Question regarding pointers

[Nabb]

Hello.

So I thought I had retrieved the account and password successfully, after I was told it will be stored as a pointer if it exceeds x letters. I tried this out and it showed to be true.

Base + 0x553A68 is the address for password. This is true when password is less than 16 characters (I have in mind), although when it isn't I would need a pointer to "Base + 0x553A68". The problem is that I don't know how to use the pointers in C#... I'd greatly appreciate any help received!

[Blood]

Your problem is with memory reading or pointer reading ?
Because to read a pointer just do it:


String strValue = ReadString( ReadInt( POINTER ) + OFFSET_IF_EXIST);

[Nabb]

It worked, thanks.


As stated, this pointer is null if the acc length is actually not over 16. So this was my solution:


string pass = ReadString(Tibia.Handle, ReadInt32(Tibia.Handle, base_address + password));
if (pass.Length == 0)
{
pass = ReadString(Tibia.Handle, base_address + password);
}


Does it make sense that you'd need such an approach or am I missing something? Should you really need to check both a pointer and normal address?

[ottizy]

It's stored as a std::string. If the length of the string exceeds 16 characters it will be stored in a different location in the memory, giving you a pointer instead.

The way to determine if it has been stored in a different location is to read the length value of the string which is located +0x14 bytes from the main pointer.



string pass = "";

if (ReadInt32(Tibia.Handle, base_address + password + 0x14) <= 15)
{
pass = ReadString(Tibia.Handle, base_address + password);
}
else
{
pass = ReadString(ReadInt32(Tibia.Handle, base_address + password));
}

[XtrmJash]

I've gotta ask, of all the values you could've read, why did you choose password and account name first?

[Nabb]

I am working on something requiring it. Also it was the easiest of those values that I need. I also need character name and the character list. I have retrieved character name only through client title, so I guess I'm fine. But list still no success :(


@ottizy Yeah that worked, are you sure this is a safe replacement of my code though?

[ottizy]

I am working on something requiring it. Also it was the easiest of those values that I need. I also need character name and the character list. I have retrieved character name only through client title, so I guess I'm fine. But list still no success :(


@ottizy Yeah that worked, are you sure this is a safe replacement of my code though?

Quite sure yes

[Nabb]

Alright, thanks. I'll rely on it :) I don't need this approach on account name though right? I mean account can't exceed 16 chars?

[ottizy]

Yes you will need this approach. I tested just to make sure and made a account with a 31 character account name :p

[Nabb]

Alright thanks a bunch for your effort! :D



if (ReadInt32(Tibia.Handle, base_address + password + 0x14) <= 15)


What replacement should it be for account? 0x? <= ?

[Farsa]

same thing

[Nabb]

Should this approach of checking for pointers:


if (ReadInt32(Handle, Address + 0x14) <= 15)


Be used at all times? Can I do it when looping through Character List, to know if it's a pointer value?

[Farsa]

yes, each string in the character list is a std::string that uses the so called "short string optimization" http://stackoverflow.com/questions/1466073/how-is-stdstring-implemented

[ottizy]

Some of the strings that can be found are declared as const char* I believe ( = You don't have to use the std::string approach). Like names in battlelist.