qt udp多线程接收图片

以下是一个简单的示例代码，演示如何在Qt中使用多线程接收UDP数据包，并将接收到的数据包中的图像显示出来：

// receiver.h
#ifndef RECEIVER_H
#define RECEIVER_H

#include <QObject>
#include <QUdpSocket>

class Receiver : public QObject
{
    Q_OBJECT
public:
    explicit Receiver(QObject *parent = nullptr);

signals:
    void imageReceived(QImage image);

public slots:
    void start();

private:
    QUdpSocket *m_udpSocket;
};

#endif // RECEIVER_H

// receiver.cpp
#include "receiver.h"

Receiver::Receiver(QObject *parent) : QObject(parent)
{
    m_udpSocket = new QUdpSocket(this);
}

void Receiver::start()
{
    m_udpSocket->bind(QHostAddress::LocalHost, 1234);

    while (true) {
        QByteArray datagram;
        datagram.resize(m_udpSocket->pendingDatagramSize());

        QHostAddress sender;
        quint16 senderPort;
        m_udpSocket->readDatagram(datagram.data(), datagram.size(), &sender, &senderPort);

        QImage image;
        image.loadFromData(datagram);
        emit imageReceived(image);
    }
}

// mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QLabel>
#include "receiver.h"

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    MainWindow(QWidget *parent = nullptr);
    ~MainWindow();

private slots:
    void onImageReceived(QImage image);

private:
    QLabel *m_imageLabel;
    Receiver *m_receiver;
};

#endif // MAINWINDOW_H

// mainwindow.cpp
#include "mainwindow.h"

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    m_imageLabel = new QLabel(this);
    setCentralWidget(m_imageLabel);

    m_receiver = new Receiver(this);
    connect(m_receiver, &Receiver::imageReceived, this, &MainWindow::onImageReceived);

    QThread *thread = new QThread(this);
    m_receiver->moveToThread(thread);
    connect(thread, &QThread::started, m_receiver, &Receiver::start);
    thread->start();
}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::onImageReceived(QImage image)
{
    m_imageLabel->setPixmap(QPixmap::fromImage(image));
}

在这个示例中，我们创建了一个名为`Receiver`的类，它继承自`QObject`，并使用`QUdpSocket`类接收UDP数据包。`Receiver`类还定义了一个信号`imageReceived`，该信号将在接收到图像数据时发出，并将其发送到`MainWindow`中的`QLabel`中进行显示。

在`MainWindow`类中，我们创建了一个`Receiver`对象，并将其移动到一个新的线程中运行。我们还定义了一个`onImageReceived`槽，该槽将在接收到图像数据时被调用，并将图像显示在`QLabel`中。

使用多线程接收UDP数据包时，请注意确保您的代码是线程安全的，并避免在不同线程之间共享数据。