Help with QtDBus signals

[zuck]

Hi, I need to send signals over a dbus connection.

This is the remote object adaptor code:

pkcontextbardbusadaptor.h

#include <QtDBus>
#include "pkcontextbar.h"
 
class pkContextBarDBusAdaptor : public QDBusAbstractAdaptor
{
    Q_OBJECT
    Q_CLASSINFO("D-Bus Interface", "it.card-tech.pk.contextBar")
 
protected:
    pkContextBar* m_owner;
 
public:
    pkContextBarDBusAdaptor(pkContextBar* owner);
 
public slots:
    int addAction(const QString& text);
    void clear();
 
private slots:
    void actionTriggered(QAction* action);
 
signals:
    void triggered(int);
};

#include <QtDBus>
#include "pkcontextbar.h"

class pkContextBarDBusAdaptor : public QDBusAbstractAdaptor
{
    Q_OBJECT
    Q_CLASSINFO("D-Bus Interface", "it.card-tech.pk.contextBar")

protected:
    pkContextBar* m_owner;

public:
    pkContextBarDBusAdaptor(pkContextBar* owner);

public slots:
    int addAction(const QString& text);
    void clear();

private slots:
    void actionTriggered(QAction* action);

signals:
    void triggered(int);
};

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pkcontextbardbusadaptor.cpp

#include "pkcontextbardbusadaptor.h"
 
pkContextBarDBusAdaptor::pkContextBarDBusAdaptor(pkContextBar* owner)
        : QDBusAbstractAdaptor(owner),
          m_owner(owner)
{
    this->connect(m_owner, SIGNAL(triggered(QAction*)), this, SLOT(actionTriggered(QAction*)));
}
 
/** ... CUT ... **/
 
void pkContextBarDBusAdaptor::actionTriggered(QAction* action)
{
    QList<QAction*> actions = m_owner->actions();
    int action_count = actions.count();
 
    for (int i = 0; i < action_count; i++)
    {
        if (actions[i] == action)
        {
            emit triggered(i); // <--- Here is the problem.
            break;
        }
    }
}

#include "pkcontextbardbusadaptor.h"

pkContextBarDBusAdaptor::pkContextBarDBusAdaptor(pkContextBar* owner)
        : QDBusAbstractAdaptor(owner),
          m_owner(owner)
{
    this->connect(m_owner, SIGNAL(triggered(QAction*)), this, SLOT(actionTriggered(QAction*)));
}

/** ... CUT ... **/

void pkContextBarDBusAdaptor::actionTriggered(QAction* action)
{
    QList<QAction*> actions = m_owner->actions();
    int action_count = actions.count();

    for (int i = 0; i < action_count; i++)
    {
        if (actions[i] == action)
        {
            emit triggered(i); // <--- Here is the problem.
            break;
        }
    }
}

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This is the pkContextBar constructor body, where I attach the dbus adaptor to the concrete object:

pkcontextbar.cpp

#include "pkcontextbar.h"
#include "pkcontextbardbusadaptor.h"
 
pkContextBar::pkContextBar(QWidget* parent)
        : QMenuBar(parent),
          m_ui(new Ui::pkContextBar)
{
    m_ui->setupUi(this);
 
    new pkContextBarDBusAdaptor(this);
}

#include "pkcontextbar.h"
#include "pkcontextbardbusadaptor.h"

pkContextBar::pkContextBar(QWidget* parent)
        : QMenuBar(parent),
          m_ui(new Ui::pkContextBar)
{
    m_ui->setupUi(this);

    new pkContextBarDBusAdaptor(this);
}

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The object is registered on the dbus in the main application body:

pkContextBar* context_bar = new pkContextBar(m_desktop);
QDBusConnection bus = QDBusConnection::sessionBus();
bus.registerService("it.card-tech.pk.server");
bus.registerObject("/desktop/contextBar", context_bar);

pkContextBar* context_bar = new pkContextBar(m_desktop);
QDBusConnection bus = QDBusConnection::sessionBus();
bus.registerService("it.card-tech.pk.server");
bus.registerObject("/desktop/contextBar", context_bar);

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When the pkContextBarDBusAdaptor::actionTriggered is invoked, the triggered signal emission fails and returns this error message:

process 16161: arguments to dbus_message_new_signal() were incorrect, assertion "_dbus_check_is_valid_interface (interface)" failed in file dbus-message.c line 1162.
This is normally a bug in some application using the D-Bus library.
QDBusConnection: Could not emit signal it.card-tech.pk.contextBar.triggered

Help me, please

[talk2amulya]

i think you have registered the wrong service, it should be it.card-tech.pk.contextBar..u have used it.card-tech.pk.server...

[zuck]

The problem is in service and interface names: the "-" character is not allowed

[pierrem2000]

I having the exact same issue:

process 10907: arguments to dbus_message_new_signal() were incorrect, assertion "interface != NULL" failed in file dbus-message.c line 1159.
This is normally a bug in some application using the D-Bus library.

This occurs when the signal is "emitted".

And I'm not using "-" in my service name...

Anybody has ideas of what could cause this?