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Dear hackers,
I am investigating on how to keep the game running when the game is not in running in foreground.
I have detoured a few WINAPI functions like:
user32 GetForegroundWindow,
user32 GetFocus and
user32 GetActiveWindow to always return HWND eflc = FindWindowA(0, "EFLC");

example:

Code:

HWND WINAPI hGetForegroundWindow(void)
{
	HWND window = oGetForegroundWindow();
	Log->Write("hGetForegroundWindow %i", window);

	HWND eflc = FindWindowA(0, "EFLC");
	Log->Write("EFLC %i", eflc);
	
	return eflc;
}

Tho this does not have the desired result, the game is still frozen when not in foreground.

Would you have some suggestions?

Thanks in advance!

would this blog be helpful?

devblog.lcpdfr(dot)com/2013/12/multiplayer-mode-taking-a-look-at-disconnects-scripting-problems/

Thanks for that link. The information there confirms what i was thinking on where to look.
I managed to kind of reach my goal, but am far from pleased with the results.
I will share with you my results.

Note: All the following information has been tested with windowed mode. This can be achieved by having the -windowed argument in the gta4.exe launch path.

Code:

//The following hooks the windowmessages. Whenever things happen in a window, the window will send messages to this function.
WNDPROC	g_gameWndProc;

g_gameWndProc = ( WNDPROC )SetWindowLongA( GAME_HWND, GWL_WNDPROC, ( LONG )WindowProc );

//The following line will unhook the windowproc(), it should go into your unhook function.
SetWindowLongA( GAME_HWND, GWL_WNDPROC, ( LONG )g_gameWndProc );

//Now in our hooked function we check for the message WM_NCACTIVATE and block it.
//You will see I will pass WM_KILLFOCUS, but you could just have returned NULL for the same result.

LRESULT CALLBACK WindowProc( HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam )
{
	if(Msg == WM_NCACTIVATE && wParam == 0)
	{
		Log->Write("WM_NCACTIVATE for hWnd %i wParam %i lParam %i", hWnd, wParam, lParam);
		
		return CallWindowProc( g_gameWndProc, hWnd, WM_KILLFOCUS, wParam, lParam );
	}

	return CallWindowProc( g_gameWndProc, hWnd, Msg, wParam, lParam );
}

After doing that, congratulations, after ALT+TAB the window stays active.
Tho there is one problem, the window holds the mouse focus and you cannot leave.
I did found the following workaround:

-If you want to keep the game running and want full interaction with another window (like your webbrowser) you should minimize GTA4 with the use of shortcut "WINDOWS KEY + KEY DOWN".
-Then it will minimize into your taskbar.
-Click GTA4 in your taskbar to show the window. The GTA4 window now has focus
-Now ALT+TAB and perform a mouseclick.

You now have GTA4 running while not interacting with the window.

I just happened to find a method that doesnt require hacking the game at all lol.
To keep GTA4 active (I tested this with EFLC in windowed mode) do the following.
-Get ingame
-Press WINDOWS KEY (now your startmenu opens and your mouse pointer is invisible)
-Quickly move your mouse down to your taskbar and click a running task while moving the mouse. (you might need to retry a few times)

I know this is not the most comfortable method but it doesnt involve any code changes.

cool shit here

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