和微软一模一样的记事本的源代码（2）

Public Sub Command1_Click()
Dim FoundPos As Integer
If Fstring = "" Then
    Fstring = Text1.Text
Else
    If Text1.Text <> Fstring And Text1.Text <> "" Then
    Fstring = Text1.Text
    End If
   
End If

If Option1.Value = True Then
    EndPos = Form1.Text1.SelStart
    Form1.Text1.SelStart = 0
    StartPos = 0
    Do While FoundPos <> -1
        If Check1.Value = 1 Then
        FoundPos = Form1.Text1.Find(Fstring, StartPos, EndPos, 4)
            If FoundPos <> -1 Then StartPos = FoundPos + Len(Fstring)
        Else
        FoundPos = Form1.Text1.Find(Fstring, StartPos, EndPos)
            If FoundPos <> -1 Then StartPos = FoundPos + Len(Fstring)
        End If
    Loop
    If StartPos = 0 Then
       ' StartPos = StartPos - Len(Fstring)
          
   ' Else
       MsgBox "find   not   " + Chr(34) + Fstring + Chr(34)
    End If
Else
    StartPos = Form1.Text1.SelStart + Form1.Text1.SelLength
    EndPos = Len(Form1.Text1)
    If Check1.Value = 1 Then
        FoundPos = Form1.Text1.Find(Fstring, StartPos, EndPos, 4)
   
    Else
        FoundPos = Form1.Text1.Find(Fstring, StartPos, EndPos)
    End If
    If FoundPos <> -1 Then
        StartPos = FoundPos + 1
    Else
        MsgBox "find   not   " + Chr(34) + Fstring + Chr(34)
    End If
End If

End Sub

Private Sub Command2_Click()
Form2.Visible = False
End Sub

Private Sub Form_Load()
Command1.Enabled = False
Tchange = False
EndPos = LenB(Form1.Text1)
End Sub

Private Sub Text1_Change()

If Text1.Text <> "" Then
    Command1.Enabled = True
Else
    Command1.Enabled = False
   
End If
Tchange = True

End Sub