Qt网络编程基础——UDP简易通讯_udpserver->writedatagram(ui->udptextedit->toplaint

首先展示UDP通信中的流程：

一、具体代码展示

1、两端通信只需要通信两端同时使用<QUdpSocket>内提供的socket进行通信即可，无服务器和客户端之分

头文件：

#ifndef UDPSERVER_H
#define UDPSERVER_H
 
#include <QWidget>
#include <QUdpSocket>
 
namespace Ui {
class UdpServer;
}
 
class UdpServer : public QWidget
{
    Q_OBJECT
 
public:
    explicit UdpServer(QWidget *parent = 0);
    ~UdpServer();
 
private slots:
 
    void on_pb_send_clicked();
 
    void on_pushButton_3_clicked();
 
    void dealSomething();
 
private:
    Ui::UdpServer *ui;
    QUdpSocket *udpSocket;
};
 
#endif // UDPSERVER_H

具体实现：

#include "udpserver.h"
#include "ui_udpserver.h"
 
#include <QString>
#include <QByteArray>
 
UdpServer::UdpServer(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::UdpServer)
{
    ui->setupUi(this);
 
    //显示为通信套接字开辟空间，并指定父对象
    udpSocket = new QUdpSocket(this);
 
    setWindowTitle("服务器端口: 8888");
 
    udpSocket->bind(8888);
 
    //当对方成功把数据发送过来
    connect(udpSocket, SIGNAL(readyRead()),
            this, SLOT(dealSomething()));
 
}
 
UdpServer::~UdpServer()
{
    delete ui;
}
 
void UdpServer::on_pb_send_clicked()
{
    QString str = ui->te_write->toPlainText();
    QString ip = ui->le_ip->text();
    quint16 port = ui->le_port->text().toInt();
    udpSocket->writeDatagram(str.toUtf8(), QHostAddress(ip), port);
}
 
void UdpServer::on_pushButton_3_clicked()
{
 
}
 
 
void UdpServer::dealSomething()
{
    //接受信息
    char buff[1024] = {0};
    QHostAddress add;
    quint16 port;
    qint64 len = udpSocket->readDatagram(buff, sizeof(buff),
                     &add, &port);
    if(len > 0)
    {
        QString str = QString("[%1:%2] %3").arg(add.toString()).arg(port).arg(buff);
 
        ui->te_read->setText(str);
    }
}

二、效果展示：