使用C++写一个QT5.15.2版本编译正常的ssdp协议发送搜索消息并打印接受到的设备返回信息

以下是一个基于QT5.15.2版本的ssdp搜索代码示例，它可以发送搜索消息并打印接收到的设备返回信息。需要注意的是，此代码可能需要根据实际情况进行适当修改，以确保其能够正确运行。

#include <QUdpSocket>
#include <QNetworkInterface>
#include <QHostAddress>
#include <QDebug>

#define SSDP_MULTICAST_ADDRESS "239.255.255.250"
#define SSDP_PORT 1900
#define SSDP_MX 3

class SsdpSearcher : public QObject
{
    Q_OBJECT

public:
    SsdpSearcher(QObject *parent = nullptr) : QObject(parent)
    {
        udpSocket = new QUdpSocket(this);
        udpSocket->bind(QHostAddress::AnyIPv4, SSDP_PORT, QUdpSocket::ShareAddress);
        udpSocket->joinMulticastGroup(QHostAddress(SSDP_MULTICAST_ADDRESS));

        connect(udpSocket, SIGNAL(readyRead()), this, SLOT(processPendingDatagrams()));
    }

    ~SsdpSearcher()
    {
        udpSocket->leaveMulticastGroup(QHostAddress(SSDP_MULTICAST_ADDRESS));
        udpSocket->close();
    }

    void search()
    {
        QByteArray datagram = "M-SEARCH * HTTP/1.1\r\n"
                              "HOST: " SSDP_MULTICAST_ADDRESS ":" + QByteArray::number(SSDP_PORT) + "\r\n"
                              "MAN: \"ssdp:discover\"\r\n"
                              "ST: ssdp:all\r\n"
                              "MX: " + QByteArray::number(SSDP_MX) + "\r\n"
                              "\r\n";

        udpSocket->writeDatagram(datagram, QHostAddress(SSDP_MULTICAST_ADDRESS), SSDP_PORT);
    }

private slots:
    void processPendingDatagrams()
    {
        while (udpSocket->hasPendingDatagrams()) {
            QByteArray datagram;
            datagram.resize(udpSocket->pendingDatagramSize());
            udpSocket->readDatagram(datagram.data(), datagram.size());

            qDebug() << datagram.constData();
        }
    }

private:
    QUdpSocket *udpSocket;
};

在主函数中，可以使用以下代码来创建SsdpSearcher实例并执行搜索：

#include <QCoreApplication>

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

    SsdpSearcher searcher;
    searcher.search();

    return a.exec();
}