117 lines
4.5 KiB
C++
117 lines
4.5 KiB
C++
/*
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* Copyright (C) 2019 Tianjin KYLIN Information Technology Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*
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*/
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#include "singleApplication.h"
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#include <QtNetwork/QLocalSocket>
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#include <QFileInfo>
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#define TIME_OUT (500) // 500ms
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SingleApplication::SingleApplication(int &argc, char **argv)
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: QApplication(argc, argv)
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, w(NULL)
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, _isRunning(false)
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, _localServer(NULL) {
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// 取应用程序名作为LocalServer的名字
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// Take the application name as the name of localserver
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_serverName = QFileInfo(QCoreApplication::applicationFilePath()).fileName() + QLatin1String(getenv("DISPLAY"));
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_initLocalConnection();
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}
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// 检查是否已經有一个实例在运行, true - 有实例运行， false - 没有实例运行
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// Check whether there is an instance running, true - there is an instance running, false - there is no instance running
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bool SingleApplication::isRunning() {
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return _isRunning;
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}
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// 通过socket通讯实现程序单实例运行，监听到新的连接时触发该函数
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// The single instance of the program is run through socket communication, which is triggered when listening to a new connection
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void SingleApplication::_newLocalConnection()
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{
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//返回下一个挂起的连接，作为连接的QLocalSocket对象。
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QLocalSocket *socket = _localServer->nextPendingConnection();
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if (socket) {
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//该函数将阻塞，直到可以读取数据并且发出readyRead（）信号为止。 该函数将在毫秒毫秒后超时； 默认超时为30000毫秒。
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// 如果有可供读取的数据，则该函数返回true；否则返回false 否则返回false（如果发生错误或操作超时）。
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socket->waitForReadyRead(2*TIME_OUT);
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//关闭socket
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delete socket;
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// 其他处理，如：读取启动参数
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// Other processing, such as reading start parameters
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_activateWindow();
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}
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}
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// 通过socket通讯实现程序单实例运行，
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// Through socket communication, the single instance of program can be run,
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// 初始化本地连接，如果连接不上server，则创建，否则退出
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// Initialize the local connection. If the server cannot be connected, create it. Otherwise, exit
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void SingleApplication::_initLocalConnection()
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{
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_isRunning = false;
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QLocalSocket socket;
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socket.connectToServer(_serverName);
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//建立链接，超时时间500ms
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if (socket.waitForConnected(TIME_OUT)) {
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fprintf(stderr, "%s already running.\n",
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_serverName.toLocal8Bit().constData());
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//有连接，改状态，直接返回
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_isRunning = true;
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// 其他处理，如：将启动参数发送到服务端
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// Other processing, such as sending startup parameters to the server
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return;
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}
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//连接不上服务器，就创建一个
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// If you can't connect to the server, create a
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_newLocalServer();
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}
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// 创建LocalServer
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// Create localserver
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void SingleApplication::_newLocalServer()
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{
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_localServer = new QLocalServer(this);
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//信号：每当有新的连接
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connect(_localServer, SIGNAL(newConnection()), this, SLOT(_newLocalConnection()));
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if (!_localServer->listen(_serverName)) {
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// 此时监听失败，可能是程序崩溃时,残留进程服务导致的,移除之
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// At this time, listening fails. It may be caused by the residual process service when the program crashes. Remove it
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if (_localServer->serverError() == QAbstractSocket::AddressInUseError) {
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QLocalServer::removeServer(_serverName); // <-- 重点 a key
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_localServer->listen(_serverName); // 再次监听
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// Monitor again
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}
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}
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}
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// 激活主窗口
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// Activate main window
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void SingleApplication::_activateWindow() {
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if (w) {
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w->show();
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w->raise();
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w->activateWindow(); // 激活窗口
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// Activate window
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}
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}
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