// Hook window
  void WindowMgr::HookWindow(CWindow Window)
  {
    // Get window procedure
    // Note: Can't use CWindow::GetWindowLongPtr because we need to 
    // explicitly call both the ANSI and Unicode version of the function.
    WNDPROC WndProcA = reinterpret_cast<WNDPROC>(GetWindowLongPtrA(Window, 
      GWLP_WNDPROC));
    WNDPROC WndProcW = reinterpret_cast<WNDPROC>(GetWindowLongPtrW(Window, 
      GWLP_WNDPROC));

    // Debug output
    std::wcout << boost::wformat(L"WindowMgr::HookWindow: WndProcA = %p, "
      L"WndProcW = %p.") %WndProcA %WndProcW << std::endl;

    // Real window procedure
    WNDPROC WndProc = nullptr;

    // Check if WndProc pointer is a valid pointer or a special handle
    if (WndProcW && HIWORD(WndProcW) != 0xFFFF)
    {
      WndProc = WndProcW;
    }
    else if (WndProcA && HIWORD(WndProcA) != 0xFFFF)
    {
      WndProc = WndProcA;
    }
    else
    {
      // Debug output
      std::wcout << "WindowMgr::HookWindow: No valid window procedure found." 
        << std::endl;

      // No valid window procedure found, nothing left to do
      return;
    }

    // Hook window procedure
    PBYTE Target = reinterpret_cast<PBYTE>(WndProc);
    PBYTE Detour = reinterpret_cast<PBYTE>(WndProc_Hook);
    m_pWndProcHk.reset(new Cypher::PatchInline(Target, Detour));
    m_pWndProcHk->Enable();
  }