remove localsocket, check if process is already running with tasklist…

… instead

BigPictureTV.pro

@@ -1,4 +1,4 @@
-QT += core gui network
+QT += core gui
 
 greaterThan(QT_MAJOR_VERSION, 4): QT += widgets
 

Utils/Utils.cpp

@@ -1,4 +1,5 @@
 #include "Utils.h"
+#include <QTranslator>
 #include <QApplication>
 #include <QScreen>
 #include <QDebug>

main.cpp

@@ -1,52 +1,45 @@
 #include <QApplication>
 #include <QDebug>
 #include <QLocale>
-#include <QMessageBox>
-#include <QLocalServer>
-#include <QLocalSocket>
 #include <QString>
 #include <QTranslator>
+#include <QProcess>
 #include "BigPictureTV.h"
 #include "Utils.h"
 
-int main(int argc, char *argv[])
+bool isAnotherInstanceRunning(const QString& processName)
 {
-    QApplication a(argc, argv);
-
-    QString serverName = "BigPictureTVUniqueIdentifier";
-    QLocalServer localServer;
-    QLocalSocket localSocket;
+    QProcess process;
+    process.start("tasklist", QStringList() << "/FI" << QString("IMAGENAME eq %1").arg(processName));
+    process.waitForFinished();
+    QString output = process.readAllStandardOutput();
+    int count = output.count(processName, Qt::CaseInsensitive);
 
-    localSocket.connectToServer(serverName);
+    return count > 1;
+}
 
-    if (localSocket.waitForConnected(500)) {
-        qDebug() << "Another instance is already running.";
-        return 0;
+int main(int argc, char *argv[])
+{
+    QApplication a(argc, argv);
+    a.setQuitOnLastWindowClosed(false);
+    if (Utils::isWindows10()) {
+        a.setStyle("fusion");
     }
 
-    if (!localServer.listen(serverName)) {
-        qDebug() << "Unable to start the local server:" << localServer.errorString();
-        return 1;
+    const QString processName = "BigPictureTV.exe";
+    if (isAnotherInstanceRunning(processName)) {
+        qDebug() << "Another instance is already running. Exiting...";
+        return 0;
     }
 
     QLocale locale;
     QString languageCode = locale.name().section('_', 0, 0);
     QTranslator translator;
-
     if (translator.load(":/translations/BigPictureTV_" + languageCode + ".qm")) {
         a.installTranslator(&translator);
     }
 
-    if (Utils::isWindows10()) {
-        a.setStyle("fusion");
-    }
-    a.setQuitOnLastWindowClosed(false);
-
     BigPictureTV w;
 
-    QObject::connect(&a, &QApplication::aboutToQuit, [&localServer]() {
-        localServer.close();
-    });
-
     return a.exec();
 }