Calling lua functions requiering an hardware event

[Frosttall]

Hello,

today I tried to add the aspect of auction house to my bot, but I encountered a problem I haven't had before with my method to call lua functions. As you know do some functions like 'CreateAuction' require a hardware event and my first approach was writing the PerformanceCounter to LastHardwareEvent (aka anti-afk) aswell as moving the value into LastHardwareAction via asm directly before calling the lua functions (Tried it with every single function GetTop, LoadBuffer, PCall and ToLString), but I still receive the following message:

Warning: AddOn XXX attempted to call a protected function (UNKNOWN()) which may require interaction.

Which steps do you all take to be able to call functions which require a hardware event?

[CrimeTime]

maybe should you look how the auctionhouse addons handle this problem.

[Frosttall]

maybe should you look how the auctionhouse addons handle this problem.

I did that already, but it's only a regular OnClick eventhandler.

function AuctionsCreateAuctionButton_OnClick()
    LAST_ITEM_START_BID = MoneyInputFrame_GetCopper(StartPrice);
    LAST_ITEM_BUYOUT = MoneyInputFrame_GetCopper(BuyoutPrice);
    DropCursorMoney();
    PlaySound("LOOTWINDOWCOINSOUND");
    local startPrice = MoneyInputFrame_GetCopper(StartPrice);
    local buyoutPrice = MoneyInputFrame_GetCopper(BuyoutPrice);
    if ( AuctionFrameAuctions.priceType == PRICE_TYPE_UNIT ) then
        startPrice = startPrice * AuctionsStackSizeEntry:GetNumber();
        buyoutPrice = buyoutPrice * AuctionsStackSizeEntry:GetNumber();
    end
    StartAuction(startPrice, buyoutPrice, AuctionFrameAuctions.duration, AuctionsStackSizeEntry:GetNumber(), AuctionsNumStacksEntry:GetNumber());
end

[CrimeTime]

Look at StartAuction - World of Warcraft Programming: A Guide and Reference for Creating WoW Addons
there is an example how to use it and I think, if you do it on this way, you won't need any hardwareaction or something else.

[Frosttall]

I've succeeeded after many hours of try&error: Script_StartAuction makes a call to CGGameUI::CanPerformAction( whereas '8' is an id specifing the current action.

The following solution will only work for a few methods and will not unlock completly locked function like moving. This method simulates the KeyDown-Flag which is set when you press a button (mouse or keyboard).

summa sumarum: Writing '1' to the following address will allow to call StartAuction without error:

        internal enum BlockedActionUnlockOffsets : uint
        {
            Ptr = 0xCC9EF4,
            Offset = 4704
        }

Usage:

            var unlockPtr = WowMem.ReadRebased<uint>(MemEnums.BlockedActionUnlockOffsets.Ptr);
            if (unlockPtr != 0)
                unlockPtr += (uint)MemEnums.BlockedActionUnlockOffsets.Offset;
            //The lua pointer isn't always initialized. Take care of it!

                        if (unlockPtr != 0)
                        {
                            WowMem.Write(unlockPtr, 1);
                        }

[Master674]

I've succeeeded after many hours of try&error: Script_StartAuction makes a call to CGGameUI::CanPerformAction( whereas '8' is an id specifing the current action.

The following solution will only work for a few methods and will not unlock completly locked function like moving. This method simulates the KeyDown-Flag which is set when you press a button (mouse or keyboard).

summa sumarum: Writing '1' to the following address will allow to call StartAuction without error:

        internal enum BlockedActionUnlockOffsets : uint
        {
            Ptr = 0xCC9EF4,
            Offset = 4704
        }

Usage:

            var unlockPtr = WowMem.ReadRebased<uint>(MemEnums.BlockedActionUnlockOffsets.Ptr);
            if (unlockPtr != 0)
                unlockPtr += (uint)MemEnums.BlockedActionUnlockOffsets.Offset;
            //The lua pointer isn't always initialized. Take care of it!

                        if (unlockPtr != 0)
                        {
                            WowMem.Write(unlockPtr, 1);
                        }

Patch

mov eax,1
ret args*4

to CanPerformAction and hook scan memcpy?

[Frosttall]

Patch

mov eax,1
ret args*4

to CanPerformAction and hook scan memcpy?

Thought about that, but patching is no option for me :/

[Master674]

Thought about that, but patching is no option for me :/

Put a breakpoint on it? You can achieve it without modifying a single byte... ^^

[Frosttall]

Put a breakpoint on it? You can achieve it without modifying a single byte... ^^

Breakpoints are easily detectable. Well, that wouldn't matter for a private project, but I can't consider this as an option if I ever plan to distribute it.

[Master674]

Breakpoints are easily detectable. Well, that wouldn't matter for a private project, but I can't consider this as an option if I ever plan to distribute it.

Depends on how you do it. If you love overhead VirtualProtect and a VEH (there are no good ways of detecting those because _LdrpVectorHandlerList is not exported) / Singlestepping through the code.

[Cypher]

Depends on how you do it. If you love overhead VirtualProtect and a VEH (there are no good ways of detecting those because _LdrpVectorHandlerList is not exported) / Singlestepping through the code.

_LdrpVectorHandlerList may not be exported, but have you ever looked at what the return value of AddVectoredExceptionHandler REALLY is? (Hint: It's not just a void* to garbage )