QDBus服务端与客户端实例

服务端：

{
    if (!QDBusConnection::connectToBus(QDBusConnection::SessionBus,QString("c2box")).isConnected()) {
      fprintf(stderr, "Cannot connect to the D-Bus session bus.\n"
      "To start it, run:\n"
      "\teval `dbus-launch --auto-syntax`\n");
      return;
    }

    if (!QDBusConnection::connectToBus(QDBusConnection::SessionBus,QString("c2box")).registerService(DBUS_SERVICE_NAME)) {
      fprintf(stderr, "%s\n",
      qPrintable(QDBusConnection::connectToBus(QDBusConnection::SessionBus,QString("c2box")).lastError().message()));
      exit(1);
    }

    PlayerSetting* playerSetting = this;
//把playerSetting 作为interface，即把playerSetting对象中的
    QDBusConnection::connectToBus(QDBusConnection::SessionBus,QString("c2box")).registerObject(DBUS_PLAYER_SETTING_PATH, playerSetting, QDBusConnection::ExportAllSlots);
  }
客户端：

 QDBusInterface* dbusIterface;
if(!QDBusConnection::connectToBus(QDBusConnection::SessionBus,QString("c2box")).isConnected()) {
      fprintf(stderr, "Cannot connect to the D-Bus session bus.\n"
              "To start it, run:\n"
              "\teval `dbus-launch --auto-syntax`\n");
      return;
  }
  dbusIterface = new QDBusInterface(DBUS_SERVICE_NAME, DBUS_PLAYER_SETTING_PATH, "", QDBusConnection::connectToBus(QDBusConnection::SessionBus,QString("c2box")), parent);
  if ((dbusIterface!=NULL) && !dbusIterface->isValid()) {
    delete dbusIterface;
    dbusIterface = NULL;
  }

//通过call 调用dbus service 提供的接口GetValue，item为参数。得到返回的结果为int类型的QDBusReply
  QDBusReply reply = dbusIterface->call("GetValue", item);
  if (reply.isValid()) {
    int value = reply.value();
//通过call 调用dbus service 提供的接口GetString，item为参数。得到返回的结果为QString类型的//QDBusReply
 QDBusReply reply = dbusIterface->call("GetString", item);
  if (reply.isValid()) {
    return reply.value();
  }


推出客户端时候：
  if (dbusIterface!=NULL)
    delete dbusIterface;