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Application Services are standardized APIs to access functionality supplied by other applications. They allow applications to invoke the services of other applications, while allowing the specific application providing the service to be selected by the system integrator or end-user. Messages between applications are delivered via Qt Extended IPC.

Pre-defined Services

The following provides a list of the pre-defined services:

Available Services

Alarm ContentSetView PackageManager Suspend
AlarmServer Date PhotoEdit SystemMessages
Alert Dialer PlayMedia TaskManager
BluetoothPush Email Presence Tasks
Calendar Favorites PrintServer Telephony
CallForwarding Help Profiles Time
CallHistory InfraredBeaming QtopiaApplicationService TimeMonitor
CallNetworks InputMethod QtopiaPowerManager TimeUpdate
Camera InstantMessage Ringtone VirtualKeyboard
CleanupWizard Messages RotationManager VoiceRecording
Clock ModemEmulator Settings WebAccess
Contacts NetworkSetup SettingsManager
ContactsPhone OmaDrmAgent SMS

Requesting Services

To request a service, the calling application executes:

    QtopiaServiceRequest srv(servicename, action);
    srv << parameters;

For example:

    QtopiaServiceRequest srv("WebAccess", "openURL(QString)");
    srv << QString("www.example.com");

QtopiaServiceRequest::send() returns a boolean value indicating whether the service is available. The next image demonstrates the service interaction, assuming that the qtmail application is requesting the WebAccess service:

"Qtopia Service execution"

Responding to Service Requests

To respond to a service request, an application should use the QtopiaAbstractService class. The following example responds to the openURL(QString) request on the WebAccess service. It would typically be implemented by a Web browser application:

    class WebAccessService : public QtopiaAbstractService
        WebAccessService( QObject *parent )
            : QtopiaAbstractService( "WebAccess", parent )
            { publishAll(); }

    public slots:
        void openURL( const QString& url );

When an openURL(QString) request arrives, it will be automatically delivered to the WebAccessService::openURL() slot in the application.

Applications register as providing a service by supplying a standard Qt Extended configuration file, $QPEDIR/services/<servicename>/<appname> where:

The standard keys in this file are:

The file may contain any additional sections, keys and values as defined by the documentation of the service.

Adding a New Service

Each new service must be carefully specified as it provides a system- wide API that can be invoked by other applications and the user. A service should only be added if it:

To add a new service, provide a standard Qt Extended configuration file, $QPEDIR/services/<servicename>.service. The keys in this file are:

For example:

    Actions = "raiseToday();newEvent()"
    Icon = datebook_icon
    Icon = datebook_icon
    Name[]=New event
    Name[]=Today's calendar

Usually, only one application responds to a given service. The user selects the application to handle the service using the Application Serviceas settings. If the service can be provided by multiple applications, the service file will contain:

    Multiple = 1

in the [Service] section.

Advanced Service Functionality

Some services may be parameterised on the type of data to be processed. Different applications may handle different data types. The Qt Extended Data Sharing (QDS) system should be used for these types of services.

Copyright © 2009 Trolltech Trademarks
Qt Extended 4.4.3