singleapplication.cpp
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singleapplication.cpp
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	#include "singleapplication.h"
	#include <cstdlib>

	/**
	* @brief Constructor. Checks and fires up LocalServer or closes the program
	* if another instance already exists
	* @param argc
	* @param argv
	*/
	SingleApplication::SingleApplication(int argc, char *argv[])
	: QApplication(argc, argv)
	{
	QString serverName = QApplication::organizationName() + QApplication::applicationName();
	serverName.replace(QRegExp("[^\\w\\-. ]"), "");

	// Attempt to connect to the LocalServer
	socket = new QLocalSocket();
	socket->connectToServer(serverName);
	if(socket->waitForConnected(1000)){
	socket->close();
	::exit(EXIT_SUCCESS); // Terminate the program using STDLib's exit function
	} else {
	// If the connection is insuccessful, this is the main process
	// So we create a Local Server
	server = new QLocalServer();
	server->removeServer(serverName);
	server->listen(serverName);
	QObject::connect(server, SIGNAL(newConnection()), this, SLOT(slotConnectionEstablished()));
	}
	}

	/**
	* @brief Destructor
	*/
	SingleApplication::~SingleApplication()
	{
	server->close();
	}

	/**
	* @brief Executed when the showUp command is sent to LocalServer
	*/
	void SingleApplication::slotConnectionEstablished()
	{
	server->nextPendingConnection();
	emit showUp();
	}