Windows 11 Named Pipe QLocalServer

[king558]

First of all the server code

server.cpp

#include "server.h"

#include <QtWidgets>
#include <QtNetwork>

Server::Server(QWidget *parent)
    : QDialog(parent)
{
    setWindowFlags(windowFlags() & ~Qt::WindowContextHelpButtonHint);

    server = new QLocalServer(this);
    if (!server->listen("fortune")) {
        QMessageBox::critical(this, tr("Local Fortune Server"),
                              tr("Unable to start the server: %1.")
                              .arg(server->errorString()));
        close();
        return;
    }

    QLabel *statusLabel = new QLabel;
    statusLabel->setWordWrap(true);
    statusLabel->setText(tr("The server is running.\n"
                            "Run the Local Fortune Client example now."));

    fortunes << tr("You've been leading a dog's life. Stay off the furniture.")
             << tr("You've got to think about tomorrow.")
             << tr("You will be surprised by a loud noise.")
             << tr("You will feel hungry again in another hour.")
             << tr("You might have mail.")
             << tr("You cannot kill time without injuring eternity.")
             << tr("Computers are not intelligent. They only think they are.");

    QPushButton *quitButton = new QPushButton(tr("Quit"));
    quitButton->setAutoDefault(false);
    connect(quitButton, &QPushButton::clicked, this, &Server::close);
    connect(server, &QLocalServer::newConnection, this, &Server::connected);

    QHBoxLayout *buttonLayout = new QHBoxLayout;
    buttonLayout->addStretch(1);
    buttonLayout->addWidget(quitButton);
    buttonLayout->addStretch(1);

    QVBoxLayout *mainLayout = new QVBoxLayout(this);
    mainLayout->addWidget(statusLabel);
    mainLayout->addLayout(buttonLayout);

    setWindowTitle(QGuiApplication::applicationDisplayName());
}

void Server::connected() {
    auto clientConnection = server->nextPendingConnection();
    QObject::connect( clientConnection, &QLocalSocket::readyRead, this, &Server::dataReady );
    QObject::connect( clientConnection, &QLocalSocket::disconnected, clientConnection, &QLocalSocket::deleteLater );
    vclient.push_back( clientConnection );
}

void Server::dataReady() {
    QByteArray block;
    QDataStream out(&block, QIODevice::WriteOnly);
    out.setVersion(QDataStream::Qt_5_10);
    const int fortuneIndex = QRandomGenerator::global()->bounded(0, fortunes.size());
    const QString &message = fortunes.at(fortuneIndex);
    out << quint32(message.size());
    out << message;

    int index = 0;
    for ( auto &client : vclient ) {
        QString outBuffer = QString::number( index++ ) + " : " + block;
        client->write(outBuffer.toLatin1());
        client->flush();
        client->disconnectFromServer();
    }
}

client use Winapi,

ConnectNamedPipe - connect to Pipe server
PeekNamedPipe - check if data is available
ReadFile - Read the data

Currently I get the Problem, that sometimes all clients got the same message with same index ID, it was intended that every client received data with different index indicated by index number.

I also recherche that there are option for Single and Multiple Instance. It seems that currently QLocalServer handles it like Option 1 How to setup QLocalServer with Multiple Instance like Option 2?