TextBoxGetLineColumn – Get caret position in a multiline TextBox control

Private Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal _    hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, _    lParam As Any) As LongConst EM_LINEFROMCHAR = &HC9Const EM_LINEINDEX = &HBB' Get the line/column coordinates of a given character (both are zero-based).' If charIndex is negative, it returns the coordinates of the caretSub TextBoxGetLineColumn(tb As TextBox, ByVal charIndex As Long, line As Long, _    column As Long)    If charIndex < 0 Then charIndex = tb.SelStart    ' Get the line number.    line = SendMessage(tb.hwnd, EM_LINEFROMCHAR, charIndex, ByVal 0&)    ' Get the column number by subtracting the line's start    ' index from the caret position    column = tb.SelStart - SendMessage(tb.hwnd, EM_LINEINDEX, line, ByVal 0&)End Sub