C / C++ / MFC

STATIC BOOL CALLBACK MyEnumWindowsProc(
  HWND hwnd,
  LPARAM lparam) // additional parameter that we are not using in this example
{
  if(ThisIsTheWindowImLookingFor(hwnd)){ //found it!
    return FALSE;
  }
  else return TRUE; // keep trying
}
...
EnumWindows(MyEnumWindowsProc,0);
// the second parameter which we set to zero is that passed
// as lparam to MyEnumWindowsProc. Could be used to carry along
// some information like (for instance), a pointer to data needed
// by the enumeration proc.

BOOL CMyDialog::FindMySpecificWindow()
{
 return ::EnumWindows(gfnEnumWindowsProc, (LPARAM)this);
}

bool CMyDialog::CheckWindow(HWND hWnd)
{
  // Add your code to check anything from this
}


BOOL CALLBACK gfnEnumWindowsProc(HWND hWnd, LPARAM lParam)
{
  CMyDialog* pThis = reinterpret_cast<CMyDialog*>( lParam );
  if (pThis->CheckWindow(hWnd))
  {
    return TRUE;
  }
 return FALSE;
}

NETRESOURCE* operator &()
  {
      return &m_nr;
  }

  operator NETRESOURCE() const
  {
      return m_nr;
  }