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1 | /**************************************************************************** |
2 | ** | |
3 | ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies). | |
4 | ** All rights reserved. | |
5 | ** | |
6 | ** Contact: Nokia Corporation (qt-info@nokia.com) | |
7 | ** | |
8 | ** This file is part of a Qt Solutions component. | |
9 | ** | |
10 | ** You may use this file under the terms of the BSD license as follows: | |
11 | ** | |
12 | ** "Redistribution and use in source and binary forms, with or without | |
13 | ** modification, are permitted provided that the following conditions are | |
14 | ** met: | |
15 | ** * Redistributions of source code must retain the above copyright | |
16 | ** notice, this list of conditions and the following disclaimer. | |
17 | ** * Redistributions in binary form must reproduce the above copyright | |
18 | ** notice, this list of conditions and the following disclaimer in | |
19 | ** the documentation and/or other materials provided with the | |
20 | ** distribution. | |
21 | ** * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor | |
22 | ** the names of its contributors may be used to endorse or promote | |
23 | ** products derived from this software without specific prior written | |
24 | ** permission. | |
25 | ** | |
26 | ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | |
27 | ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | |
28 | ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR | |
29 | ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT | |
30 | ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | |
31 | ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT | |
32 | ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, | |
33 | ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY | |
34 | ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT | |
35 | ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE | |
36 | ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE." | |
37 | ** | |
38 | ****************************************************************************/ | |
39 | ||
40 | ||
41 | #include "qtsinglecoreapplication.h" | |
42 | #include <QtCore/QDebug> | |
43 | ||
44 | ||
45 | void report(const QString& msg) | |
46 | { | |
47 | qDebug("[%i] %s", (int)QCoreApplication::applicationPid(), qPrintable(msg)); | |
48 | } | |
49 | ||
50 | class MainClass : public QObject | |
51 | { | |
52 | Q_OBJECT | |
53 | public: | |
54 | MainClass() | |
55 | : QObject() | |
56 | {} | |
57 | ||
58 | public slots: | |
59 | void handleMessage(const QString& message) | |
60 | { | |
61 | report( "Message received: \"" + message + "\""); | |
62 | } | |
63 | }; | |
64 | ||
65 | int main(int argc, char **argv) | |
66 | { | |
67 | report("Starting up"); | |
68 | ||
69 | QtSingleCoreApplication app(argc, argv); | |
70 | ||
71 | if (app.isRunning()) { | |
72 | QString msg(QString("Hi master, I am %1.").arg(QCoreApplication::applicationPid())); | |
73 | bool sentok = app.sendMessage(msg, 2000); | |
74 | QString rep("Another instance is running, so I will exit."); | |
75 | rep += sentok ? " Message sent ok." : " Message sending failed; the other instance may be frozen."; | |
76 | report(rep); | |
77 | return 0; | |
78 | } else { | |
79 | report("No other instance is running; so I will."); | |
80 | MainClass mainObj; | |
81 | QObject::connect(&app, SIGNAL(messageReceived(const QString&)), | |
82 | &mainObj, SLOT(handleMessage(const QString&))); | |
83 | return app.exec(); | |
84 | } | |
85 | } | |
86 | ||
87 | ||
88 | #include "main.moc" |