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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("\\s"), "");
// 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();
}
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