[CODE]VTable hooking

DWORD *hookVFunc(DWORD *vtable, int index, DWORD *newFunction)
{
	DWORD dwOldProt, *oldFunc;
	VirtualProtect(&vtable[index], 4, PAGE_EXECUTE_READWRITE, &dwOldProt);
	oldFunc=(DWORD*)vtable[index];
	vtable[index]=(DWORD)newFunction;
	VirtualProtect(&vtable[index], 4, dwOldProt, &dwOldProt);
	return oldFunc;
}

UINT (__stdcall *oGetAdapterCount)(void);
UINT __stdcall xGetAdapterCount(void)
{
	MessageBox(0, L"hooked", L"hook", MB_OK);
	return oGetAdapterCount();
}

int main()
{
	HANDLE hDll = LoadLibrary(L"d3d9.dll");
	IDirect3D9 *pD9 = Direct3DCreate9(D3D_SDK_VERSION);
	//the index of GetAdapterCount is 4
	oGetAdapterCount = (UINT (__stdcall *)(void))hookVFunc(*(DWORD**)pD9, 4, (DWORD*)&xGetAdapterCount);
	pD9->GetAdapterCount();
	system("pause");
	return 1;
}

oGetAdapterCount = (UINT (__stdcall *)(void))hookVFunc(*(DWORD**)pD9, 4, (DWORD*)&xGetAdapterCount);