如何实现在TextBox中如何得知Caret所在位置

    技术2022-05-11  101

     

    '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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