamObject and then pass

BinaryReader to the constructor method .


54/56



*.Code For Activation:FileStream fs = new FileStream("d:\\hello\\abd.txt", FileMode.Open);

BinaryReader br = new BinaryReader(fs);

br.BaseStream.Seek(1, SeekO

rigin.Begin);while(fs.Position < fs.Length)

{

MessageBox.Show(fs.Position + "---" + fs.Length);

listBox2.Items.Add(br.ReadInt32() + "---" + br.ReadString());

fs.Position += 1;

}

fs.Close();


55/56


GUI Applications Development Using .NET FrameworkBinaryWriter:

BinaryWriter Class is used for write primitivetypes as binary values in a specific encodingstream.

C# BinaryWriterObject works with StreamObjects that provide access to the underlyingbytes.

For creating a BinaryWriterObject , you haveto first create a FileStream Object and then

pass BinaryWriter to the constructor method .


56/56


*.Code For Activation:try {

FileStream fs = new FileStream("d:\\hello\\abd.txt",FileMode.Append);

BinaryWriter br = new BinaryWriter(fs);

br.BaseStream.Seek(1, SeekOrigin.End);

int a = Convert.ToInt32(textBox1.Text);string b = textBox2.Text;

br.Write(a.ToString());

br.Write(b);

MessageBox.Show("saved data");

textBox1.Text = "";

textBox2.Text = "";

br.Close();

fs.Close();

}

catch (FileNotFoundException) {

MessageBox.Show("File is not there");

}

basic controls and file handling

Documents