Cheat Engine

[kot1990]

I just created a small program in C that creates an integer x and assigns the value 998 to it and prints its address which is 0022FF74 and the value 998. Then it waits to press a key and it prints the value of x again. This time I go to cheat engine and set the value 998 to something else. Ok, it prints the new value that I set in CE.

Here's the code of my program:

[lurc]

Your programs don't share the same virtual memory, so if you change one value in one instance, it won't change in the second instance and vice-versa.

[kot1990]

yea, I just figured this out. What I want to do is to create an application that will change the value in memory, but 0022FF74 doesn't seem to be the real memory location, because both use the same one. How can I manage the real one to change it, like CE does.

[Chaosis13]

Space is allocated when you run a program. Location x is relative to the allocated space. The absolute address is irrelevant to what you want.

So both programs use the same relative address, but the absolute address is different.

To make a program to edit the value use WriteProcessMemory(), VirtualProtectEx() also might be useful.

[kot1990]

Than you! I will try

[Slugsnack]

it is the real memory location. or at least the correct virtual one. windows gives the user the impression of thread and process concurrency which is a huge topic in itself. each program sees a usermode space for itself of 0x00000000-0x7fffffff which works by virtual memory and swapping pages in and out of various places

so if you want to change the virtual memory for one particular process, there are two ways

1 ) edit the memory from within that same process
2 ) edit it externally by some other means ( easiest is winapi )

to edit the memory from within that same process one way would be to inject a dll

second way might use something like writeprocessmemory. for that you need to specify a handle to the process which is like an identifier to the system of which process you want to edit the memory of

that is how the system knows which process' memory to edit, by the specified handle

if you're interested you can read up on concurrency, if you just want to make it work learn how to get a specific process' handle and then once you have it you can use writeprocessmemory

i wouldn't advise touching winapi until you have a good grasp of the language itself though

[Chaosis13]

I think he wants the English version. From his code he is obviously a beginner, but wants to learn. Lets not scare him away.

[kot1990]

I am a newbie and I don't know many things in languages but I am learning. Thx for all your advise

[Slugsnack]

[kot1990]

After a lot of searching I found (as you said) than every proccess has its own virtual memory and I need to target the specified proccess under windows to make changes to its memory. And I don't have to worry about absolute addresses, it seems that windows will do it for me ,, the only thing I need now is the proccess id and WriteProcessMemory. I got confused in the beggining, but CE also needs a targeted application to make changes to its memory, that helped me a lot to understand!!!! Special thanks to everyone who helped me.

[Chaosis13]

You need to do this:

[kot1990]

Well, this is my first program in C++. Till now I knew only C (types, variables, loops , pointers, structures), but it seems to be the same in C++. Now I 've got a problem with accessing the process. Look at my code:

[Chaosis13]

Prototype from MSDN:

[&Vage]

I am bored in class, so I thought I made you something quick.

[hacksign23]

this probably won't help
but try making it static?