How to write a org babel hook, which can manupulate result

[Feng Shu <tumashu@gmail.com>]

Hi:

I want to write a hook to menupulate org babel output,
The problem is: How can I get two points info: [pointA] and [pointB]
in my hook function?

#+begin_src R :results output raw drawer
tbl <- data.frame(a=c(1,2,3),b=c(3,2,1))
print(ascii(tbl),type="org")
#+END_SRC

#+RESULTS:
:RESULTS:
[pointA]
|   |    a |    b |
|---+------+------|
| 1 | 1.00 | 3.00 |
| 2 | 2.00 | 2.00 |
| 3 | 3.00 | 1.00 |
[pointB]
:END:



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