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如何实现在TextBox中如何得知Caret所在位置

10-03-30        来源:[db:作者]  
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  在form中放一个textBox两个label
  Const EM_GETSEL = &HB0
  Const EM_LINEFROMCHAR = &HC9
  Const EM_LINEINDEX = &HBB
  Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" _
  (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, _
  lParam As Any) As Long
  Public Sub GetCaretPos(ByVal hwnd5 As Long, LineNo As Long, ColNo As Long)
  Dim i As Long, j As Long
  Dim lParam As Long, wParam As Long
  Dim k As Long
  i = SendMessage(hwnd5, EM_GETSEL, wParam, lParam)
  j = i / 2 ^ 16 ’取得目前Caret所在前面有多少个byte
  LineNo = SendMessage(hwnd5, EM_LINEFROMCHAR, j, 0) ’取得前面有多少行
  LineNo = LineNo + 1
  k = SendMessage(hwnd5, EM_LINEINDEX, -1, 0)
  ’取得目前caret所在行前面有多少个byte
  ColNo = j - k + 1
  End Sub
  Private Sub Form_Load()
  Dim LineNo As Long, ColNo As Long
  Call GetCaretPos(Text1.hwnd, LineNo, ColNo)
  Label1.Caption = LineNo
  Label2.Caption = ColNo
  End Sub
  Private Sub Text1_KeyUp(KeyCode As Integer, Shift As Integer)
  Dim LineNo As Long, ColNo As Long
  Call GetCaretPos(Text1.hwnd, LineNo, ColNo)
  Label1.Caption = LineNo
  Label2.Caption = ColNo
  End Sub
  Private Sub Text1_MouseDown(Button As Integer, Shift As Integer, X As Single, Y As Single)
  Dim LineNo As Long, ColNo As Long
  Call GetCaretPos(Text1.hwnd, LineNo, ColNo)
  Label1.Caption = LineNo
  Label2.Caption = ColNo
  End Sub
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