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[fpc] calling a proc in a binary from an injected DLL

 
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mezzo
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Joined: 08 Sep 2010
Posts: 28
PostPosted: Tue Jan 03, 2012 6:19 pm    Post subject: [fpc] calling a proc in a binary from an injected DLL Reply with quote
I use the below code from my injected DLL to make the game print a message on screen.
Code:

procedure nhwrite(texttoprint:PChar);stdcall;
var
   nhprint:^Integer;
begin
     nhprint := POINTER($004A1DD0);

     asm
        PUSH texttoprint                   //ASCII string to be printed
        CALL nhprint                //call $004A1F10 makes the game print the msg
     end;
end;


It works, but feels like an ugly hack.
Is this how it is supposed to be done ? Is there some way to 'declare' a function location in main binary from inside the DLL ?
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Dark Byte
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Joined: 09 May 2003
Posts: 25907
Location: The netherlands
PostPosted: Tue Jan 03, 2012 10:14 pm    Post subject: Reply with quote
assuming delphi mode, else place an @ in front of nhprint:=...
Code:

var
  nhprint:procedure (s: pchar); stdcall;

...
  nhprint('your message')
...

initialization
  nhprint:=pointer($004a1dd0);


instead of initialization you could put in between the begin/end in the .lpr of the library (just make sure that nhprint is declared in the interface of a unit)
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mezzo
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Joined: 08 Sep 2010
Posts: 28
PostPosted: Wed Jan 04, 2012 12:09 pm    Post subject: Reply with quote
Works great ! thanks dark byte
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