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_OBJECT public: Sender(QObject *parent=0); void start(); private slots: void broadgram(); private: QUdpSocket *udpSocket; QTimer *<a class="tags" href="/tags/TIMER.html" title=timer>timer</a>; int messageNo; }; #endif // H_H

 

main.cpp

 

#include <QtCore> #include <QObject> #include "header.h" #include <QtNetwork> Sender ::Sender(QObject *parent):QObject(parent){ <a class="tags" href="/tags/TIMER.html" title=timer>timer</a>=new QTimer(this); udpSocket=new QUdpSocket(this); connect(<a class="tags" href="/tags/TIMER.html" title=timer>timer</a>,SIGNAL(timeout()),this,SLOT(broadgram())); messageNo=1; } void Sender::start(){ <a class="tags" href="/tags/TIMER.html" title=timer>timer</a>->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_OBJECT public: 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:'