应用软件，只允许运行一次

[YiQin]

如题，如何使已经运行的应用软件，不允许再双击再次运行。在网上查了有qtsingleappliction这个方法，但是我不知道为什么没办法找到这个库。请问这是问什么？

[ericyanhj]

m_bFirst = true;
QString serverName = QCoreApplication::applicationName();
QLocalSocket socket;
socket.connectToServer(serverName);
if (socket.waitForConnected(500)) {
    m_bFirst = false;
}else{
    m_localServer = new QLocalServer(this);
    if (!m_localServer->listen(serverName)) {
        if (m_localServer->serverError() == QAbstractSocket::AddressInUseError
                && QFile::exists(m_localServer->serverName())) {
            QFile::remove(m_localServer->serverName());
            m_localServer->listen(serverName);
        }
    }
}

m_bFirst为false，表示已经存在。 你可以试试先

[motherfucker_li]

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