How to modify an imported function of dll file to exported function?

Question

0.00/5 (No votes)

See more: (untagged)

I want to modify an imported function of dll file to exported function, please help me to do this, I want to use OllyDbg to modify it, which factor of imported function can do this (edit to exported function)? Thanks.

Posted 14-Mar-11 15:22pm

Andrewpeter

Add a Solution

1 solution

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Sergey Alexandrovich Kryukov · Answer 1 · 2011-03-14T15:32:00

Solution 1

Modify?! Wow! Listen to yourself properly to understand that it makes no sense. If you import a function F from A into B, the code does not physically exist in B. What are you going to modify?

Now, the purpose of having anything exported from B is always having F called somewhere else, let's say, in C. So, consider 1) linking A in C directly and calling F in C, 2) creating a "thunk" function F' in B, linking and calling F' in C. As F is visible in B because A is linked to B, F' should simply call F with the same very parameters and transparently return the call to the caller of F'.

—SA

Posted 14-Mar-11 15:32pm

Sergey Alexandrovich Kryukov

Updated 14-Mar-11 15:35pm

v4

Comments

Espen Harlinn 15-Mar-11 12:05pm

Ahh, a 5 - but did you seriously expect OP to get it?

Sergey Alexandrovich Kryukov 15-Mar-11 13:04pm

Yes, sure. OP has enough fantasy as he thought of modification of something in DLL.
It's only A, B, C.
--SA

Sergey Alexandrovich Kryukov 15-Mar-11 13:05pm

Andrew,

As some working people express concern about your understanding of this :-), but I bet you get it, I would like to emphasize that you're quite welcome to ask follow-up questions.
:-) :-)
--SA