QUdpSocket进行网络传输

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QUdpSocket>
#include <QMessageBox>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
Q_OBJECT

public:
explicit Widget(QWidget *parent = 0);
~Widget();

private:
Ui::Widget *ui;

private:
QUdpSocket *UdpSocket;

private slots:
void RecvServerMSG();
void on_pushButton_clicked();

private:
QHostAddress senderAddress;
quint16       senderPort;
};

#endif // WIDGET_H

#include "widget.h"
#include "ui_widget.h"

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

UdpSocket = new QUdpSocket(this);
bool conn = UdpSocket->bind(QHostAddress::LocalHost,7755);
if(!conn)
{
QMessageBox box;
box.setText("链接错误 ");
box.exec();
}
else
{
connect(UdpSocket, SIGNAL(readyRead()), this, SLOT(RecvServerMSG()));
}
}

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

void Widget::RecvServerMSG()
{
while(UdpSocket->hasPendingDatagrams()) //is read data
{
QByteArray data;
data.resize(UdpSocket->pendingDatagramSize());
UdpSocket->readDatagram(data.data(), data.size(), &senderAddress, &senderPort); //read data
QString strText = QString(data);
ui->textEdit->insertPlainText(strText + "\r\n");
}
}

void Widget::on_pushButton_clicked()
{

QMessageBox box;
QString strSendText = ui->textEdit->toPlainText();
QByteArray datagram = strSendText.toUtf8();
if(strSendText.length() == 0)
{
box.setText("Please Input text to send!");
}
int retLen = UdpSocket->writeDatagram(datagram.data(),datagram.size(), senderAddress, senderPort);
if(retLen)
{
box.setText("send success!");
}
box.exec();

}

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QUdpSocket>
#include <QMessageBox>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
Q_OBJECT

public:
explicit Widget(QWidget *parent = 0);
~Widget();

private:
Ui::Widget *ui;

private:
QUdpSocket *UdpSocket;

private slots:
void SendToClient();
void RecvServerMSG();
};

#endif // WIDGET_H

#include "widget.h"
#include "ui_widget.h"

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

UdpSocket = new QUdpSocket(this);

connect(ui->pushButton, SIGNAL(clicked()), this, SLOT(SendToClient()));
connect(UdpSocket, SIGNAL(readyRead()), this, SLOT(RecvServerMSG()));

}

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

void Widget::RecvServerMSG()
{
while(UdpSocket->hasPendingDatagrams()) //is read data
{
QByteArray data;
data.resize(UdpSocket->pendingDatagramSize());
UdpSocket->readDatagram(data.data(), data.size()); //read data
QString strText = QString(data);
ui->textEdit->insertPlainText(strText + "\r\n");
}
}

void Widget::SendToClient()
{
QMessageBox box;
QString strSendText = ui->textEdit->toPlainText();
QByteArray datagram = strSendText.toUtf8();
if(strSendText.length() == 0)
{
box.setText("Please Input text to send!");
}
int retLen = UdpSocket->writeDatagram(datagram.data(), datagram.size(), QHostAddress::LocalHost, 7755);
if(retLen)
{
box.setText("send success!");
}
box.exec();

}