2010-11-20 13:43:55 +00:00
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< head >
< title > A non-GUI example< / title >
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< / tr > < / table > < h1 class = "title" > A non-GUI example< br / > < span class = "subtitle" > < / span >
< / h1 >
< p > This example shows how to use the single-application functionality in a console application. It does not require the < tt > QtGui< / tt > library at all.< / p >
< p > The only differences from the GUI application usage demonstrated in the other examples are:< / p >
< p > 1) The < tt > .pro< / tt > file should include < tt > qtsinglecoreapplication.pri< / tt > instead of < tt > qtsingleapplication.pri< / tt > < / p >
< p > 2) The class name is < tt > QtSingleCoreApplication< / tt > instead of < tt > QtSingleApplication< / tt > .< / p >
< p > 3) No calls are made regarding window activation, for obvious reasons.< / p >
< p > console.pro:< / p >
< pre > TEMPLATE = app
CONFIG += console
SOURCES += main.cpp
include(../../src/qtsinglecoreapplication.pri)
QT -= gui< / pre >
< p > main.cpp:< / p >
< pre > < span class = "comment" > /****************************************************************************
**
2013-02-03 21:00:15 +00:00
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
2010-11-20 13:43:55 +00:00
**
2013-02-03 21:00:15 +00:00
** This file is part of the Qt Solutions component.
2010-11-20 13:43:55 +00:00
**
** You may use this file under the terms of the BSD license as follows:
**
** " Redistribution and use in source and binary forms, with or without
** modification, are permitted provided that the following conditions are
** met:
** * Redistributions of source code must retain the above copyright
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****************************************************************************/< / span >
#include " qtsinglecoreapplication.h"
#include < QtCore/QDebug>
void report(const QString& msg)
{
qDebug(" [%i] %s" , (int)QCoreApplication::applicationPid(), qPrintable(msg));
}
class MainClass : public QObject
{
Q_OBJECT
public:
MainClass()
: QObject()
{}
public slots:
void handleMessage(const QString& message)
{
report( " Message received: \" " + message + " \" " );
}
};
int main(int argc, char **argv)
{
report(" Starting up" );
QtSingleCoreApplication app(argc, argv);
if (app.isRunning()) {
QString msg(QString(" Hi master, I am %1." ).arg(QCoreApplication::applicationPid()));
bool sentok = app.sendMessage(msg, 2000);
QString rep(" Another instance is running, so I will exit." );
rep += sentok ? " Message sent ok." : " Message sending failed; the other instance may be frozen." ;
report(rep);
return 0;
} else {
report(" No other instance is running; so I will." );
MainClass mainObj;
QObject::connect(& app, SIGNAL(messageReceived(const QString& )),
& mainObj, SLOT(handleMessage(const QString& )));
return app.exec();
}
}
#include " main.moc" < / pre >
< p / > < address > < hr / > < div align = "center" >
< table width = "100%" cellspacing = "0" border = "0" > < tr class = "address" >
< td width = "30%" align = "left" > Copyright © 2010 Nokia Corporation and/or its subsidiary(-ies)< / td >
< td width = "40%" align = "center" > < a href = "http://qt.nokia.com/doc/trademarks.html" > Trademarks< / a > < / td >
< td width = "30%" align = "right" > < div align = "right" > Qt Solutions< / div > < / td >
< / tr > < / table > < / div > < / address > < / body >
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