QThread监听UDP报文实践

参考

线程参考 blog.csdn.net/jinhucheng/… udp参考 blog.csdn.net/weixin_4221…

思路

proc.moveToThread(&thread);//proc中所有的槽都会在另一个线程（thread）中执行

UdpReceiver

槽receive 监听udp报文，把监听到的报文放入一个线程安全的容器C，抛出 readyProcess信号

Processor

readyProcess 触发processUdp槽，从容器C拿出数据进行处理

代码

#ifndef UDPRECEIVER_H
#define UDPRECEIVER_H

#include <QObject>
#include <QUdpSocket>

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

signals:
    /**
     * @brief 在receive槽中抛出它，表明可以进行下一步的费时处理
     */
    void readyProcess();
public slots:
    /**
     * @brief 将readyRead信号与它连接
     */
    void receive();
private:
    QUdpSocket *udpSocket;
};

#endif // UDPRECEIVER_H

#include "udpreceiver.h"
#include <QByteArray>
#include <QThread>
UdpReceiver::UdpReceiver(QObject *parent) : QObject(parent)
{
    udpSocket = new QUdpSocket;
    udpSocket->bind(QHostAddress("127.0.0.1"), 4567);
    connect(udpSocket, SIGNAL(readyRead()), this, SLOT(receive()));
}
UdpReceiver::~UdpReceiver()
{
    delete udpSocket;
}
void UdpReceiver::receive()
{
    qDebug()<<"thread "<<QThread::currentThreadId()<<"receive";
    QByteArray ba;
    while(udpSocket->hasPendingDatagrams())
    {
        ba.resize(udpSocket->pendingDatagramSize());
        udpSocket->readDatagram(ba.data(), ba.size());
        qDebug()<< ba.data();
        
    }
    //将数据放进一个共享的互斥容器C
    emit readyProcess();
}

#ifndef PROCESSOR_H
#define PROCESSOR_H

#include <QObject>
/**
 * @brief 处理UDP监听到的数据
 */
class Processor : public QObject
{
    Q_OBJECT
public:
    explicit Processor(QObject *parent = nullptr);

signals:

public slots:
    /**
     * @brief 复杂的处理报文操作
     */
    void processUdp();
};

#endif // PROCESSOR_H

#include "processor.h"
#include <QThread>
#include <QDebug
Processor::Processor(QObject *parent) : QObject(parent)
{
}
void Processor::processUdp(){
     qDebug()<<"thread "<<QThread::currentThreadId()<<"start process ";
    //从共享的容器C中取数据 
     //代表复杂的操作
     int i=1000000000;
     while(i-->0){}
     qDebug()<<"process done";
}

#include <QCoreApplication>
#include "udpreceiver.h"
#include "processor.h"
#include <QThread>
int main(int argc, char *argv[])
{
    qDebug()<<"main thread "<<QThread::currentThreadId();
    QCoreApplication a(argc, argv);
    QThread thread;
    UdpReceiver rec;
    Processor proc;
    proc.moveToThread(&thread);//proc中所有的槽都会在另一个线程中执行
    QObject::connect(&rec, SIGNAL(readyProcess()), &proc, SLOT(processUdp()));
    thread.start();

    return a.exec();
}

上述代在主线程中接收数据，在线程中处理数据