Sending structure as a parameter of a signal

[MarijaJankovic623]

Hello,

When I try to send my custom structure, that extends Structure from your library, and send it as a parameter of my custom signal, extended from DBusSignal, I always get EOF error.

I think that there is some problem with parameter sig in the constructor of DBusSignal, when I pass "r", "(" or "(r)" I get EOF exception, and when I pass ")" nothing happens, a message is not added to the queue for sending at all.

[hypfvieh]

Please show the code of your structure and your signal, so I can try to reproduce the error.

[MarijaJankovic623]

Code for my custom signal:

import org.freedesktop.dbus.DBusInterface;
import org.freedesktop.dbus.DBusInterfaceName;
import org.freedesktop.dbus.DBusSignal;
import org.freedesktop.dbus.exceptions.DBusException;

@DBusInterfaceName("org.freedesktop.systemd1")
public interface DBus extends DBusInterface {
    public static final String DBUS = "org.freedesktop.systemd1";
    public static final String DBUS_PATH = "/org/freedesktop/systemd1";

    public class ownerDataSignal extends DBusSignal {
        private final OwnerInformationStruct ownerInformationStruct;

        public ownerDataSignal(OwnerInformationStruct ownerInformationStruct)
                throws DBusException {
            super(DBUS, DBUS_PATH, DBUS, "ownerDataSignal", "r", ownerInformationStruct);
            this.ownerInformationStruct = ownerInformationStruct;
        }
    }
}

Code for my custom structure:

import org.freedesktop.dbus.Position;
import org.freedesktop.dbus.Struct;
import org.freedesktop.dbus.UInt32;

public final class OwnerInformationStruct extends Struct {
    @Position(0)
    public final UInt32 error;
    @Position(1)
    public final String name;
    @Position(2)
    public final String address;

    public OwnerInformationStruct(UInt32 error, String name, String address) {
        this.error = error;
        this.name = name;
        this.address = address;
    }

}

Code from where I'm sending a signal:

OwnerInformationStruct ownerInformationStruct = new OwnerInformationStruct(new UInt32(1), "TEST", "TEST");
public void run() {
        DBusConnection conn;
        try {
            conn = DBusConnection.getConnection(DBusConnection.SYSTEM);
            conn.sendSignal(new DBus.ownerDataSignal(ownerInformationStruct));
        } catch (DBusException e) {
            e.printStackTrace();
        }

    }

Error that I get:

org.freedesktop.dbus.exceptions.FatalDBusException: Underlying transport returned EOF

[MarijaJankovic623]

I managed to resolve my issue, to send as sig value "(iss)". Thank you.