Categories: Symbian C++ | S60 | Bluetooth | Code Examples

This page was last modified 14:40, 7 May 2008.

From Forum Nokia Wiki

Many a times it happens that a user terminates a program which has actually sent a request for a service. Ideally if an Exit command is fired the pending request should be cancelled and then the program should be terminated. But in some cases the pending request takes a considerable amount of time to be cancelled. For e.g. a Bluetooth discovery request

void CDeviceDiscoverer::DiscoverDevicesL(TDeviceDataList* aDevDataList)
	{
 
	iDiscoveredDeviceCount=0;
	// wipe existing device data list, start fresh
	iDevDataList=aDevDataList;
	iDevDataList->Reset();
 
	// load protocol for discovery
	TProtocolDesc pdesc;
	User::LeaveIfError(iSocketServ.FindProtocol(KBTLinkManagerTxt(), pdesc));
 
	// initialize host resolver
	User::LeaveIfError(iResolver.Open(iSocketServ, pdesc.iAddrFamily, 
         pdesc.iProtocol));
 
	// start device discovery by invoking remote address lookup
	iAddr.SetIAC(KGIAC);
	iAddr.SetAction(KHostResInquiry|KHostResName|KHostResIgnoreCache);
	iResolver.GetByAddress(iAddr, iEntry, iStatus);
	SetActive();
	}

does not end fast with a call to Cancel().

In such one option is to show a wait note.

Other workaround is to send the application to the background and exit once the request has been canceled or the request is completed.