AlliedModders - Dhooks passing int reference to detour

AlliedModders (https://forums.alliedmods.net/index.php)

- Scripting (https://forums.alliedmods.net/forumdisplay.php?f=107)

- - Dhooks passing int reference to detour (https://forums.alliedmods.net/showthread.php?t=338951)

xerox8521

08-05-2022 08:29

Dhooks passing int reference to detour

Hi,

It seems to me you cannot pass argument types to functions with dhooks that are passed by reference unless they are virtual.
Well problem is this function CServerGameClients::GetPlayerLimits I wouldn't know how to make this one virtual as you need to pass an instance of CServerGameClients which you don't have in the normal API.
So i set this up as detour but with this commit here I cannot tell dhooks that the parameters are to be passed as reference. If I just specify them as int I obviously just get garbage.

So what would be the right approach to do this?

Zynda

08-05-2022 13:47

Re: Dhooks passing int reference to detour

There's a global instance g_ServerGameClients (gameinterface.cpp) if you're on linux you can simply use the symbol name.
By the way the 'garbage' value is actually the underlying int *
nothing is stopping you from simply using LoadFromAddress/StoreToAddress on it :)

xerox8521

08-05-2022 14:23

Re: Dhooks passing int reference to detour

Well, LoadFromAddress requires the address and param.GetAddress from dhooks only works on ptr param types.
So how would I get the address?

Zynda

08-06-2022 05:08

Re: Dhooks passing int reference to detour

PHP Code:


		
			
public MRESReturn GetPlayerLimits(Address pThis, DHookParam hParams)

{

    Address a1 = hParams.Get(1);

    Address a2 = hParams.Get(2);

    Address a3 = hParams.Get(3);



    // dereference

    int v1 = LoadFromAddress(a1, NumberType_Int32);

    int v2 = LoadFromAddress(a2, NumberType_Int32);

    int v3 = LoadFromAddress(a3, NumberType_Int32);

    PrintToServer("Min [%d] Max [%d] Default [%d]", v1, v2, v3);



    StoreToAddress(a1, 1, NumberType_Int32);

    StoreToAddress(a2, 4, NumberType_Int32);

    StoreToAddress(a3, 1, NumberType_Int32);



    // Make sure the original does not get called

    return MRES_Supercede;

}

All times are GMT -4. The time now is 21:43.