Reply to 应用软件，只允许运行一次 on Mon, 05 Mar 2018 08:16:30 GMT

ericyanhj — Mon, 05 Mar 2018 08:16:30 GMT

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