QT的UDP通信

一、.pro文件

QT       += core gui network

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

CONFIG += c++11

# The following define makes your compiler emit warnings if you use
# any Qt feature that has been marked deprecated (the exact warnings
# depend on your compiler). Please consult the documentation of the
# deprecated API in order to know how to port your code away from it.
DEFINES += QT_DEPRECATED_WARNINGS

# You can also make your code fail to compile if it uses deprecated APIs.
# In order to do so, uncomment the following line.
# You can also select to disable deprecated APIs only up to a certain version of Qt.
#DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000    # disables all the APIs deprecated before Qt 6.0.0

SOURCES += \
    main.cpp \
    server.cpp

HEADERS += \
    server.h

FORMS += \
    server.ui

# Default rules for deployment.
qnx: target.path = /tmp/$${TARGET}/bin
else: unix:!android: target.path = /opt/$${TARGET}/bin
!isEmpty(target.path): INSTALLS += target

二、.h文件

#ifndef SERVER_H
#define SERVER_H

#include <QWidget>
#include <QUdpSocket>
#include <QByteArray>
#include <QHostAddress>
#include <QString>
#include <QDebug>

QT_BEGIN_NAMESPACE
namespace Ui { class Server; }
QT_END_NAMESPACE

class Server : public QWidget
{
    Q_OBJECT

public:
    Server(QWidget *parent = nullptr);
    ~Server();

    QUdpSocket* serverSocket;

private:
    Ui::Server *ui;
};
#endif // SERVER_H

三、.cpp文件

#include "server.h"
#include "ui_server.h"

QString clientIP = "192.xxx.xxx.xxx";   //此处为IP地址
QString clientPort  = "8888";
QString serverPort = "9999";

Server::Server(QWidget *parent): QWidget(parent), ui(new Ui::Server)
{
    ui->setupUi(this);

    ui->lineEdit->setText(clientIP);
    ui->lineEdit_2->setText(clientPort);
    ui->lineEdit_3->setText(serverPort);

    serverSocket = new QUdpSocket(this);

    //服务器接收信息
    serverSocket->bind(serverPort.toInt());         //绑定服务器接收端口"9999"
    connect(serverSocket,&QUdpSocket::readyRead,this,[=](){
        qint64 size = serverSocket->pendingDatagramSize();
        QByteArray array(size,0);
        serverSocket->readDatagram(array.data(),size);
        ui->textEdit_2->append(array);
    });
    //服务器发送信息
    connect(ui->pushButton,&QPushButton::clicked,this,[=](){
        serverSocket->writeDatagram(ui->textEdit->toPlainText().toUtf8(),QHostAddress(clientIP),clientPort.toInt());
    });
}

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

四、.ui文件