手机主页哪个网站好,给你一个网站怎么优化,wordpress 文章空格,微商城开发设计原本项目中使用QSharedMemory的方法来判断当前是否已存在运行的实例#xff0c;但在MacOS上#xff0c;当程序异常崩溃后#xff0c;QSharedMemory没有被正常销毁#xff0c;导致应用程序无法再次被打开。 对此#xff0c;Qt assistant中有相关说明#xff1a; 摘抄 qt-s… 原本项目中使用QSharedMemory的方法来判断当前是否已存在运行的实例但在MacOS上当程序异常崩溃后QSharedMemory没有被正常销毁导致应用程序无法再次被打开。 对此Qt assistant中有相关说明 摘抄 qt-solutions/qtsingleapplication at master · qtproject/qt-solutions (github.com) 实现了一个single application的类记录下来
main.cpp
#include mainwindow.h
#include singleapplication.hint main(int argc, char *argv[])
{CSingleApplication a(argc, argv);if (a.isRunning()) {return 0;}MainWindow w;w.show();a.setActivationWindow(w);return a.exec();
}singleapplication.cpp
#include singleapplication.h
#include QFileInfo
#include QLocalSocket
#include QLocalServer
#include QWidgetCSingleApplication::CSingleApplication(int argc, char** argv): QApplication(argc, argv)
{m_strServerName QFileInfo(QCoreApplication::applicationFilePath()).fileName();initLocalConn();
}CSingleApplication::~CSingleApplication()
{}bool CSingleApplication::isRunning()
{return m_isRunning;
}void CSingleApplication::setActivationWindow(QWidget* w)
{m_pActivateWin w;
}void CSingleApplication::initLocalConn()
{m_isRunning false;QLocalSocket socket;socket.connectToServer(m_strServerName);if (socket.waitForConnected(200)) {m_isRunning true;return;}createLocalServer();
}void CSingleApplication::createLocalServer()
{m_pLocalServer new QLocalServer(this);connect(m_pLocalServer, QLocalServer::newConnection, this, CSingleApplication::onNewConnection);if (!m_pLocalServer-listen(m_strServerName)) {if (QAbstractSocket::AddressInUseError m_pLocalServer-serverError()) {QLocalServer::removeServer(m_strServerName);m_pLocalServer-listen(m_strServerName);}}
}void CSingleApplication::activateWindow()
{if (nullptr ! m_pActivateWin) {m_pActivateWin-show();m_pActivateWin-raise();m_pActivateWin-activateWindow();}
}void CSingleApplication::onNewConnection()
{if (nullptr m_pLocalServer) {return;}QLocalSocket* socket m_pLocalServer-nextPendingConnection();if (nullptr ! socket) {socket-waitForReadyRead(300);delete socket;activateWindow();}
}singleapplication.h
#ifndef CSINGLEAPPLICATION_H
#define CSINGLEAPPLICATION_H#include QApplicationclass QLocalServer;class CSingleApplication : public QApplication
{
public:CSingleApplication(int argc, char** argv);virtual ~CSingleApplication() override;public:bool isRunning();void setActivationWindow(QWidget* w);private:bool m_isRunning false;QWidget* m_pActivateWin nullptr;QString m_strServerName;QLocalServer* m_pLocalServer nullptr;void initLocalConn();void createLocalServer();void activateWindow();private slots:void onNewConnection();
};#endif // CSINGLEAPPLICATION_H
