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#include "QSignleApplication.h"
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#include <QMainWindow>
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#include <QtNetwork/QLocalServer>
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#include <QtNetwork/QLocalSocket>
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#include <QFileInfo>
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#include <QMessageBox>
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#pragma execution_character_set("utf-8")
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SingleApplication::SingleApplication(int &args, char **argv, QString strServerName) :
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QApplication(args, argv),
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instanceRunning(false),
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localServer(NULL),
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mainWindow(NULL)
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{
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/**
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* 一般来说是取引用程序名作为 localServer 的进程服务名
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* 目前程序的进程名是根据文件名来的，但是一旦用于更改了文件名，那么进程名就不准确了，
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* 所以通过文件名来判断是进程服务是不可靠的，应该写死在代码里
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*/
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// serverName = QFileInfo(QCoreApplication::applicationFilePath()).fileName();
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//m_serverName = strServerName;
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m_serverName = applicationName();
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initLocalConnection();
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}
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void SingleApplication::initLocalConnection()
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{
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instanceRunning = false;
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QLocalSocket socket;
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//将套接字连接至进程服务，参数即为进程服务名
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socket.connectToServer(m_serverName);
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//若在500ms内连接至进程服务，说明进程服务已运行
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if (socket.waitForConnected(500)) {
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instanceRunning = true;
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// 其他处理，如：将启动参数发送到进程服务端
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QTextStream stream(&socket);
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QStringList args = QCoreApplication::arguments();
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if (args.count() > 1)
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stream << args.last();
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else
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stream << QString();
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stream.flush();
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socket.waitForBytesWritten();
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return;
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}
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newLocalServer();//连接不上进程服务器，就创建一个
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}
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////////////////////////////////////////////////////////////////////////////////
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// 说明：
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// 创建LocalServer
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////////////////////////////////////////////////////////////////////////////////
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void SingleApplication::newLocalServer()
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{
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localServer = new QLocalServer(this);
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connect(localServer, SIGNAL(newConnection()), this, SLOT(newLocalConnection()));
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if (!localServer->listen(m_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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if (localServer->serverError() == QAbstractSocket::AddressInUseError) {
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QLocalServer::removeServer(m_serverName); //移除进程服务
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localServer->listen(m_serverName); //再次监听
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}
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}
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}
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void SingleApplication::newLocalConnection()
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{
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//监听进程服务，当有数据进来时，可以通过 nextPendingConnection() 获取套接字
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QLocalSocket *socket = localServer->nextPendingConnection();
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if (!socket)
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return;
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socket->waitForReadyRead(1000);
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//其他处理
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QTextStream stream(socket);
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delete socket;
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if (mainWindow != NULL) {
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//当主窗口对象不为空时，说明有可能主窗口被隐藏了，所以需要将其展示在桌面，同时给予用户提示
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mainWindow->raise();
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mainWindow->activateWindow();
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mainWindow->setWindowState((mainWindow->windowState() & ~Qt::WindowMinimized) | Qt::WindowActive);
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mainWindow->show();
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//QMessageBox::warning(NULL, "警告", "程序已经启动！");
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}
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}
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////////////////////////////////////////////////////////////////////////////////
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// 说明：
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// 检查是否已有一个实例在运行, true - 有实例运行， false - 没有实例运行
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////////////////////////////////////////////////////////////////////////////////
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bool SingleApplication::getInstanceRunning() const
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{
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return instanceRunning;
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}
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QMainWindow *SingleApplication::getMainWindow() const
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{
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return mainWindow;
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}
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void SingleApplication::setMainWindow(QMainWindow *value)
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{
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mainWindow = value;
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}
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