无线电 iq 数据通过 udp 传输，qt 实现，接收端收到数据后存入文件中，请举例

在Qt中，使用UDP（User Datagram Protocol）协议处理无线电IQ（In-phase and Quadrature）数据并将其存储到文件中，首先你需要设置一个UDP socket监听器来接收数据，然后解析接收到的数据并将它们写入文件。以下是一个简单的示例代码：

#include <QObject>
#include <QThread>
#include <QUdpSocket>
#include <QDataStream>
#include <QFile>
#include <QDir>

class UDPReceiver : public QObject
{
    Q_OBJECT

public slots:
    void startReceiving();
    void stopReceiving();

private:
    QUdpSocket *udpSocket;
    QDir dir;
    QFile file;

signals:
    void dataReceived(const QByteArray &data);

private:
    void receiveLoop();
};

void UDPReceiver::startReceiving()
{
    if (!udpSocket->isValid()) {
        qDebug() << "Starting UDP receiver";
        udpSocket = new QUdpSocket(this);
        connect(udpSocket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(handleError()));
        connect(udpSocket, SIGNAL(readyRead()), this, SLOT(receiveData()));
        if (!udpSocket->bind("0.0.0.0", 5000)) { // Listen on any available port
            qCritical() << "Failed to bind UDP socket";
            return;
        }
        thread = new QThread(this);
        moveToThread(thread);
        thread->start();
    }
}

void UDPReceiver::stopReceiving()
{
    if (thread && thread->isRunning()) {
        disconnect(udpSocket, NULL, this, NULL);
        emit dataReceived(nullptr); // Signal to stop receiving in the thread
        thread->quit();
        thread->wait(); // Wait for the thread to finish
        delete thread;
        thread = nullptr;
        delete udpSocket;
    }
}

void UDPReceiver::receiveData()
{
    QByteArray buffer;
    while (udpSocket->hasPendingDatagrams()) {
        buffer += udpSocket->readDatagram(1024);
        emit dataReceived(buffer); // Emit signal with received data
    }
}

void UDPReceiver::handleError()
{
    qWarning() << "UDP error: " << static_cast<QAbstractSocket::SocketError>(udpSocket->error());
}

// In your main application or a separate class where you use UDPReceiver
int main(int argc, char *argv[])
{
    QApplication app(argc, argv);

    UDPReceiver receiver;
    receiver.startReceiving();

    // ... Your main loop here ...

    receiver.stopReceiving(); // Stop receiving when needed
    return app.exec();
}

在这个例子中，`UDPReceiver`类负责创建一个UDP套接字，开始监听，并在接收到数据时触发信号。当停止接收时，你可以关闭套接字，并在主线程中调用`receiver.stopReceiving()`。

每次有新的数据到达，`dataReceived`信号会被发射，你可以在这里处理数据，例如：

// 在主窗口或者其他接收者类里
connect(receiver, &UDPReceiver::dataReceived, this, [receiver](const QByteArray &data) {
    if (data.isEmpty()) {
        receiver.stopReceiving(); // If there's no more data, stop receiving
        return;
    }

    // Parse IQ data
    QDataStream stream(data);
    // ... Process IQ data here ...
    // Save to a file, assuming 'iqFile' is already open in write mode
    qint64 bytesWritten = stream.writeTo(iqFile);
    if (bytesWritten != data.size()) {
        qCritical() << "Failed to write IQ data to file";
    }
});

这个例子展示了基本的接收、解析和保存过程，实际应用中可能还需要根据具体的数据格式来解析IQ数据。同时，为了更好地处理网络错误和异常情况，你可能需要添加更多的错误检查和恢复机制。