Qt套接字实现UDP通信

环境:主机:win10开发环境:Qt
功能:用udp进行收发通信
界面:


源代码:1 UDPsocket.pro文件:

#-------------------------------------------------

#

# Project created by QtCreator 2018-03-21T11:13:28

#

#-------------------------------------------------

QT       += core gui

QT       += network

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = UDPsocket

TEMPLATE = app

# The following define makes your compiler emit warnings if you use

# any feature of Qt which as been marked as 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 you use 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\

mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include <QtNetwork/QUdpSocket>

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

Q_OBJECT

public:

explicit MainWindow(QWidget *parent = 0);

~MainWindow();

private:

Ui::MainWindow *ui;

QUdpSocket *udp_socket_tx;

QUdpSocket *udp_socket_rx;

QHostAddress Ip_Tx;

int Port_Tx;

private slots:

void on_btn_cfg_clicked();

void on_btn_tx_clicked();

void rx_udp();

};

#endif // MAINWINDOW_H

2 MainWindow.h文件：

#ifndef MAINWINDOW_H

#define MAINWINDOW_H

#include <QMainWindow>

#include <QtNetwork/QUdpSocket>

namespace Ui {

class MainWindow;

}

class MainWindow : public QMainWindow

{

Q_OBJECT

public:

explicit MainWindow(QWidget *parent = 0);

~MainWindow();

private:

Ui::MainWindow *ui;

QUdpSocket *udp_socket_tx;

QUdpSocket *udp_socket_rx;

QHostAddress Ip_Tx;

int Port_Tx;

private slots:

void on_btn_cfg_clicked();

void on_btn_tx_clicked();

void rx_udp();

};

#endif // MAINWINDOW_H

3 MainWindow.cpp文件：

#include "mainwindow.h"

#include "ui_mainwindow.h"

MainWindow::MainWindow(QWidget *parent) :

QMainWindow(parent),

ui(new Ui::MainWindow)

{

ui->setupUi(this);

udp_socket_tx = new QUdpSocket(this);

udp_socket_rx = new QUdpSocket(this);

ui->btn_tx->setEnabled(false);

ui->txt_ip->setText("172.16.7.61");

}

MainWindow::~MainWindow()

{

delete ui;

}

//接收udp数据

void MainWindow::rx_udp()

{

qDebug() << "rx";

while (udp_socket_rx->hasPendingDatagrams())

{

QByteArray datagram;

datagram.resize(udp_socket_rx->pendingDatagramSize());

QHostAddress sender;

quint16 senderPort;

udp_socket_rx->readDatagram(datagram.data(), datagram.size(),

&sender, &senderPort);

ui->txt_rx->append(datagram);

}

}

//发送按键

void MainWindow::on_btn_tx_clicked()

{

QByteArray datagram = ui->txt_tx->toPlainText().toAscii();

udp_socket_tx->writeDatagram(datagram, datagram.size(), Ip_Tx, Port_Tx);

}

//配置按键

void MainWindow::on_btn_cfg_clicked()

{

bool ok;

int port_rx = 0;

//获得发送IP和端口

Ip_Tx = QHostAddress(ui->txt_ip->text());

Port_Tx = ui->txt_port_tx->text().toInt(&ok);

//获得接收端口

port_rx = ui->txt_port_rx->text().toInt(&ok);

udp_socket_rx->bind(QHostAddress::Any, port_rx);

//绑定接收信号槽

connect(udp_socket_rx, SIGNAL(readyRead()),this, SLOT(rx_udp()));

ui->btn_tx->setEnabled(true);

}

4 Main.cpp文件：

#include "mainwindow.h"

#include <QApplication>

int main(int argc, char *argv[])

{

QApplication a(argc, argv);

MainWindow w;

w.show();

return a.exec();

}

效果:



到这里，实现了UDP双向通信功能。