1/31 5/6/2014 bazele progrmarii pe obiecte proiecte in visual basic conf univ dr botezatu cezar...

1/31 5/6/2014

BAZELE PROGRMARII PE OBIECTEPROIECTE IN VISUAL BASIC

Conf univ dr Botezatu Cezar

INFORMATICĂ MANAGERIALĂ Anul I. STUDII DE LICENŢĂ

EXERCITIUL 1

Să se proiecteze şi să se realizeze o aplicaţie care să permită analiza unui text introdus de la tastatură, afişarea primului cuvânt şi apoi la cerere a următoarelor cuvinte din text. Să se afişeze deasemenea numărul de caractere din text.

EXERCITIUL 1Rezolvare: Definim o formă

EXERCITIUL 1

Public Class Form1 Dim cuv As String Dim lung As Integer Dim i1 As Integer Dim i As Integer Dim a As IntegerDim texta as string

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click End End Sub Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Text = LTrim(Me.TextBox1.Text)lung = Len(Text)

EXERCITIUL 1

EXERCITIUL 1

Me.TextBox3.Text = Len(Text) a = InStr(Text, " ") i = 1 cuv = Mid(Text, i, a) Me.TextBox2.Text = cuv i = i+aMe.Button1.Enable=FALSEEnd Sub

EXERCITIU Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.ClickText = LTrim(Me.TextBox1.Text)iF I >0 thenI1=IElse i1=1endif a = InStr(Text, " ") If i1< lung - a Then a = InStr(Mid(Text, i1 + 1, lung – i1), " ") cuv = Mid(Text, i1, a) Me.TextBox2.Text = cuv Me.Refresh() i 1= i1 + a Else cuv = Mid(Text, i1, a) Me.TextBox2.Text = cuv Me.Refresh() End If End SubEnd Class

EXERCITIUL 1Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click a = InStr(Text, " ") If i < lung - a Then a = InStr(Mid(Text, i + 1, lung - i), " ") cuv = Mid(Text, i, a) Me.TextBox2.Text = cuv Me.Refresh() i = i + a Else

EXERCITIUL 1

Else cuv = Mid(Text, i, a) Me.TextBox2.Text = cuv Me.Refresh() End If End SubEnd Class

EXERCITIUL 1

Rezultatul:

EXERCITIUL 2

. Să se realizeze un editor de texte, care să permită introducerea unui text de la tastatură şi apoi salvarea lui pe disc prin intermediul unei ferestre de dialog. Editorul trebuie să permită şi deschiderea unui fişier existent în vederea editării.Rezolvare: Definim trei forme:• Forma de lucru”Editor de texte”;• Forma OPEN• Forma SAVE

EXERCITIUL 2EDITOR DE TEXTE

EXERCITIUL 2

Forma OPEN

EXERCITIUL 2Forma SAVE

EXERCITIUL 2

Codul sursă aferent primei forme: Imports System Imports System.IO Public Class Form1 Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click End End Sub

EXERCITIUL 2

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System. EventArgs) Handles Button3.Click TextBox1.Text = "" End Sub Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System. EventArgs) Handles Button1.Click Form2.Show() Form2.TextBox1.Text = "" Form2.TextBox2.Text = ""

EXERCITIUL 2

On Error Resume Next : Me.Hide() End Sub Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System. EventArgs) Handles Button2.Click Form3.Show() Me.Hide() End SubEnd Class

EXERCITIUL 2

Codul sursă aferent formei a II-a:Imports SystemImports System.IO Public Class Form2 Private Sub DriveListBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DriveListBox1.SelectedIndexChanged

Forma OPEN

EX 2 / OPEN

Try DirListBox1.Path=DriveListBox1.Drive CatchEnd Try TextBox1.Text = DirListBox1.Text End Sub Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System. EventArgs) Handles Button2.Click Form1.Show() Me.Hide() End Sub

PrivateSubDirListBox1_SelectedIndex Changed(ByVal sender As System. Object, ByVal e As System.EventArgs) Handles DirListBox1.SelectedIndex Changed TryFileListBox1.Path =DirListBox1.Path Catch End TryTextBox1.Text = DirListBox1.Text End Sub

EX 2 / OPEN

EX 2 / OPEN

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Me.TextBox1.Text =Me.TextBox1.Text & Me.TextBox2.Text & Me.FileListBox1. SelectedItem Try Using fisier As StreamReader = New StreamReader(Me.TextBox1.Text) Dim linie As String

EX 2 / OPENPrivate Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click Me.TextBox1.Text = Me.TextBox1.Text & Me.TextBox2.Text & Me.FileListBox1.SelectedItem Try Using fisier As StreamReader = New StreamReader(Me.TextBox1.Text) Dim linie As String Do linie = fisier.ReadLine() Form1.TextBox1.Text = Form1.TextBox1.Text & linie Loop Until linie Is Nothing fisier.Close() End Using Catch End Try Form1.Show() Me.Hide() End Sub Private Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load TextBox2.Text = "" TextBox1.Text = "" Me.DirListBox1.Refresh() Me.FileListBox1.Refresh() Me.DriveListBox1.Refresh() End Sub Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged FileListBox1.Pattern = Me.ComboBox1.Text End SubEnd Class

EX 2 / OPEN

linie = fisier.ReadLine() Form1.TextBox1.Text = Form1.TextBox1. Text & linie Loop Until linie Is Nothing fisier.Close() End Using Catch End Try Form1.Show() Me.Hide() End Sub

EX 2 / OPENPrivate Sub Form2_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load TextBox2.Text = "" TextBox1.Text = "" Me.DirListBox1.Refresh() Me.FileListBox1.Refresh() Me.DriveListBox1.Refresh() End Sub

EX 2 / OPEN

Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged FileListBox1.Pattern = Me.ComboBox1.Text End SubEnd Class

EX 2 / SAVE

Codul aferent formei a treia se prezintă astfel:Imports SystemImports System.IO Public Class Form3 Private Sub DriveListBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DriveListBox1.SelectedIndexChanged

EX 2 / SAVETry DirListBox1.Path = DriveListBox1.Drive Catch End Try TextBox2.Text = DirListBox1.Text End Sub Private Sub DirListBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles DirListBox1.SelectedIndexChanged

EX 2 / SAVE

Try FileListBox1.Path = DirListBox1.Path Catch End Try TextBox3.Text = Me.TextBox3.Text & Me.DirListBox1.SelectedItem & "\" End Sub Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles

EX 2 / SAVEComboBox1.SelectedIndexChanged FileListBox1.Pattern = Me.ComboBox1. Text End Sub Private Sub Form3_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load TextBox1.Text = "" TextBox2.Text = "" TextBox3.Text = "" End Sub

EX 2 / SAVE Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System. EventArgs) Handles Button2.Click Form1.Show() Me.Hide() End Sub Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click TextBox1.Focus()

EX 2 / SAVEIf TextBox1.Text = "" Then MessageBox.Show("Nu ati introdus numele fisierului!!!", "Atentie", Message BoxButtons.OK, MessageBoxIcon.Warning) Else TextBox4.Text = Me.TextBox2.Text & TextBox3.Text & TextBox1.Text Using fisier As StreamWriter = New StreamWriter(TextBox4.Text)fisier.WriteLine(Form1.TextBox1.Text) fisier.WriteLine(DateTime.Now)

EX 2 / SAVE

fisier.Close() MessageBox.Show("Fisierul a fost salvat in " & Me.TextBox4.Text, "Save", Message BoxButtons.OK,MessageBoxIcon.Question) End Using End If End SubEnd Class

END