Re: PropertiesChanged

[Marcin Klekot <m klekot sirrix com>]

Hi Dan,

thanks for your answer. With the dbus-monitor I see the
PropertiesChanged signal on the interface
org.freedesktop.NetworkManager.AccessPoint, but not in my Qt Application.
The dbus-monitor output is:

signal sender=:1.5 -> dest=(null destination) serial=3364
path=/org/freedesktop/NetworkManager/AccessPoint/4;
interface=org.freedesktop.NetworkManager.AccessPoint;
member=PropertiesChanged
   array [
      dict entry(
         string "Strength"
         variant             byte 40
      )
   ]


Let me explain the steps i did to establish the DBus connection in my Qt
App, maybe someone see a mistake.

First I created the interface class from the nm-access-point.xml
introspection file. Because the qdbusxml2cpp compiler does not
understand the type a{sv}, I added an annotation as follows:
    <signal name="PropertiesChanged">
		<annotation name="com.trolltech.QtDBus.QtTypeName.In0" value="Dict"/>
        <arg name="properties" type="a{sv}" tp:type="String_Variant_Map">

The created header file is:
*
 * This file was generated by qdbusxml2cpp version 0.7
 * Command line was: qdbusxml2cpp nm-access-point.xml -p
AccessPointInterface
 *
 * qdbusxml2cpp is Copyright (C) 2009 Nokia Corporation and/or its
subsidiary(-ies).
 *
 * This is an auto-generated file.
 * Do not edit! All changes made to it will be lost.
 */

#ifndef ACCESSPOINTINTERFACE_H_1268036583
#define ACCESSPOINTINTERFACE_H_1268036583

#include <QtCore/QObject>
#include <QtCore/QByteArray>
#include <QtCore/QList>
#include <QtCore/QMap>
#include <QtCore/QString>
#include <QtCore/QStringList>
#include <QtCore/QVariant>
#include <QtDBus/QtDBus>
typedef QMap<QString, QVariant > Dict; //added manualy
Q_DECLARE_METATYPE (Dict)  //added manualy

/*
 * Proxy class for interface org.freedesktop.NetworkManager.AccessPoint
 */
class OrgFreedesktopNetworkManagerAccessPointInterface: public
QDBusAbstractInterface
{
    Q_OBJECT
public:
    static inline const char *staticInterfaceName()
    { return "org.freedesktop.NetworkManager.AccessPoint"; }

public:
    OrgFreedesktopNetworkManagerAccessPointInterface(const QString
&service, const QString &path, const QDBusConnection &connection,
QObject *parent = 0);

    ~OrgFreedesktopNetworkManagerAccessPointInterface();

    Q_PROPERTY(uint Flags READ flags)
    inline uint flags() const
    { return qvariant_cast< uint >(internalPropGet("Flags")); }

/* some loc throwed away */

    Q_PROPERTY(uint WpaFlags READ wpaFlags)
    inline uint wpaFlags() const
    { return qvariant_cast< uint >(internalPropGet("WpaFlags")); }

//public Q_SLOTS: // METHODS
Q_SIGNALS: // SIGNALS
    void PropertiesChanged(Dict properties);
};
#endif

In the source code I defined Dict as follows:
typedef QMap<QString, QVariant > Dict;
Q_DECLARE_METATYPE (Dict)

and registered it with qDBusRegisterMetaType<Dict>() in the constructor
of the interface class.

After creating an instance of that class I connected the
PropertiesChanged signal to an appropriate slot with:

connect(m_pAccesspointInterface, SIGNAL(PropertiesChanged(Dict)), this,
SLOT(on_APPropertiesChanged(Dict)));

I can read the properties (for example with strength()) and the returned
values corresponds to the values reported by dbus-monitor, but the
signal PropertiesChanged is not signaled.

I did the same steps with nm-exported-connection.xml with the following
annotation for the parameter in the Updated signal:
<annotation name="com.trolltech.QtDBus.QtTypeName.In0" value="DictOfDicts"/>

and the appropriate typedef in my source code:
typedef QMap<QString, QVariant > Dict;
Q_DECLARE_METATYPE (Dict)
typedef QMap<QString, Dict > DictOfDicts;
Q_DECLARE_METATYPE (DictOfDicts)

On this interface my application gets the Updated signal correctly.
Any suggestions?

Dan Williams schrieb:
> On Fri, 2010-03-19 at 17:55 +0100, Marcin Klekot wrote:
>> Hi All,
>>
>> i am writing a qt based NM applet to configure wireless connections.
>> With qdbusxml2cpp I created all needed interface classes from the
>> introspection xml files. With this classes i can now talk to
>> networkmanager over dubs (adding and deleting connections, connecting
>> and disconnecting, and so on)
>> The problem I have is that on no interface PropertiesChanged is
>> signaled. Other signals like 'NewConnection' on 'NetworkManagerSetting'
>> or  'Updated' on 'NetworkManagerSettings.Connection' are signaled
>> correctly.
>> I assumed that PropertiesChanged would be signaled on
>> NetworkManager.Connection. Active if the connection state changes but
>> this is not the case. PropertiesChanged is also not signaled on
>> NetworkManager.Device.Wireless when the appropriate device connects or
>> disconnects. On the other hand AccessPointAdded is signaled correctly.
>>
>> Any suggestions why  PropertiesChanged is not signaled?
> 
> I'm very sure you should be getting these signals.  I've verified that
> the Bitrate property of the the Device.Wireless interface does get a
> PropertiesChanged signal emitted when it changes.
> 
> Run "dbus-monitor --system" and walk away from your AP, for example.
> The bitrate should drop the farther away you get.
> 
> Dan
> 
> 
>