qt在windows下的udp通信（最简单）

qt编程:windows下的udp通信

本文博客链接:http://blog.csdn.net/jdh99,作者:jdh,转载请注明.

环境:

主机:win7

开发环境:qt

功能:

用udp进行收发通信

界面:

源代码:

LssHost.pro:

#-------------------------------------------------
#
# Project created by QtCreator 2013-09-22T09:36:44
#
#-------------------------------------------------

QT       += core gui
QT       += network

TARGET = LssHost
TEMPLATE = app


SOURCES += main.cpp
        mainwindow.cpp

HEADERS  += mainwindow.h

FORMS    += mainwindow.ui

mainwindows.h

#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

mainwindows.cpp:

#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);
}

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);
}

main.cpp:

#include <QtGui/QApplication>
#include "mainwindow.h"

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    MainWindow w;
    w.show();

    return a.exec();
}

http://blog.csdn.net/jdh99/article/details/11892725