目录

 

简介

源码

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简介

本篇博文修改于：

 

Qt文档阅读笔记-QUdpSocket基本表述及简单实现

https://blog.csdn.net/qq78442761/article/details/85258574

 

原理请看上面的博文

 

获取源IP地址的原理：

在槽函数中进行获取，记住这种逻辑，很重要，因为Socket里面有个函数叫peerAddr这个不会获取任何东西！

关键源码如下：

QHostAddress srcAddress;quint16 nSrcPort;QByteArray datagram;datagram.resize(m_udpSocket->pendingDatagramSize());m_udpSocket->readDatagram(datagram.data(), datagram.size(), &srcAddress, &nSrcPort);;

程序运行截图如下：

源码

widget.h

#ifndef WIDGET_H #define WIDGET_H#include <QWidget>QT_BEGIN_NAMESPACE class QUdpSocket; QT_END_NAMESPACEnamespace Ui { class Widget; }class Widget : public QWidget {Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();protected slots:void readPendingDatagrams();private:Ui::Widget *ui;QUdpSocket *m_udpSocket; };#endif // WIDGET_H

main.cpp

#include "widget.h" #include <QApplication>int main(int argc, char *argv[]) {QApplication a(argc, argv);Widget w;w.show();return a.exec(); }

widget.cpp

#include "widget.h" #include "ui_widget.h" #include <QUdpSocket> #include <QNetworkDatagram> #include <QHostAddress> #include <QDebug>Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget) {ui->setupUi(this);this->setWindowTitle("接收端");m_udpSocket = new QUdpSocket(this);if(!m_udpSocket->bind(7755)){qDebug() << "bind failed! The assert will be triggred!";Q_ASSERT(!"bind faile!");}connect(m_udpSocket, SIGNAL(readyRead()), this, SLOT(readPendingDatagrams())); }Widget::~Widget() {delete ui; }void Widget::readPendingDatagrams() {qDebug() << "readPendingDatagrams called!";while(m_udpSocket->hasPendingDatagrams()){QHostAddress srcAddress;quint16 nSrcPort;QByteArray datagram;datagram.resize(m_udpSocket->pendingDatagramSize());m_udpSocket->readDatagram(datagram.data(), datagram.size(), &srcAddress, &nSrcPort);;QString firstData = srcAddress.toString() + " " + QString::number(nSrcPort) + " :";ui->textEdit->append(firstData + datagram);} }

 

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