如何使用套接字编程获取系统日期和时间

Question

我在这里从客户端向服务器发送简单消息并且工作正常，但是如果客户端想要获取服务器系统日期和时间怎么办。

Client

mainwindow.cpp

Client::Client(QObject* parent): QObject(parent)
{
    connect(&client, SIGNAL(connected()),
    this, SLOT(startTransfer()));
}

Client::~Client()
{
    client.close();
}

void Client::start(QString address, quint16 port)
{
    QHostAddress addr(address);
    client.connectToHost(addr, port);
}

void Client::startTransfer()
{
    client.write("Hi server this is client", 80);
}

我不知道该怎么做，因为我是 QT c++ 的新手。非常感谢你...

server

main.cpp

    #include "mainwindow.h"
  #include <QApplication>



  int main(int argc, char** argv)
  {
    QApplication app(argc, argv);
    Server server;
    return app.exec();
  }

Answer 1

无法从客户端获取服务器系统date/time。

您必须将其作为数据包发送。

void Client::startTransfer()
{
    QDateTime dateTime = dateTime.currentDateTime(); 
    QString dateTimeString = dateTime.toString("yyyy-MM-dd_hh-mm-ss");
    // send "dateTimeString" here
}

Answer 2

我认为你发布的这部分代码是客户端，你应该像普通握手一样提供从客户端到服务器的请求。

在服务器端，您以客户端可以识别并发送的特定格式提供 date/time。看起来更多关于 client/server 编程检查 Local Fortune Client and Local Fortune Server 示例。

这是您的客户端简单示例：

void Client::startTransfer()
{
    client.write("Hi server send time");
    client.flush();
    client.waitForBytesWritten(300);
}

还有你的服务器端示例：

on newconnection 服务器中的插槽将客户端数据连接到客户端消息等插槽。

void ServerSocket::newConnection()
{
    QTcpSocket *clientsocket = mserver->nextPendingConnection();
    connect(clientsocket , SIGNAL(readyRead()) , this , SLOT(clientMessage()));
}

并在插槽客户端消息中响应

void ServerSocket::clientMessage()
{
    QTcpSocket* client = (QTcpSocket*)sender();
    QString  message(client->readAll());
    if (message == "Hi server send time")
    {
        client->write(QDateTime::currentDateTimeUtc().toString().toLatin1());
        client->flush();
        client->waitForBytesWritten(300);
    }
}

这是请求的完整代码：

servesocket.h

#ifndef SERVERSOCKET_H
#define SERVERSOCKET_H

#include <QObject>
#include <QDebug>
#include <QTcpServer>
#include <QTcpSocket>

class ServerSocket : public QObject
{
    Q_OBJECT
public:
    explicit ServerSocket(QObject *parent = nullptr);
    QTcpServer *mserver;

signals:

public slots:

    void newConnection();
    void clientMessage();

};

#endif // SERVERSOCKET_H

serversocket.cpp

#include "serversocket.h"
#include <QDateTime>

ServerSocket::ServerSocket(QObject *parent) : QObject(parent)
{
    mserver = new QTcpServer(this);
    mserver->connect(mserver , SIGNAL(newConnection()) , this , SLOT(newConnection()));
    if(!mserver->listen(QHostAddress::Any , 1234))
    {
        qDebug() << "Server initilize failed";
    }
}

void ServerSocket::newConnection()
{
    QTcpSocket *clientsocket = mserver->nextPendingConnection();
    connect(clientsocket , SIGNAL(readyRead()) , this , SLOT(clientMessage()));
}

void ServerSocket::clientMessage()
{
    QTcpSocket* client = (QTcpSocket*)sender();
    QString  message(client->readAll());
    if (message == "Hi server send time")
    {
        client->write(QDateTime::currentDateTimeUtc().toString().toLatin1());
        client->flush();
        client->waitForBytesWritten(300);
    }
}

MainWindow header

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QLineEdit>
#include <QMainWindow>
#include <QSerialPort>

#include "serversocket.h"

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);//:QMainWindow(parent)
    ~MainWindow();

private slots:



private:
    Ui::MainWindow *ui;
    ServerSocket * server;

};

#endif // MAINWINDOW_H

MainWindow cpp

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    server = new ServerSocket();
}

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

如何使用套接字编程获取系统日期和时间

How to get the system date and time using socket programming

c++

qt

qt4