获得Memo、RichEdit的光标位置：

procedure TForm1.Button1Click(Sender: TObject);
var Row, Col : integer;
begin
  Row := SendMessage(Memo1.Handle, EM_LINEFROMCHAR, Memo1.SelStart, 0);
  Col := CustEdit.SelStart - SendMessage(Memo1.Handle, EM_LINEINDEX, -1, 0);
  Edit1.Text:=行,列:+IntToStr(Row)+,+IntToStr(Col);
end;