Qt之局域网UDP通讯

创建两个QUdpSocket对象，一个用来发送数据，一个用来接收数据。发送数据的QUdpSocket需要绑定本机IP和端口，要不然是收不到数据的。

界面最上面的IP输入框是发送到的对方IP地址。中间是显示收到数据。下面的输入框是用来发送数据的。

在虚拟机中和本机通讯：



Qt没有IP输入框，需要自己去封装，也可以网上下载。我前面也发了一个自己封装的IP输入框，功能大部分和Windows IP输入框差不多，个别地方需要微修改一下。

主要程序：

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QtNetwork>
#include <QLineEdit>
#include <QPushButton>

class CIPLineEdit;
namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();

private:
Ui::MainWindow *ui;

CIPLineEdit *m_pIPLineEdit;

QUdpSocket *m_rcvSocket;
QUdpSocket *m_sendSocket;
private slots:
void send();
void receive();
};

#endif // MAINWINDOW_H

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QtNetwork>
#include <QTextCodec>
#include "iplineedit.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
MainWindow::setWindowTitle(tr("UDP"));

m_pIPLineEdit = new CIPLineEdit(this);
m_pIPLineEdit->setGeometry(45, 25, 120, 26);
m_rcvSocket = new QUdpSocket(this);
ui->label_IP->setText("ToIP");
QString ipAddress;
QList<QHostAddress> ipAddressesList = QNetworkInterface::allAddresses();
for (int i = 0; i < ipAddressesList.size(); ++i)
{
if (ipAddressesList.at(i) != QHostAddress::LocalHost &&	ipAddressesList.at(i).toIPv4Address())
{
ipAddress = ipAddressesList.at(i).toString();
break;
}
}
bool conn = m_rcvSocket->bind(QHostAddress(ipAddress), 6660, QUdpSocket::ShareAddress);
if (!conn)
conn = m_rcvSocket->bind(QHostAddress("127.0.0.1"), 6660, QUdpSocket::ShareAddress);

if (conn)
{
connect(ui->send, SIGNAL(clicked()), this, SLOT(send()));
connect(m_rcvSocket, SIGNAL(readyRead()), this, SLOT(receive()));
}

m_sendSocket = new QUdpSocket(this);
}

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

//发送消息
void MainWindow::send()
{
QString qs = ui->textSend->toPlainText();
QTextCodec *codec = QTextCodec::codecForName("GB2312");
QByteArray byte = codec->fromUnicode(qs);
if (qs.isEmpty())
return;
m_sendSocket->writeDatagram(byte.data(), byte.length(), QHostAddress(m_pIPLineEdit->GetIP()), 6660);
ui->textSend->clear();
}

//接收消息并显示
void MainWindow::receive()
{
QHostAddress addr;
quint16 port;

while(m_rcvSocket->hasPendingDatagrams())
{
QByteArray qb;
qb.resize(m_rcvSocket->pendingDatagramSize());
m_rcvSocket->readDatagram(qb.data(), qb.size(), &addr, &port);
QTextCodec *codec = QTextCodec::codecForName("GB2312");
QString str = codec->toUnicode(qb);
QString qStrIP = addr.toString();

if (qb.size())
{
ui->textReceive->append(qStrIP + " said:\n");
ui->textReceive->insertPlainText(str);
}
}
}

qq：1245178753

本文地址：http://blog.csdn.net/u011417605/article/details/52515562
源码下载：http://download.csdn.net/detail/u011417605/9628682