Categories: Symbian C++ | Code Examples | Telephony | Location Based Services

This page was last modified 13:33, 20 November 2007.

From Forum Nokia Wiki

To find out the phone's current cell ID in S60 3rd Edition devices, the application must be Symbian Signed, since it requires the ReadDeviceData capability. The programmer must use an active object because the calls are asynchronous. Below is an example of a class that retrieves the Cell ID by request.

NetworkInfo.h

#ifndef __NETWORKINFO_H__
#define __NETWORKINFO_H__
 
#include <etel3rdparty.h> // CTelephony
 
// Observer interface
class MNetworkInfoObserver
    {
    public:
        virtual void NetworkInfoRetrievedL(
            const CTelephony::TNetworkInfoV1& aNetworkInfo) = 0;
        virtual void HandleNetworkInfoError(TInt aError) = 0;
    };
 
// Active object to get network info
class CNetworkInfo : public CActive
    {
    public:
        static CNetworkInfo* NewL();
        ~CNetworkInfo();
 
        void GetNetworkInfoL(MNetworkInfoObserver* aObserver);
 
    protected:
        // from CActive
        void RunL();
        TInt RunError(TInt aError);
        void DoCancel();
 
    private:
        CNetworkInfo();
        void ConstructL();
 
    private:
        CTelephony* iTelephony;
        CTelephony::TNetworkInfoV1 iNwInfo;
        CTelephony::TNetworkInfoV1Pckg iNwInfoPckg;
        MNetworkInfoObserver* iObserver;
    };
 
#endif // __NETWORKINFO_H__

NetworkInfo.cpp

#include "NetworkInfo.h"
 
CNetworkInfo::CNetworkInfo()
    : CActive(EPriorityStandard),
      iNwInfoPckg(iNwInfo)
    {
    CActiveScheduler::Add(this);
    }
 
CNetworkInfo* CNetworkInfo::NewL()
    {
    CNetworkInfo* self = new (ELeave) CNetworkInfo;
    CleanupStack::PushL(self);
    self->ConstructL();
    CleanupStack::Pop();
    return self;
    }
 
void CNetworkInfo::ConstructL()
    {
    iTelephony = CTelephony::NewL();
    }
 
CNetworkInfo::~CNetworkInfo()
    {
    Cancel();
    delete iTelephony;
    }
 
// This function is used by our class' users to start getting network info.
void CNetworkInfo::GetNetworkInfoL(MNetworkInfoObserver* aObserver)
    {
    __ASSERT_ALWAYS(!IsActive(), User::Leave(KErrInUse));
    iObserver = aObserver;
 
    // Start async call to receive current network information
    iTelephony->GetCurrentNetworkInfo(iStatus, iNwInfoPckg);
    SetActive();
    }
 
void CNetworkInfo::DoCancel()
    {
    iTelephony->CancelAsync(CTelephony::EGetCurrentNetworkInfoCancel);
    }
 
void CNetworkInfo::RunL()
    {
    User::LeaveIfError(iStatus.Int());
    // Request completed successfully.
    // Now we can notify our observer.
    if(iObserver)
        {
        iObserver->NetworkInfoRetrievedL(iNwInfoPckg());
        }
    }
 
TInt CNetworkInfo::RunError(TInt aError)
    {
    // There was an error retrieving current network info.
    // Let's inform our observer about the error so that it can analyze it
    // and try to recover.
    if(iObserver)
        {
        iObserver->HandleNetworkInfoError(aError);
        }
 
    return KErrNone;
    }

Related Links

• DevInfo - Get the IMEI, IMSI, CellId etc., synchronously on 3.x devices.