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"
改动说明:
- 删除了对
setBroadcast()
方法的调用。 - 在
bind()
时,使用了QHostAddress::AnyIPv4
,这更明确地指示它应接受 IPv4 广播。
编译和运行
请再次尝试编译和运行这个更新后的代码。如果还有其他问题,请随时告诉我!
内容由零声教学AI助手提供,问题来源于学员提问