[QT] UDP协议演示实例

UDP应用.实例...

建立项目

然后在 pro文件加入

QT += network 代码

否则会提示你找不到 QtNetwork类..

 

先看 发送数据的代码

header.h

#ifndef H_H#define H_H#include <QObject>class QTimer;class QUdpSocket;class Sender:public QObject{ Q_OBJECTpublic: Sender(QObject *parent=0); void start();private slots: void broadgram();private: QUdpSocket *udpSocket; QTimer *timer; int messageNo;};#endif // H_H

 

main.cpp

 

#include <QtCore>#include <QObject>#include "header.h"#include <QtNetwork>Sender ::Sender(QObject *parent):QObject(parent){ timer=new QTimer(this); udpSocket=new QUdpSocket(this); connect(timer,SIGNAL(timeout()),this,SLOT(broadgram())); messageNo=1;}void Sender::start(){ timer->start(1000);}void Sender::broadgram(){ qDebug()<<(tr("开始广播：%1").arg(messageNo)); QByteArray datagram = "send message:"+ QByteArray::number(messageNo); udpSocket->writeDatagram(datagram.data(), datagram.size(), QHostAddress::LocalHost, 44444); ++messageNo;}int main(int argc, char *argv[]){ QCoreApplication a(argc, argv); QTextCodec::setCodecForTr(QTextCodec::codecForName("gb18030")); Sender sender; sender.start(); return a.exec();} 

 

 

再看 接受数据的代码

receiver.h

 

#ifndef RECEIVER_H#define RECEIVER_H#include <QObject>class QUdpSocket;class Receiver : public QObject{ Q_OBJECTpublic: Receiver(QObject *parent =0 ); //~Receiver();private slots: void processPendingDatagrams();private: QUdpSocket *udpSocket;};#endif // RECEIVER_H 

 

receiver.cpp

#include "receiver.h"#include <QtNetwork>Receiver::Receiver(QObject *parent): QObject(parent){udpSocket = new QUdpSocket(this);udpSocket->bind(44444);connect(udpSocket, SIGNAL(readyRead()),this, SLOT(processPendingDatagrams()));}void Receiver::processPendingDatagrams(){while (udpSocket->hasPendingDatagrams()) {QByteArray datagram;datagram.resize(udpSocket->pendingDatagramSize());udpSocket->readDatagram(datagram.data(), datagram.size());qDebug()<<(tr("接收数据: /"%1/"").arg(datagram.data()));} 

 

 

main.cpp

 

#include <QtCore>#include <QObject>#include "receiver.h"int main(int argc, char *argv[]){ QCoreApplication app(argc, argv); QTextCodec::setCodecForTr( QTextCodec::codecForName("gb2312")); Receiver receiver; return app.exec();} 

 

 

效果:'