src_qdbus_qdbusabstractinterface.cpp

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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
 
#include <QString>
#include <QDBusMessage>
#include <QDBusReply>
#include <QDBusInterface>
 
using namespace Qt::StringLiterals;
 
class Abstract_DBus_Interface : public QObject
{
    Q_OBJECT
 
public:
    Abstract_DBus_Interface(QObject *parent = nullptr)
    : QObject(parent) {
        interface = new QDBusInterface("org.example.Interface", "/Example/Methods");
    }
 
    ~Abstract_DBus_Interface() {  delete interface; }
    void interfaceMain();
    void asyncCall();
    QString retrieveValue() { return QString(); }
 
public slots:
    void callFinishedSlot();
 
private:
    QDBusInterface *interface;
};
 
void Abstract_DBus_Interface::interfaceMain()
{
//! [0]
QString value = retrieveValue();
QDBusMessage reply;
 
QDBusReply<int> api = interface->call("GetAPIVersion"_L1);
if (api >= 14)
  reply = interface->call("ProcessWorkUnicode"_L1, value);
else
  reply = interface->call("ProcessWork"_L1, "UTF-8"_L1, value.toUtf8());
//! [0]
}
 
void Abstract_DBus_Interface::asyncCall()
{
//! [1]
QDBusPendingCall pcall = interface->asyncCall("GetAPIVersion"_L1);
auto watcher = new QDBusPendingCallWatcher(pcall, this);
 
QObject::connect(watcher, &QDBusPendingCallWatcher::finished, this,
                 [&](QDBusPendingCallWatcher *w) {
    QString value = retrieveValue();
    QDBusPendingReply<int> reply(*w);
    QDBusPendingCall pcall;
    if (reply.argumentAt<0>() >= 14)
        pcall = interface->asyncCall("ProcessWorkUnicode"_L1, value);
    else
        pcall = interface->asyncCall("ProcessWork"_L1, "UTF-8"_L1, value.toUtf8());
 
    w = new QDBusPendingCallWatcher(pcall);
    QObject::connect(w,  &QDBusPendingCallWatcher::finished, this,
                     &Abstract_DBus_Interface::callFinishedSlot);
});
//! [1]
}