[Interest] Question about using QtDBus

[Rogers Nate]

On 09/03/2014 12:17 PM, Thiago Macieira wrote:
> On Wednesday 03 September 2014 15:03:05 Rogers Nate wrote:
>> QDBusError("org.freedesktop.DBus.Error.InvalidSignature", "Unexpected reply
>> signature: got "", expected "a(ss)"")
> This means the interface code knows that the reply should contain an array of 
> a structure containing a pair of strings, but the reply did not have that.
>
> Can you attach your generated adaptor file and your actual called function?


Here is the generated file...


------------------- Begin ServiceDataAdaptor.cpp ----------------------
/*
 * This file was generated by qdbusxml2cpp version 0.7
 * Command line was: qdbusxml2cpp ServiceData.xml -i ServiceData.h -i
ServiceErrorLogData.h -a ServiceDataAdaptor
 *
 * qdbusxml2cpp is Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
 *
 * This is an auto-generated file.
 * Do not edit! All changes made to it will be lost.
 */

#include "ServiceDataAdaptor.h"
#include <QtCore/QMetaObject>
#include <QtCore/QByteArray>
#include <QtCore/QList>
#include <QtCore/QMap>
#include <QtCore/QString>
#include <QtCore/QStringList>
#include <QtCore/QVariant>

/*
 * Implementation of adaptor class ServiceDataAdaptor
 */

ServiceDataAdaptor::ServiceDataAdaptor(QObject *parent)
    : QDBusAbstractAdaptor(parent)
{
    // constructor
    setAutoRelaySignals(true);
}

ServiceDataAdaptor::~ServiceDataAdaptor()
{
    // destructor
}

void ServiceDataAdaptor::serviceErrorLog()
{
    // handle method call com.GDM.ServiceData.serviceErrorLog
    QMetaObject::invokeMethod(parent(), "serviceErrorLog");
}
------------------- End ServiceDataAdaptor.cpp ----------------------

------------------- Begin ServiceDataAdaptor.h ----------------------
/*
 * This file was generated by qdbusxml2cpp version 0.7
 * Command line was: qdbusxml2cpp ServiceData.xml -i ServiceData.h -i
ServiceErrorLogData.h -a ServiceDataAdaptor
 *
 * qdbusxml2cpp is Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
 *
 * This is an auto-generated file.
 * This file may have been hand-edited. Look for HAND-EDIT comments
 * before re-generating it.
 */

#ifndef SERVICEDATAADAPTOR_H_1409751106
#define SERVICEDATAADAPTOR_H_1409751106

#include <QtCore/QObject>
#include <QtDBus/QtDBus>
#include "ServiceData.h"
#include "ServiceErrorLogData.h"
class QByteArray;
template<class T> class QList;
template<class Key, class Value> class QMap;
class QString;
class QStringList;
class QVariant;

/*
 * Adaptor class for interface com.GDM.ServiceData
 */
class ServiceDataAdaptor: public QDBusAbstractAdaptor
{
    Q_OBJECT
    Q_CLASSINFO("D-Bus Interface", "com.GDM.ServiceData")
    Q_CLASSINFO("D-Bus Introspection", ""
"  <interface name=\"com.GDM.ServiceData\">\n"
"    <method name=\"serviceErrorLog\"/>\n"
"  </interface>\n"
        "")
public:
    ServiceDataAdaptor(QObject *parent);
    virtual ~ServiceDataAdaptor();

public: // PROPERTIES
public Q_SLOTS: // METHODS
    void serviceErrorLog();
Q_SIGNALS: // SIGNALS
};

#endif
------------------- End ServiceDataAdaptor.h ----------------------






Here is the Service Data class that stores the array of objects I want
to return...


------------------------ Begin ServiceData.cpp ---------------------
#include "ServiceData.h"

ServiceData::ServiceData(QObject *parent) : QObject(parent)
{
    initVariables();

    new ServiceDataAdaptor(this);
    QDBusConnection connection = QDBusConnection::systemBus();

    if (!connection.interface()->isServiceRegistered("com.GDM.ServiceData"))
    {
        if (!connection.registerService("com.GDM.ServiceData"))
        {
            qFatal("Could not register com.GDM.ServiceData service!");
        }

        if (!connection.registerObject("/ServiceData", this))
        {
            qFatal("Could not register ServiceData object!");
        }
    }
}

void ServiceData::initVariables()
{
    ServiceErrorLogData tempData = ServiceErrorLogData("2/17   
11:14:40a", "64 95%");
    m_ServiceErrorLog.append(tempData);
    ServiceErrorLogData tempData2 = ServiceErrorLogData("2/5   
8:20:18a", "8L 53%");
    m_ServiceErrorLog.append(tempData2);
}

QList<ServiceErrorLogData> ServiceData::serviceErrorLog()
{
    return m_ServiceErrorLog;
}
-------------------------- End ServiceData.cpp ----------------------

------------------------ Begin ServiceData.h ------------------------
#ifndef SERVICEDATA_H
#define SERVICEDATA_H

#include <qt5/QtCore/QCoreApplication>
#include <qt5/QtDBus/QtDBus>
#include "ServiceErrorLogData.h"
#include "ServiceDataAdaptor.h"

class ServiceErrorLogData;

class ServiceData : public QObject
{
    Q_OBJECT
    Q_CLASSINFO("D-Bus Interface", "com.GDM.ServiceData")

public:
    explicit ServiceData(QObject *parent = 0);

public slots:
    QList<ServiceErrorLogData> serviceErrorLog();

private:
    void initVariables();

    QList<ServiceErrorLogData> m_ServiceErrorLog;
};

Q_DECLARE_METATYPE(QList<ServiceErrorLogData>)

#endif // SERVICEDATA_H
------------------------- End ServiceData.h -------------------------





Here is the process that is using the dbus interface to try and retrieve
the array of objects...


------------------------ Begin CanData.cpp ------------------------
#include <qt5/QtCore/QCoreApplication>
#include <qt5/QtDBus/QtDBus>
#include "CanData.h"
#include "ServiceErrorLogData.h"

CanData::CanData(QObject *parent) : QObject(parent)
{
    m_ServiceData = new com::GDM::ServiceData("com.GDM.ServiceData",
"/ServiceData", QDBusConnection::systemBus(), this);

    // Setup the timer
    m_Timer = new QTimer(this);
    connect(m_Timer, SIGNAL(timeout()), this, SLOT(generateTestData()));
    m_Timer->start(800);
}

void CanData::generateTestData()
{
    QDBusPendingReply<QList<ServiceErrorLogData> > logData =
m_ServiceData->serviceErrorLog();
    logData.waitForFinished();
    if (logData.isError())
    {
        qDebug() << logData.error();
    }
    QList<ServiceErrorLogData> tempData = logData.value();
    qDebug() << "Log Data Count: " << tempData.count();
}
------------------------ End CanData.cpp ------------------------

------------------------ Begin CanData.h ------------------------
#ifndef CANDATA_H
#define CANDATA_H

#include <qt5/QtDBus/QtDBus>
#include "ServiceDataInterface.h"

class CanData : public QObject
{
    Q_OBJECT

public:
    explicit CanData(QObject *parent = 0);

private slots:
    void generateTestData();

private:
    com::GDM::ServiceData *m_ServiceData;
    QTimer *m_Timer;
};

#endif // CANDATA_H
------------------------ End CanData.h ------------------------


Not sure if that is everything you wanted to see, or if it was too much
information.  Anyway, thanks again for the help!

Nate


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