int VtblHelper::hijack(void* pObject, int index, int newMethod)
{
  int** vtbl = (int**)pObject;
  DWORD oldProtect = 0;
  int oldMethod = (*vtbl)[index];
  VirtualProtect(*vtbl, 1024, PAGE_READWRITE, &oldProtect);
  (*vtbl)[index] = newMethod;
  VirtualProtect(*vtbl, 1024, oldProtect, &oldProtect);
  return oldMethod;
}

hook虚表