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#include <QLocalSocket>
#include "singleapplication.h"
/**
* @brief SingleApplication::SingleApplication
* @param argc
* @param argv
* @param uniqueKey
*/
SingleApplication::SingleApplication(int &argc, char *argv[], const QString uniqueKey) : QApplication(argc, argv), _uniqueKey(uniqueKey)
{
sharedMemory.setKey(_uniqueKey);
if (sharedMemory.attach())
_isRunning = true;
else
{
_isRunning = false;
// create shared memory.
if (!sharedMemory.create(1))
{
qDebug("Unable to create single instance.");
return;
}
// create local server and listen to incomming messages from other instances.
localServer.reset(new QLocalServer(this));
connect(localServer.data(), SIGNAL(newConnection()), this, SLOT(receiveMessage()));
localServer->listen(_uniqueKey);
}
}
// public slots.
/**
* @brief SingleApplication::receiveMessage
*/
void SingleApplication::receiveMessage()
{
QLocalSocket *localSocket = localServer->nextPendingConnection();
if (!localSocket->waitForReadyRead(timeout))
{
qDebug() << localSocket->errorString().toLatin1();
return;
}
QByteArray byteArray = localSocket->readAll();
QString message = QString::fromUtf8(byteArray.constData());
emit messageAvailable(message);
localSocket->disconnectFromServer();
}
// public functions.
/**
* @brief SingleApplication::isRunning
* @return
*/
bool SingleApplication::isRunning()
{
return _isRunning;
}
/**
* @brief SingleApplication::sendMessage
* @param message
* @return
*/
bool SingleApplication::sendMessage(const QString &message)
{
if (!_isRunning)
return false;
QLocalSocket localSocket(this);
localSocket.connectToServer(_uniqueKey, QIODevice::WriteOnly);
if (!localSocket.waitForConnected(timeout))
{
qDebug() << localSocket.errorString().toLatin1();
return false;
}
localSocket.write(message.toUtf8());
if (!localSocket.waitForBytesWritten(timeout))
{
qDebug() << localSocket.errorString().toLatin1();
return false;
}
localSocket.disconnectFromServer();
return true;
}
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