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caret:如何实现在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 Pu [阅读全文] [PDF]