对qt代码的 udp广播学习
简单学习在qt下 UDP广告的代码
#include "mainwindow.h"
#include "ui_mainwindow.h"
//引用文件必须
#include "QtNetwork/qudpsocket.h"
#include "QtNetwork/qhostaddress.h"
QUdpSocket *receiver; //接收端的
QUdpSocket *clinet; //发送端
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
clinet =new QUdpSocket(this);
receiver = new QUdpSocket(this);
//初始化
receiver->bind(2425,QUdpSocket::ShareAddress); //接收端必须处于邦定状态（QUdpSocket::ShareAddress）
connect(receiver, SIGNAL(readyRead()),this, SLOT(readPendingDatagrams())); //建立信号 readyread引发readPendingDatagrams
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::readPendingDatagrams()
{
qDebug("---------进入收信息----------");
//检测是不是有信息到来
while (receiver->hasPendingDatagrams()) {
QByteArray datagram;
datagram.resize(receiver->pendingDatagramSize()); //获取信息长度
receiver->readDatagram(datagram.data(), datagram.size()); //读到缓冲
ui->plainTextEdit->setPlainText(ui->plainTextEdit->document()->toPlainText()+datagram.data());
}
}
void MainWindow::on_pushButton_clicked()
{
QByteArray str="hi my fukun\n";
clinet->writeDatagram(str.data(),str.size(),QHostAddress::Broadcast,2425); //发送端发送数据发送不需要邦定
}除了上面的内容，在编译时记得在pro文件中加上
QT += network
最终效果如下。
