qt实现tcpserver

Qt是一个跨平台的C++开发框架，可以实现各种各样的应用程序开发。在Qt中实现TCP服务器可以使用QTcpServer类。

下面是简单的步骤：

1. 创建QTcpServer对象

QTcpServer *server = new QTcpServer(this);

2. 绑定端口并监听

if (!server->listen(QHostAddress::Any, 8888)) {
    qDebug() << "Server could not start!";
}
else {
    qDebug() << "Server started!";
}

3. 处理连接请求

connect(server, SIGNAL(newConnection()), this, SLOT(newConnection()));

void MyClass::newConnection()
{
    QTcpSocket *socket = server->nextPendingConnection();
    connect(socket, SIGNAL(readyRead()), this, SLOT(readyRead()));
    connect(socket, SIGNAL(disconnected()), this, SLOT(disconnected()));
    sockets.append(socket);
}

void MyClass::readyRead()
{
    QTcpSocket *socket = qobject_cast<QTcpSocket*>(sender());
    if (socket) {
        QByteArray data = socket->readAll();
        // 处理接收到的数据
    }
}

void MyClass::disconnected()
{
    QTcpSocket *socket = qobject_cast<QTcpSocket*>(sender());
    if (socket) {
        sockets.removeOne(socket);
        socket->deleteLater();
    }
}

4. 发送数据

QTcpSocket *socket = sockets.at(0);
socket->write("Hello World!");

上面是一个简单的例子，当有客户端连接时，服务器会为客户端创建一个QTcpSocket对象，并将其与readyRead()和disconnected()槽函数连接起来。当客户端发送数据时，服务器会从QTcpSocket对象中读取数据并进行处理。