E:\7_qt_dir\Broadcast\main.cpp:15: error: 'class QUdpSocket' has no member named 'setBroadcast' udpSocket->setBroadcast(true); // 璁剧疆涓哄箍鎾ā寮 ^~~~~~~~~~~~-QT开发中文网

QUdpSocket 实际上并没有 setBroadcast 方法，广播功能是通过创建套接字时的默认行为来实现的。您可以直接绑定到广播地址，或在发送数据报时使用特定选项。

下面是修正后的代码，不再调用不存在的 setBroadcast 方法：

#include <QCoreApplication>
#include <QUdpSocket>
#include <QHostAddress>
#include <QString>
#include <QObject>
#include <QDebug>
#include <QTimer>

class UdpBroadcaster : public QObject {
    Q_OBJECT

public:
    UdpBroadcaster(QObject *parent = nullptr) : QObject(parent) {
        // 创建 UDP 套接字
        udpSocket = new QUdpSocket(this);
        
        // 每隔一段时间发送一次广播消息
        timer = new QTimer(this);
        connect(timer, &QTimer::timeout, this, &UdpBroadcaster::sendBroadcast);
        timer->start(1000); // 每秒发送一次
    }

private slots:
    void sendBroadcast() {
        QByteArray datagram = "Hello from broadcaster!";
        
        // 发送广播到指定端口（例如12345）
        udpSocket->writeDatagram(datagram, QHostAddress::Broadcast, 12345);
        qDebug() << "Sent broadcast:" << datagram;
    }

private:
    QUdpSocket *udpSocket;
    QTimer *timer;
};

class UdpReceiver : public QObject {
    Q_OBJECT

public:
    UdpReceiver(QObject *parent = nullptr) : QObject(parent) {
        udpSocket = new QUdpSocket(this);

        // 在任何地址上绑定指定端口（12345）
        if (udpSocket->bind(QHostAddress::AnyIPv4, 12345)) {  // 使用 AnyIPv4 而不是 Any
            qDebug() << "Listening for broadcasts on port 12345...";
            connect(udpSocket, &QUdpSocket::readyRead, this, &UdpReceiver::processPendingDatagrams);
        } else {
            qWarning() << "Failed to bind socket!";
        }
    }

private slots:
    void processPendingDatagrams() {
        while (udpSocket->hasPendingDatagrams()) {
            QByteArray buffer;
            buffer.resize(udpSocket->pendingDatagramSize());

            QHostAddress sender;
            quint16 senderPort;

            udpSocket->readDatagram(buffer.data(), buffer.size(), &sender, &senderPort);
            QString message = QString::fromUtf8(buffer);

            qDebug() << "Received broadcast from" << sender.toString() << ":" << senderPort << "-" << message;
        }
    }

private:
    QUdpSocket *udpSocket;
};

int main(int argc, char *argv[]) {
    QCoreApplication a(argc, argv);

    UdpBroadcaster broadcaster; // 创建广播器
    UdpReceiver receiver;       // 创建接收器

    return a.exec();
}

#include "main.moc"