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我有一个使用 QUdpSocket 广播心跳消息的应用程序：

mpsckUDP = new QUdpSocket(this);
mpsckUDP->bind(QHostAddress::Broadcast, clsMainWnd::mscuint16Port);
QObject::connect(mpsckUDP, SIGNAL(readyRead()), this, SLOT(onUDPdataRdh()));

mscuint16Port 是：

const quint16 clsMainWnd::mscuint16Port(8081);

发送消息的代码：

const QByteArray carybytData(/*My message*/);
qint64 int64Written(mpsckUDP->writeDatagram(carybytData, QHostAddress::LocalHost, clsMainWnd::mscuint16Port));

int64Written 在每次调用 writeDatagram 后被赋值为 47。在我在同一系统上运行的客户端应用程序中：

mpsckUDP = new QUdpSocket(this);
uint uintPort(8081);
mpsckUDP->bind(QHostAddress::LocalHost, uintPort);
QObject::connect(mpsckUDP, SIGNAL(readyRead()), this, SLOT(onUDPdataRdy()));

插槽：

void clsMainWnd::onUDPdataRdy() {
    QHostAddress objSender;
    QByteArray arybytData;
    quint16 uint16Port;
    arybytData.resize(mpsckUDP->pendingDatagramSize());
    mpsckUDP->readDatagram(arybytData.data(), arybytData.size(), &objSender, &uint16Port);
    ...
}

我在同一系统上的客户端应用程序上启动了两个实例，问题是只有第一个实例正在接收 UDP 广播，另一个没有接收到任何东西......

目的是拥有许多客户端和单个广播应用程序。

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1 回答 1

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主要应用：

mpsckUDP = new QUdpSocket(this);
//Connection only required if you are going to receive data back on UDP
QObject::connect(mpsckUDP, SIGNAL(readyRead()), this, SLOT(onUDPdataRdy()));

广播逻辑：

qint64 int64Written(mpsckUDP->writeDatagram(carybytData, QHostAddress::Broadcast, clsMainWnd::mscuint16Port));

在客户端应用程序中：

mpsckUDP = new QUdpSocket(this);
mpsckUDP->bind(uintPort, QUdpSocket::ShareAddress);
QObject::connect(mpsckUDP, SIGNAL(readyRead()), this, SLOT(onUDPdataRdy()));

现在一切都很好！

于 2022-03-02T15:04:10.543 回答