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Implement "Application instances manager"

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Vladimir Golovnev (Glassez) 2019-02-08 11:15:09 +03:00
parent c0557c296a
commit c7f3693ad1
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25 changed files with 163 additions and 863 deletions
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src/app/applicationinstancemanager.cpp Normal file
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/*
* Bittorrent Client using Qt and libtorrent.
* Copyright (C) 2019 Vladimir Golovnev <glassez@yandex.ru>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* In addition, as a special exception, the copyright holders give permission to
* link this program with the OpenSSL project's "OpenSSL" library (or with
* modified versions of it that use the same license as the "OpenSSL" library),
* and distribute the linked executables. You must obey the GNU General Public
* License in all respects for all of the code used other than "OpenSSL". If you
* modify file(s), you may extend this exception to your version of the file(s),
* but you are not obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
#include "applicationinstancemanager.h"
#ifdef Q_OS_WIN
#include <windows.h>
#endif
#include <QDebug>
#include <QSharedMemory>
#include "qtlocalpeer/qtlocalpeer.h"
ApplicationInstanceManager::ApplicationInstanceManager(const QString &appId, QObject *parent)
: QObject {parent}
, m_peer {new QtLocalPeer {this, appId}}
, m_isFirstInstance {!m_peer->isClient()}
{
connect(m_peer, &QtLocalPeer::messageReceived, this, &ApplicationInstanceManager::messageReceived);
#ifdef Q_OS_WIN
auto sharedMem = new QSharedMemory {appId + QLatin1String {"-shared-memory-key"}, this};
if (m_isFirstInstance) {
// First instance creates shared memory and store PID
if (sharedMem->create(sizeof(DWORD)) && sharedMem->lock()) {
*(static_cast<DWORD *>(sharedMem->data())) = ::GetCurrentProcessId();
sharedMem->unlock();
}
}
else {
// Later instances attach to shared memory and retrieve PID
if (sharedMem->attach() && sharedMem->lock()) {
::AllowSetForegroundWindow(*(static_cast<DWORD *>(sharedMem->data())));
sharedMem->unlock();
}
}
if (!sharedMem->isAttached())
qCritical() << "Failed to initialize shared memory: " << sharedMem->errorString();
#endif
}
bool ApplicationInstanceManager::isFirstInstance() const
{
return m_isFirstInstance;
}
bool ApplicationInstanceManager::sendMessage(const QString &message, const int timeout)
{
return m_peer->sendMessage(message, timeout);
}
QString ApplicationInstanceManager::appId() const
{
return m_peer->applicationId();
}