testUdp

于 2021-04-14 00:16:11 发布
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版权声明：本文为博主原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接和本声明。
本文链接：https://blog.youkuaiyun.com/qq_35523575/article/details/115683080
版权

文章目录

testUdp

单播

回环单播

发送端

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    m_send = new QUdpSocket(this);
    bool result = m_send->bind(9527,QUdpSocket::ShareAddress|QUdpSocket::ReuseAddressHint);
    if(result)
    {


    QTimer *timer = new QTimer(this);
    connect(timer,&QTimer::timeout,this,[=](){
        QString str=QDateTime::currentDateTime().toString("yyyy/MM/dd/hh/mm/ss/zzzddd");
        ui->label->setText(str);
        QByteArray line;
        line = str.toUtf8();
        m_send->writeDatagram(line.data(),QHostAddress("127.0.0.1"),5555);
    });
    timer->start(1000);
        }
}

Widget::~Widget()
{
    delete ui;
}

接收端

#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    ui->textEdit->resize(300,400);
    m_sock = new QUdpSocket(this);
    bool result = m_sock->bind(5555,QUdpSocket::ShareAddress|QUdpSocket::ReuseAddressHint);
    //
    //bool result = m_sock->bind(QHostAddress::AnyIPv4,5555,QUdpSocket::ShareAddress);
    //加入组播
//    result=m_sock->joinMulticastGroup(QHostAddress("224.0.0.100"));
    if(result)
    {
        //设置缓冲区
        m_sock->setSocketOption(QAbstractSocket::ReceiveBufferSizeSocketOption,1024*1024*8);
        //链接接收信号槽
        connect(m_sock,SIGNAL(readyRead()),this,SLOT(dataReceived()));
    }
}

Widget::~Widget()
{
    delete ui;
    //断开
    m_sock->disconnect();
    delete m_sock;
}

void Widget::dataReceived()
{
    while (m_sock->hasPendingDatagrams()) {
        QByteArray datagram;
        datagram.resize(m_sock->pendingDatagramSize());
        m_sock->readDatagram(datagram.data(),datagram.size());
        ui->textEdit->append(datagram);
    }
}

获取本机网络信息

void Widget::getHostInformation()
{
    QString localHostName = QHostInfo::localHostName();
    lineEditLocalHostName->setText(localHostName);
    QHostInfo hostInfo = QHostInfo::fromName(localHostName);
    QList<QHostAddress> listAddress=hostInfo.addresses();
    if(!listAddress.isEmpty())
    {
        LineEditAddress->setText(QString::number(listAddress.count(),10));
    }
}
一个主机名下有多个Ip地址
//获取网络接口相关的信息
void Widget::slotDetail()
{
    QString detail="";
    //提供了一个主机IP地址和网络接口的列表
    QList<QNetworkInterface> list=QNetworkInterface::allInterfaces();
    for(int i = 0;i<list.count();i++)
    {
        QNetworkInterface interface=list.at(i);
        //获取网络接口的硬件地址
        detail=detail+tr("设备")+interface.hardwareAddress()+"\n";
        //每个网络接口包括0个或多个IP地址，每个Ip地址有选择性地与一个子网掩码和一个广播地址相关联
        //入口类存储了被网络接口支持地一个IP地址
        QList<QNetworkAddressEntry> entryList=interface.addressEntries();
        for(int j=0;j<entryList.count();j++)
        {
            QNetworkAddressEntry entry=entryList.at(j);
            detail=detail+"\t"+tr("Ip地址")+entry.ip().toString()+"\n";
            detail=detail+"\t"+tr("子网掩码")+entry.netmask().toString()+"\n";
            detail=detail+"\t"+tr("广播地址")+entry.broadcast().toString()+"\n";

        }
    }
    QMessageBox::information(this,tr("detail"),detail);
}

发送广播

void UdpServer::timeout()
{
	QString msg=TextLineEdit->text();
	int length=0;
	if(msg=="")
	{
		return;
	}
	if((length=udpsocket->writeDatagram(msg.toLatin1(),msg.length(),QHostAddress::Broadcast,post))!=msg.length())
	{
	return;
	}
}
指定向广播地址发送
测试多个网络适配器
#include "widget.h"
#include "ui_widget.h"

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    //获取本机的网络信息
    hostLabel = new QLabel(tr("主机名"));
    lineEditLocalHostName = new QLineEdit;
    ipLabel=new QLabel(tr("Ip地址"));
    LineEditAddress=new QLineEdit;
    detailBtn=new QPushButton(tr("详细"));
    mainLayout=new QGridLayout(this);
    mainLayout->addWidget(hostLabel,0,0);
    mainLayout->addWidget(lineEditLocalHostName,0,1);
    mainLayout->addWidget(ipLabel,1,0);
    mainLayout->addWidget(LineEditAddress,1,1);
    mainLayout->addWidget(detailBtn,2,0,1,2);

    //获取主机信息
    getHostInformation();
    connect(detailBtn,&QPushButton::clicked,this,&Widget::slotDetail);
    m_send = new QUdpSocket(this);
    bool result = m_send->bind(9527,QUdpSocket::ShareAddress|QUdpSocket::ReuseAddressHint);
    if(result)
    {


    QTimer *timer = new QTimer(this);
    connect(timer,&QTimer::timeout,this,[=](){
        QString str=QDateTime::currentDateTime().toString("yyyy/MM/dd/hh/mm/ss/zzzddd");
        ui->label->setText(str);
        QByteArray line;
        line = str.toUtf8();
//        m_send->writeDatagram(line.data(),QHostAddress("127.0.0.1"),5555);
//     m_send->writeDatagram(line.data(),QHostAddress("192.168.6.21"),5555);
//     m_send->writeDatagram(line.data(),QHostAddress("192.168.137.1"),5555);
     m_send->writeDatagram(line.data(),QHostAddress("192.168.1.106"),5555);
    });
    timer->start(1000);
        }
}

Widget::~Widget()
{
    delete ui;
}

void Widget::getHostInformation()
{
    QString localHostName = QHostInfo::localHostName();
    lineEditLocalHostName->setText(localHostName);
    QHostInfo hostInfo = QHostInfo::fromName(localHostName);
    QList<QHostAddress> listAddress=hostInfo.addresses();
    if(!listAddress.isEmpty())
    {
        LineEditAddress->setText(QString::number(listAddress.count(),10));
    }
}
//获取网络接口相关的信息
void Widget::slotDetail()
{
    QString detail="";
    //提供了一个主机IP地址和网络接口的列表
    QList<QNetworkInterface> list=QNetworkInterface::allInterfaces();
    for(int i = 0;i<list.count();i++)
    {
        QNetworkInterface interface=list.at(i);
        //获取网络接口的硬件地址
        detail=detail+tr("设备")+interface.hardwareAddress()+"\n";
        //每个网络接口包括0个或多个IP地址，每个Ip地址有选择性地与一个子网掩码和一个广播地址相关联
        //入口类存储了被网络接口支持地一个IP地址
        QList<QNetworkAddressEntry> entryList=interface.addressEntries();
        for(int j=0;j<entryList.count();j++)
        {
            QNetworkAddressEntry entry=entryList.at(j);
            detail=detail+"\t"+tr("Ip地址")+entry.ip().toString()+"\n";
            detail=detail+"\t"+tr("子网掩码")+entry.netmask().toString()+"\n";
            detail=detail+"\t"+tr("广播地址")+entry.broadcast().toString()+"\n";

        }
    }
    QMessageBox::information(this,tr("detail"),detail);
}

QString 转char*

QString与string相互转换
string s = qstr.toStdString();
QString qstr = QString::fromStdString(s);
1
2
QString与int
QString qstr = QString::number(123);
int i = atoi(qstr.toStdString().c_str());
————————————————
版权声明：本文为优快云博主「泉伟」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.youkuaiyun.com/qq_35451572/article/details/79739300
QString与float
将QString类型转化为float

QString data;            
float num = data.toFloat();
1
2
将float类型转化为QString

QString data = QString("%1").arg(num);
char型数组或字符串指针转换成QString
          char str_data[512];
          QString qs_data;
          qs_data = QString::fromLocal8Bit(str_data,512);   //当然也可以用强制类型转换QString（str_data）
————————————————
版权声明：本文为优快云博主「泉伟」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.youkuaiyun.com/qq_35451572/article/details/79739300
QString类型转换为 char指针类型
          const char * str_data;       //这里一定要加上const，否则会报错！
          QString qs_data;
          str_data = qs_data.ascii();
————————————————
版权声明：本文为优快云博主「泉伟」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.youkuaiyun.com/qq_35451572/article/details/79739300
QString 转QByteArray
QByteArray bytes=str.toUtf8();//toLatin1();
QByteArray和string的转换

字节序

//举例两个字节表示年

目标将获取表示年的字符数组转换为uint16
并将其转序
uint16 i = atoi(qstr.toStdString().c_str());
string sendbuf;
sendbuf.push_back((char)i&0xff);
sendbuf.push_back((char)i>>8&0xff);
//或者直接转换之后
strcat(sendbufDest,netStr);

//消息格式：四个字节长度+四个字节消息ID+消息内容
	while (mLastBuf.size() >= 8)
	{//重点关注数值
		//取出消息长度
		msgLen = mLastBuf[0] |
			mLastBuf[1] << 8 |
			mLastBuf[2] << 16 |
			mLastBuf[3] << 24;
		//取出消息ID
		msgId = mLastBuf[4] |
			mLastBuf[5] << 8 |
			mLastBuf[6] << 16 |
			mLastBuf[7] << 24;
		//完整的包（protobuf规定的消息格式）
	
	//协议格式;4个字节长度+4个字节Id+消息内容
		msgLen = str.size();
		msgId = single->m_MsgType;
		cout << "响应：msgId:" << msgId << endl;
		//4个字节长度
		retBuf->push_back((char)(msgLen & 0xff));
		retBuf->push_back((char)((msgLen >> 8) & 0xff));
		retBuf->push_back((char)((msgLen >> 16) & 0xff));
		retBuf->push_back((char)((msgLen >> 24) & 0xff));
		//4个字节ID
		//都是以首地址偏移（大端法对齐）
		retBuf->push_back((char)(msgId & 0xff));
		retBuf->push_back((char)((msgId >> 8 )& 0xff));
		retBuf->push_back((char)((msgId >> 16) & 0xff));
		retBuf->push_back((char)((msgId >> 24) & 0xff));

实例

成功解析

报文发送方

      message tmp;
        QStringList list=str.split("/");

        tmp.year=atoi(list.at(0).toStdString().c_str());
        std::string arr;
        arr.push_back((char)(tmp.year&0xff));
        arr.push_back((char)((tmp.year>>8)&0xff));
    // m_send->writeDatagram(arr.c_str(),QHostAddress("192.168.1.106"),5555);
        m_send->writeDatagram(QString::number(tmp.year,10).toUtf8(),QHostAddress("192.168.1.106"),5555);

报文接收方

  while (m_sock->hasPendingDatagrams()) {
        QByteArray datagram;
        datagram.resize(m_sock->pendingDatagramSize());
        m_sock->readDatagram(datagram.data(),datagram.size());
        //解析协议
        std::string tmp(datagram.data());
        char buf[3];
        memset(buf,0x00,sizeof(buf));
        strncpy(buf,datagram.data(),2);
//        QString tmp1;
//        tmp=tmp1.prepend(datagram).toStdString();
        quint16 tmp2=(buf[0]|(buf[1]<<8));
        ui->textEdit->append(datagram);
    }

atagram(datagram.data(),datagram.size());
//解析协议
std::string tmp(datagram.data());
char buf[3];
memset(buf,0x00,sizeof(buf));
strncpy(buf,datagram.data(),2);
// QString tmp1;
// tmp=tmp1.prepend(datagram).toStdString();
quint16 tmp2=(buf[0]|(buf[1]<<8));
ui->textEdit->append(datagram);
}
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