Cheat Engine

[skyw4rrior]

I ll try to explain (sry.. my english is terrible)

It assumes that I have two Processes : 1° - Notepad
2° - My Project
and my Dll.

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I Want to do something like Inject my Dll into Notepad. Then My Project Send a message to my dll inside Notepad. My dll receives the message and call the appropriate procedure that modify a value from Notepad memory (at the address especiefied as parameter in the message). Is there anyway to do this?

I looked on google for it and found many people saying that a process can't send a message to a dll. So I tryed to create a form in runtime, from my dll, when it is injected at Notepad (this way i supposedly had a window handle that receives the messages from My Project and have the same process handle of Notepad). Yes.. it created the window.. but.. it shows for some msecs and disappears! I Put a Sleep command to check if the window was really created and yes.. it was.. and after the sleep time it desapears... Can someone help me about it ? (plz.. don't say to use findwindow, openprocess, writeprocessmemory, etc.. i know it.. but I don't want to use apis)

Here is how i created the form from the initiallization of the dll:

library MyDll;
...
var frmx:tform;
...
begin
FrmX:=TForm1.Create(Application);
FrmX.Show;
FrmX.Position:=poScreenCenter;
sleep(6000); // <--- the verification
end.

[Dark Byte]

let it create a new thread (using a global variable) and in that thread create the window. (and just do FrmX.showmodal in that thread)

[XanSama]

or just use madCodeHook [www.madshi.net] and it's crazy communication methods.

[Dark Byte]

I prefer using shared memory objects and/or thread events

[skyw4rrior]

[Dark Byte]

yes thats correct and then between the begin and end of the dll add the code:

[skyw4rrior]

wow.. Ty Dark Byte.. worked fine..

Let me do just another 2 questions:
1°- I injected the dll into Notepad. My Window showed correctly. But when i close Notepad it gives an error. Why?
2° - Is there anyway to annex my window to the one of Notepad. e.g: Make my window a piece of the Notepad Window, fixed on it base for example?

[Dark Byte]

1:try writing a finalize section that gets executed when the dll unloads
in there add code that tells the window to close and terminate the tread (and wait for the thread to terminate) and then exit

2: perhaps you can make your window a child window inside the notepad window, but somehow i doubt it'll work.
(else just write code to find the main window that isn't your window and adjust your windows's size and location to it)

[skyw4rrior]

[Dark Byte]

don't call showmessage. It;s not threadsafe and certainly onot in the context of a foreign process. Use messagebox(0,'test','my app',mb_ok); instead

and use mythread.waitfor; to wait till it terminates
Oh, and MyThread isn't nil right ?
In the start of the dll have it:
MyThread:=SkyHook.create(false);

[skyw4rrior]