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help with breakpoint, game crashing

 
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sonexa
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Joined: 19 Sep 2011
Posts: 16
PostPosted: Wed Jan 25, 2012 8:59 am    Post subject: help with breakpoint, game crashing Reply with quote
i'm newbie and, i need make a program for change EAX at breakpoint in a adress, i tryied to code, but the game always crash.

see:


Code:

procedure TForm1.Button3Click(Sender: TObject);
var
  TE32:TThreadEntry32;
  snap,tid:THandle;
  cont:TCONTEXT;
begin
  H := FindWindow(nil, 'Pinball 3D para Windows - Space Cadet');
  ThID := GetWindowThreadProcessId(H, @PID);
  PH := OpenProcess(PROCESS_ALL_ACCESS,FALSE,PID);
  snap:=CreateToolHelp32SnapShot(TH32CS_SNAPTHREAD,0);
  TE32.dwSize:=Sizeof(TThreadEntry32);
  Thread32First(snap,TE32);
  repeat
    if TE32.th32OwnerProcessID=PID then begin
      tid:=OpenThread(THREAD_ALL_ACCESS,false,TE32.th32ThreadID);
      SuspendThread(tid);
      GetThreadContext(tid,cont);
      cont.ContextFlags:=CONTEXT_FULL;
      Form1.ListBox1.Items.Add(inttostr(cont.dr0));
      cont.Dr0:=$00498348;
      cont.Dr6:=0;
      cont.Dr0:=$3;
      SetThreadContext(tid,cont);
      ResumeThread(tid);
    end;
  until Thread32Next(snap,TE32)=false;
    CloseHandle(snap);
    CloseHandle(tid);
end;
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Dark Byte
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Location: The netherlands
PostPosted: Wed Jan 25, 2012 1:24 pm    Post subject: Reply with quote
Where do you handle the breakpoint and change the register ? If you do not handle it, the game will crash

If windows debugger api: You need to use DebugActiveProcess and write a debug handler loop

If injected dll: You need to register an exception handler that deals with the exception the breakpoint causes
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