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 Forums >>  IDA Pro  >>  c++ object reversing

Topic created on: November 22, 2008 06:11 CST by qinnie .

Hi folks

First of all, thank you for this great website, I've learned many things from it!

I have a question on how to reverse a C++ object.

Lets say I have the following asm code (from IDA  Pro)

push    offset aNone_0  ; "None"
lea     ecx, [ebp+arg_0]
mov     byte ptr [ebp+var_4], 2
call    ebx ; QString::QString(char const *) ; QString::QString(char const *

In this example it is obvious that I have a QString object with "None" as string.

But what if I only get a reference of a (un) known object? What is a good way to investigate such objects in IDA Pro?

Thanks for all the answers and hints!

  cod     November 24, 2008 04:46.23 CST
You need to known how the compiler create the vtable for object..

normally vc use ECX registry for implicit pointer "this"

http://en.wikipedia.org/wiki/Virtual_table

  tHEmUTABLE     December 6, 2008 00:33.16 CST
I think you are using Qt framework, check Daniel Pistelli article "Qt Internals & Reversing" at http://ntcore.com/Files/qtrev.htm

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