RECHERCHE DE CHAÎNES DANS UN FICHIER TEXTE

Public strTexte, strChaine As System.String
    
    Private Sub mnuFichierRechercher_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuFichierRechercher.Click
        Dim i, j As System.Int32
        strTexte = rctTexte.Text
        strChaine = txtLettre.Text

        For i = 0 To strTexte.Length - strChaine.Length Step 1
            If strTexte.Substring(i, strChaine.Length) = strChaine Then
                j += 1
                rctTexte.SelectionStart = i
                rctTexte.SelectionLength = strChaine.Length
                rctTexte.SelectionColor = clrChaine.Color
                rctTexte.SelectionFont = fntChaine.Font
            End If

        Next
        lblMessage.Text = j
    End Sub

    Private Sub mnuFichierReset_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuFichierReset.Click
        Dim i, j As System.Int32
        strTexte = rctTexte.Text
        strChaine = txtLettre.Text

        For i = 0 To strTexte.Length - strChaine.Length Step 1
            If strTexte.Substring(i, strChaine.Length) = strChaine Then
                j += 1
                rctTexte.SelectionStart = i
                rctTexte.SelectionLength = strChaine.Length
                rctTexte.SelectionColor = Color.Black
                rctTexte.SelectionFont = New Font("Verdana", 8, FontStyle.Regular)
            End If

        Next
        lblMessage.Text = ""
        txtLettre.Text = ""
        txtLettre.Focus()
    End Sub

    Private Sub mnuFichierOuvrir_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuFichierOuvrir.Click
        Dim strLineofText, strAllText As System.String
        ofdFichier.Filter = "Fichiers texte(*.txt)|*.txt|Fichiers ini(*.ini)|*.ini|Fichiers inf(*.inf)|*.inf|Fichiers log(*.log)|*.log"
        If ofdFichier.ShowDialog = DialogResult.OK Then
            FileOpen(1, ofdFichier.FileName, OpenMode.Input)
            Do Until EOF(1)
                strLineofText = LineInput(1)
                strAllText &= strLineofText & vbCrLf
            Loop
            rctTexte.Text = strAllText
            strTexte = rctTexte.Text
            FileClose(1)
        End If
        txtLettre.Focus()
    End Sub

    Private Sub mnuOptionsCouleur_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuOptionsCouleur.Click
        clrChaine.ShowDialog()
    End Sub

    Private Sub mnuOptionsPolice_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuOptionsPolice.Click
        fntChaine.ShowDialog()
    End Sub

    Private Sub mnuFichierEffacer_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuFichierEffacer.Click
        rctTexte.Text = ""
        txtLettre.Text = ""
    End Sub

    Private Sub mnuFichierQuitter_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles mnuFichierQuitter.Click
        Me.Close()
    End Sub