dbus-native/examples/basic-client.js

D-bus protocol implementation in native javascript

const dbus = require('../index');

/*
	This test file's purpose is to show how to query a simple, basic DBus service with this library.
	In order to do that, we connect to the session bus, request the basic service (launch with 'node basic-service.js')
	and issue method calls.

	For instance you can use `gdbus` to introspect a service and make function calls.
	- introspect: `gdbus introspect -e -d com.dbus.native.return.types -o /com/dbus/native/return/types`
	- make a method call: `gdbus introspect -e -d com.dbus.native.return.types -o /com/dbus/native/return/types -m com.dbus.native.return.types.FunctionName`
*/

const serviceName = 'com.dbus.native.basic.service'; // the service we request

// The interface we request of the service
const interfaceName = serviceName;

// The object we request
const objectPath = `/${serviceName.replace(/\./g, '/')}`;

// First, connect to the session bus (works the same on the system bus, it's just less permissive)
const sessionBus = dbus.sessionBus();

// Check the connection was successful
if (!sessionBus) {
  throw new Error('Could not connect to the DBus session bus.');
}

const service = sessionBus.getService(serviceName);

service.getInterface(objectPath, interfaceName, (err, iface) => {
  if (err) {
    console.error(
      `Failed to request interface '${interfaceName}' at '${objectPath}' : ${
        err
      }`
        ? err
        : '(no error)'
    );
    process.exit(1);
  }

  iface.GiveTime((err, str) => {
    if (err) {
      console.error(`Error while calling GiveTime: ${err}`);
    } else {
      console.log(`GiveTime returned: ${str}`);
    }

    iface.Capitalize('Hello, World!', (err, str) => {
      if (err) {
        console.error(`Error while calling Capitalize: ${err}`);
      } else {
        console.log(`Capitalize returned: ${str}`);
      }
    });
  });

  iface.on('Rand', nb => {
    console.log(`Received Rand: ${nb}`);
  });
});