Who are familiar with decompiling?
 

i mean from converting asm code(through olly) into cpp code.
is there any document\tuts?

You can find source codes of it on for example www.backerstreet.com/rec/rec.htm (for the rec decompiler) which isnt really bad tho it crashes sometimes, an ida plugin (forgot its name), the boomerang decompiler boomerang.sourceforge.net (also sometimes crashes_ several other decompilers on source forge like replimoc (never used it) and interactive decompiler (idc) which isnt half bad...
Most only deliver C code, c++ you can basically forget.

You could also use Hex-Rays IDA Pro with the x86 Decompiler plugin. It does the job good enough (usually).

How about this?

http://sourceforge.net/projects/exetoc/