1 /****************************************************************************
3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
4 ** All rights reserved.
6 ** Contact: Nokia Corporation (qt-info@nokia.com)
8 ** This file is part of a Qt Solutions component.
10 ** You may use this file under the terms of the BSD license as follows:
12 ** "Redistribution and use in source and binary forms, with or without
13 ** modification, are permitted provided that the following conditions are
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
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
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."
38 ****************************************************************************/
40 /*! \page qtsingleapplication-example-trivial.html
41 \title A Trivial Example
43 The application in this example has a log-view that displays
44 messages sent by further instances of the same application.
46 The example demonstrates the use of the QtSingleApplication
47 class to detect and communicate with a running instance of
48 the application using the sendMessage() API. The messageReceived()
49 signal is used to display received messages in a QTextEdit log.
51 \quotefromfile trivial/main.cpp
53 The example has only the \c main entry point function.
54 A QtSingleApplication object is created immediately.
57 If another instance of this application is already running,
58 sendMessage() will succeed, and this instance just exits
62 Otherwise the instance continues as normal and creates the
65 \printuntil return instance.exec();
66 The \c logview object is also set as the application's activation
67 window. Every time a message is received, the window will be raised
68 and activated automatically.
70 The messageReceived() signal is also connected to the QTextEdit's
71 append() slot. Every message received from further instances of
72 this application will be displayed in the log.
74 Finally the event loop is entered.