QUdpSocket readyRead()没有发送？

Question

我对Qt和调试一个使用QtUdpSocket接收一些数据的应用程序都很陌生。似乎从未发出readyRead()信号：

#include <QUdpSocket>
#include<qdatastream.h>
#include "Globals.h"

typedef struct _udp_data_frame
{
    quint8 signal;
    quint8 rampNumber;
    QByteArray recvBuffer;
    quint32 payloadPacketSize;
}UDPDataFrame_t;

class MyUDP : public QUdpSocket
{
    Q_OBJECT

public:
    explicit MyUDP(QObject *parent = nullptr);
    bool bindPorts(QHostAddress addr, qint16 port);
    void unbindPorts(void);
    void stopStreaming(void);

signals:
    void newMessage(const QString &from, const QString &message);
    void newData(const QString &from, UDPDataFrame_t data);

public slots:
    void readyRead(void);
    void messageReady(void);
    void sendMessage(QHostAddress hostAddress, quint16 hostPort, QString string);

private:
    QUdpSocket *socket_infoserver;
    QUdpSocket *socket_streamingclient;

    UDPDataFrame_t data;
    QByteArray buffer;
    QHostAddress clientAddr;
    quint16 clientPort;
    quint32 payloadPacketSize;
    quint8 header;
};

和

#include "myudp.h"
#include <iostream>

static inline quint32 ArrayToUInt(QByteArray source, QDataStream::ByteOrder byteOrder);
static inline quint8 ArrayToByte(QByteArray source);

static bool bStreamingStarted;

MyUDP::MyUDP(QObject *parent) : QUdpSocket(parent)
{
    socket_infoserver = new QUdpSocket();
    socket_streamingclient = new QUdpSocket();
}

bool MyUDP::bindPorts(QHostAddress addr, qint16 port)
{
    socket_infoserver->abort();
    socket_streamingclient->abort();

    QHostAddress remote_host;
    remote_host.setAddress("192.168.168.130");

    if (socket_streamingclient->bind(addr, ROPA_STREAMPORT))
    {
        socket_streamingclient->connectToHost(remote_host, ROPA_STREAMPORT);
        socket_streamingclient->waitForConnected(1000);
        connect(socket_streamingclient, SIGNAL(readyRead()), this, SLOT(messageReady()));
    }

    return true;
}

void MyUDP::readyRead()
{
    QByteArray temp_buffer;
    temp_buffer.resize(socket_infoserver->pendingDatagramSize());

    QHostAddress sender;
    quint16 senderPort;

    socket_infoserver->readDatagram(temp_buffer.data(), temp_buffer.size(),
                         &sender, &senderPort);

    emit newMessage(sender.toString(), temp_buffer);
}

void MyUDP::messageReady()
{
    ...
}

到目前为止，我已经确认有使用Wireshark的传入数据包。目标IP和端口是正确的。此外，我可以使用nc -l -u -p <PORT>在命令行中看到传入的数据。此外，我还尝试在绑定之后添加一个socket_streamingclient->hasPendingDatagrams()，但是没有任何数据报。

我遗漏的代码中有错误吗？或者，您可以提示如何调试此问题吗？

如果有必要，我很乐意提供更多的信息或代码。

Answer 1

我单独测试了所有建议的更改，它们似乎都是必要的。MyUDP::bindPorts()的工作版本现在看起来如下：

bool MyUDP::bindPorts(QHostAddress addr, qint16 port)
{
    socket_streamingclient->abort();

    if(socket_streamingclient->bind( QHostAddress::Any, ROPA_STREAMPORT, 
                                     QUdpSocket::ShareAddress | QUdpSocket::ReuseAddressHint) )
    {
        connect(socket_streamingclient, &QUdpSocket::readyRead, this, &MyUDP::messageReady);
    }

    return true;
}