qt中的udp编程

UDP
QUdpSocket ---> upd socket

1.创建
QUdpSocket *p = new QUdpSocket();

2.最先接收数据一方调用bind-> ip/port
bool QAbstractSocket::bind(const QHostAddress & address, quint16 port = 0, BindMode mode = DefaultForPlatform)
p->bind();

connect( ,SIGNAL(readyRead()),,SLOT(r));
3.接收数据
当 QUdpSocket 对象收到别一方发来的数据会发出信号 readyRead()
qint64 QUdpSocket::readDatagram(char * data, qint64 maxSize, QHostAddress * address = 0, quint16 * port = 0)
r()
{
p->readDatagram();

}
4.发数据
qint64 QUdpSocket::writeDatagram(const char * data, qint64 size, const QHostAddress & address, quint16 port)
p->writeDatagram();

recv.h

#ifndef DIALOG_H

#define DIALOG_H

#include <QDialog>

#include<QHostAddress>

#include<QUdpSocket>

#include<QByteArray>

namespace Ui {

class Dialog;

}

class Dialog : public QDialog

{

    Q_OBJECT

public:

    explicit Dialog(QWidget *parent = );

    ~Dialog();

private slots:

    void on_pushButton_clicked();

    void getmsg();

    void on_pushButton_2_clicked();

private:

    Ui::Dialog *ui;

    QUdpSocket *up;

    QHostAddress *host;

    quint16 port,port1;

};

#endif // DIALOG_H

recv.cpp

#include "dialog.h"

#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :

    QDialog(parent),

    ui(new Ui::Dialog)

{

    ui->setupUi(this);

up = new QUdpSocket(this);

    port = ;

}

Dialog::~Dialog()

{

    delete ui;

}

void Dialog::on_pushButton_clicked()

{

 up->bind(QHostAddress("192.168.1.30"),);

connect(up,SIGNAL(readyRead()),this,SLOT(getmsg()));

}

void Dialog::getmsg()

{//qDebug()<<host<<port;

    QByteArray buf;

  buf.resize(up->pendingDatagramSize());

    QHostAddress host1;

   // quint16 port1;

//qDebug()<<host<<port;

    up->readDatagram(buf.data(),buf.size(),&host1,&port1);

   // qDebug()<<buf.data();

    QString tmp(buf.data());

    ui->listWidget->addItem(tmp);

}

void Dialog::on_pushButton_2_clicked()

{//qDebug()<<host<<port;

host = new QHostAddress("192.168.1.30");

    QString tmp = ui->lineEdit->text();

    qDebug()<<tmp;

up->writeDatagram(tmp.toLatin1(),tmp.size(),*host,port1);

//qDebug()<<host<<port;

}

ui

/********************************************************************************

** Form generated from reading UI file 'dialog.ui'

**

** Created by: Qt User Interface Compiler version 5.5.0

**

** WARNING! All changes made in this file will be lost when recompiling UI file!

********************************************************************************/

#ifndef UI_DIALOG_H

#define UI_DIALOG_H

#include <QtCore/QVariant>

#include <QtWidgets/QAction>

#include <QtWidgets/QApplication>

#include <QtWidgets/QButtonGroup>

#include <QtWidgets/QDialog>

#include <QtWidgets/QHeaderView>

#include <QtWidgets/QLabel>

#include <QtWidgets/QLineEdit>

#include <QtWidgets/QListWidget>

#include <QtWidgets/QPushButton>

QT_BEGIN_NAMESPACE

class Ui_Dialog

{

public:

    QPushButton *pushButton;

    QPushButton *pushButton_2;

    QListWidget *listWidget;

    QLabel *label;

    QLineEdit *lineEdit;

    void setupUi(QDialog *Dialog)

    {

        if (Dialog->objectName().isEmpty())

            Dialog->setObjectName(QStringLiteral("Dialog"));

        Dialog->resize(, );

        pushButton = new QPushButton(Dialog);

        pushButton->setObjectName(QStringLiteral("pushButton"));

        pushButton->setGeometry(QRect(, , , ));

        pushButton_2 = new QPushButton(Dialog);

        pushButton_2->setObjectName(QStringLiteral("pushButton_2"));

        pushButton_2->setGeometry(QRect(, , , ));

        listWidget = new QListWidget(Dialog);

        listWidget->setObjectName(QStringLiteral("listWidget"));

        listWidget->setGeometry(QRect(, , , ));

        label = new QLabel(Dialog);

        label->setObjectName(QStringLiteral("label"));

        label->setGeometry(QRect(, , , ));

        lineEdit = new QLineEdit(Dialog);

        lineEdit->setObjectName(QStringLiteral("lineEdit"));

        lineEdit->setGeometry(QRect(, , , ));

        retranslateUi(Dialog);

        QMetaObject::connectSlotsByName(Dialog);

    } // setupUi

    void retranslateUi(QDialog *Dialog)

    {

        Dialog->setWindowTitle(QApplication::translate("Dialog", "Dialog", ));

        pushButton->setText(QApplication::translate("Dialog", "bind", ));

        pushButton_2->setText(QApplication::translate("Dialog", "send", ));

        label->setText(QApplication::translate("Dialog", "recv", ));

    } // retranslateUi

};

namespace Ui {

    class Dialog: public Ui_Dialog {};

} // namespace Ui

QT_END_NAMESPACE

#endif // UI_DIALOG_H

send.h

#ifndef DIALOG_H

#define DIALOG_H

#include <QDialog>

#include<QDebug>

#include<QUdpSocket>

#include<QHostAddress>

#include<QByteArray>

namespace Ui {

class Dialog;

}

class Dialog : public QDialog

{

    Q_OBJECT

public:

    explicit Dialog(QWidget *parent = );

    ~Dialog();

private slots:

    void on_pushButton_clicked();

    void getmsg();

private:

    Ui::Dialog *ui;

    QUdpSocket *up;

    QHostAddress *host,host1;

    quint16 port,port1;

};

#endif // DIALOG_H

send.cpp

#include "dialog.h"

#include "ui_dialog.h"

Dialog::Dialog(QWidget *parent) :

    QDialog(parent),

    ui(new Ui::Dialog)

{

    ui->setupUi(this);

  //  up = new QUdpSocket;

port = ;

host = new QHostAddress("192.168.1.30");

 up = new QUdpSocket();

}

Dialog::~Dialog()

{

    delete ui;

}

void Dialog::on_pushButton_clicked()

{

    QString tmp = ui->lineEdit->text();

qDebug()<<tmp;

    up->writeDatagram(tmp.toLatin1(),*host,port);

connect(up,SIGNAL(readyRead()),this,SLOT(getmsg()));

}

void Dialog::getmsg()

{

    QByteArray buf;

    buf.resize(up->pendingDatagramSize());

    QHostAddress host1;

    quint16 port1;

    up->readDatagram(buf.data(),buf.size(),&host1,&port1);

    //qDebug()<<buf.data();

    QString tmp(buf.data());

    ui->listWidget->addItem(tmp);

}

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