文本框的行统计和读指定行.frm

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VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "计算TextBox的行数(不使用TextBox的消息)"
   ClientHeight    =   3120
   ClientLeft      =   60
   ClientTop       =   345
   ClientWidth     =   5895
   LinkTopic       =   "Form1"
   ScaleHeight     =   3120
   ScaleWidth      =   5895
   StartUpPosition =   3  'Windows Default
   Begin VB.CommandButton Command2 
      Caption         =   "读取第21行"
      Height          =   495
      Left            =   4320
      TabIndex        =   2
      Top             =   1080
      Width           =   1335
   End
   Begin VB.CommandButton Command1 
      Caption         =   "计算行数"
      Height          =   495
      Left            =   4320
      TabIndex        =   1
      Top             =   120
      Width           =   1335
   End
   Begin VB.TextBox Text1 
      BeginProperty Font 
         Name            =   "MS Serif"
         Size            =   12
         Charset         =   0
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   2775
      Left            =   240
      MultiLine       =   -1  'True
      ScrollBars      =   3  'Both
      TabIndex        =   0
      Text            =   "文本框的行统计和读指定行.frx":0000
      Top             =   120
      Width           =   3975
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Option Explicit

Function TextBoxLineCount(txt As TextBox) As Long
    Dim S As String, pos As Long
    
    TextBoxLineCount = 0
    pos = 1
    S = txt.Text
    Do
        TextBoxLineCount = TextBoxLineCount + 1
        pos = InStr(pos, S, vbCrLf)
        If pos > 0 Then pos = pos + 2
    Loop Until pos = 0
End Function

Function TextBoxGetLine(txt As TextBox, ByVal N As Long) As Variant
    Dim S As String, pos As Long, pos2 As Long, LineIndex As Long
    
    TextBoxGetLine = Null
    LineIndex = 0
    pos = 1
    S = txt.Text
    Do
        If LineIndex = N Then
            pos2 = InStr(pos, S, vbCrLf)
            If pos2 > 0 Then
                TextBoxGetLine = Mid(S, pos, pos2 - pos)
            Else
                TextBoxGetLine = Mid(S, pos)
            End If
        Else
            pos = InStr(pos, S, vbCrLf)
            If pos > 0 Then pos = pos + 2
        End If
        LineIndex = LineIndex + 1
    Loop Until pos = 0
End Function

Private Sub Command1_Click()
    MsgBox "行数=" & TextBoxLineCount(Text1)
End Sub

Private Sub Command2_Click()
    MsgBox TextBoxGetLine(Text1, 21), , "第21行"
End Sub