RichTextBox: Leer texto de cierta linea...

[seba123neo]

Hola, culd, aca te dejo una funcion con SendMessage, es la mejor forma creo, aparte es rapidisimo cuando tenes miles de lineas.

Código vb:

Option Explicit
 
Private Const EM_LINEINDEX = &HBB
Private Const EM_LINELENGTH = &HC1
Private Const EM_GETLINE = &HC4
 
Private Declare Function SendMessageLong Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lPara As Long) As Long
Private Declare Function SendMessageString Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, ByVal lPara As String) As Long
 
Private Sub Command1_Click()
   MsgBox TextoLineaRichTextBox(Richtextbox1, 58)
End Sub
 
Private Sub Form_Load()
   Dim i As Long
   For i = 0 To 100
      Richtextbox1.Text = Richtextbox1.Text & "Linea " & i & vbCrLf
   Next
End Sub
 
Private Function TextoLineaRichTextBox(ByVal pControl As RichTextBox, ByVal pLinea As Long) As String
   Dim vLongitudLinea As Long, vNumeroLinea As Long
   Dim vTemporal As String
   
   TextoLineaRichTextBox = ""
   
   vNumeroLinea = SendMessageLong(pControl.hwnd, EM_LINEINDEX, pLinea, 0&)
   vLongitudLinea = SendMessageLong(pControl.hwnd, EM_LINELENGTH, vNumeroLinea, 0&) + 1
   vTemporal = String$((vLongitudLinea + 2), 0)
   
   Mid$(vTemporal, 1, 1) = Chr$(vLongitudLinea And &HFF)
   Mid$(vTemporal, 2, 1) = Chr$(vLongitudLinea \ &H100)
   
   vLongitudLinea = SendMessageString(pControl.hwnd, EM_GETLINE, pLinea, vTemporal)
   
   If (vLongitudLinea > 0) Then
      TextoLineaRichTextBox = Left$(vTemporal, vLongitudLinea)
   End If
End Function
 

saludos.