Q_DECLARE_METATYPE(MyProgress)

QDBusArgument &operator<=
;<(QDBusArgument &=
amp;argument, <=
span style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(128, 128, 0);">const MyProgress& parameterProgress<=
span style=3D"color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, =
sans-serif; font-size: 12pt;">)

    argument.beginStructure();

    argument << parameterProgress.m_Progress;

    argument << parameterProgress.m_Message;

    argument << parameterProgress.m_Additional;

    argument.endStructure();

    return argument=
;

const QDBusArgument &operator>&g=
t;(const=
 QDBusArgument &argument=
, MyProgress& parameterProgress)

    argument.beginStructure();

    argument >> parameterProgress.m_Progress;

    argument >> parameterProgress.m_Message;

    argument >> parameterProgress.m_Additional;

    argument.endStructure();

    return argument=
;

MyProgress ::MyProgress(){

    qRegisterMetaType<MyProgress>();

    qDBusRegisterMetaTy=
pe<MyProgress>();

MyProgress.h:

#ifndef MYPROGRESS_H=
=0A=
#define MYPROGRESS_H=0A=
#include <QObject>
#include <QDBusArgument>
#include <QMetaType>
#include <QDBusMetaType>

class MyProgress{
public:    MyProgress=
();
    ~MyProgress<=
/span>();
    int m_Progress;
=
    QString m_Message;
    int <=
span style=3D"color:#800000">m_Additional;
public slots<=
/span>:
    friend QDBusArgument &operator<<(QDBusArgument&nbs=
p;&argument, const RaucProgress &parameterProgress);
    friend =
;const QDBusArgument &operator>>(const QDBusArgument &argume=
nt, RaucProgress &paramet=
erProgress);
};<=
pre style=3D"margin-top:0px;margin-bottom:0px">#endif //&nb=
sp;MYPROGRESS_H



update.cpp:
...
&nb=
sp;   QDBusInterfaceinterface( "de.pengutronix.rauc",=0A=
                  =
            "/",
          &nbs=
p;                   "de.pengutronix.rauc.Installer",
                 =
             QDBusConnection::systemBus=
() );

    if (interface.i=
sValid() =3D=3D true)<=
/pre>    {
        qDebug() << "interface&=
nbsp;is valid";<=
pre style=3D"color: rgb(0, 0, 0); font-family: Calibri, Arial, Helvetica, s=
ans-serif; margin-top: 0px; margin-bottom: 0px;">                  qDebug=
() << "Read property (Progress)";
       QVariant property =3D interface.property("Progress");
    =
  property.value=
<>() >=
;> parameterProgress
<=
/pre>       qDebug() << parameterProgress.<=
span style=3D"font-family: Calibri, Arial, Helvetica, sans-serif; font-size=
: 12pt; color: rgb(128, 0, 0);">m_Progress;
       qDebug() <&=
lt; parameterProgress.m_Message;     }
...




parameterProgress is delcared in the update.h=



I have a last question. Maybe you can answer =
it. Why have I add the keyword "friend" in front of the QDBusArgu=
ments? I wount compile without it.


Many thanks.


Kind regards 
Michael

Von: RAUC <rauc-bounces@= pengutronix.de> im Auftrag von Stahl, Michael <mstahl@moba.de>
Gesendet: Montag, 2. August 2021 14:45
An: Eugen.Wiens@JUMO.net <Eugen.Wiens@JUMO.net>
Cc: RAUC@pengutronix.de <RAUC@pengutronix.de>
Betreff: Re: [RAUC] Antwort: D-Bus control Qt

Hi Eugen,

thanks for the informations. They were very useful. Some lines are familiar= to me because I tested a lot.

But I still need some support.

This is the way I request the property:

MyProgress parameterProgress;

QDBusInt= erface interface( "de.pengutronix.rauc",

                    <=
/span>"/",

                    "de.pengutronix.rauc.Installer",

                    <=
/span>QDBusConnection::systemBus() );

QVariant= property =3D interface.property("Progress");

p=
roperty.value=
<QDBusArgu=
ment>()&=
nbsp;>>parameterProgress;

No I=
 get a compiler error:

no m=
atch for operator>>'(opernad types are 'QDBusArgument' and 'MyProgres=
s')

I th=
ink I do the registration an the installing of the oparators wrong.<=
/pre>

=

The =
registration is done in the constructor of MyProgress:
=
MyProgress ::=
My<=
span style=3D"font-family:calibri,arial,helvetica,sans-serif; font-size:12p=
t; color:rgb(0,103,124); background-color:rgba(0,0,0,0)">Progress()=
{

=
    qRegisterMetaType=
<MyProgress>();
    qDBusRegisterMetaType<MyProgress>();

The magic statement I place in top of my MyProcess.cpp

// this is one of the magic statements
Q_DECLARE_METATYPE(MyProgress)

But where exactly do you place the operators? Also in the MyProcess.cpp?&nb= sp;

QDBusArgument &operator<<(QDBusArgument &argument, con= st MyProgress& parameterProgress);
const QDBusArgument &operator>>(const QDBusArgument &a= rgument, MyProgress& parameterProgress);

QDBusArgument &operator<<(QDBusArgument &argument, con= st MyProgress& parameterProgress)
{
argument.beginStructure();
argument << parameterProgress.m_Progress;=
argument << parameterProgress.m_Message;<= /tt> argument << parameterProgress.m_Additional; argument.endStructure(); return argument; } const QDBusArgument &operator>>(const QDBusArgument &a= rgument, MyProgress& parameterProgress) { argument.beginStructure(); argument >> parameterProgress.m_Progress;= argument >> parameterProgress.m_Message;<= /tt> argument >> parameterProgress.m_Additional; argument.endStructure(); return argument; }

It seems like I am only a few millimeters away from my goal. Thanks Von: Eugen.Wiens@JUMO.net= <Eugen.Wiens@JUMO.net> Gesendet: Montag, 2. August 2021 13:41 An: Stahl, Michael <mstahl@moba.de> Cc: RAUC@pengutronix.de <RAUC@pengutronix.de> Betreff: Antwort: [RAUC] D-Bus control Qt Hi Michael, "RAUC" <rauc-bounces@pengutronix.de> s= chrieb am 02.08.2021 08:15:26: > Von: "Stahl, Michael" <mstahl@moba.de> > An: "RAUC@pengutronix.de" <RAUC@peng= utronix.de> > Datum: 02.08.2021 08:15 > Betreff: [RAUC] D-Bus control Qt > Gesendet von: "RAUC" <rauc-bounces@p= engutronix.de> > > Is there someone who implemented the DBus Property "Progress"= ; into a > Qt-Application? The problem seems the return value isi (Integer, > String, Integer). > For all other properties with a single return val= ue like "Operation" > or "LastError" the Qt DBus API works fine. > I found an email from 28.Oct 2019 in the mailing = list where Bastian > Krause had the same issue. The answer was only that he had to > cunsult the Qt DBus documentation on how a tuple is mapped to Qt types= . > > Thats a good hint but after hours of searching the web I didn't find > a solution. The return value for a property is QVariant in Qt. = > > Trial 1 -> Read value by iface.property("Progress"): > This is the error message I got when I try to rea= d the progress property: > Cannot construct placeholder type QDBusRawType > > Trial 2 -> Read value by iface.call("Get",...): > Not able to get any information. The arguments of= the returned > QDBusMessages are always empty! That is the way we implemented it: On Qt there are some pitfalls and you has to marshalin= g the data. 1. Create a Data Class #include <QObject> #include <QDBusArgument> #include <QString> class MyProgress { public: [...] int m_Progress; QString m_Message; int m_Additional; }; // this is one of the magic statements Q_DECLARE_METATYPE(MyProgress) QDBusArgument &operator<<(QDBusArgument &= ;argument, const MyProgress& parameterProgress); const QDBusArgument &operator>>(const QDBusA= rgument &argument, MyProgress& parameterProgress); }; You has to register the metatype and implement the ope= rators. In the Constructor you has to add two register Methods qRegisterMetaType<MyProgress>(); qDBusRegisterMetaType<MyProgress>();= After this tree registrations your Class MyProgress is= known by Qt Metatype System. Now you has to implement operators QDBusArgument &operator<<(QDBusArgument &= ;argument, const MyProgress& parameterProgress) { argument.beginStructure(); argument << parameterProgress.m_Pr= ogress; argument << parameterProgress.m_Me= ssage; argument << parameterProgress.m_Ad= ditional; argument.endStructure(); return argument; } const QDBusArgument &operator>>(const QDBusA= rgument &argument, MyProgress& parameterProgress) { argument.beginStructure(); argument >> parameterProgress.m_Pr= ogress; argument >> parameterProgress.m_Me= ssage; argument >> parameterProgress.m_Ad= ditional; argument.endStructure(); return argument; } Now you are finished with preparing how to use it. In = the Qt Slot of the D-Bus call your can pipe it in your class MyProgress parameterProgress; property.value<QDBusArgument>() >> paramet= erProgress; This URL help you to map our code to the Qt example https://doc.qt.io/qt-5/qdbusargument.html I hope it helps > > _______________________________________________ > RAUC mailing list Diese E-Mail kann vertrauliche und/oder rechtlich gesch?tzte In= formationen beinhalten und ist ausschlie?lich f?r die im Verteiler genannte= n Personen bestimmt. Das unerlaubte Kopieren sowie die unbefugte Weitergabe dieser Mail sind nicht gestattet. Bitte ben= achrichtigen Sie uns gegebenenfalls telefonisch oder mit Antwort-Mail, fall= s Sie nicht der richtige Adressat dieser E-Mail sind. Bitte l?schen Sie die= se Nachricht und alle Anh?nge dazu unverz?glich. Falls nicht ausdr?cklich vermerkt, ist diese E-Mail keine re= chtlich bindende Vereinbarung. Kommanditgesellschaft: JUMO GmbH & Co. KG, Sitz: 36039 Fulda, Amtsgeric= ht Fulda HRA 302, Pers?nlich haftende Gesellschafterin: M. K. JUCHHEIM GmbH= , Sitz: 36039 Fulda, Amtsgericht Fulda HRB 17, Gesch?ftsf?hrer: Dipl.-Ing. = Bernhard Juchheim, Dipl.-Kfm. Michael Juchheim, Dipl.-Ing. Dimitrios Charisiadis Ust.-Id.-Nr.: DE 112411234