qt下udp组播代码
时间: 2024-01-27 19:04:08 浏览: 19
在Qt下实现UDP组播的代码如下:
```cpp
#include <QUdpSocket>
#include <QNetworkInterface>
void sendMulticastMessage()
{
QUdpSocket socket;
QByteArray datagram = "Hello, multicast!";
QHostAddress groupAddress("239.255.0.1");
quint16 groupPort = 1234;
// 设置套接字为组播模式
if (!socket.bind(QHostAddress::AnyIPv4, groupPort, QUdpSocket::ShareAddress))
{
qDebug() << "Failed to bind socket:" << socket.errorString();
return;
}
// 加入组播组
if (!socket.joinMulticastGroup(groupAddress))
{
qDebug() << "Failed to join multicast group:" << socket.errorString();
return;
}
// 发送组播消息
qint64 bytesSent = socket.writeDatagram(datagram.data(), datagram.size(), groupAddress, groupPort);
if (bytesSent == -1)
{
qDebug() << "Failed to send multicast message:" << socket.errorString();
return;
}
else
{
qDebug() << "Multicast message sent!";
}
}
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
sendMulticastMessage();
return a.exec();
}
```
注意,这个例子中使用的组播地址为239.255.0.1,端口为1234。你可以根据需要修改这些值。