带有QList的C++多客户端TCP服务器

C++ Multi-Client TCP Server with QList

本文关键字：客户端 TCP 服务器 C++ QList 带有      更新时间：2023-10-16

必要信息：

  QList<QTcpSocket*> list;
  QTcpServer* server;
  QTcpSocket* socket;

在Qt中，我构建了一个TCP服务器（QTcpServer）！我与所有连接的客户端都有一个QList，我想亲自读取每个客户端的通信数据。因此，如果QTcpServer获得新连接，我会这样处理：

void Server::newConnection()
{
   qDebug() << "New Connection";
   list.append(server->nextPendingConnection());
   connect(list.last(),SIGNAL(readyRead()),this,SLOT(readyRead()));
}

如何在我的SLOTreadyRead()中获得发送SIGNALreadyRead()的正确客户端（来自我的QList）？

void Server::readyRead(){
       //??
}

欢迎任何帮助！

您尝试过QObject:：sender（）吗？它应该返回实际发送信号的QObject的实例。希望这会有所帮助。

解决方案：

void Server::readyRead(){
    QByteArray buffer;
    QTcpSocket* readSocket = qobject_cast<QTcpSocket*>(sender());
    buffer = readSocket->readAll();
    QString mytext = QString::fromStdString(buffer);
    qDebug() << mytext;
}

这可以通过QSignalMapper解决。以下是（未完全测试）代码：

----------------------main.cpp------------------

#include "rootwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    RootWindow w;
    w.show();
    return a.exec();
}

----------------------根窗口.h-----------------------

#ifndef ROOTWINDOW_H
#define ROOTWINDOW_H
#include <QMainWindow>
#include <QtDebug>
#include <QLocalServer>
#include <QLocalSocket>
#include <QSignalMapper>
#include <QList>
class RootWindow : public QMainWindow
{
    Q_OBJECT
private:
    QLocalServer *server;
    QLocalSocket *socket;
    QList<QLocalSocket*> *list;
    QSignalMapper *mapper;
public:
    RootWindow(QWidget *parent = 0);
    ~RootWindow();
private slots:
    void slotNewConnection();
    void slotReadyRead(int index);
};
#endif // ROOTWINDOW_H

------------------------rootwindow.cpp-----------------------

#include "rootwindow.h"
RootWindow::RootWindow(QWidget *parent): QMainWindow(parent)
{
    server = new QLocalServer;
    list = new QList<QLocalSocket*>;
    mapper = new QSignalMapper(this);
    connect(server, SIGNAL(newConnection()), this, SLOT(slotNewConnection()));
    connect(mapper, SIGNAL(mapped(int)), this, SLOT(slotReadyRead(int)));
    server->listen("TestServer");
}
RootWindow::~RootWindow()
{
    delete list;
}
void RootWindow::slotNewConnection()
{
    qWarning() << "newConnection";
    list->append(server->nextPendingConnection());
    //here you map each client to its number in the list
    mapper->setMapping(list->last(), list->length()-1);
    //here we say, that when ever a client from the QList sends readyRead() the mapper should be used
    //with the property (list->length()-1) defined in the line above
    connect(list->last(), SIGNAL(readyRead()), mapper, SLOT(map()));
}
void RootWindow::slotReadyRead(int index)
{
    qWarning() << "Client " << index << " has written: " << list->at(index)->readAll();
}

这基本上是您的代码，我只在相关行添加了QSignalMapper和一些注释。

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