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Enable app class independent usage (#203)
This is a pure extension and fully backwards compatible. * Adds support for running it as a pre-compiled library while still being able to choose my `QXxxApplication` class at build time. * Be able to decide at runtime whether to use the single instance stuff (without starting a server and so on).
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| Original file line number | Diff line number | Diff line change |
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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. | ||
|
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| #ifndef FREE_STANDING_SINGLE_APPLICATION_H | ||
| #define FREE_STANDING_SINGLE_APPLICATION_H | ||
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| #include <QCoreApplication> | ||
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| /** | ||
| * @brief Fake Qt application base class | ||
| * Use this as base if you want to use SingleApplication as a free standing object that must be | ||
| * explicitly instanciated after your Qt application object. | ||
| * | ||
| * This enables you to use SingleApplication as a precompiled library and/or to decide at runtime | ||
| * if you want to use a SingleApplication instance or not. | ||
| */ | ||
| struct FreeStandingSingleApplication: QObject{ | ||
| FreeStandingSingleApplication( int&, char** ) {} | ||
| }; | ||
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| #endif |
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| include(CMakeFindDependencyMacro) | ||
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| find_dependency(Qt@QT_DEFAULT_MAJOR_VERSION@ COMPONENTS Core Network REQUIRED) | ||
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| include("${CMAKE_CURRENT_LIST_DIR}/SingleApplicationTargets.cmake") |
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| cmake_minimum_required(VERSION 3.7.0) | ||
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| project(separate_object LANGUAGES CXX) | ||
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| set(CMAKE_AUTOMOC ON) | ||
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| # SingleApplication base class | ||
| set(QAPPLICATION_CLASS FreeStandingSingleApplication) | ||
| add_subdirectory(../.. SingleApplication) | ||
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| find_package(Qt${QT_DEFAULT_MAJOR_VERSION} COMPONENTS Core REQUIRED) | ||
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| add_executable(${PROJECT_NAME} | ||
| main.cpp | ||
| messagereceiver.cpp | ||
| messagereceiver.h | ||
| main.cpp | ||
| ) | ||
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| target_link_libraries(${PROJECT_NAME} SingleApplication::SingleApplication) |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,53 @@ | ||
| // 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. | ||
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| #include <singleapplication.h> | ||
| #include "messagereceiver.h" | ||
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| int main(int argc, char *argv[]) | ||
| { | ||
| QCoreApplication app( argc, argv ); | ||
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| // Separate single instance object (that allows secondary instances) | ||
| SingleApplication single_instance_guard( argc, argv, true ); | ||
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| MessageReceiver msgReceiver; | ||
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| // If this is a secondary instance | ||
| if( single_instance_guard.isSecondary() ) { | ||
| single_instance_guard.sendMessage( app.arguments().join(' ').toUtf8() ); | ||
| qDebug() << "App already running."; | ||
| qDebug() << "Primary instance PID: " << single_instance_guard.primaryPid(); | ||
| qDebug() << "Primary instance user: " << single_instance_guard.primaryUser(); | ||
| return 0; | ||
| } else { | ||
| QObject::connect( | ||
| &single_instance_guard, | ||
| &SingleApplication::receivedMessage, | ||
| &msgReceiver, | ||
| &MessageReceiver::receivedMessage | ||
| ); | ||
| } | ||
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| return app.exec(); | ||
| } |
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