Declare the signal in the D-Bus adapter
D-Bus is a message-passing system for inter-process communication, which provides a mechanism for different applications to interact through messages. In D-Bus, signals are an important mechanism that allow senders to send event notifications to receivers. In this article, we discuss how to declare signals in a D-Bus adapter and provide corresponding source code examples.
Declaring a signal in D-Bus requires the following steps:
Step 1: Define Interfaces and Signals
First, we need to define a D-Bus interface and declare our signals in the interface. Here is an example interface definition:
interface org.example.SampleInterface {
signal SampleSignal(string message);
};
In the above example, we defined an interface named org.example.SampleInterface, and declared a signal named SampleSignal in the interface, which has a parameter message of type string.
Step 2: Implement the Adapter Class
Next, we need to create an adapter class that will implement the interface we defined. The adapter class is responsible for