QT网络编程UDP下C/S架构广播通信(实例讲解)
投稿:jingxian
下面小编就为大家带来一篇QT网络编程UDP下C/S架构广播通信(实例讲解)。小编觉得挺不错的,现在就分享给大家,也给大家做个参考。一起跟随小编过来看看吧
QT有封装好的UDP协议的类,QUdpSocket,里面有我们想要的函数接口。感兴趣的话,可以看看。
先搞服务端吧,写一个子类,继承QDialog类,起名为UdpServer类。头文件要引用我们上边说的QUdpSocket这个类,还有我们想要的布局的类。
#ifndef UDPSERVER_H #define UDPSERVER_H #include <QDialog> #include <QLabel> #include <QLineEdit> #include <QPushButton> #include <QVBoxLayout> #include <QtNetwork/QUdpSocket> #include <QtNetwork/QHostAddress> #include <QTimer> class UdpServer : public QDialog { Q_OBJECT public: UdpServer(QWidget *parent = 0,Qt::WindowFlags f= 0); ~UdpServer(); private: QLabel * TimerLabel; QLineEdit * TextLineEdit; QPushButton* StartBtn; QVBoxLayout * mainLayout; public slots: void StartBtnClicked(); void timeout(); private: int port; bool isStarted; QUdpSocket * udpSocket; QTimer *timer; }; #endif // UDPSERVER_H
在.cpp文件里,我们先是把界面显示出来,然后用udp的writedategram把想要传的写进去。
#include "udpserver.h" UdpServer::UdpServer(QWidget *parent,Qt::WindowFlags f) : QDialog(parent,f) { setWindowTitle(tr("UDP SERVER")); TimerLabel = new QLabel(tr("show time:"),this); TextLineEdit = new QLineEdit(this); StartBtn = new QPushButton(tr("start"),this); mainLayout = new QVBoxLayout(this); mainLayout-> addWidget(TimerLabel); mainLayout-> addWidget(TextLineEdit); mainLayout-> addWidget(StartBtn); connect(StartBtn,SIGNAL(clicked()),this,SLOT(StartBtnClicked())); port = 5555; isStarted = false; udpSocket = new QUdpSocket(this); timer = new QTimer(this); connect(timer,SIGNAL(timeout()),this,SLOT(timeout())); } UdpServer::~UdpServer() { } void UdpServer::StartBtnClicked() { if(!isStarted) { StartBtn->setText(tr("STOP")); timer->start(1000); isStarted = true; } else { StartBtn->setText(tr("BEGIN")); isStarted = false; timer->stop(); } } void UdpServer::timeout() { QString msg = TextLineEdit->text(); int length=0; if(msg=="") { return; } if((length=udpSocket->writeDatagram(msg.toLatin1(),msg.length(),QHostAddress::Broadcast,port))!=msg.length()) { qDebug() << msg.toLatin1(); return; } }
我这里用qDebug把要传的东西打印出来,进行测试,看看是否传过去了。
客户端:
#ifndef UDPCLIENT_H #define UDPCLIENT_H #include <QDialog> #include <QVBoxLayout> #include <QTextEdit> #include <QPushButton> #include <QtNetwork/QUdpSocket> class UdpClient : public QDialog { Q_OBJECT public: UdpClient(QWidget *parent = 0); ~UdpClient(); private: QTextEdit* ReceiceTextEdit; QPushButton* CloseBtn; QVBoxLayout* mainLayout; public slots: void CloseBtnClicked(); void dataReceived(); private: int port; QUdpSocket* udpSocket; }; #endif // UDPCLIENT_H
客户端很简单,怎么实现布局,我就不多说了,主要是dataReceive函数。
#include "udpclient.h" #include <QMessageBox> #include <QHostAddress> UdpClient::UdpClient(QWidget *parent) :QDialog(parent) { setWindowTitle("UDP CLIENT"); ReceiceTextEdit = new QTextEdit(this); CloseBtn = new QPushButton(tr("Close"),this); mainLayout = new QVBoxLayout(this); mainLayout->addWidget(ReceiceTextEdit); mainLayout->addWidget(CloseBtn); connect(CloseBtn,SIGNAL(clicked()),this,SLOT(CloseBtnClicked())); port =5555; udpSocket = new QUdpSocket(this); bool result = udpSocket->bind(port); if(!result) { QMessageBox::information(this,tr("ERROR"),tr("connect error")); return; } connect(udpSocket,SIGNAL(readyRead()),this,SLOT(dataReceived())); } UdpClient:: ~UdpClient() { } void UdpClient::CloseBtnClicked() { close(); } void UdpClient::dataReceived() { while(udpSocket->hasPendingDatagrams()) { QByteArray datagram; datagram.resize(udpSocket->pendingDatagramSize()); udpSocket->readDatagram(datagram.data(),datagram.size()); QString msg=datagram.data(); ReceiceTextEdit->insertPlainText(msg); } }
最后显示一下界面,服务端发送hello。
客户端收到的:
不停的在打印hello。直到点击关闭,或者服务端停止。
以上这篇QT网络编程UDP下C/S架构广播通信(实例讲解)就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持脚本之家。