Overriding CreateDevice

[Viano]

Hi everyone,

I am trying to hook EndScene in C# but I am still far away. Project BabBot is using the approach listed at Programming Stuff: Hooking Direct3D9 with C#. and I was trying this too.

BabBot's/my approach is to start WoW as suspended and after that hook Direct3DCreate9. I am able to do this but then after overriding functions from VF table my CreateDevice() is never executed and I have no idea why.

Can anyone help on this (my code snippets from the injected DLL follow)?

Initialize VF table.

private void InitializeVFTable()
        {
            // If we don't have a real IDirect3D9 object yet then do nothing.
            if (NativeIDirect3D9 == null) return;
            
            // Save off the original VFTable (only if it really is the original).
            if (OriginalVFTable == null) OriginalVFTable = NativeIDirect3D9->VFTable;
            
            // IDirect3D9 has 17 members.
            UInt32 VFTableLength = 17;
            // Allocate space for our new VFTable.
            IntPtr* NewVFTable = (IntPtr*)Win32.Kernel32.HeapAlloc(Win32.Kernel32.GetProcessHeap(), 0, (UIntPtr)(VFTableLength * sizeof(IntPtr)));
            
            // Copy all of the original function pointers into our new VFTable.
            for (int i = 0; i < VFTableLength; i++)
            {
                NewVFTable[i] = OriginalVFTable[i];
            }
            
            // Set the Real IDirect3D9 implementation's VFTable to point at our custom one.
            NativeIDirect3D9->VFTable = NewVFTable;
        }

Override functions method. Last log I can see is "Overriding ...".

private void OverrideFunctions()
        {
            // this is the last log I can see
            HookedDLL.Hook.LoggingInterface.L("Overriding ...");
            InitializeVFTable();

            // #16: STDMETHOD(CreateDevice)(THIS_ UINT Adapter,D3DDEVTYPE DeviceType,HWND hFocusWindow,DWORD BehaviorFlags,D3DPRESENT_PARAMETERS* pPresentationParameters,IDirect3DDevice9** ppReturnedDeviceInterface) PURE;
            DelegateCreateDevice MyCD = new DelegateCreateDevice(CreateDevice);
            IntPtr PointerToMyCD = Marshal.GetFunctionPointerForDelegate(MyCD);
            NativeIDirect3D9->VFTable[16] = PointerToMyCD;
        }

This never is executed. Strangly it works for BabBot creators.

       public delegate uint DelegateCreateDevice(
            Win32.D3D9.IDirect3D9* This, uint adapter, uint deviceType, IntPtr focusWindow, uint behaviorFlags,
            IntPtr presentationParameters, Win32.D3D9.IDirect3DDevice9* deviceInterface);

        public uint CreateDevice(Win32.D3D9.IDirect3D9* This, uint adapter, uint deviceType, IntPtr focusWindow,
                                 uint behaviorFlags, IntPtr presentationParameters,
                                 Win32.D3D9.IDirect3DDevice9* deviceInterface)
        {
            // never executed
            HookedDLL.Hook.LoggingInterface.L("CreateDevice Start ...");
            
            return 1;
        }

I hope I described my problem clearly. If not just tell me what you need to know to at least try to help on this.

[Viano]

As 3 posts from this thread magicly vanished after the server downtime, I beg you all for help once more. I am able to hook Direct3DCreate9 and then create a new native IDirect3D object but fail at overriding CreateDevice() for some ****ing unknown reason. I am stuck with this over weeks now :-/

I am attaching all relevant code this time. I hope some will point me in the right direction.

Starting WoW, Injecting DLL, Resuming WoW.
C# pastebin - collaborative debugging tool

Hooking Direct3DCreate9. Everything fine in here.
C# pastebin - collaborative debugging tool

CreateDevice is never reached. This is the place where shit happens.
C# pastebin - collaborative debugging tool

Maybe it is just bad timing and CreateDevice() is executed somewhere else by WoW? Is this possible?

[ramey]

Dunno, I don't code in C#, so this is pretty alien to myself. You might want to call the original Direct3DCreate9 and then pass that to your MyDirect3D, like this:

(Don't know what C# would look like)
IDirect3D9 * pDirect3D = originalDirect3DCreate9( SDKVersion );

then pass that to your MyDirect3D or whatever it is.

return pDevice;


Also, in your CreateDevice callback or whatever you want to call it, you do Win32.D3D9.IDirect3DDevice9* deviceInterface, which I do in C++ like:

IDirect3DDevice9 ** ppReturnedDeviceInterface,

so should yours not be "Win32.D3D9.IDirect3DDevice9 ** ppDeviceInterface"?

Just bare with my, I don't know limitations of C# or anything with pointers. :>