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 TextHwnd 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
'首先向文本框传递EM_GETSEL消息以获取从起始位置到
'光标所在位置的字符数
I = SendMessage(TextHwnd, EM_GETSEL, wParam, lParam)
j = I / 2 ^ 16