C++ D3D Hooking

#include "stdafx.h"
#include <Windows.h>
#include <d3d8.h>

#pragma comment (lib, "d3d8.lib")

BOOL CALLBACK Dlgproc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
void DialogLoop(HWND hWnd);

BOOL CALLBACK Dlgproc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
	switch(uMsg)
	{
		case WM_COMMAND:
			switch(LOWORD(wParam))
			{
			}
	}
	return FALSE;
}

void DialogLoop(HWND hWnd)
{
	ShowWindow(hWnd, SW_SHOW);
	MSG msg;
	while(GetMessage(&msg, hWnd, 0, 0) > 0)
	{
		TranslateMessage(&msg);
		DispatchMessage(&msg);
	}
}

int _tmain(int argc, _TCHAR* argv[])
{
	HWND hWnd = CreateDialog(NULL, MAKEINTRESOURCE(IDD_DIALOG1), NULL, (DLGPROC)Dlgproc);
	CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)DialogLoop, hWnd, 0, NULL);

	IDirect3D8 *Direct3D8 = Direct3DCreate8(D3D_SDK_VERSION);

	D3DPRESENT_PARAMETERS D3DPresentParams;
	ZeroMemory(&D3DPresentParams, sizeof(D3DPRESENT_PARAMETERS));
		D3DPresentParams.Windowed=true;
		D3DPresentParams.BackBufferCount=1;
		D3DPresentParams.BackBufferWidth=800;
		D3DPresentParams.BackBufferHeight=600;
		D3DPresentParams.BackBufferFormat=D3DFMT_X8R8G8B8;
		D3DPresentParams.SwapEffect=D3DSWAPEFFECT_DISCARD;
		D3DPresentParams.hDeviceWindow=hWnd;

	IDirect3DDevice8 *pDirect3DDevice;
	Direct3D8->CreateDevice(D3DADAPTER_DEFAULT, D3DDEVTYPE_HAL, hWnd, D3DCREATE_SOFTWARE_VERTEXPROCESSING,&D3DPresentParams, &pDirect3DDevice);

    DWORD* pVTable = (DWORD*)pDirect3DDevice;
    pVTable = (DWORD*)pVTable[0];

	DWORD EndSceneOffset = pVTable[42] - (DWORD)GetModuleHandle("d3d8.dll");

	pDirect3DDevice->BeginScene();
	pDirect3DDevice->Clear(0, 0, D3DCLEAR_TARGET, D3DCOLOR_XRGB(0, 0, 255), 0, 0);
	pDirect3DDevice->EndScene();
	pDirect3DDevice->Present(0, 0, 0, 0);

	printf("IDirect3DDevice9::EndScene Offset:\n 0x%X\n\n", EndSceneOffset);
	system("pause");

	return 0;
}