A trainer is a program written to intercept and
alter the memory addresses of games that are running
in the background. Usually trainers contain such
features as GOD MODE, UNLIMITED LIVES and others
that sometimes aren't pre-programmed into the
game by its designers.
Some people believe that creating a trainer
is extremely difficult and requires all kinds
of programming knowledge and skills. Not true.
Some very friendly tools have been created to
allow anyone to make their very own trainers for
their favorite games. In these tutorials, we'll
teach you the basics of how to get started and
give you step by step instructions on creating
trainers that you can follow along with on your
Training - GTA: San Andreas by DABhand
1. San Andreas off course :P
2. Some sorta Memory Scanner, just use Cheat Engine
it works fine
3. Time and Brains
Ok Lets get started
First of all im using the Hoodlum No-DVD it
works fine for me, some others had probs I dunno
why, but I got an original /me shrugs
So start up GTA:SA and play a bit, lets do money
first tis an easy one since you can buy things
easily to lower your amount.
Ok first off ALT+TAB out the game (best if you
press ESC to pause first), then use CE to scan
for that first value (hint: money is a dword),
then back to game and buy
something food or clothing, go back and next search
for the new value, you should have 3 values, its
the first address being shown.
Ok heres a short explanation on the debugger,
you can do a search what writes and what reads
from this address.
1. What writes, this is common for when you either
buy something, take a hit, time, etc. I.e. Use
this for searching if you want to manipulate Op
Codes that deal
with subtractions etc
2. What Reads, this is good if you get away with
it (most games will crash if you try since it
has an anti-read protection running), this is
handy if you want to
manipulate op codes that will give an effect there
and then, instead of going through buying or taking
Ok since Hoodlum were nice to remove the Read
checking, we can do that, so right click the address
after you have added it to the bottom list (double
click from left list) and select Find out what
reads from this address.
Go back to the game, unpause, move around and
get back out.
Your debugger will show a few entries, any I
suppose is handy, but always look out for float
ops, you should see this in your list.
0055BD08 FILD DWORD PTR [eax+B7CE50]
This is the one :)
So click on that, and press show in debugger
button to show the debugger screen. Remember to
take a note of the address and the opcode. Good.
Also if the opcode is more than 6 bytes long take
a note of the next Address in the list which should
be 0055BD0E. Write that down.
Now use Tsongkies Code Cave tool. (www.gamehacking.com
and under misc tools)
Type in the Window name to find a place for our
coding, (the window name is GTA: San Andreas)
Hopefully when you search it will say the address
00010ABF is recommended.
Ok now back to the debugger window and right
click and goto address, and type 10ABF.
Here is where we type our code, now the info
we know so far is the pointer [eax+B7CE50]
holds the money amount. So lets manipulate
it by forcing an amount in.
So at 10ABF, double click its line and
enter the following taking a new line for each...
fild dword ptr [eax+B7CE50]
Ok this is our code injection, what did we do,
mov [eax+B7CE50],05F5E0FF - Moves the
value 99999999 into the pointer address (05f5e0ff
is 99999999 in hex - you can use calculator in
windows in advanced mode to type the decimal value
then press hex)
fild dword ptr [eax+B7CE50] - if you read
my previous tuts on opcodes, you will know this
means move the integer value at the pointer to
the top of the stack
jmp 55BD0E - Jump back to the next instruction
in the game
Go back to 55BD08 address, and edit it
So the game jumps to our own coding :)
Go back to the game, look at that money rise
up to 99999999 :)
Ok whats next, perhaps Ammo? Sure why not.
Again get a gun, make a note of the ammo in
the gun and search for it in CE (dword again)
go back to the game and fire once (easier if your
in your house :P) and then go back and search
the next value etc.
You will find one. Now add to the list, and this
time search for what writes to the address.
Fire the gun again, back and you will see this
in the list.
007428B0 - mov [esi+08],eax
Look at it in the debugger, above you will see
the opcode at 7428AF - DEC eax
Now some of you may think to just NOP this, but
that doesnt work, cause there is a nasty test
eax,eax later on :P
So jot down from the DEC eax you should have
this (remember we need 6 bytes for our own jump)
You should have
mov eax, [esi+0c]
There is a reason why im including the dec opcode.
Which ill show why.
Anyway jot them down with the Address of dec
eax (7428AF) and also the address after the
opcodes you wrote down which is 7428B6.
Goto 10abf, the next free area to write
new code is 10AD5 (the 90 - Nop leave there)
ok at 10AD5 type the following
mov eax, 64
Basically your moving the value of 100 into
the two pointers used for ammo values in the game,
then moving 100 into the eax register. Which then
goes onto the game code and decreases eax by 1,
i.e 99 then moves it into the first pointer, then
the 2nd pointer moves back into eax.
So when you jump back to the game code, it uses
the nasty test eax,eax and the game says hey tis
cool my man!
Before we go back to the game, goto 7428AF and
put in the jmp to our own coding.
Ok go back to game and fire any gun :P Hey 99
ammo all the time wheeeeee
So hopefully from my last tut you know what
to write down on a piece of paper dont ya :)
you should have the following
||C7 80 50 CE B7 00 FF E0 F5 05
||D8 80 50 CE B7 00
||FILD DWORD PTR [EAX+B7CE50]
||E9 3A B2 54 00
|| E9 B2 4D AB FF
||C7 46 08 64 00 00 00
||C7 46 0C 64 00 00 00
||B8 64 00 00 00
||89 46 08
||8B 46 0C
||E9 C2 1D 73 00
||E9 21 E2 8C FF
You can then use TMK if you want to add these
to your own trainer :)
Other easy things you can do on your own...
1. Police Wanted stars, see if you can find it
to always stay 0 stars :P
2. Health, ahh health is always handy (this one
will take a wee bit of thought)
3. Vehicle health (easy to find in drive by's
since it shows a bar ;) )
What im not showing you it all??? Ahhh whats
the point in tutorials if you dont do some of
the work yourself, you wouldnt be doing your own
work but mine. You have to
learn somehow :P
|How does it