Re: [RAUC] Antwort: D-Bus control Qt
Hi Eugen,
I think I got it.
MyProgress.cpp:
Q_DECLARE_METATYPE(MyProgress)
QDBusArgument <<(QDBusArgument , const MyProgress&
parameterProgress)
{
argument.beginStructure();
argument << parameterProgress.m_Progress;
argument << parameterProgress.m_Message;
argument << parameterProgress.m_Additional;
argument.endStructure();
return argument;
}
const QDBusArgument >>(const QDBusArgument , MyProgress&
parameterProgress)
{
argument.beginStructure();
argument >> parameterProgress.m_Progress;
argument >> parameterProgress.m_Message;
argument >> parameterProgress.m_Additional;
argument.endStructure();
return argument;
}
MyProgress ::MyProgress(){
qRegisterMetaType();
qDBusRegisterMetaType();
}
MyProgress.h:
#ifndef MYPROGRESS_H
#define MYPROGRESS_H
#include
#include
#include
#include
class MyProgress
{
public:
MyProgress();
~MyProgress();
int m_Progress;
QString m_Message;
int m_Additional;
public slots:
friend QDBusArgument <<(QDBusArgument , const
RaucProgress );
friend const QDBusArgument >>(const QDBusArgument ,
RaucProgress );
};
#endif // MYPROGRESS_H
update.cpp:
...
QDBusInterface interface( "de.pengutronix.rauc",
"/",
"de.pengutronix.rauc.Installer",
QDBusConnection::systemBus() );
if (interface.isValid() == true)
{
qDebug() << "interface is valid";
qDebug() << "Read property (Progress)";
QVariant property = interface.property("Progress");
property.value() >> parameterProgress;
qDebug() << parameterProgress.m_Progress;
qDebug() << 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 QDBusArguments? I wount compile without it.
Many thanks.
Kind regards
Michael
____________________
Von: RAUC im Auftrag von Stahl, Michael
Gesendet: Montag, 2. August 2021 14:45
An: eugen.wi...@jumo.net
Cc: 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;
QDBusInterface interface( "de.pengutronix.rauc",
"/",
"de.pengutronix.rauc.Installer",
QDBusConnection::systemBus() );
QVariant property = interface.property("Progress");
property.value() >> parameterProgress;
No I get a compiler error:
no match for operator>>'(opernad types are 'QDBusArgument' and 'MyProgress')
I think I do the registration an the installing of the oparators wrong.
The registration is done in the constructor of MyProgress:
MyProgress ::MyProgress(){
qRegisterMetaType();
qDBusRegisterMetaType();
}
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?
QDBusArgument <<(QDBusArgument , const MyProgress&
parameterProgress);
const QDBusArgument >>(const QDBusArgument , MyProgress&
parameterProgress);
QDBusArgument <<(QDBusArgument , const MyProgress&
parameterProgress)
{
argument.beginStructure();
argument << parameterProgress.m_Progress;
argument << parameterProgress.m_Message;
argument << parameterProgress.m_Additional;
argument.endStructure();
return argument;
}
const QDBusArgument >>(const QDBusArgument , MyProgress&
parameterProgress)
{
argument.beginStructure();
argument >> parameterProgress.m_Progress;
argument >> parameterProgress.m_Message;
argument >> parameterProgress.m_Additional;
argument.endStructure();
return argument;
}
It seems like I am only a few millimeters away from my goal.
Thanks
Von: eugen.wi...@jumo.net
Gesendet: Montag, 2. August 2021 13:41
An: Stahl, Michael
Cc: RAUC@pengutronix.de
Betreff: Antwort: [RAUC] D-Bus control Qt
Hi Michael,
"RAUC" schrieb am 02.08.2021 08:15:26:
> Von: "Stahl, Michael"
> An: "RAUC@pengutronix.de"
> Datum: 02.08.2021 08:15
> Betreff: [RAUC] D-Bus control Qt
> Gesendet von: "RAUC"
>
> Is there someone who implemented the DBus Property "Progress" into a
> Qt-Application? The problem seems the return value isi (Inte
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;
QDBusInterface interface( "de.pengutronix.rauc",
"/",
"de.pengutronix.rauc.Installer",
QDBusConnection::systemBus() );
QVariant property = interface.property("Progress");
property.value() >> parameterProgress;
No I get a compiler error:
no match for operator>>'(opernad types are 'QDBusArgument' and 'MyProgress')
I think I do the registration an the installing of the oparators wrong.
The registration is done in the constructor of MyProgress:
MyProgress ::MyProgress(){
qRegisterMetaType();
qDBusRegisterMetaType();
}
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?
QDBusArgument <<(QDBusArgument , const MyProgress&
parameterProgress);
const QDBusArgument >>(const QDBusArgument , MyProgress&
parameterProgress);
QDBusArgument <<(QDBusArgument , const MyProgress&
parameterProgress)
{
argument.beginStructure();
argument << parameterProgress.m_Progress;
argument << parameterProgress.m_Message;
argument << parameterProgress.m_Additional;
argument.endStructure();
return argument;
}
const QDBusArgument >>(const QDBusArgument , MyProgress&
parameterProgress)
{
argument.beginStructure();
argument >> parameterProgress.m_Progress;
argument >> parameterProgress.m_Message;
argument >> parameterProgress.m_Additional;
argument.endStructure();
return argument;
}
It seems like I am only a few millimeters away from my goal.
Thanks
Von: eugen.wi...@jumo.net
Gesendet: Montag, 2. August 2021 13:41
An: Stahl, Michael
Cc: RAUC@pengutronix.de
Betreff: Antwort: [RAUC] D-Bus control Qt
Hi Michael,
"RAUC" schrieb am 02.08.2021 08:15:26:
> Von: "Stahl, Michael"
> An: "RAUC@pengutronix.de"
> Datum: 02.08.2021 08:15
> Betreff: [RAUC] D-Bus control Qt
> Gesendet von: "RAUC"
>
> 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 value 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 read 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 marshaling the data.
1. Create a Data Class
#include
#include
#include
class MyProgress
{
public:
[...]
int m_Progress;
QString m_Message;
int m_Additional;
};
// this is one of the magic statements
Q_DECLARE_METATYPE(MyProgress)
QDBusArgument <<(QDBusArgument , const MyProgress&
parameterProgress);
const QDBusArgument >>(const QDBusArgument , MyProgress&
parameterProgress);
};
You has to register the metatype and implement the operators. In the
Constructor you has to add two register Methods
qRegisterMetaType();
qDBusRegisterMetaType();
After this tree registrations your Class MyProgress is known by Qt Metatype
System. Now you has to implement operators
QDBusArgument <<(QDBusArgument , const MyProgress&
parameterProgress)
{
argument.beginStructure();
argument << parameterProgress.m_Progress;
argument << parameterProgress.m_Message;
argument << parameterProgress.m_Additional;
argument.endStructure();
return argument;
}
const QDBusArgument >>(const QDBusArgument , MyProgress&
parameterProgress)
{
argument.beginStructure();
argument >> parameterProgress.m_Progress;
argument >> parameterProgress.m_Message;
argument >> parameterProgress.m_Additional;
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() >> parameterProgress;
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 Informationen
