gui: single instance mode.

3rd/SingleApplication-3.5.2/examples/sending_arguments/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.7.0)
+
+project(sending_arguments LANGUAGES CXX)
+
+set(CMAKE_AUTOMOC ON)
+
+# SingleApplication base class
+set(QAPPLICATION_CLASS QCoreApplication)
+add_subdirectory(../.. SingleApplication)
+
+find_package(Qt${QT_DEFAULT_MAJOR_VERSION} COMPONENTS Core REQUIRED)
+
+add_executable(${PROJECT_NAME}
+    main.cpp
+    messagereceiver.cpp
+    messagereceiver.h
+    main.cpp
+)
+
+target_link_libraries(${PROJECT_NAME} SingleApplication::SingleApplication)

3rd/SingleApplication-3.5.2/examples/sending_arguments/main.cpp

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+// Copyright (c) Itay Grudev 2015 - 2023
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// Permission is not granted to use this software or any of the associated files
+// as sample data for the purposes of building machine learning models.
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#include <singleapplication.h>
+#include "messagereceiver.h"
+
+int main(int argc, char *argv[])
+{
+    // Allow secondary instances
+    SingleApplication app( argc, argv, true );
+
+    MessageReceiver msgReceiver;
+
+    // If this is a secondary instance
+    if( app.isSecondary() ) {
+        app.sendMessage( app.arguments().join(' ').toUtf8() );
+        qDebug() << "App already running.";
+        qDebug() << "Primary instance PID: " << app.primaryPid();
+        qDebug() << "Primary instance user: " << app.primaryUser();
+        return 0;
+    } else {
+        QObject::connect(
+            &app,
+            &SingleApplication::receivedMessage,
+            &msgReceiver,
+            &MessageReceiver::receivedMessage
+        );
+    }
+
+    return app.exec();
+}

3rd/SingleApplication-3.5.2/examples/sending_arguments/messagereceiver.cpp

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+// Copyright (c) Itay Grudev 2015 - 2023
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// Permission is not granted to use this software or any of the associated files
+// as sample data for the purposes of building machine learning models.
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#include <QDebug>
+#include "messagereceiver.h"
+
+MessageReceiver::MessageReceiver(QObject *parent) : QObject(parent)
+{
+}
+
+void MessageReceiver::receivedMessage(int instanceId, QByteArray message)
+{
+    qDebug() << "Received message from instance: " << instanceId;
+    qDebug() << "Message Text: " << message;
+}

3rd/SingleApplication-3.5.2/examples/sending_arguments/messagereceiver.h

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+// Copyright (c) Itay Grudev 2015 - 2023
+//
+// Permission is hereby granted, free of charge, to any person obtaining a copy
+// of this software and associated documentation files (the "Software"), to deal
+// in the Software without restriction, including without limitation the rights
+// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+// copies of the Software, and to permit persons to whom the Software is
+// furnished to do so, subject to the following conditions:
+//
+// Permission is not granted to use this software or any of the associated files
+// as sample data for the purposes of building machine learning models.
+//
+// The above copyright notice and this permission notice shall be included in
+// all copies or substantial portions of the Software.
+//
+// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+// THE SOFTWARE.
+
+#ifndef MESSAGERECEIVER_H
+#define MESSAGERECEIVER_H
+
+#include <QObject>
+
+class MessageReceiver : public QObject
+{
+    Q_OBJECT
+public:
+    explicit MessageReceiver(QObject *parent = 0);
+public slots:
+    void receivedMessage( int instanceId, QByteArray message );
+};
+
+#endif // MESSAGERECEIVER_H

3rd/SingleApplication-3.5.2/examples/sending_arguments/sending_arguments.pro

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+# Single Application implementation
+include(../../singleapplication.pri)
+DEFINES += QAPPLICATION_CLASS=QCoreApplication
+
+SOURCES += main.cpp \
+    messagereceiver.cpp
+
+HEADERS += \
+    messagereceiver.h