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Readprocessmemory?

Cheat Engine Forum Index -> General programming

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blqxxxxxxx
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Joined: 25 Aug 2009
Posts: 37

Posted: Thu Apr 01, 2010 11:16 am Post subject: Readprocessmemory?

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I want to read one address but it shows me a wrong value.
I use this

Code:

var
hProcess,HandleWindow: THandle;
Struct: TProcessEntry32;
ProcessID,temp:cardinal;
buf:pchar;
begin
HandleWindow :=FindWindow(nil,'The window title ;)');
GetWindowThreadProcessId(HandleWindow,@ProcessID);
hProcess := OpenProcess(PROCESS_ALL_ACCESS,FALSE,ProcessID);
getmem(buf,4);
readprocessmemory(hProcess,ptr($00A56AA8),buf,4,temp);
showmessage(string(buf));
freemem(buf);
if hProcess <> 0 then
CloseHandle(hProcess);
end;

and use this

Code:

showmessage(inttostr(integer(buf)));

to show me a real value. The message shows wrong value Sad

Sad

Can someone help me?

Kind regards Megaz0r

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Dark Byte
Site Admin

Reputation: 475

Joined: 09 May 2003
Posts: 25974
Location: The netherlands

Posted: Thu Apr 01, 2010 2:38 pm Post subject:

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buf is a pointer to a block of 4 bytes, so try dereferencing it first:
showmessage(inttostr(integer(buf^)));

alternatively:

Code:

var
myinteger: integer;
...
readprocessmemory(hProcess,ptr($00A56AA8),@myinteger,4,temp);

showmessage(inttostr(myinteger));

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iPromise
Grandmaster Cheater

Reputation: -1

Joined: 27 Jun 2009
Posts: 529
Location: Canada

Posted: Thu Apr 01, 2010 5:02 pm Post subject:

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Problem HERE:

Code:

hProcess,HandleWindow: THandle;

Change that to:

Code:

hProcess : THandle;
HandleWindow : HWND;

Another one:

Code:

readprocessmemory(hProcess,ptr($00A56AA8),buf,4,temp);

To:

Code:

readprocessmemory(hProcess,ptr($00A56AA8),[b]@[/b]buf, 4,temp);

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Dark Byte
Site Admin

Reputation: 475

Joined: 09 May 2003
Posts: 25974
Location: The netherlands

Posted: Thu Apr 01, 2010 7:55 pm Post subject:

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Code:

hProcess,HandleWindow: THandle;

is ok, HWND is just another name for System.THandle

Code:

readprocessmemory(hProcess,ptr($00A56AA8),@buf, 4,temp);

that is bad, and you should never do that
Using pchar to allocate a 4 byte block and then store 4 bytes in that block isn't useful, but overwriting the pointer with data is worse

freemem(buf); will then cause massive damage
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blqxxxxxxx
Cheater

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Joined: 25 Aug 2009
Posts: 37

Posted: Fri Apr 02, 2010 2:53 am Post subject:

10q DarkByte and iPromise. NOW IT WORKS

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