qt-udp协议编程

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作者：使徒保罗

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应用场景: qt udp通信

开发环境: windows10 64位+qt5.7(mingw).exe

注意：

本文有服务器端和客户端程序代码组成，各位同学可以先跑服务器程序，然后跑客户端程序就可以看到通信效果了.

udp client：

pro文件增加network模块：

QT += core network

udpclient.h:

#ifndef UDPCLIENT_H

#define UDPCLIENT_H

#include <QUdpSocket>

class UdpClient : public QObject

    Q_OBJECT

public:

    explicit UdpClient(QObject *parent = 0);

    ~UdpClient();

    void setPort(quint16 nPort);

    void setIPAndPort(QString strIP, quint16 nPort);

    qint64 SendData(const char *data, qint64 size);

    qint64 SendData(const QByteArray &datagram);

signals:

public slots:

    void slotOnSocketErr();

private:

    quint16 m_nTargetPort;

    QHostAddress m_targetHostAddress;

    QUdpSocket* m_pUdpSocket;

};

#endif // UDPCLIENT_H

udpclient.cpp

#include "udpclient.h"

UdpClient::UdpClient(QObject *parent) : QObject(parent)

    m_pUdpSocket = new QUdpSocket(this);

    connect(m_pUdpSocket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(slotOnSocketErr()));

UdpClient::~UdpClient()

    if(m_pUdpSocket)

        m_pUdpSocket->deleteLater();

void UdpClient::setPort(quint16 nPort)

    m_nTargetPort = nPort;

void UdpClient::setIPAndPort(QString strIP, quint16 nPort)

    m_targetHostAddress.setAddress(strIP);

    m_nTargetPort = nPort;

/*

 * @return: Returns the number of bytes sent on success; otherwise returns -1

*/

qint64 UdpClient::SendData(const char *data, qint64 size)

    qint16 nRet = -1;

    if(data == NULL || size <= 0)

        return nRet;

    nRet = m_pUdpSocket->writeDatagram(data, size, m_targetHostAddress, m_nTargetPort);

    return nRet;

/*

 * @return: Returns the number of bytes sent on success; otherwise returns -1

*/

qint64 UdpClient::SendData(const QByteArray &datagram)

    qint16 nRet = -1;

    if(datagram.size() <= 0)

        return nRet;

    nRet = m_pUdpSocket->writeDatagram(datagram, m_targetHostAddress, m_nTargetPort);

    return nRet;

void UdpClient::slotOnSocketErr()

    qDebug("socket err: %s errcode=%d", m_pUdpSocket->errorString().toStdString().c_str(), m_pUdpSocket->error());

udpclient main.cpp

#include <QCoreApplication>

#include <udpclient.h>

#include <QDebug>

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

    QCoreApplication a(argc, argv);

    UdpClient client;

    client.setIPAndPort("127.0.0.1", 6000);

    char szMsg[] = "Hello world!";

    qint16 nBytes = client.SendData(szMsg, sizeof(szMsg));

    if(-1 == nBytes)

        qDebug("send failed.\n");

    else

        qDebug("send success. bytes size = %d\n", nBytes);

    return a.exec();

udpserver ：

pro增加network模块

QT += core network

udpserver.h

#ifndef UDPSERVER_H

#define UDPSERVER_H

#include <QUdpSocket>

class UdpServer : public QObject

    Q_OBJECT

public:

    explicit UdpServer(quint16 nPort, QObject *parent = 0);

signals:

public slots:

    void slotOnSocketErr();

    void slotReadPendingDatagrams();

private:

    QUdpSocket* m_pUdpSocket;

};

#endif // UDPSERVER_H

udpserver.cpp

#include "udpserver.h"

UdpServer::UdpServer(quint16 nPort, QObject *parent) : QObject(parent)

    m_pUdpSocket = new QUdpSocket(this);

    QHostAddress hostAddress = m_pUdpSocket->localAddress();

    if(!m_pUdpSocket->bind(hostAddress, nPort))

        qDebug("udp server bind port failed.");

    connect(m_pUdpSocket, SIGNAL(error(QAbstractSocket::SocketError)), this, SLOT(slotOnSocketErr()));

    connect(m_pUdpSocket, SIGNAL(readyRead()),this, SLOT(slotReadPendingDatagrams()));

void UdpServer::slotOnSocketErr()

    qDebug("socket err: %s errcode=%d", m_pUdpSocket->errorString().toStdString().c_str(), m_pUdpSocket->error());

void UdpServer::slotReadPendingDatagrams()

    while (m_pUdpSocket->hasPendingDatagrams()) {

        QHostAddress senderIp;

        quint16 senderPort;

        QByteArray datagram;

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

        if (m_pUdpSocket->readDatagram(datagram.data(), datagram.size(),

                                         &senderIp, &senderPort) == -1)

             continue;

        qDebug("recv data: %s len=%d\n",datagram.data(), datagram.size());

udpserver mian.cpp

#include <QCoreApplication>

#include "udpserver.h"

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

    QCoreApplication a(argc, argv);

    UdpServer server(6000);

    return a.exec();

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