🚀 go-pugleaf

Hi,


I am trying to create code to detect when a network cable is unplugged.My 
intentions is to place code on a thread to monitor network connections 
and detect when a cable plugged\unplugged.

I have tried to combine code from various examples but I am not getting
the desired result. If I remove the WBEM_FLAG_RETURN_IMMEDIATELY flag
 the query fails to execute. If I leave the WBEM_FLAG_RETURN_IMMEDIATELY 
flag I fail to iterate through the results.


HRESULT hr = ::CoInitialize(NULL);
if ( FAILED( hr ) )
{
   ShowMessage("COM initialization failed");
   return;
}

// setup process-wide security context
hr = CoInitializeSecurity( NULL, // we're not a server
   		           -1, // we're not a server
			   NULL, // dito
			   NULL, // reserved
			   RPC_C_AUTHN_LEVEL_DEFAULT, // let DCOM decide
			   RPC_C_IMP_LEVEL_IMPERSONATE,
			   NULL,
			   EOAC_NONE,
			   NULL );

if ( FAILED( hr ) )
{
  ShowMessage("Security initialization failed");
  return;
}

int result = 0;
// connect to WMI
TComInterface< IWbemLocator > locator;
hr = CoCreateInstance( CLSID_WbemLocator, NULL,
     		       CLSCTX_INPROC_SERVER,
		       IID_IWbemLocator, reinterpret_cast< void** >( &locator ) );

if ( FAILED( hr ) )
{
   ShowMessage("Instantiation of IWbemLocator failed");
   return;
}

// connect to local service with current credentials
TComInterface< IWbemServices > service;
hr = locator->ConnectServer( L"root\\cimv2", NULL, NULL, NULL,
       			     WBEM_FLAG_CONNECT_USE_MAX_WAIT,
		 	     NULL, NULL, &service );

if ( SUCCEEDED( hr ) )
{
   // execute a query
   TComInterface< IEnumWbemClassObject > enumerator;
   hr = service->ExecQuery( L"WQL",
                            L"select * from MSNdis_MediaConnectStatus where "
                             "InstanceName =""\Intel(R) PRO/1000 MT Network Connection\"" ,
                             WBEM_FLAG_FORWARD_ONLY | WBEM_FLAG_RETURN_IMMEDIATELY, NULL, &enumerator );


   if ( SUCCEEDED( hr ) )
   {
	TComInterface< IWbemClassObject > ping;
	ULONG retcnt;

	// wait for result to become available
	while ( ( hr = enumerator->Next( 1L, 1L, &ping, &retcnt ) ) == WBEM_S_TIMEDOUT );
	
        if ( SUCCEEDED( hr ) )
	{
	   // add code to get connection status

        }
	else
	{
	   ShowMessage( "Error in iterating through enumeration" );
	   result;
	}
   }
   else
   {
     ShowMessage( "Query failed" );
     result;
   }
}
else
{
  ShowMessage( "Couldn't connect to service" );
  result;
	
}

CoUninitialize();