免费查公司的网站,网站的建设维护及管理制度,什么网站可以做英语题,设计本官方网站案例QLocalSocket QLocalServer
逻辑#xff1a;首先一个新的实例启动时#xff0c;将尝试连接到同一个本地服务器#xff0c;如果连接失败#xff0c;则表示第一个实例进程#xff0c;创建一个本地服务器#xff1b;否则#xff0c;拉起已打开的实例进程。
main.cpp
#i…QLocalSocket QLocalServer
逻辑首先一个新的实例启动时将尝试连接到同一个本地服务器如果连接失败则表示第一个实例进程创建一个本地服务器否则拉起已打开的实例进程。
main.cpp
#include QApplication
#include main_windows.h
#include single_application.h//QT启动屏蔽cmd
#pragma comment(linker, /subsystem:\windows\ /entry:\mainCRTStartup\)int main(int argc, char* argv[])
{//QApplication a(argc, argv);SingleApplication singleApplication(argc, argv);if (!singleApplication.IsRunning()){MainWindow mainWindow;mainWindow.show();singleApplication.m_mainWindow mainWindow;return SingleApplication::exec();}return 0;
}single_application.h
//
// Created by zhe.xiao on 2024/3/1.
//#pragma once#include QApplication
#include QWidget
#include QLocalServer
#include QLocalSocketclass SingleApplication : public QApplication
{
Q_OBJECT
public:SingleApplication(int argc, char* argv[]);//是否已有实例在运行bool IsRunning();private://初始化本地连接void InitLocalConnection();//创建服务端void CreateLocalServer();//激活窗口void ActivateWindow();public://MainWindow指针QWidget* m_mainWindow;private://运行状态bool m_isRunning;//是否已有实例在运行QLocalServer* m_localserver;//本地socket ServerQString m_applicationName;//连接超时时间int m_timeout 1000;private slots://有新连接时触发void OnNewConnection();
};
single_application.cpp
//
// Created by zhe.xiao on 2024/3/1.
//#include QFileInfo
#include single_application.h
#include QDebugSingleApplication::SingleApplication(int argc, char* argv[]) : QApplication(argc, argv)
{m_isRunning false;m_mainWindow nullptr;m_localserver nullptr;m_applicationName QFileInfo(QApplication::applicationFilePath()).fileName();qDebug() m_serverName: m_applicationName;InitLocalConnection();
}/*** 通过socket通讯实现程序单实例运行* 初始化本地连接如果连接不上server则创建否则退出*/
void SingleApplication::InitLocalConnection()
{m_isRunning false;//尝试连接本地服务器如果连上了就触发OnNewConnectionQLocalSocket socket;socket.connectToServer(m_applicationName);if (socket.waitForConnected(m_timeout)){m_isRunning true;return;}//首次打开exe连接不上则需要先创建一个本地服务器CreateLocalServer();
}void SingleApplication::CreateLocalServer()
{m_localserver new QLocalServer(this);connect(m_localserver, QLocalServer::newConnection, this, SingleApplication::OnNewConnection);if (!m_localserver-listen(m_applicationName)){// 此时监听失败,可能是程序崩溃时,残留进程服务导致的,移除if (m_localserver-serverError() QAbstractSocket::AddressInUseError){QLocalServer::removeServer(m_applicationName);m_localserver-listen(m_applicationName); //重新监听}}
}/*** 通过socket通讯实现程序单实例运行,监听到新的连接【即重新双击exe】时触发该函数.*/
void SingleApplication::OnNewConnection()
{QLocalSocket* localSocket m_localserver-nextPendingConnection();if (localSocket){localSocket-waitForReadyRead(m_timeout * 2);delete localSocket;//激活窗口ActivateWindow();}
}void SingleApplication::ActivateWindow()
{if (m_mainWindow ! nullptr){m_mainWindow-raise();m_mainWindow-showNormal();m_mainWindow-activateWindow();}
}bool SingleApplication::IsRunning()
{return m_isRunning;
}
