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Archived:Pausing a Symbian C++ app on an incoming call

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Archived.pngArchived: This article is archived because it is not considered relevant for third-party developers creating commercial solutions today. If you think this article is still relevant, let us know by adding the template {{ReviewForRemovalFromArchive|user=~~~~|write your reason here}}.

Article not particularly relevant. There are better ones like Monitoring call status with CTelephony.

Article Metadata
Tested with
Devices(s): Nokia E61i
Nokia E90 Communicator
Nokia N95 8GB
Nokia 6220 Classic
Compatibility
Platform(s): S60 3rd Edition, MR
S60 3rd Edition, FP1
S60 3rd Edition, FP2 Beta
S60 3rd Edition FP2
S60 3rd Edition FP1
S60 3rd Edition (initial release)
Article
Keywords: CActive, CTelephony, CTelephony::TCallStatusV1, CTelephony::TCallStatusV1Pckg, CTelephony::NotifyChange(), CTelephony::TCallStatusV1::iStatus
Created: tapiolaitinen (19 Mar 2008)
Last edited: hamishwillee (18 Sep 2012)

Contents

Overview

Sometimes an application (such as a game) needs to be paused due to an incoming call. This snippet demonstrates how to observe incoming calls, thus enabling acting on them.

MMP file

The following libraries are required:

LIBRARY etel3rdparty.lib

Header file

#ifndef __TELOBSERVER_H_
#define __TELOBSERVER_H_
 
#include <e32base.h>
#include <Etel3rdParty.h>
 
class CTelObserver : public CActive
{
public:
/**
* Symbian OS default constructor
*/

CTelObserver();
 
/**
* 2nd phase constructor.
*/

static CTelObserver* NewL();
 
/**
* 2nd phase constructor.
*/

static CTelObserver* NewLC();
 
/**
* Destructor
*/

~CTelObserver();
 
/**
* Starts observing for the incoming calls.
*/

void StartListening();
 
private:
/**
* Symbian 2-phase constructor
*/

void ConstructL();
 
/**
* From CActive
*/

void RunL();
 
/**
* From CActive
*/

TInt RunError(TInt anError);
 
/**
* From CActive
*/

void DoCancel();
 
private: // Data
CTelephony* iTelephony;
 
CTelephony::TCallStatusV1 iCallStatus;
CTelephony::TCallStatusV1Pckg iCallStatusPkg;
};
 
#endif /*__TelObserver_H_*/

Source file

#include <e32base.h>
#include <Etel3rdParty.h>
 
#include "TelObserver.h"
 
/**
* Constructor. Defines the priority for this active object.
*/

CTelObserver::CTelObserver() :
CActive(EPriorityStandard),
iCallStatusPkg(iCallStatus)
{
}
 
/**
* 2nd phase constructor.
*/

CTelObserver* CTelObserver::NewL()
{
CTelObserver* self = CTelObserver::NewLC();
CleanupStack::Pop(self);
return self;
}
 
/**
* 2nd phase constructor.
*/

CTelObserver* CTelObserver::NewLC()
{
CTelObserver* self = new (ELeave) CTelObserver();
CleanupStack::PushL(self);
self->ConstructL();
return self;
}
 
/**
* 2nd phase constructor.
*/

void CTelObserver::ConstructL()
{
iTelephony = CTelephony::NewL();
 
CActiveScheduler::Add(this);
}
 
/**
* Destructor.
*/

CTelObserver::~CTelObserver()
{
Cancel();
 
if (iTelephony)
delete iTelephony;
}
 
/**
* From CActive.
*/

void CTelObserver::RunL()
{
if (iStatus == KErrNone)
{
CTelephony::TCallStatus status = iCallStatus.iStatus;
 
switch (status)
{
case CTelephony::EStatusRinging:
{
// The phone is ringing. Pause the application.
// ...
break;
}
default:
{
// Not interested in other events.
break;
}
}
// Start listening for the next call
StartListening();
}
}
 
/**
* From CActive.
*/

TInt CTelObserver::RunError(TInt anError)
{
return anError;
}
 
/**
* From CActive.
*/

void CTelObserver::DoCancel()
{
iTelephony->CancelAsync(CTelephony::EVoiceLineStatusChangeCancel);
}
 
/**
* Starts observing for the incoming calls.
*/

void CTelObserver::StartListening()
{
iTelephony->NotifyChange(iStatus, CTelephony::EVoiceLineStatusChange,
iCallStatusPkg);
SetActive();
}

Postconditions

When the phone is ringing, the application branches to CTelephony::EStatusRinging in CTelObserver::RunL().

This page was last modified on 18 September 2012, at 04:15.
115 page views in the last 30 days.

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