Qt之QUdpSocket定时器网络广播

来源：互联网发布：客户端怎么访问数据库编辑：程序博客网时间：2024/06/05 10:00

UDP(用户数据报协议)是一个轻量级的，不可靠的，面向数据报的，无连接协议。当可靠性不是很重要的时候就可以使用该协议。

程序实现功能：1.设定时间发送信息 2.服务端和客户端在同一个程序 3.可以发送中文 4.Tabwidget组件简单使用

困扰：在linux运行正常，可是在window在就出现一次发三条信息,无解中！

实现效果图：

头文件：

#ifndef UDPBROADCAST_H#define UDPBROADCAST_H#include <QMainWindow>#include <QTimer>#include <QDebug>#include <QUdpSocket>#include <QTextCodec>namespace Ui {    class UdpBroadcast;}class UdpBroadcast : public QMainWindow{    Q_OBJECTpublic:    explicit UdpBroadcast(QWidget *parent = 0);    ~UdpBroadcast();private:    Ui::UdpBroadcast *ui;    QTimer *m_timer;     QUdpSocket *m_Server_udp;     QUdpSocket *m_Client_udp;private slots:    void soltTiming();    void slotBroadcast();    void slotClientConnect();    void slotClientReadMesg();        void slotTabChange(int i);};#endif // UDPBROADCAST_H

实现代码如下：

#include "UdpBroadcast.h"#include "ui_UdpBroadcast.h"UdpBroadcast::UdpBroadcast(QWidget *parent) :        QMainWindow(parent),        ui(new Ui::UdpBroadcast){    ui->setupUi(this);            ui->spinBox_time->setValue(1);        QTextCodec::setCodecForTr(QTextCodec::codecForName("GBK"));    //    QTextCodec::setCodecForLocale(QTextCodec::codecForName("utf-8"));    //    QTextCodec::setCodecForCStrings(QTextCodec::codecForName("GBK"));        this->connect(ui->pushButton_BroadCast,SIGNAL(clicked()),this,SLOT(slotBroadcast()));    this->connect(ui->pushButton_connt,SIGNAL(clicked()),this,SLOT(slotClientConnect()));    this->connect(ui->tabWidget,SIGNAL(currentChanged(int)),this,SLOT(slotTabChange(int)));}UdpBroadcast::~UdpBroadcast(){    delete ui;}void UdpBroadcast::slotTabChange(int i){    if(i==0)    {        this->setWindowTitle(tr("服务端"));    }    else if(i==1)    {        this->setWindowTitle(tr("客户端"));    }}void UdpBroadcast::slotBroadcast(){         m_Server_udp = new QUdpSocket(this);        m_timer = new QTimer(this);        this->connect(m_timer,SIGNAL(timeout()),this,SLOT(soltTiming()));        m_timer->start(ui->spinBox_time->text().toInt()*1000);      //定时器}void UdpBroadcast::soltTiming(){    QString qStrMesg = ui->lineEdit_Mesg->text();    qDebug()<<endl;    qDebug()<<qStrMesg;    if(qStrMesg == "")    {        return;    }        int length;    //发送    if((length = m_Server_udp->writeDatagram(qStrMesg.toUtf8(),qStrMesg.toUtf8().length(),QHostAddress::Broadcast,55555)))    {        return;    }}void UdpBroadcast::slotClientConnect(){    ui->textEdit_Mesg->clear();        m_Client_udp = new QUdpSocket(this);        m_Client_udp->bind(55555);              this->connect(m_Client_udp,SIGNAL(readyRead()),this,SLOT(slotClientReadMesg()));    }void UdpBroadcast::slotClientReadMesg(){        while(m_Client_udp->hasPendingDatagrams())  //是否有数据报过来    {        QByteArray qdata;        qdata.resize(m_Client_udp->pendingDatagramSize());      //数据报大小        m_Client_udp->readDatagram(qdata.data(),qdata.size());      //读取        QString ss;        ss = QString::fromUtf8(qdata);      //中文        ui->textEdit_Mesg->append(ss);    }    }