EOS и LineSeparator Properties and SkipLine Method Example (VB)

В этом примере показано, как управлять текстовыми потоками по одной строке за раз. Показан эффект изменения разделителя строк с возврата каретки по умолчанию или перевода строки (adCRLF) на простой канал строки (adLF) или возврат каретки (adCR).

'BeginSkipLineVB  
Private Sub cmdSkipLine_Click()  
    On Error GoTo ErrorHandler  
  
    'Declare variables  
    Dim i As Integer  
    Dim objStream As Stream  
    Dim strLine, strChar As String  
  
    'Instantiate and open stream  
    Set objStream = New Stream  
    objStream.Open  
  
    'Set line separator to line feed  
    objStream.LineSeparator = adLF  
  
    'Load text content of list box into stream  
    'One line at a time  
    For i = 0 To (List1.ListCount - 1)  
        objStream.WriteText List1.List(i), adWriteLine  
    Next  
  
    'Display the entire stream  
    Debug.Print "Whole Stream:"  
    objStream.Position = 0  
    Debug.Print objStream.ReadText  
  
    'Display the first line  
    Debug.Print "First Line:"  
    objStream.Position = 0  
    strLine = objStream.ReadText(adReadLine)  
    Debug.Print strLine  
    Debug.Print "Line length: " + Str(Len(strLine))  
  
    'Skip a line, then display another line  
    Debug.Print "Third Line:"  
    objStream.SkipLine  
    strLine = objStream.ReadText(adReadLine)  
    Debug.Print strLine  
    Debug.Print "Line length: " + Str(Len(strLine))  
  
    'Switch line separator to carriage return  
    'All items from list will be considered one line  
    'Assuming no CRs have been loaded into stream  
    Debug.Print "Whole Stream/First Line:"  
    objStream.Position = 0  
    objStream.LineSeparator = adCR  
    strLine = objStream.ReadText(adReadLine)  
    Debug.Print strLine  
    Debug.Print "Line length: " + Str(Len(strLine))  
    Debug.Print "Stream size: " + Str(objStream.Size)  
  
    'Use EOS to Determine End of Stream  
    Debug.Print "Character by character:"  
    objStream.Position = 0  
    Do Until objStream.EOS  
        strChar = objStream.ReadText(1)  
        Debug.Print strChar  
    Loop  
  
    ' clean up  
    objStream.Close  
    Set objStream = Nothing  
    Exit Sub  
  
ErrorHandler:  
    ' clean up  
    If Not objStream Is Nothing Then  
        If objStream.State = adStateOpen Then objStream.Close  
    End If  
    Set objStream = Nothing  
  
    If Err <> 0 Then  
        MsgBox Err.Source & "-->" & Err.Description, , "Error"  
    End If  
End Sub  
  
Private Sub Form_Load()  
    List1.AddItem "This is the first line"  
    List1.AddItem "This is the second line"  
    List1.AddItem "This is the third line"  
End Sub  
'EndSkipLineVB  

См. также:

Свойство EOS
Свойство LineSeparator (ADO)
Метод SkipLine