Tutorial: Qt Extended IPC Server

CannonListener Class Implementation

The constructor contains a single call to publishAll(). This tells the Qt Extended IPC system to make the necessary connections between the IPC messages and slots in the CannonListener class. In this example we want all messages with the same signature as the public slots to be hooked up automatically. All signals sent by this class will also be automatically broadcast to the remote clients whenever CannonListener emits the defined signal.

    CannonListener::CannonListener(QObject *parent)
        : QtopiaIpcAdaptor("QPE/CannonExample", parent)
    {
        publishAll(QtopiaIpcAdaptor::SignalsAndSlots);
    }

The shootCannon() slot will be automatically called whenever a message with the same signature arrives. The power parameter will hold the message arguments. We roll a simple dice to figure out whether the cannon hit or missed and emit a corresponding signal. This will result in the Qt Extended IPC system broadcasting and IPC message with the same signature. Finally we delete the CannonListener object by using deleteLater(). This will result in the application terminating.

    void CannonListener::shootCannon(int power)
    {
        int pwr = power % 100;
        int roll = qrand() % 100;

        if (pwr >= roll)
            emit hit();
        else
            emit missed();

        deleteLater();
    }