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会计考友 发表于 2012-7-31 22:10:12

在TextBox中如何得知Caret所在位置

　　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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