qBittorrent
applicationinstancemanager.cpp
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1 /*
2  * Bittorrent Client using Qt and libtorrent.
3  * Copyright (C) 2019 Vladimir Golovnev <glassez@yandex.ru>
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License
7  * as published by the Free Software Foundation; either version 2
8  * of the License, or (at your option) any later version.
9  *
10  * This program is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13  * GNU General Public License for more details.
14  *
15  * You should have received a copy of the GNU General Public License
16  * along with this program; if not, write to the Free Software
17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
18  *
19  * In addition, as a special exception, the copyright holders give permission to
20  * link this program with the OpenSSL project's "OpenSSL" library (or with
21  * modified versions of it that use the same license as the "OpenSSL" library),
22  * and distribute the linked executables. You must obey the GNU General Public
23  * License in all respects for all of the code used other than "OpenSSL". If you
24  * modify file(s), you may extend this exception to your version of the file(s),
25  * but you are not obligated to do so. If you do not wish to do so, delete this
26  * exception statement from your version.
27  */
28 
30 
31 #include <QtGlobal>
32 
33 #ifdef Q_OS_WIN
34 #include <windows.h>
35 
36 #include <QDebug>
37 #include <QSharedMemory>
38 #endif
39 
41 
42 ApplicationInstanceManager::ApplicationInstanceManager(const QString &instancePath, QObject *parent)
43  : QObject {parent}
44  , m_peer {new QtLocalPeer {instancePath, this}}
45  , m_isFirstInstance {!m_peer->isClient()}
46 {
48 
49 #ifdef Q_OS_WIN
50  const QString sharedMemoryKey = instancePath + QLatin1String {"/shared-memory"};
51  auto sharedMem = new QSharedMemory {sharedMemoryKey, this};
53  {
54  // First instance creates shared memory and store PID
55  if (sharedMem->create(sizeof(DWORD)) && sharedMem->lock())
56  {
57  *(static_cast<DWORD *>(sharedMem->data())) = ::GetCurrentProcessId();
58  sharedMem->unlock();
59  }
60  }
61  else
62  {
63  // Later instances attach to shared memory and retrieve PID
64  if (sharedMem->attach() && sharedMem->lock())
65  {
66  ::AllowSetForegroundWindow(*(static_cast<DWORD *>(sharedMem->data())));
67  sharedMem->unlock();
68  }
69  }
70 
71  if (!sharedMem->isAttached())
72  qCritical() << "Failed to initialize shared memory: " << sharedMem->errorString();
73 #endif
74 }
75 
77 {
78  return m_isFirstInstance;
79 }
80 
81 bool ApplicationInstanceManager::sendMessage(const QString &message, const int timeout)
82 {
83  return m_peer->sendMessage(message, timeout);
84 }
void messageReceived(const QString &message)
bool sendMessage(const QString &message, int timeout=5000)
ApplicationInstanceManager(const QString &instancePath, QObject *parent=nullptr)
void messageReceived(const QString &message)
bool sendMessage(const QString &message, int timeout)